Remove unnecessary epoch variable

examples/run_lm_finetuning.py

@@ -245,7 +245,7 @@ def train(args, train_dataset, model, tokenizer):
     model.zero_grad()
     train_iterator = trange(epochs_trained, int(args.num_train_epochs), desc="Epoch", disable=args.local_rank not in [-1, 0])
     set_seed(args)  # Added here for reproducibility (even between python 2 and 3)
-    for epoch in train_iterator:
+    for _ in train_iterator:
         epoch_iterator = tqdm(train_dataloader, desc="Iteration", disable=args.local_rank not in [-1, 0])
         for step, batch in enumerate(epoch_iterator):