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config.json

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+{
+  "architectures": [
+    "IQuestLoopCoderForCausalLM"
+  ],
+  "attention_bias": false,
+  "attention_dropout": 0.0,
+  "auto_map": {
+    "AutoConfig": "configuration_iquestloopcoder.IQuestLoopCoderConfig",
+    "AutoModel": "modeling_iquestloopcoder.IQuestLoopCoderModel",
+    "AutoModelForCausalLM": "modeling_iquestloopcoder.IQuestLoopCoderForCausalLM"
+  },
+  "bos_token_id": 1,
+  "dtype": "bfloat16",
+  "eos_token_id": [
+    75864,
+    2,
+    75869
+  ],
+  "head_dim": 128,
+  "hidden_act": "silu",
+  "hidden_size": 5120,
+  "initializer_range": 0.02,
+  "intermediate_size": 27648,
+  "loop_num": 2,
+  "loop_window_size": 64,
+  "max_position_embeddings": 16384,
+  "mlp_bias": false,
+  "model_type": "iquestloopcoder",
+  "num_attention_heads": 40,
+  "num_hidden_layers": 80,
+  "num_key_value_heads": 8,
+  "rms_norm_eps": 1e-05,
+  "rope_scaling": null,
+  "rope_theta": 500000,
+  "tie_word_embeddings": false,
+  "transformers_version": "4.56.0",
+  "use_cache": true,
+  "vocab_size": 76800,
+  "quantization_config": {
+    "config_groups": {
+      "group_0": {
+        "input_activations": {
+          "dynamic": false,
+          "num_bits": 4,
+          "type": "float",
+          "group_size": 16
+        },
+        "weights": {
+          "dynamic": false,
+          "num_bits": 4,
+          "type": "float",
+          "group_size": 16
+        },
+        "targets": [
+          "Linear"
+        ]
+      }
+    },
+    "ignore": [
+      "lm_head"
+    ],
+    "quant_algo": "NVFP4",
+    "producer": {
+      "name": "modelopt",
+      "version": "0.41.0"
+    },
+    "quant_method": "modelopt"
+  }
+}

configuration_iquestloopcoder.py

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+# IQuest NVFP4 Quantized Model - Official Architecture
+# Copyright 2024 IQuestLoopCoder Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+"""IQuestLoopCoder model configuration"""
+
+from transformers.configuration_utils import PretrainedConfig
+from transformers.utils import logging
+
+logger = logging.get_logger(__name__)
+
+
+class IQuestLoopCoderConfig(PretrainedConfig):
+    r"""
+    Configuration class for IQuestLoopCoder model.
+    
+    IQuestLoopCoder extends the standard LLaMA architecture with a loop mechanism:
+    - Loop 1: Standard attention, stores K1, V1
+    - Loop 2+: Mixed attention with gated combination of global (K1,V1) and local (K2,V2) KV
+    
+    The gate is computed as: gate = sigmoid(W @ Q + bias)
+    Mixed output = gate * Attention(Q, K1, V1) + (1 - gate) * SlidingWindowAttention(Q, K2, V2)
+    
+    Args:
+        vocab_size (`int`, *optional*, defaults to 76800):
+            Vocabulary size of the model.
+        hidden_size (`int`, *optional*, defaults to 5120):
+            Dimension of the hidden representations.
+        intermediate_size (`int`, *optional*, defaults to 27648):
+            Dimension of the MLP representations (FFN hidden size).
+        num_hidden_layers (`int`, *optional*, defaults to 80):
+            Number of hidden layers in the Transformer decoder.
+        num_attention_heads (`int`, *optional*, defaults to 40):
+            Number of attention heads for each attention layer.
+        num_key_value_heads (`int`, *optional*, defaults to 8):
+            Number of key-value heads (for GQA). If None, defaults to num_attention_heads.
+        head_dim (`int`, *optional*, defaults to 128):
+            Dimension of each attention head (hidden_size // num_attention_heads).
+        hidden_act (`str` or `function`, *optional*, defaults to `"silu"`):
+            Activation function in the MLP.
+        max_position_embeddings (`int`, *optional*, defaults to 8192):
+            Maximum sequence length.
+        initializer_range (`float`, *optional*, defaults to 0.02):
+            Standard deviation for weight initialization.
+        rms_norm_eps (`float`, *optional*, defaults to 1e-5):
+            Epsilon for RMS normalization layers.
+        use_cache (`bool`, *optional*, defaults to `True`):
+            Whether to use past key/values for generation.
+        tie_word_embeddings (`bool`, *optional*, defaults to `False`):
+            Whether to tie input and output embeddings.
+        rope_theta (`float`, *optional*, defaults to 500000.0):
+            Base value for rotary position embeddings.
+        attention_bias (`bool`, *optional*, defaults to `False`):
+            Whether to use bias in attention layers.
+        attention_dropout (`float`, *optional*, defaults to 0.0):
+            Dropout ratio for attention weights.
+        mlp_bias (`bool`, *optional*, defaults to `False`):
+            Whether to use bias in MLP layers.
+            
+        # Loop-specific parameters
+        loop_num (`int`, *optional*, defaults to 2):
+            Number of loops through the decoder.
+        loop_window_size (`int`, *optional*, defaults to 64):
+            Window size for sliding window attention in Loop 2+.
+    """
+    
+    model_type = "iquestloopcoder"
+    keys_to_ignore_at_inference = ["past_key_values"]
+
+    def __init__(
+        self,
+        vocab_size=76800,
+        hidden_size=5120,
+        intermediate_size=27648,
+        num_hidden_layers=80,
+        num_attention_heads=40,
+        num_key_value_heads=8,
+        head_dim=128,
+        hidden_act="silu",
+        max_position_embeddings=8192,
+        initializer_range=0.02,
+        rms_norm_eps=1e-5,
+        use_cache=True,
+        pad_token_id=None,
+        bos_token_id=1,
+        eos_token_id=2,
+        tie_word_embeddings=False,
+        rope_theta=500000.0,
+        rope_scaling=None,
+        attention_bias=False,
+        attention_dropout=0.0,
+        mlp_bias=False,
+        # Loop-specific parameters
+        loop_num=2,
+        loop_window_size=64,
+        **kwargs,
+    ):
+        self.vocab_size = vocab_size
+        self.max_position_embeddings = max_position_embeddings
+        self.hidden_size = hidden_size
+        self.intermediate_size = intermediate_size
+        self.num_hidden_layers = num_hidden_layers
+        self.num_attention_heads = num_attention_heads
+        self.head_dim = head_dim
+        
+        # GQA support
+        if num_key_value_heads is None:
+            num_key_value_heads = num_attention_heads
+        self.num_key_value_heads = num_key_value_heads
+        
+        self.hidden_act = hidden_act
+        self.initializer_range = initializer_range
+        self.rms_norm_eps = rms_norm_eps
+        self.use_cache = use_cache
+        self.rope_theta = rope_theta
+        self.rope_scaling = rope_scaling
+        self.attention_bias = attention_bias
+        self.attention_dropout = attention_dropout
+        self.mlp_bias = mlp_bias
+        
+        # Loop-specific
+        self.loop_num = loop_num
+        self.loop_window_size = loop_window_size
+
+        super().__init__(
+            pad_token_id=pad_token_id,
+            bos_token_id=bos_token_id,
+            eos_token_id=eos_token_id,
+            tie_word_embeddings=tie_word_embeddings,
+            **kwargs,
+        )
+

generation_config.json

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+{
+  "_from_model_config": true,
+  "bos_token_id": 1,
+  "eos_token_id": [
+    75864,
+    2,
+    75869
+  ],
+  "temperature": 0.3,
+  "top_p": 0.9,
+  "do_sample": true,
+  "transformers_version": "4.57.3"
+}

modeling_iquestloopcoder.py

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+# IQuest NVFP4 Quantized Model - Official Architecture
+"""
+Modified MIT License 
+
+Software Copyright© 2025 IQuest Research
+
+Our only modification is that, if the Software (or any derivative works
+thereof) is used for any of your commercial products or services, you shall
+prominently display "IQuest Coder" on the user interface of such product or
+service.
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+"""
+
+import logging
+from typing import Any, Callable, Optional, Union, Tuple, List
+
+import torch
+from torch import nn
+
+from transformers.activations import ACT2FN
+from transformers.cache_utils import Cache
+from transformers.generation import GenerationMixin
+from transformers.integrations import use_kernel_forward_from_hub
+from transformers.masking_utils import (
+    create_causal_mask,
+    create_sliding_window_causal_mask,
+)
+from transformers.modeling_flash_attention_utils import FlashAttentionKwargs
+from transformers.modeling_layers import (
+    GenericForQuestionAnswering,
+    GenericForSequenceClassification,
+    GenericForTokenClassification,
+    GradientCheckpointingLayer,
+)
+from transformers.modeling_outputs import (
+    BaseModelOutputWithPast,
+    CausalLMOutputWithPast,
+)
+from transformers.modeling_rope_utils import ROPE_INIT_FUNCTIONS, dynamic_rope_update
+from transformers.modeling_utils import ALL_ATTENTION_FUNCTIONS, PreTrainedModel
+from transformers.processing_utils import Unpack
+from transformers.utils import TransformersKwargs, auto_docstring, can_return_tuple
+from transformers.utils.generic import check_model_inputs
+from .configuration_iquestloopcoder import IQuestLoopCoderConfig
+
+
+logger = logging.getLogger(__name__)
+
+
+def needs_iquestloopcoder_cache(
+    cache: Optional[Cache]
+) -> bool:
+    # need to test more conditions
+    if cache is None:
+        return True
+    if isinstance(cache, IQuestLoopCoderCache):
+        return False
+    return True
+
+class IQuestLoopCoderMLP(nn.Module):
+    def __init__(self, config):
+        super().__init__()
+        self.config = config
+        self.hidden_size = config.hidden_size
+        self.intermediate_size = config.intermediate_size
+        self.gate_proj = nn.Linear(self.hidden_size, self.intermediate_size, bias=False)
+        self.up_proj = nn.Linear(self.hidden_size, self.intermediate_size, bias=False)
+        self.down_proj = nn.Linear(self.intermediate_size, self.hidden_size, bias=False)
+        self.act_fn = ACT2FN[config.hidden_act]
+
+    def forward(self, x):
+        down_proj = self.down_proj(self.act_fn(self.gate_proj(x)) * self.up_proj(x))
+        return down_proj
+
+
+def rotate_half(x):
+    """Rotates half the hidden dims of the input."""
+    x1 = x[..., : x.shape[-1] // 2]
+    x2 = x[..., x.shape[-1] // 2 :]
+    return torch.cat((-x2, x1), dim=-1)
+
+
+def apply_rotary_pos_emb(q, k, cos, sin, position_ids=None, unsqueeze_dim=1):
+    """Applies Rotary Position Embedding to the query and key tensors.
+
+    Args:
+        q (`torch.Tensor`): The query tensor.
+        k (`torch.Tensor`): The key tensor.
+        cos (`torch.Tensor`): The cosine part of the rotary embedding.
+        sin (`torch.Tensor`): The sine part of the rotary embedding.
+        position_ids (`torch.Tensor`, *optional*):
+            Deprecated and unused.
+        unsqueeze_dim (`int`, *optional*, defaults to 1):
+            The 'unsqueeze_dim' argument specifies the dimension along which to unsqueeze cos[position_ids] and
+            sin[position_ids] so that they can be properly broadcasted to the dimensions of q and k. For example, note
+            that cos[position_ids] and sin[position_ids] have the shape [batch_size, seq_len, head_dim]. Then, if q and
+            k have the shape [batch_size, heads, seq_len, head_dim], then setting unsqueeze_dim=1 makes
+            cos[position_ids] and sin[position_ids] broadcastable to the shapes of q and k. Similarly, if q and k have
+            the shape [batch_size, seq_len, heads, head_dim], then set unsqueeze_dim=2.
+    Returns:
+        `tuple(torch.Tensor)` comprising of the query and key tensors rotated using the Rotary Position Embedding.
+    """
+    cos = cos.unsqueeze(unsqueeze_dim)
+    sin = sin.unsqueeze(unsqueeze_dim)
+    q_embed = (q * cos) + (rotate_half(q) * sin)
+    k_embed = (k * cos) + (rotate_half(k) * sin)
+    return q_embed, k_embed
+
+
+def repeat_kv(hidden_states: torch.Tensor, n_rep: int) -> torch.Tensor:
+    """
+    This is the equivalent of torch.repeat_interleave(x, dim=1, repeats=n_rep). The hidden states go from (batch,
+    num_key_value_heads, seqlen, head_dim) to (batch, num_attention_heads, seqlen, head_dim)
+    """
+    batch, num_key_value_heads, slen, head_dim = hidden_states.shape
+    if n_rep == 1:
+        return hidden_states
+    hidden_states = hidden_states[:, :, None, :, :].expand(
+        batch, num_key_value_heads, n_rep, slen, head_dim
+    )
+    return hidden_states.reshape(batch, num_key_value_heads * n_rep, slen, head_dim)
+
+
+class IQuestLoopCoderCache(Cache):
+    """Cache implementation for IQuestLoopCoder that manages shared and local KV caches.
+    
+    - shared_key_cache/shared_value_cache: Stores KV from Loop 1 (global context)
+    - local_key_cache/local_value_cache: Stores KV from Loop 2+ (local window, only window_size tokens)
+    """
+    
+    def __init__(self, window_size: int, num_layers: int, loop_num: int=2):
+        # We intentionally don't call super().__init__ because the parent assumes static cache sizes.
+        self.window_size = window_size
+        self.num_layers = num_layers
+        self.loop_num = loop_num
+        
+        # Shared cache: stores Loop 1 KV (global context)   
+        self.shared_key_cache: List[Optional[torch.Tensor]] = [None] * self.num_layers
+        self.shared_value_cache: List[Optional[torch.Tensor]] = [None] * self.num_layers
+        
+        # Local cache: stores Loop 2+ KV (sliding window, only window_size tokens)
+        self.local_key_cache: List[Optional[torch.Tensor]] = [None] * (self.loop_num-1) * self.num_layers
+        self.local_value_cache: List[Optional[torch.Tensor]] = [None] * (self.loop_num-1) * self.num_layers
+        
+        self.layers: List[Any] = []  # attribute expected by HF Cache utilities
+        self._seen_tokens = 0
+    
+    def update_shared(
+        self,
+        key_states: torch.Tensor,
+        value_states: torch.Tensor,
+        layer_idx: int,
+        cache_kwargs: Optional[dict] = None,
+    ) -> Tuple[torch.Tensor, torch.Tensor]:
+        """Update shared cache (Loop 1 KV)."""
+        # only store the first loop's kv cache
+        loop_idx = cache_kwargs.get("loop_idx", 0)
+        assert loop_idx == 0
+        if layer_idx < 0 or layer_idx >= self.num_layers:
+            raise ValueError(f"layer_idx must be in [0, {self.num_layers}), got {layer_idx}")
+        
+        cached_key = self.shared_key_cache[layer_idx]
+        cached_value = self.shared_value_cache[layer_idx]
+        
+        if cached_key is None:
+            self.shared_key_cache[layer_idx] = key_states
+            self.shared_value_cache[layer_idx] = value_states
+        else:
+            if (
+                key_states.shape[0] != cached_key.shape[0]
+                or key_states.shape[1] != cached_key.shape[1]
+                or key_states.shape[3] != cached_key.shape[3]
+            ):
+                raise ValueError(
+                    "Cached and incoming key/value tensors must match on batch, head, and head_dim dimensions."
+                )
+            assert key_states.shape[2] == 1
+            assert value_states.shape[2] == 1
+            self.shared_key_cache[layer_idx] = torch.cat([cached_key, key_states], dim=2)
+            self.shared_value_cache[layer_idx] = torch.cat([cached_value, value_states], dim=2)
+        
+        result_key = self.shared_key_cache[layer_idx]
+        result_value = self.shared_value_cache[layer_idx]
+        assert result_key is not None and result_value is not None
+        
+        # Track sequence length
+        self._seen_tokens = result_key.shape[2]
+        return result_key, result_value
+    
+    def update_local(
+        self,
+        key_states: torch.Tensor,
+        value_states: torch.Tensor,
+        layer_idx: int,
+        cache_kwargs: Optional[dict] = None,
+    ) -> Tuple[torch.Tensor, torch.Tensor]:
+        """Update local cache (Loop 2+ KV) with sliding window management.
+        
+        Ensures the local cache always contains at most window_size tokens.
+        Local cache only stores loop_idx > 0 (i.e., loop_idx = 1, 2, ...).
+        For loop_idx = 1, cache_idx = layer_idx + 0 * num_layers = layer_idx (0 to num_layers-1)
+        For loop_idx = 2, cache_idx = layer_idx + 1 * num_layers (num_layers to 2*num_layers-1)
+        """
+        # only store the local kv cache for loop_idx > 0
+        loop_idx = cache_kwargs.get("loop_idx", 0)
+        assert loop_idx > 0, f"update_local should only be called for loop_idx > 0, got {loop_idx}"
+        if layer_idx < 0 or layer_idx >= self.num_layers:
+            raise ValueError(f"layer_idx must be in [0, {self.num_layers}), got {layer_idx}")
+        
+        # Local cache size is (loop_num-1) * num_layers
+        # loop_idx = 1 maps to indices 0 to num_layers-1
+        # loop_idx = 2 maps to indices num_layers to 2*num_layers-1
+        # So offset = (loop_idx - 1) * num_layers
+        cache_idx = layer_idx + (loop_idx - 1) * self.num_layers
+        
+        # Validate cache_idx is within bounds
+        max_cache_idx = (self.loop_num - 1) * self.num_layers
+        if cache_idx >= max_cache_idx:
+            raise IndexError(
+                f"cache_idx {cache_idx} out of range. "
+                f"loop_idx={loop_idx}, layer_idx={layer_idx}, "
+                f"max_cache_idx={max_cache_idx - 1}"
+            )
+        cached_key = self.local_key_cache[cache_idx]
+        cached_value = self.local_value_cache[cache_idx]
+        
+        if cached_key is None:
+            # First token in local cache, for prefill
+            # If prefill sequence is longer than window_size, only keep the last window_size tokens
+            seq_len = key_states.shape[2]
+            if seq_len > self.window_size:
+                # Keep only the last window_size tokens
+                start_idx = seq_len - self.window_size
+                self.local_key_cache[cache_idx] = key_states[:, :, start_idx:, :]
+                self.local_value_cache[cache_idx] = value_states[:, :, start_idx:, :]
+            else:
+                self.local_key_cache[cache_idx] = key_states
+                self.local_value_cache[cache_idx] = value_states
+        else:
+            # store the local kv cache for decode
+            if (
+                key_states.shape[0] != cached_key.shape[0]
+                or key_states.shape[1] != cached_key.shape[1]
+                or key_states.shape[3] != cached_key.shape[3]
+            ):
+                raise ValueError(
+                    "Cached and incoming key/value tensors must match on batch, head, and head_dim dimensions."
+                )
+            assert cached_value is not None
+            assert key_states.shape[2] == 1
+            assert value_states.shape[2] == 1
+            # Concatenate new tokens
+            new_key = torch.cat([cached_key, key_states], dim=2)
+            new_value = torch.cat([cached_value, value_states], dim=2)
+            
+            # Ensure the total length doesn't exceed window_size
+            total_len = new_key.shape[2]
+            if total_len > self.window_size:
+                # Keep only the last window_size tokens
+                self.local_key_cache[cache_idx] = new_key[:, :, -self.window_size:, :]
+                self.local_value_cache[cache_idx] = new_value[:, :, -self.window_size:, :]
+            else:
+                self.local_key_cache[cache_idx] = new_key
+                self.local_value_cache[cache_idx] = new_value
+        
+        result_key = self.local_key_cache[cache_idx]
+        result_value = self.local_value_cache[cache_idx]
+        assert result_key is not None and result_value is not None
+        # Ensure the result is at most window_size (can be less during prefill when sequence is shorter)
+        assert result_key.shape[2] <= self.window_size, f"Local cache size {result_key.shape[2]} exceeds window_size {self.window_size}"
+        
+        return result_key, result_value
+    
+    def get_shared(self, layer_idx: int|List[int]) -> Tuple[Optional[torch.Tensor], Optional[torch.Tensor]]:
+        """Get shared cache for some layer."""
+        if isinstance(layer_idx, list):
+            return [self.get_shared(layer_idx) for layer_idx in layer_idx]
+        if layer_idx < 0 or layer_idx >= self.num_layers:
+            raise ValueError(f"layer_idx must be in [0, {self.num_layers}), got {layer_idx}")
+        return self.shared_key_cache[layer_idx], self.shared_value_cache[layer_idx]
+    
+    def get_local(self, layer_idx: int|List[int], loop_idx: int) -> Tuple[Optional[torch.Tensor], Optional[torch.Tensor]]:
+        """Get local cache for a layer."""
+        assert loop_idx > 0, f"get_local should only be called for loop_idx > 0, got {loop_idx}"
+        if isinstance(layer_idx, list):
+            return [self.get_local(layer_idx, loop_idx) for layer_idx in layer_idx]
+        if layer_idx < 0 or layer_idx >= self.num_layers:
+            raise ValueError(f"layer_idx must be in [0, {self.num_layers}), got {layer_idx}")
+        
+        # Local cache size is (loop_num-1) * num_layers
+        # loop_idx = 1 maps to indices 0 to num_layers-1
+        # loop_idx = 2 maps to indices num_layers to 2*num_layers-1
+        # So offset = (loop_idx - 1) * num_layers
+        cache_idx = layer_idx + (loop_idx - 1) * self.num_layers
+        
+        # Validate cache_idx is within bounds
+        max_cache_idx = (self.loop_num - 1) * self.num_layers
+        if cache_idx >= max_cache_idx:
+            raise IndexError(
+                f"cache_idx {cache_idx} out of range. "
+                f"loop_idx={loop_idx}, layer_idx={layer_idx}, "
+                f"max_cache_idx={max_cache_idx - 1}"
+            )
+        
+        return self.local_key_cache[cache_idx], self.local_value_cache[cache_idx]
+    
+    def update(
+        self,
+        key_states: torch.Tensor,
+        value_states: torch.Tensor,
+        layer_idx: int,
+        cache_kwargs: Optional[dict] = None,
+    ) -> Tuple[torch.Tensor, torch.Tensor]:
+        """Default update method (for compatibility, updates shared cache)."""
+        loop_idx = cache_kwargs.get("loop_idx", 0)
+        assert loop_idx < self.loop_num
+        if loop_idx == 0:
+            return self.update_shared(key_states, value_states, layer_idx, cache_kwargs)
+        else:
+            return self.update_local(key_states, value_states, layer_idx, cache_kwargs)
+        
+    def get_seq_length(self, layer_idx: Optional[int] = 0) -> int:
+        """Get sequence length from shared cache."""
+        if layer_idx is None:
+            layer_idx = 0
+        if layer_idx < 0 or layer_idx >= self.loop_num * self.num_layers:
+            return 0
+        cached_key = self.shared_key_cache[layer_idx]
+        if cached_key is None:
+            return 0
+        return cached_key.shape[2]
+    
+    def get_max_length(self) -> Optional[int]:
+        return None
+    
+    def get_usable_length(
+        self, new_seq_length: int, layer_idx: Optional[int] = 0
+    ) -> int:
+        return self.get_seq_length(layer_idx)
+    
+    def reorder_cache(self, beam_idx: torch.LongTensor) -> None:
+        # pass
+        raise NotImplementedError("Reorder cache for beam search is not implemented")
+        """Reorder cache for beam search.
+        
+        Reorders both shared cache (Loop 1) and local cache (Loop 2+) according to beam_idx.
+        """
+        # Reorder shared cache (Loop 1, loop_idx=0)
+        for layer_idx in range(self.num_layers):
+            if self.shared_key_cache[layer_idx] is not None:
+                device = self.shared_key_cache[layer_idx].device
+                self.shared_key_cache[layer_idx] = self.shared_key_cache[layer_idx].index_select(0, beam_idx.to(device))
+                self.shared_value_cache[layer_idx] = self.shared_value_cache[layer_idx].index_select(0, beam_idx.to(device))
+        
+        # Reorder local cache (Loop 2+, loop_idx > 0)
+        # Local cache size is (loop_num-1) * num_layers
+        for cache_idx in range(len(self.local_key_cache)):
+            if self.local_key_cache[cache_idx] is not None:
+                device = self.local_key_cache[cache_idx].device
+                self.local_key_cache[cache_idx] = self.local_key_cache[cache_idx].index_select(0, beam_idx.to(device))
+                self.local_value_cache[cache_idx] = self.local_value_cache[cache_idx].index_select(0, beam_idx.to(device))
+    
+    @property
+    def is_compileable(self) -> bool:
+        return False
+    
+    def clear(self) -> None:
+        """Clear all caches."""
+        logger.debug("Clearing IQuestLoopCoderCache")
+        self.shared_key_cache = [None] * self.num_layers
+        self.shared_value_cache = [None] * self.num_layers
+        self.local_key_cache = [None] * self.num_layers * (self.loop_num-1)
+        self.local_value_cache = [None] * self.num_layers * (self.loop_num-1)
+        self._seen_tokens = 0
+
+
+def eager_attention_forward(
+    module: nn.Module,
+    query: torch.Tensor,
+    key: torch.Tensor,
+    value: torch.Tensor,
+    attention_mask: Optional[torch.Tensor],
+    scaling: float,
+    dropout: float = 0.0,
+    **kwargs: Unpack[TransformersKwargs],
+):
+    key_states = repeat_kv(key, module.num_key_value_groups)
+    value_states = repeat_kv(value, module.num_key_value_groups)
+
+    attn_weights = torch.matmul(query, key_states.transpose(2, 3)) * scaling
+    if attention_mask is not None:
+        causal_mask = attention_mask[:, :, :, : key_states.shape[-2]]
+        attn_weights = attn_weights + causal_mask
+
+    attn_weights = nn.functional.softmax(attn_weights, dim=-1, dtype=torch.float32).to(
+        query.dtype
+    )
+    attn_weights = nn.functional.dropout(
+        attn_weights, p=dropout, training=module.training
+    )
+    attn_output = torch.matmul(attn_weights, value_states)
+    attn_output = attn_output.transpose(1, 2).contiguous()
+
+    return attn_output, attn_weights
+
+class LoopGateProjection(nn.Module):
+    """Gate projection for mixed attention in Loop 2+.
+    
+    Computes: g = sigmoid(linear(Q)) for each head independently.
+    This gate determines how much to use Loop1's KV (global) vs current loop's KV (local).
+    """
+    
+    def __init__(self, num_heads: int, head_dim: int):
+        super().__init__()
+        self.num_heads = num_heads
+        self.head_dim = head_dim
+        # Each head has its own gate: Linear(head_dim -> 1) per head
+        # Implemented as [num_heads, head_dim] weight + [num_heads] bias
+        self.weight = nn.Parameter(torch.zeros(num_heads, head_dim))
+        self.bias = nn.Parameter(torch.zeros(num_heads))
+    
+    def forward(self, query: torch.Tensor) -> torch.Tensor:
+        """Compute gate values from query tensor.
+        
+        Args:
+            query: [batch, num_heads, seq_len, head_dim]
+            
+        Returns:
+            gate: [batch, num_heads, seq_len, 1]
+        """
+        # query: [batch, num_heads, seq_len, head_dim]
+        # weight: [num_heads, head_dim]
+        # For each head h: gate_h = query[:, h, :, :] @ weight[h, :].T + bias[h]
+        # Using einsum: gate = einsum('bhsd,hd->bhs', query, weight) + bias
+        gate_logits = torch.einsum('bhsd,hd->bhs', query, self.weight)  # [batch, num_heads, seq_len]
+        gate_logits = gate_logits + self.bias[None, :, None]  # broadcast bias
+        gate = torch.sigmoid(gate_logits)
+        return gate.unsqueeze(-1)  # [batch, num_heads, seq_len, 1]
+
+class IQuestLoopCoderAttention(nn.Module):
+    """Multi-headed attention from 'Attention Is All You Need' paper"""
+
+    def __init__(self, config: IQuestLoopCoderConfig, layer_idx: int):
+        super().__init__()
+        self.config = config
+        assert layer_idx >= 0 and layer_idx < config.num_hidden_layers
+        self.layer_idx = layer_idx
+
+        self.head_dim = getattr(
+            config, "head_dim", config.hidden_size // config.num_attention_heads
+        )
+        self.num_key_value_groups = (
+            config.num_attention_heads // config.num_key_value_heads
+        )
+        self.scaling = self.head_dim**-0.5
+        self.attention_dropout = config.attention_dropout
+        self.is_causal = True
+        self.q_proj = nn.Linear(
+            config.hidden_size, config.num_attention_heads * self.head_dim, bias=False
+        )
+        self.k_proj = nn.Linear(
+            config.hidden_size, config.num_key_value_heads * self.head_dim, bias=False
+        )
+        self.v_proj = nn.Linear(
+            config.hidden_size, config.num_key_value_heads * self.head_dim, bias=False
+        )
+        self.o_proj = nn.Linear(
+            config.num_attention_heads * self.head_dim, config.hidden_size, bias=False
+        )
+
+    def forward(
+        self,
+        hidden_states: torch.Tensor,
+        position_embeddings: tuple[torch.Tensor, torch.Tensor],
+        attention_mask: Optional[torch.Tensor],
+        past_key_value: Optional[Cache] = None,
+        cache_position: Optional[torch.LongTensor] = None,
+        loop_idx: int = 0,
+        gate_proj: Optional[LoopGateProjection] = None,
+        **kwargs: Unpack[FlashAttentionKwargs],
+    ) -> tuple[torch.Tensor, Optional[torch.Tensor], Optional[tuple[torch.Tensor]]]:
+        if loop_idx == 0:
+            return self.forward_loop1(hidden_states, loop_idx, position_embeddings, attention_mask, past_key_value, cache_position, **kwargs)
+        else:
+            return self.forward_loop2(hidden_states, loop_idx, position_embeddings, attention_mask, past_key_value, cache_position, gate_proj, **kwargs)
+        
+    def forward_loop1(
+        self, 
+        hidden_states: torch.Tensor, 
+        loop_idx: int,
+        position_embeddings: tuple[torch.Tensor, torch.Tensor], 
+        attention_mask: Optional[torch.Tensor], 
+        past_key_value: Optional[IQuestLoopCoderCache] = None, 
+        cache_position: Optional[torch.LongTensor] = None, 
+        **kwargs: Unpack[FlashAttentionKwargs]) -> tuple[torch.Tensor, Optional[torch.Tensor], Optional[tuple[torch.Tensor]]]:
+        input_shape = hidden_states.shape[:-1]
+        hidden_shape = (*input_shape, -1, self.head_dim)
+
+        query_states = self.q_proj(hidden_states).view(hidden_shape).transpose(1, 2)
+        key_states = self.k_proj(hidden_states).view(hidden_shape).transpose(1, 2)
+        value_states = self.v_proj(hidden_states).view(hidden_shape).transpose(1, 2)
+
+        cos, sin = position_embeddings
+        query_states, key_states = apply_rotary_pos_emb(
+            query_states, key_states, cos, sin
+        )
+
+        if past_key_value is not None:
+            # sin and cos are specific to RoPE models; cache_position needed for the static cache
+            cache_kwargs = {"sin": sin, "cos": cos, "cache_position": cache_position, "loop_idx": loop_idx}
+            key_states, value_states = past_key_value.update(
+                key_states,
+                value_states,
+                self.layer_idx,
+                cache_kwargs,
+            )
+
+        attention_interface: Callable = eager_attention_forward
+        if self.config._attn_implementation != "eager":
+            attention_interface = ALL_ATTENTION_FUNCTIONS[
+                self.config._attn_implementation
+            ]
+
+        attn_output, attn_weights = attention_interface(
+            self,
+            query_states,
+            key_states,
+            value_states,
+            attention_mask,
+            dropout=0.0 if not self.training else self.attention_dropout,
+            scaling=self.scaling,
+            **kwargs,
+        )
+
+        attn_output = attn_output.reshape(*input_shape, -1).contiguous()
+        attn_output = self.o_proj(attn_output)
+        return attn_output, (attn_weights)
+
+
+    def forward_loop2(
+        self, 
+        hidden_states: torch.Tensor, 
+        loop_idx: int,
+        position_embeddings: tuple[torch.Tensor, torch.Tensor], 
+        attention_mask: Optional[torch.Tensor], 
+        past_key_value: Optional[IQuestLoopCoderCache] = None, 
+        cache_position: Optional[torch.LongTensor] = None, 
+        gate_proj: Optional[LoopGateProjection] = None,
+        **kwargs: Unpack[FlashAttentionKwargs]) -> tuple[torch.Tensor, Optional[torch.Tensor], Optional[tuple[torch.Tensor]]]:
+        
+        input_shape = hidden_states.shape[:-1]
+        hidden_shape = (*input_shape, -1, self.head_dim)
+
+        query_states = self.q_proj(hidden_states).view(hidden_shape).transpose(1, 2)
+        key_states_local = self.k_proj(hidden_states).view(hidden_shape).transpose(1, 2)
+        value_states_local = self.v_proj(hidden_states).view(hidden_shape).transpose(1, 2)
+
+        cos, sin = position_embeddings
+        query_states, key_states_local = apply_rotary_pos_emb(
+            query_states, key_states_local, cos, sin
+        )
+
+        key_states_share, value_states_share = None, None
+        if past_key_value is not None:
+            # get key_share, value_share from past_key_value
+            cache_kwargs = {"sin": sin, "cos": cos, "cache_position": cache_position, "loop_idx": loop_idx}
+            key_states_share, value_states_share = past_key_value.get_shared(self.layer_idx)
+            key_states_local, value_states_local = past_key_value.update(
+                key_states_local,
+                value_states_local,
+                self.layer_idx,
+                cache_kwargs,
+            )
+
+        attention_interface: Callable = eager_attention_forward
+        if self.config._attn_implementation != "eager":
+            attention_interface = ALL_ATTENTION_FUNCTIONS[
+                self.config._attn_implementation
+            ]
+        
+        # Create masks for global and local attention
+        # Global attention: full causal mask (can see all tokens in shared cache)
+        # Local attention: causal mask for local window (can only see window_size tokens in local cache)
+        attention_mask_global = attention_mask  # Use full causal mask for global attention
+        
+        # For local attention, create a mask that matches the local cache size
+        # The local cache already contains only the last window_size tokens,
+        # so we need a causal mask that allows attention within this window
+        attention_mask_local = None
+        if key_states_local is not None and value_states_local is not None:
+            # Local cache has shape [batch, num_heads, local_seq_len, head_dim]
+            # where local_seq_len <= window_size
+            local_seq_len = key_states_local.shape[2]
+            bsz = query_states.shape[0]
+            q_len = query_states.shape[2]
+            
+            # Create a causal mask for local attention
+            # This allows each query position to attend to all positions up to and including itself
+            # within the local window (which is already the last window_size tokens)
+            device = query_states.device
+            dtype = query_states.dtype
+            
+            if attention_mask is not None:
+                # If we have a global mask, we need to adapt it for local attention
+                # The global mask shape is [batch, 1, q_len, global_kv_len]
+                # For local attention, we only need the last local_seq_len positions
+                global_kv_len = attention_mask.shape[-1]
+                
+                if global_kv_len >= local_seq_len:
+                    # Extract the last local_seq_len columns from the global mask
+                    # This represents attention to the last window_size tokens
+                    attention_mask_local = attention_mask[..., -local_seq_len:]
+                else:
+                    # If global mask is shorter than local_seq_len, create a simple causal mask
+                    # This can happen during prefill when local cache is being built
+                    attention_mask_local = torch.triu(
+                        torch.ones((q_len, local_seq_len), device=device, dtype=dtype) * float("-inf"),
+                        diagonal=1
+                    ).unsqueeze(0).expand(bsz, -1, -1, -1)  # [batch, 1, q_len, local_seq_len]
+            else:
+                # No global mask provided, create a simple causal mask for local attention
+                # This allows full attention within the local window (causal)
+                attention_mask_local = torch.triu(
+                    torch.ones((q_len, local_seq_len), device=device, dtype=dtype) * float("-inf"),
+                    diagonal=1
+                ).unsqueeze(0).expand(bsz, -1, -1, -1)  # [batch, 1, q_len, local_seq_len]
+        
+        # global attn: attend to all tokens in shared cache
+        attn_output_global, attn_weights_global = attention_interface(
+            self,
+            query_states,
+            key_states_share,
+            value_states_share,
+            attention_mask_global,
+            dropout=0.0 if not self.training else self.attention_dropout,
+            scaling=self.scaling,
+            **kwargs,
+        )
+
+        # local attn: attend only to tokens in local cache (window_size)
+        attn_output_local, attn_weights_local = attention_interface(
+            self,
+            query_states,
+            key_states_local,
+            value_states_local,
+            attention_mask_local,
+            dropout=0.0 if not self.training else self.attention_dropout,
+            scaling=self.scaling,
+            **kwargs,
+        )
+
+        # attention_interface returns [batch, seq_len, num_heads, head_dim] for eager_attention_forward
+        # but Flash Attention might return [batch, num_heads, seq_len, head_dim]
+        # We need [batch, num_heads, seq_len, head_dim] to match gate shape
+        q_len = query_states.shape[2]  # Query sequence length
+        num_heads = query_states.shape[1]
+        
+        # Normalize attn_output_global to [batch, num_heads, q_len, head_dim]
+        if attn_output_global.dim() == 4:
+            # Check if shape is [batch, seq_len, num_heads, head_dim] (eager) or [batch, num_heads, seq_len, head_dim] (flash)
+            if attn_output_global.shape[1] == q_len:
+                # Shape is [batch, seq_len, num_heads, head_dim], transpose to [batch, num_heads, seq_len, head_dim]
+                attn_output_global = attn_output_global.transpose(1, 2)
+            # Ensure sequence length matches query length (take first q_len tokens)
+            if attn_output_global.shape[2] > q_len:
+                attn_output_global = attn_output_global[:, :, :q_len, :]
+            elif attn_output_global.shape[2] < q_len:
+                # This shouldn't happen, but handle it gracefully
+                raise ValueError(f"attn_output_global seq_len {attn_output_global.shape[2]} < q_len {q_len}")
+        
+        # Normalize attn_output_local to [batch, num_heads, q_len, head_dim]
+        if attn_output_local.dim() == 4:
+            # Check if shape is [batch, seq_len, num_heads, head_dim] (eager) or [batch, num_heads, seq_len, head_dim] (flash)
+            if attn_output_local.shape[1] == q_len:
+                # Shape is [batch, seq_len, num_heads, head_dim], transpose to [batch, num_heads, seq_len, head_dim]
+                attn_output_local = attn_output_local.transpose(1, 2)
+            # Ensure sequence length matches query length (take first q_len tokens)
+            if attn_output_local.shape[2] > q_len:
+                attn_output_local = attn_output_local[:, :, :q_len, :]
+            elif attn_output_local.shape[2] < q_len:
+                # This shouldn't happen, but handle it gracefully
+                raise ValueError(f"attn_output_local seq_len {attn_output_local.shape[2]} < q_len {q_len}")
+
+        assert gate_proj is not None
+        gate = gate_proj(query_states)  # [batch, num_heads, seq_len, 1]
+        mixed_attn_output = attn_output_local * (1 - gate) + attn_output_global * gate
+
+        mixed_attn_output = mixed_attn_output.reshape(*input_shape, -1).contiguous()
+        mixed_attn_output = self.o_proj(mixed_attn_output)
+        return mixed_attn_output, (attn_weights_global, attn_weights_local, attn_output_global, attn_output_local, gate)
+
+
+@use_kernel_forward_from_hub("RMSNorm")
+class IQuestLoopCoderRMSNorm(nn.Module):
+    def __init__(self, hidden_size, eps=1e-6):
+        """
+        IQuestLoopCoderRMSNorm is equivalent to T5LayerNorm
+        """
+        super().__init__()
+        self.weight = nn.Parameter(torch.ones(hidden_size))
+        self.variance_epsilon = eps
+
+    def forward(self, hidden_states):
+        input_dtype = hidden_states.dtype
+        hidden_states = hidden_states.to(torch.float32)
+        variance = hidden_states.pow(2).mean(-1, keepdim=True)
+        hidden_states = hidden_states * torch.rsqrt(variance + self.variance_epsilon)
+        return self.weight * hidden_states.to(input_dtype)
+
+    def extra_repr(self):
+        return f"{tuple(self.weight.shape)}, eps={self.variance_epsilon}"
+
+
+class IQuestLoopCoderDecoderLayer(GradientCheckpointingLayer):
+    def __init__(self, config: IQuestLoopCoderConfig, layer_idx: int):
+        super().__init__()
+        self.hidden_size = config.hidden_size
+
+        self.self_attn = IQuestLoopCoderAttention(config=config, layer_idx=layer_idx)
+
+        self.mlp = IQuestLoopCoderMLP(config)
+        self.input_layernorm = IQuestLoopCoderRMSNorm(config.hidden_size, eps=config.rms_norm_eps)
+        self.post_attention_layernorm = IQuestLoopCoderRMSNorm(
+            config.hidden_size, eps=config.rms_norm_eps
+        )
+        self.layer_idx = layer_idx
+    
+    def forward(
+        self,
+        hidden_states: torch.Tensor,
+        loop_idx: int = 0,
+        gate_proj: Optional[LoopGateProjection] = None,
+        attention_mask: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.LongTensor] = None,
+        past_key_value: Optional[Cache] = None,
+        use_cache: Optional[bool] = False,
+        cache_position: Optional[torch.LongTensor] = None,
+        position_embeddings: Optional[
+            tuple[torch.Tensor, torch.Tensor]
+        ] = None,  # necessary, but kept here for BC
+        **kwargs: Unpack[TransformersKwargs],
+    ) -> tuple[torch.Tensor]:
+        residual = hidden_states
+        hidden_states = self.input_layernorm(hidden_states)
+        # Self Attention
+        hidden_states, _ = self.self_attn(
+            hidden_states=hidden_states,
+            attention_mask=attention_mask,
+            position_ids=position_ids,
+            past_key_value=past_key_value,
+            use_cache=use_cache,
+            cache_position=cache_position,
+            loop_idx=loop_idx,
+            position_embeddings=position_embeddings,
+            gate_proj=gate_proj if loop_idx > 0 else None,
+            **kwargs,
+        )
+
+        hidden_states = residual + hidden_states
+        
+        # Fully Connected
+        residual = hidden_states
+        hidden_states = self.post_attention_layernorm(hidden_states)
+        hidden_states = self.mlp(hidden_states)
+        hidden_states = residual + hidden_states
+        return hidden_states
+
+
+@auto_docstring
+class IQuestLoopCoderPreTrainedModel(PreTrainedModel):
+    config: IQuestLoopCoderConfig
+    base_model_prefix = "model"
+    supports_gradient_checkpointing = True
+    _no_split_modules = ["IQuestLoopCoderDecoderLayer"]
+    _skip_keys_device_placement = ["past_key_values"]
+    _supports_flash_attn = True
+    _supports_sdpa = True
+    _supports_flex_attn = True
+
+    _can_compile_fullgraph = True
+    _supports_attention_backend = True
+    _can_record_outputs = {
+        "hidden_states": IQuestLoopCoderDecoderLayer,
+        "attentions": IQuestLoopCoderAttention,
+    }
+
+    # Important for inference with `device_map` / low_cpu_mem_usage:
+    # Avoid initializing parameters that are not present in the checkpoint.
+    # Those should keep their constructor-time initialization (e.g. zeros for LoopGateProjection),
+    # instead of being materialized from meta/empty tensors which can contain NaNs.
+    def _init_weights(self, module: nn.Module) -> None:
+        return
+
+
+class IQuestLoopCoderRotaryEmbedding(nn.Module):
+    def __init__(self, config: IQuestLoopCoderConfig, device=None):
+        super().__init__()
+        # BC: "rope_type" was originally "type"
+        if hasattr(config, "rope_scaling") and isinstance(config.rope_scaling, dict):
+            self.rope_type = config.rope_scaling.get(
+                "rope_type", config.rope_scaling.get("type")
+            )
+        else:
+            self.rope_type = "default"
+        self.max_seq_len_cached = config.max_position_embeddings
+        self.original_max_seq_len = config.max_position_embeddings
+
+        self.config = config
+        self.rope_init_fn = ROPE_INIT_FUNCTIONS[self.rope_type]
+
+        inv_freq, self.attention_scaling = self.rope_init_fn(self.config, device)
+        self.register_buffer("inv_freq", inv_freq, persistent=False)
+        self.original_inv_freq = self.inv_freq
+
+    @torch.no_grad()
+    @dynamic_rope_update  # power user: used with advanced RoPE types (e.g. dynamic rope)
+    def forward(self, x, position_ids):
+        inv_freq_expanded = (
+            self.inv_freq[None, :, None]
+            .float()
+            .expand(position_ids.shape[0], -1, 1)
+            .to(x.device)
+        )
+        position_ids_expanded = position_ids[:, None, :].float()
+
+        device_type = (
+            x.device.type
+            if isinstance(x.device.type, str) and x.device.type != "mps"
+            else "cpu"
+        )
+        with torch.autocast(device_type=device_type, enabled=False):  # Force float32
+            freqs = (
+                inv_freq_expanded.float() @ position_ids_expanded.float()
+            ).transpose(1, 2)
+            emb = torch.cat((freqs, freqs), dim=-1)
+            cos = emb.cos() * self.attention_scaling
+            sin = emb.sin() * self.attention_scaling
+
+        return cos.to(dtype=x.dtype), sin.to(dtype=x.dtype)
+
+
+@auto_docstring
+class IQuestLoopCoderModel(IQuestLoopCoderPreTrainedModel):
+    def __init__(self, config: IQuestLoopCoderConfig):
+        super().__init__(config)
+        self.padding_idx = config.pad_token_id
+        self.vocab_size = config.vocab_size
+
+        self.embed_tokens = nn.Embedding(
+            config.vocab_size, config.hidden_size, self.padding_idx
+        )
+        self.layers = nn.ModuleList(
+            [
+                IQuestLoopCoderDecoderLayer(config, layer_idx)
+                for layer_idx in range(config.num_hidden_layers)
+            ]
+        )
+        self.norm = IQuestLoopCoderRMSNorm(config.hidden_size, eps=config.rms_norm_eps)
+        self.rotary_emb = IQuestLoopCoderRotaryEmbedding(config=config)
+        self.gradient_checkpointing = False
+        self.loop_num = getattr(self.config, "loop_num", 2)
+        self.loop_window_size = getattr(self.config, "loop_window_size", 64)
+
+        # Gate projections for Loop 2+ (one per layer)
+        self.gate_projections = nn.ModuleList([
+            LoopGateProjection(config.num_attention_heads, config.head_dim)
+            for _ in range(config.num_hidden_layers)
+        ])
+
+        # Initialize weights and apply final processing
+        self.post_init()
+
+    @check_model_inputs
+    @auto_docstring
+    def forward(
+        self,
+        input_ids: Optional[torch.LongTensor] = None,
+        attention_mask: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.LongTensor] = None,
+        past_key_values: Optional[Cache] = None,
+        inputs_embeds: Optional[torch.FloatTensor] = None,
+        use_cache: Optional[bool] = None,
+        cache_position: Optional[torch.LongTensor] = None,
+        **kwargs: Unpack[TransformersKwargs],
+    ) -> BaseModelOutputWithPast:
+
+        if (input_ids is None) ^ (inputs_embeds is not None):
+            raise ValueError(
+                "You must specify exactly one of input_ids or inputs_embeds"
+            )
+
+        if inputs_embeds is None:
+            inputs_embeds = self.embed_tokens(input_ids)
+
+        if use_cache is None:
+            use_cache = self.config.use_cache
+
+        if use_cache:
+            if needs_iquestloopcoder_cache(past_key_values):
+                past_key_values = IQuestLoopCoderCache(self.loop_window_size, self.config.num_hidden_layers, self.loop_num)
+
+        if cache_position is None:
+            past_seen_tokens = (
+                past_key_values.get_seq_length() if past_key_values is not None else 0
+            )
+            cache_position = torch.arange(
+                past_seen_tokens,
+                past_seen_tokens + inputs_embeds.shape[1],
+                device=inputs_embeds.device,
+            )
+
+        if position_ids is None:
+            position_ids = cache_position.unsqueeze(0)
+
+        # It may already have been prepared by e.g. `generate`
+        if not isinstance(causal_mask_mapping := attention_mask, dict):
+            # Prepare mask arguments
+            mask_kwargs = {
+                "config": self.config,
+                "input_embeds": inputs_embeds,
+                "attention_mask": attention_mask,
+                "cache_position": cache_position,
+                "past_key_values": past_key_values,
+                "position_ids": position_ids,
+            }
+            # Create the full causal mask for all layers
+            # All layers use full_attention (no sliding window layers)
+            full_attention_mask = create_causal_mask(**mask_kwargs)
+            causal_mask_mapping = {
+                "full_attention": full_attention_mask,
+            }
+
+        hidden_states = inputs_embeds
+
+        # create position embeddings to be shared across the decoder layers
+        position_embeddings = self.rotary_emb(hidden_states, position_ids)
+        hidden_states_list = []
+
+        for loop_idx in range(self.loop_num):
+            # For each loop, use the full_attention mask
+            # Loop 1: uses full_attention mask directly
+            # Loop 2+: forward_loop2 will create local mask internally, but uses full_attention mask for global attention
+            loop_attention_mask = causal_mask_mapping["full_attention"]
+            
+            for layer_idx, decoder_layer in enumerate(self.layers[: self.config.num_hidden_layers]):
+                hidden_states = decoder_layer(
+                    hidden_states,
+                    loop_idx,
+                    gate_proj=self.gate_projections[layer_idx] if loop_idx > 0 else None,
+                    attention_mask=loop_attention_mask,
+                    position_ids=position_ids,
+                    past_key_value=past_key_values,
+                    use_cache=use_cache,
+                    cache_position=cache_position,
+                    position_embeddings=position_embeddings,
+                    **kwargs,
+                )
+            if loop_idx < self.loop_num - 1:
+                hidden_states_list.append(hidden_states)
+
+        hidden_states = self.norm(hidden_states)
+        hidden_states_list.append(hidden_states)
+        
+        return (
+            BaseModelOutputWithPast(
+                last_hidden_state=hidden_states,
+                past_key_values=past_key_values if use_cache else None,
+            ),
+            hidden_states_list,
+        )
+
+
+@auto_docstring
+class IQuestLoopCoderForCausalLM(IQuestLoopCoderPreTrainedModel, GenerationMixin):
+    _tied_weights_keys = ["lm_head.weight"]
+    _tp_plan = {"lm_head": "colwise_rep"}
+    _pp_plan = {"lm_head": (["hidden_states"], ["logits"])}
+
+    def __init__(self, config):
+        super().__init__(config)
+        self.model = IQuestLoopCoderModel(config)
+        self.vocab_size = config.vocab_size
+        self.lm_head = nn.Linear(config.hidden_size, config.vocab_size, bias=False)
+
+        # 分块大小配置
+        self.chunk_size = getattr(config, "chunk_size", 2)  # 默认分块大小为2
+
+        self.post_init()
+
+    def get_input_embeddings(self):
+        return self.model.embed_tokens
+
+    def set_input_embeddings(self, value):
+        self.model.embed_tokens = value
+
+    def get_output_embeddings(self):
+        return self.lm_head
+
+    def set_output_embeddings(self, new_embeddings):
+        self.lm_head = new_embeddings
+
+    def set_decoder(self, decoder):
+        self.model = decoder
+
+    def get_decoder(self):
+        return self.model
+
+    @can_return_tuple
+    @auto_docstring
+    def forward(
+        self,
+        input_ids: Optional[torch.LongTensor] = None,
+        attention_mask: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.LongTensor] = None,
+        past_key_values: Optional[Cache] = None,
+        inputs_embeds: Optional[torch.FloatTensor] = None,
+        labels: Optional[torch.LongTensor] = None,
+        use_cache: Optional[bool] = None,
+        cache_position: Optional[torch.LongTensor] = None,
+        logits_to_keep: Union[int, torch.Tensor] = 0,
+        **kwargs: Unpack[TransformersKwargs],
+    ) -> CausalLMOutputWithPast:
+
+        outputs, hidden_states_list = self.model(
+            input_ids=input_ids,
+            attention_mask=attention_mask,
+            position_ids=position_ids,
+            past_key_values=past_key_values,
+            inputs_embeds=inputs_embeds,
+            use_cache=use_cache,
+            cache_position=cache_position,
+            **kwargs,
+        )
+        slice_indices = (
+            slice(-logits_to_keep, None)
+            if isinstance(logits_to_keep, int)
+            else logits_to_keep
+        )
+
+        def _select_token_positions(tensor: torch.Tensor) -> torch.Tensor:
+            if isinstance(slice_indices, slice):
+                return tensor[:, slice_indices, ...]
+            if isinstance(slice_indices, torch.Tensor):
+                return tensor.index_select(1, slice_indices.to(tensor.device))
+            raise TypeError(
+                f"Unsupported index type for logits_to_keep: {type(slice_indices)}"
+            )
+
+        stacked_exit_pdf = None
+
+        expected_logits_cache: Optional[torch.Tensor] = None
+
+        def compute_expected_logits() -> Optional[torch.Tensor]:
+            nonlocal expected_logits_cache
+            if expected_logits_cache is not None:
+                return expected_logits_cache
+            if stacked_exit_pdf is None or not hidden_states_list:
+                return None
+            token_exit_pdf = _select_token_positions(stacked_exit_pdf)
+            expected_logits = None
+            for step_idx, hidden in enumerate(hidden_states_list):
+                step_hidden = _select_token_positions(hidden)
+                step_logits = self.lm_head(step_hidden)
+                weight = (
+                    token_exit_pdf[..., step_idx].unsqueeze(-1).to(step_logits.dtype)
+                )
+                expected_logits = (
+                    step_logits * weight
+                    if expected_logits is None
+                    else expected_logits + step_logits * weight
+                )
+            expected_logits_cache = expected_logits
+            return expected_logits_cache
+
+        logits: Optional[torch.Tensor] = None
+        loss: Optional[torch.Tensor] = None
+
+        hidden_states = outputs.last_hidden_state
+        logits = self.lm_head(hidden_states)
+        logits = logits.float()
+
+        if labels is not None:
+            shift_logits = logits[..., :-1, :].contiguous()
+            shift_labels = labels[..., 1:].contiguous()
+            loss_fct = nn.CrossEntropyLoss()
+            shift_logits = shift_logits.view(-1, self.config.vocab_size)
+            shift_labels = shift_labels.view(-1)
+            shift_labels = shift_labels.to(shift_logits.device)
+            loss = loss_fct(shift_logits, shift_labels)
+
+        result = CausalLMOutputWithPast(
+            loss=loss,
+            logits=logits,
+            past_key_values=outputs.past_key_values,
+            hidden_states=outputs.hidden_states,
+            attentions=outputs.attentions,
+        )
+
+        return result

tokenization_iquestcoder.py

@@ -0,0 +1,553 @@
+# IQuest NVFP4 Quantized Model - Official Architecture
+"""Tokenization classes for IQuestCoder."""
+
+import os
+from shutil import copyfile
+from typing import Any, Dict, List, Optional, Tuple, Union
+
+import sentencepiece as spm
+
+from transformers.tokenization_utils import AddedToken, PreTrainedTokenizer
+from transformers.utils import logging
+
+
+logger = logging.get_logger(__name__)
+
+VOCAB_FILES_NAMES = {"vocab_file": "tokenizer.model"}
+
+PRETRAINED_VOCAB_FILES_MAP = {
+    "vocab_file": {},
+    "tokenizer_file": {},
+}
+PRETRAINED_POSITIONAL_EMBEDDINGS_SIZES = {}
+
+
+
+class IQuestCoderTokenizer(PreTrainedTokenizer):
+
+    vocab_files_names = VOCAB_FILES_NAMES
+    pretrained_vocab_files_map = PRETRAINED_VOCAB_FILES_MAP
+    max_model_input_sizes = PRETRAINED_POSITIONAL_EMBEDDINGS_SIZES
+    model_input_names = ["input_ids", "attention_mask"]
+
+    def __init__(
+        self,
+        vocab_file,
+        unk_token="<unk>",
+        bos_token="<s>",
+        eos_token="</s>",
+        pad_token=None,
+        sp_model_kwargs: Optional[Dict[str, Any]] = None,
+        add_bos_token=True,
+        add_eos_token=False,
+        clean_up_tokenization_spaces=False,
+        add_prefix_space=False,
+        legacy=None,
+        use_default_system_prompt=False,
+        chat_template=None,
+        **kwargs,
+    ):
+        self.sp_model_kwargs = {} if sp_model_kwargs is None else sp_model_kwargs
+        bos_token = AddedToken(bos_token, lstrip=False, rstrip=False) if isinstance(bos_token, str) else bos_token
+        eos_token = AddedToken(eos_token, lstrip=False, rstrip=False) if isinstance(eos_token, str) else eos_token
+        unk_token = AddedToken(unk_token, lstrip=False, rstrip=False) if isinstance(unk_token, str) else unk_token
+        pad_token = AddedToken(pad_token, lstrip=False, rstrip=False) if isinstance(pad_token, str) else pad_token
+        
+        # Legacy behavior handling
+        if legacy is None:
+            logger.warning_once(
+                f"You are using the default legacy behaviour of the {self.__class__.__name__}. This is"
+                " expected, and simply means that the `legacy` (previous) behavior will be used so nothing changes for you."
+                " If you want to use the new behaviour, set `legacy=False`. This should only be set if you understand what it"
+                " means, and thoroughly read the reason why this was added as explained in"
+                " https://github.com/huggingface/transformers/pull/24565"
+            )
+            legacy = True
+        
+        self.legacy = legacy
+        self.vocab_file = vocab_file
+        self.add_bos_token = add_bos_token
+        self.add_eos_token = add_eos_token
+        self.add_prefix_space = add_prefix_space
+        self.use_default_system_prompt = use_default_system_prompt
+        self.sp_model = spm.SentencePieceProcessor(**self.sp_model_kwargs)
+        self.sp_model.Load(vocab_file)
+        
+
+        
+        super().__init__(
+            bos_token=bos_token,
+            eos_token=eos_token,
+            unk_token=unk_token,
+            pad_token=pad_token,
+            add_bos_token=add_bos_token,
+            add_eos_token=add_eos_token,
+            sp_model_kwargs=self.sp_model_kwargs,
+            clean_up_tokenization_spaces=clean_up_tokenization_spaces,
+            add_prefix_space=add_prefix_space,
+            legacy=legacy,
+            use_default_system_prompt=use_default_system_prompt,
+            chat_template=chat_template,
+            **kwargs,
+        )
+
+    def __getstate__(self):
+        state = self.__dict__.copy()
+        state["sp_model"] = None
+        return state
+
+    def __setstate__(self, d):
+        self.__dict__ = d
+        self.sp_model = spm.SentencePieceProcessor(**self.sp_model_kwargs)
+        self.sp_model.Load(self.vocab_file)
+
+    @property
+    def vocab_size(self) -> int:
+        """Returns the vocabulary size."""
+        return self.sp_model.get_piece_size()
+
+    def get_vocab(self) -> Dict[str, int]:
+        """Returns the vocabulary as a dictionary of token to index."""
+        vocab = {self.convert_ids_to_tokens(i): i for i in range(self.vocab_size)}
+        vocab.update(self.added_tokens_encoder)
+        return vocab
+
+    def _tokenize(self, text: str) -> List[str]:
+        """
+        Tokenize a string.
+        
+        Args:
+            text (`str`): The text to tokenize.
+            
+        Returns:
+            `List[str]`: The list of tokens.
+        """
+        if self.add_prefix_space:
+            text = " " + text
+            
+        if self.legacy:
+            return self.sp_model.encode(text, out_type=str)
+        
+        # Non-legacy behavior: handle special tokens properly
+        return self.sp_model.encode(text, out_type=str)
+
+    def _convert_token_to_id(self, token: str) -> int:
+        """Converts a token (str) to an id using the vocab."""
+        return self.sp_model.piece_to_id(token)
+
+    def _convert_id_to_token(self, index: int) -> str:
+        """Converts an index (integer) to a token (str) using the vocab."""
+        token = self.sp_model.IdToPiece(index)
+        return token
+
+    def convert_tokens_to_string(self, tokens: List[str]) -> str:
+        """
+        Converts a sequence of tokens (strings) to a single string.
+        
+        This method handles special tokens separately to ensure they are not
+        decoded using the SentencePiece model.
+        
+        Args:
+            tokens (`List[str]`): The list of tokens to convert.
+            
+        Returns:
+            `str`: The decoded string.
+        """
+        current_sub_tokens = []
+        out_string = ""
+        prev_is_special = False
+        for i, token in enumerate(tokens):
+            # make sure that special tokens are not decoded using sentencepiece model
+            if token in self.all_special_tokens:
+                if not prev_is_special and i != 0:
+                    out_string += " "
+                out_string += self.sp_model.decode(current_sub_tokens) + token
+                prev_is_special = True
+                current_sub_tokens = []
+            else:
+                current_sub_tokens.append(token)
+                prev_is_special = False
+        out_string += self.sp_model.decode(current_sub_tokens)
+        return out_string
+
+    def save_vocabulary(self, save_directory: str, filename_prefix: Optional[str] = None) -> Tuple[str]:
+        """
+        Save the vocabulary and special tokens file to a directory.
+        
+        Args:
+            save_directory (`str`):
+                The directory in which to save the vocabulary.
+            filename_prefix (`str`, *optional*):
+                An optional prefix to add to the named of the saved files.
+                
+        Returns:
+            `Tuple(str)`: Paths to the files saved.
+        """
+        if not os.path.isdir(save_directory):
+            logger.error(f"Vocabulary path ({save_directory}) should be a directory")
+            return
+        out_vocab_file = os.path.join(
+            save_directory, (filename_prefix + "-" if filename_prefix else "") + VOCAB_FILES_NAMES["vocab_file"]
+        )
+
+        if os.path.abspath(self.vocab_file) != os.path.abspath(out_vocab_file) and os.path.isfile(self.vocab_file):
+            copyfile(self.vocab_file, out_vocab_file)
+        elif not os.path.isfile(self.vocab_file):
+            with open(out_vocab_file, "wb") as fi:
+                content_spiece_model = self.sp_model.serialized_model_proto()
+                fi.write(content_spiece_model)
+
+        return (out_vocab_file,)
+
+    def build_inputs_with_special_tokens(
+        self, 
+        token_ids_0: List[int], 
+        token_ids_1: Optional[List[int]] = None
+    ) -> List[int]:
+        """
+        Build model inputs from a sequence or a pair of sequences for sequence classification tasks by concatenating
+        and adding special tokens.
+        
+        An IQuestCoder sequence has the following format:
+        
+        - single sequence: `<s> X </s>` (if add_eos_token is True) or `<s> X` (default)
+        - pair of sequences: `<s> A </s> <s> B </s>` (if add_eos_token is True) or `<s> A <s> B` (default)
+        
+        Args:
+            token_ids_0 (`List[int]`):
+                List of IDs to which the special tokens will be added.
+            token_ids_1 (`List[int]`, *optional*):
+                Optional second list of IDs for sequence pairs.
+                
+        Returns:
+            `List[int]`: List of input IDs with the appropriate special tokens.
+        """
+        bos_token_id = [self.bos_token_id] if self.add_bos_token else []
+        eos_token_id = [self.eos_token_id] if self.add_eos_token else []
+
+        output = bos_token_id + token_ids_0 + eos_token_id
+
+        if token_ids_1 is not None:
+            output = output + bos_token_id + token_ids_1 + eos_token_id
+
+        return output
+
+    def get_special_tokens_mask(
+        self, 
+        token_ids_0: List[int], 
+        token_ids_1: Optional[List[int]] = None, 
+        already_has_special_tokens: bool = False
+    ) -> List[int]:
+        """
+        Retrieve sequence ids from a token list that has no special tokens added. This method is called when adding
+        special tokens using the tokenizer `prepare_for_model` method.
+        
+        Args:
+            token_ids_0 (`List[int]`):
+                List of IDs.
+            token_ids_1 (`List[int]`, *optional*):
+                Optional second list of IDs for sequence pairs.
+            already_has_special_tokens (`bool`, *optional*, defaults to `False`):
+                Whether or not the token list is already formatted with special tokens for the model.
+                
+        Returns:
+            `List[int]`: A list of integers in the range [0, 1]: 1 for a special token, 0 for a sequence token.
+        """
+        if already_has_special_tokens:
+            return super().get_special_tokens_mask(
+                token_ids_0=token_ids_0, token_ids_1=token_ids_1, already_has_special_tokens=True
+            )
+
+        bos_token_id = [1] if self.add_bos_token else []
+        eos_token_id = [1] if self.add_eos_token else []
+
+        if token_ids_1 is None:
+            return bos_token_id + ([0] * len(token_ids_0)) + eos_token_id
+        return (
+            bos_token_id
+            + ([0] * len(token_ids_0))
+            + eos_token_id
+            + bos_token_id
+            + ([0] * len(token_ids_1))
+            + eos_token_id
+        )
+
+    def create_token_type_ids_from_sequences(
+        self, 
+        token_ids_0: List[int], 
+        token_ids_1: Optional[List[int]] = None
+    ) -> List[int]:
+        """
+        Create a mask from the two sequences passed to be used in a sequence-pair classification task.
+        
+        An IQuestCoder sequence pair mask has the following format:
+        
+        ```
+        0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1
+        | first sequence    | second sequence |
+        ```
+        
+        If `token_ids_1` is `None`, this method only returns the first portion of the mask (0s).
+        
+        Args:
+            token_ids_0 (`List[int]`):
+                List of IDs.
+            token_ids_1 (`List[int]`, *optional*):
+                Optional second list of IDs for sequence pairs.
+                
+        Returns:
+            `List[int]`: List of token type IDs according to the given sequence(s).
+        """
+        bos_token_id = [self.bos_token_id] if self.add_bos_token else []
+        eos_token_id = [self.eos_token_id] if self.add_eos_token else []
+
+        output = [0] * len(bos_token_id + token_ids_0 + eos_token_id)
+
+        if token_ids_1 is not None:
+            output += [1] * len(bos_token_id + token_ids_1 + eos_token_id)
+
+        return output
+
+    @property
+    def default_chat_template(self) -> str:
+        """
+        Returns the default chat template for IQuestCoder.
+        
+        This template formats conversations with system, user, and assistant roles.
+        """
+        return DEFAULT_CHAT_TEMPLATE
+
+    def apply_chat_template(
+        self,
+        conversation: Union[List[Dict[str, str]], "Conversation"],
+        chat_template: Optional[str] = None,
+        add_generation_prompt: bool = False,
+        tokenize: bool = True,
+        padding: bool = False,
+        truncation: bool = False,
+        max_length: Optional[int] = None,
+        return_tensors: Optional[str] = None,
+        return_dict: bool = False,
+        **tokenizer_kwargs,
+    ):
+        """
+        Apply a chat template to format a conversation.
+        
+        Args:
+            conversation (`List[Dict[str, str]]` or `Conversation`):
+                A list of dicts with "role" and "content" keys, representing the conversation history.
+            chat_template (`str`, *optional*):
+                A Jinja template to use for formatting. If not provided, the tokenizer's default will be used.
+            add_generation_prompt (`bool`, *optional*, defaults to `False`):
+                Whether to add a generation prompt at the end for the assistant to continue.
+            tokenize (`bool`, *optional*, defaults to `True`):
+                Whether to tokenize the output. If `False`, returns a string.
+            padding (`bool`, *optional*, defaults to `False`):
+                Whether to pad sequences.
+            truncation (`bool`, *optional*, defaults to `False`):
+                Whether to truncate sequences.
+            max_length (`int`, *optional*):
+                Maximum length of the output.
+            return_tensors (`str`, *optional*):
+                The type of tensors to return ("pt", "tf", "np", or None).
+            return_dict (`bool`, *optional*, defaults to `False`):
+                Whether to return a dictionary with additional information.
+            **tokenizer_kwargs:
+                Additional keyword arguments passed to the tokenizer.
+                
+        Returns:
+            `Union[str, List[int], BatchEncoding]`: The formatted (and optionally tokenized) conversation.
+            
+        Example:
+            ```python
+            >>> tokenizer = IQuestCoderTokenizer.from_pretrained("path/to/model")
+            >>> conversation = [
+            ...     {"role": "system", "content": "You are a helpful assistant."},
+            ...     {"role": "user", "content": "Hello!"},
+            ...     {"role": "assistant", "content": "Hi there! How can I help you today?"},
+            ...     {"role": "user", "content": "What's the weather like?"},
+            ... ]
+            >>> tokenizer.apply_chat_template(conversation, add_generation_prompt=True, tokenize=False)
+            '<|system|>\\nYou are a helpful assistant.\\n</|system|><|user|>\\nHello!\\n</|user|>...'
+            ```
+        """
+        # Use parent class implementation with our template
+        return super().apply_chat_template(
+            conversation,
+            chat_template=chat_template,
+            add_generation_prompt=add_generation_prompt,
+            tokenize=tokenize,
+            padding=padding,
+            truncation=truncation,
+            max_length=max_length,
+            return_tensors=return_tensors,
+            return_dict=return_dict,
+            **tokenizer_kwargs,
+        )
+
+
+# Try to import and create Fast tokenizer version
+try:
+    from transformers import PreTrainedTokenizerFast
+    from tokenizers import Tokenizer, decoders, models, normalizers, pre_tokenizers, processors
+    
+    class IQuestCoderTokenizerFast(PreTrainedTokenizerFast):
+        """
+        Construct a "fast" IQuestCoder tokenizer (backed by HuggingFace's *tokenizers* library).
+        
+        This is a fast implementation of [`IQuestCoderTokenizer`] using the 🤗 Tokenizers library.
+        
+        Args:
+            vocab_file (`str`, *optional*):
+                Path to the vocabulary file (SentencePiece model).
+            tokenizer_file (`str`, *optional*):
+                Path to a tokenizer JSON file.
+            unk_token (`str`, *optional*, defaults to `"<unk>"`):
+                The unknown token.
+            bos_token (`str`, *optional*, defaults to `"<s>"`):
+                The beginning of sequence token.
+            eos_token (`str`, *optional*, defaults to `"</s>"`):
+                The end of sequence token.
+            pad_token (`str`, *optional*):
+                The token used for padding.
+            add_bos_token (`bool`, *optional*, defaults to `True`):
+                Whether to add a BOS token at the start of sequences.
+            add_eos_token (`bool`, *optional*, defaults to `False`):
+                Whether to add an EOS token at the end of sequences.
+            add_prefix_space (`bool`, *optional*, defaults to `False`):
+                Whether to add an initial space to the input.
+            use_default_system_prompt (`bool`, *optional*, defaults to `False`):
+                Whether to use the default system prompt.
+            chat_template (`str`, *optional*):
+                A Jinja template for formatting conversations.
+                
+        Example:
+            ```python
+            >>> from tokenization_iquestcoder import IQuestCoderTokenizerFast
+            
+            >>> tokenizer = IQuestCoderTokenizerFast.from_pretrained("path/to/model")
+            >>> tokenizer.encode("Hello, world!")
+            [1, 15043, 29892, 3186, 29991]
+            ```
+        """
+        
+        vocab_files_names = VOCAB_FILES_NAMES
+        pretrained_vocab_files_map = PRETRAINED_VOCAB_FILES_MAP
+        max_model_input_sizes = PRETRAINED_POSITIONAL_EMBEDDINGS_SIZES
+        model_input_names = ["input_ids", "attention_mask"]
+        slow_tokenizer_class = IQuestCoderTokenizer
+        
+        def __init__(
+            self,
+            vocab_file=None,
+            tokenizer_file=None,
+            unk_token="<unk>",
+            bos_token="<s>",
+            eos_token="</s>",
+            pad_token=None,
+            add_bos_token=True,
+            add_eos_token=False,
+            add_prefix_space=False,
+            use_default_system_prompt=False,
+            chat_template=None,
+            **kwargs,
+        ):
+            self.add_bos_token = add_bos_token
+            self.add_eos_token = add_eos_token
+            self.add_prefix_space = add_prefix_space
+            self.use_default_system_prompt = use_default_system_prompt
+            
+            if chat_template is None:
+                chat_template = DEFAULT_CHAT_TEMPLATE
+            
+            super().__init__(
+                vocab_file=vocab_file,
+                tokenizer_file=tokenizer_file,
+                unk_token=unk_token,
+                bos_token=bos_token,
+                eos_token=eos_token,
+                pad_token=pad_token,
+                add_bos_token=add_bos_token,
+                add_eos_token=add_eos_token,
+                add_prefix_space=add_prefix_space,
+                use_default_system_prompt=use_default_system_prompt,
+                chat_template=chat_template,
+                **kwargs,
+            )
+        
+        @property
+        def can_save_slow_tokenizer(self) -> bool:
+            return os.path.isfile(self.vocab_file) if self.vocab_file else False
+        
+        @property
+        def default_chat_template(self) -> str:
+            """Returns the default chat template."""
+            return DEFAULT_CHAT_TEMPLATE
+        
+        def build_inputs_with_special_tokens(
+            self, 
+            token_ids_0: List[int], 
+            token_ids_1: Optional[List[int]] = None
+        ) -> List[int]:
+            """Build model inputs with special tokens."""
+            bos_token_id = [self.bos_token_id] if self.add_bos_token else []
+            eos_token_id = [self.eos_token_id] if self.add_eos_token else []
+
+            output = bos_token_id + token_ids_0 + eos_token_id
+
+            if token_ids_1 is not None:
+                output = output + bos_token_id + token_ids_1 + eos_token_id
+
+            return output
+        
+        def get_special_tokens_mask(
+            self, 
+            token_ids_0: List[int], 
+            token_ids_1: Optional[List[int]] = None, 
+            already_has_special_tokens: bool = False
+        ) -> List[int]:
+            """Retrieve special tokens mask."""
+            if already_has_special_tokens:
+                return super().get_special_tokens_mask(
+                    token_ids_0=token_ids_0, token_ids_1=token_ids_1, already_has_special_tokens=True
+                )
+
+            bos_token_id = [1] if self.add_bos_token else []
+            eos_token_id = [1] if self.add_eos_token else []
+
+            if token_ids_1 is None:
+                return bos_token_id + ([0] * len(token_ids_0)) + eos_token_id
+            return (
+                bos_token_id
+                + ([0] * len(token_ids_0))
+                + eos_token_id
+                + bos_token_id
+                + ([0] * len(token_ids_1))
+                + eos_token_id
+            )
+        
+        def create_token_type_ids_from_sequences(
+            self, 
+            token_ids_0: List[int], 
+            token_ids_1: Optional[List[int]] = None
+        ) -> List[int]:
+            """Create token type IDs from sequences."""
+            bos_token_id = [self.bos_token_id] if self.add_bos_token else []
+            eos_token_id = [self.eos_token_id] if self.add_eos_token else []
+
+            output = [0] * len(bos_token_id + token_ids_0 + eos_token_id)
+
+            if token_ids_1 is not None:
+                output += [1] * len(bos_token_id + token_ids_1 + eos_token_id)
+
+            return output
+
+except ImportError:
+    # tokenizers library not available, Fast tokenizer not supported
+    IQuestCoderTokenizerFast = None
+    logger.info(
+        "The `tokenizers` library is not installed. "
+        "IQuestCoderTokenizerFast will not be available. "
+        "Install it with `pip install tokenizers`."
+    )
+

tokenizer.model

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:7d3be68e090a927f31e0e378d7599b15c206dd47e4a73933775a746cc9c1cd91
+size 1345108

tokenizer_config.json

@@ -0,0 +1,242 @@
+{
+  "add_bos_token": false,
+  "add_eos_token": false,
+  "added_tokens_decoder": {
+    "0": {
+      "content": "<unk>",
+      "lstrip": false,
+      "normalized": true,
+      "rstrip": false,
+      "single_word": true,
+      "special": true
+    },
+    "1": {
+      "content": "<s>",
+      "lstrip": false,
+      "normalized": true,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "2": {
+      "content": "</s>",
+      "lstrip": false,
+      "normalized": true,
+      "rstrip": false,
+      "single_word": true,
+      "special": true
+    },
+    "75858": {
+      "content": "<CLS>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "75859": {
+      "content": "<SEP>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "75860": {
+      "content": "<EOD>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "75861": {
+      "content": "<MASK>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "75862": {
+      "content": "<PAD>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "75863": {
+      "content": "<|im_start|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "75864": {
+      "content": "<|im_end|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "75865": {
+      "content": "<|fim_prefix|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "75866": {
+      "content": "<|fim_middle|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "75867": {
+      "content": "<|fim_suffix|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "75868": {
+      "content": "<|fim_pad|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "75869": {
+      "content": "<|endoftext|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "75870": {
+      "content": "<|repo_name|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "75871": {
+      "content": "<|file_sep|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "75872": {
+      "content": "<think>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "75873": {
+      "content": "</think>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "75874": {
+      "content": "<tools>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "75875": {
+      "content": "</tools>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "75876": {
+      "content": "<tool_call>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "75877": {
+      "content": "</tool_call>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "75878": {
+      "content": "<tool_response>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "75879": {
+      "content": "</tool_response>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    }
+  },
+  "additional_special_tokens": [
+    "<|CLS|>",
+    "<|SEP|>",
+    "<|EOD|>",
+    "<|MASK|>",
+    "<|PAD|>",
+    "<|fim_prefix|>",
+    "<|fim_middle|>",
+    "<|fim_suffix|>",
+    "<|im_start|>",
+    "<|im_end|>",
+    "<|fim_pad|>",
+    "<|endoftext|>",
+    "<|repo_name|>",
+    "<|file_sep|>",
+    "<think>",
+    "</think>"
+  ],
+  "auto_map": {
+    "AutoTokenizer": [
+      "tokenization_iquestcoder.IQuestCoderTokenizer",
+      null
+    ]
+  },
+  "bos_token": "<s>",
+  "chat_template": "{%- if tools %}\n    {{- '<|im_start|>system\\n' }}\n    {%- if messages[0].role == 'system' %}\n        {{- messages[0].content + '\\n\\n' }}\n    {%- else %}\n        {{- 'You are LoopCoder, a helpful assistant developed by IQuest.' }}\n    {%- endif %}\n    {{- \"# Tools\\n\\nYou may call one or more functions to assist with the user query.\\n\\nYou are provided with function signatures within <tools></tools> XML tags:\\n<tools>\" }}\n    {%- for tool in tools %}\n        {{- \"\\n\" }}\n        {{- tool | tojson }}\n    {%- endfor %}\n    {{- \"\\n</tools>\\n\\nFor each function call, return a json object with function name and arguments within <tool_call></tool_call> XML tags:\\n<tool_call>\\n{\\\"name\\\": <function-name>, \\\"arguments\\\": <args-json-object>}\\n</tool_call><|im_end|>\\n\" }}\n{%- else %}\n    {%- if messages[0].role == 'system' %}\n        {{- '<|im_start|>system\\n' + messages[0].content + '<|im_end|>\\n' }}\n    {%- else %}\n        {{- '<|im_start|>system\\nYou are LoopCoder, a helpful assistant developed by IQuest.<|im_end|>\\n' }}\n    {%- endif %}\n{%- endif %}\n{%- set ns = namespace(multi_step_tool=true, last_query_index=messages|length - 1) %}\n{%- for message in messages[::-1] %}\n    {%- set index = (messages|length - 1) - loop.index0 %}\n    {%- if ns.multi_step_tool and message.role == \"user\" and not(message.content.startswith('<tool_response>') and message.content.endswith('</tool_response>')) %}\n        {%- set ns.multi_step_tool = false %}\n        {%- set ns.last_query_index = index %}\n    {%- endif %}\n{%- endfor %}\n{%- for message in messages %}\n    {%- if (message.role == \"user\") or (message.role == \"system\" and not loop.first) %}\n        {{- '<|im_start|>' + message.role + '\\n' + message.content + '<|im_end|>' + '\\n' }}\n    {%- elif message.role == \"assistant\" %}\n        {%- set content = message.content %}\n        {{- '<|im_start|>' + message.role + '\\n' + content }}\n        {%- if message.tool_calls %}\n            {%- for tool_call in message.tool_calls %}\n                {%- if (loop.first and content) or (not loop.first) %}\n                    {{- '\\n' }}\n                {%- endif %}\n                {%- if tool_call.function %}\n                    {%- set tool_call = tool_call.function %}\n                {%- endif %}\n                {{- '<tool_call>\\n{\"name\": \"' }}\n                {{- tool_call.name }}\n                {{- '\", \"arguments\": ' }}\n                {%- if tool_call.arguments is string %}\n                    {{- tool_call.arguments }}\n                {%- else %}\n                    {{- tool_call.arguments | tojson }}\n                {%- endif %}\n                {{- '}\\n</tool_call>' }}\n            {%- endfor %}\n        {%- endif %}\n        {{- '<|im_end|>\\n' }}\n    {%- elif message.role == \"tool\" %}\n        {%- if loop.first or (messages[loop.index0 - 1].role != \"tool\") %}\n            {{- '<|im_start|>user' }}\n        {%- endif %}\n        {{- '\\n<tool_response>\\n' }}\n        {{- message.content }}\n        {{- '\\n</tool_response>' }}\n        {%- if loop.last or (messages[loop.index0 + 1].role != \"tool\") %}\n            {{- '<|im_end|>\\n' }}\n        {%- endif %}\n    {%- endif %}\n{%- endfor %}\n{%- if add_generation_prompt %}\n    {{- '<|im_start|>assistant\\n' }}\n{%- endif %}",
+  "clean_up_tokenization_spaces": false,
+  "eos_token": "<|im_end|>",
+  "model_max_length": 16384,
+  "pad_token": "<|endoftext|>",
+  "padding_side": "right",
+  "sp_model_kwargs": {},
+  "split_special_tokens": false,
+  "tokenizer_class": "IQuestCoderTokenizer",
+  "unk_token": "<unk>",
+  "use_fast": false
+}