marcoabreu commented on a change in pull request #10435: [MXNET-289] Allow 
specifying number of batches to run in an epoch to fix hang in dist sync for 
last epoch
URL: https://github.com/apache/incubator-mxnet/pull/10435#discussion_r179961212
 
 

 ##########
 File path: python/mxnet/module/base_module.py
 ##########
 @@ -511,9 +514,12 @@ def fit(self, train_data, eval_data=None, 
eval_metric='acc',
                 self.forward_backward(data_batch)
                 self.update()
                 try:
-                    # pre fetch next batch
-                    next_data_batch = next(data_iter)
-                    self.prepare(next_data_batch, 
sparse_row_id_fn=sparse_row_id_fn)
+                    if epoch_size and (nbatch == epoch_size - 1):
 
 Review comment:
   I see, thanks for elaborating :)

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