Correct maximum positional embeddings

config.json

@@ -28,7 +28,7 @@
   "initializer_range": 0.02,
   "intermediate_size": null,
   "layer_norm_epsilon": 1e-05,
-  "max_position_embeddings": 2048,
+  "max_position_embeddings": 512,
   "model_type": "gpt_neo",
   "num_heads": 16,
   "num_layers": 4,