Fix typo

examples/run_openai_gpt.py

@@ -163,7 +163,7 @@ def main():
     datasets = (train_dataset, eval_dataset)
     encoded_datasets = tokenize_and_encode(datasets)
 
-    # Compute the mex input length for the Transformer
+    # Compute the max input length for the Transformer
     max_length = model.config.n_positions // 2 - 2
     input_length = max(len(story[:max_length]) + max(len(cont1[:max_length]), len(cont2[:max_length])) + 3  \
                            for dataset in encoded_datasets for story, cont1, cont2, _ in dataset)