stu1130 commented on a change in pull request #12131: [MXNET-737][WIP] Add last 
batch handle for imageiter
URL: https://github.com/apache/incubator-mxnet/pull/12131#discussion_r210325874
 
 

 ##########
 File path: python/mxnet/image/image.py
 ##########
 @@ -1149,22 +1158,44 @@ def __init__(self, batch_size, data_shape, 
label_width=1,
         else:
             self.auglist = aug_list
         self.cur = 0
+        self._is_allowed_reading = True
+        self._cached_data = None
+        # handle the last batch
+        if self.seq and last_batch == 'discard':
+            new_seq_n = len(self.seq) - len(self.seq) % batch_size
+            self.seq = self.seq[:new_seq_n]
 
 Review comment:
   According to 
[NDArrayIter](https://mxnet.incubator.apache.org/_modules/mxnet/io.html#NDArrayIter),
 it shuffled only during the initialization. But you are right. We should 
shuffle for each epoch.

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