add option mentioned in #940

examples/run_squad.py

@@ -272,6 +272,9 @@ def evaluate(args, model, tokenizer, prefix=""):
 
 
 def load_and_cache_examples(args, tokenizer, evaluate=False, output_examples=False):
+    if args.local_rank not in [-1, 0]:
+        torch.distributed.barrier()  # Make sure only the first process in distributed training process the dataset, and the others will use the cache
+
     # Load data features from cache or dataset file
     input_file = args.predict_file if evaluate else args.train_file
     cached_features_file = os.path.join(os.path.dirname(input_file), 'cached_{}_{}_{}'.format(
@@ -296,6 +299,9 @@ def load_and_cache_examples(args, tokenizer, evaluate=False, output_examples=Fal
             logger.info("Saving features into cached file %s", cached_features_file)
             torch.save(features, cached_features_file)
 
+    if args.local_rank == 0:
+        torch.distributed.barrier()  # Make sure only the first process in distributed training process the dataset, and the others will use the cache
+
     # Convert to Tensors and build dataset
     all_input_ids = torch.tensor([f.input_ids for f in features], dtype=torch.long)
     all_input_mask = torch.tensor([f.input_mask for f in features], dtype=torch.long)