Update default sample size (#11)

- update default sample size (d926f260cdaa9c357a3deb95344a44021dcb9d91)

transformer/config.json

@@ -11,5 +11,5 @@
   "out_channels": 16,
   "patch_size": 2,
   "pooled_projection_dim": 2048,
-  "sample_size": 128
+  "sample_size": 64
 }