@sandeep-krishnamurthy  @zhreshold 

Here's a specific example from the Nightly Binary test which just failed:

StraightDope: Python2 Single-GPU]
[StraightDope: Python2 Single-GPU]
[StraightDope: Python2 Single-GPU] IndexErrorTraceback (most recent call last)
[StraightDope: Python2 Single-GPU] <ipython-input-8-d40071ee971d> in <module>()
[StraightDope: Python2 Single-GPU]      20     train_data.reset()
[StraightDope: Python2 Single-GPU]      21     iter = 0
[StraightDope: Python2 Single-GPU] ---> 22     for batch in train_data:
[StraightDope: Python2 Single-GPU]      23         ############################
[StraightDope: Python2 Single-GPU]      24         # (1) Update D network: 
maximize log(D(x)) + log(1 - D(G(z)))
[StraightDope: Python2 Single-GPU]
[StraightDope: Python2 Single-GPU] /work/mxnet/python/mxnet/io/io.pyc in 
next(self)
[StraightDope: Python2 Single-GPU]     678             raise StopIteration
[StraightDope: Python2 Single-GPU]     679         data = self.getdata()
[StraightDope: Python2 Single-GPU] --> 680         label = self.getlabel()
[StraightDope: Python2 Single-GPU]     681         # iter should stop when last 
batch is not complete
[StraightDope: Python2 Single-GPU]     682         if data[0].shape[0] != 
self.batch_size:
[StraightDope: Python2 Single-GPU]
[StraightDope: Python2 Single-GPU] /work/mxnet/python/mxnet/io/io.pyc in 
getlabel(self)
[StraightDope: Python2 Single-GPU]     748     def getlabel(self):
[StraightDope: Python2 Single-GPU]     749         """Get label."""
[StraightDope: Python2 Single-GPU] --> 750         return 
self._batchify(self.label)
[StraightDope: Python2 Single-GPU]     751
[StraightDope: Python2 Single-GPU]     752     def getpad(self):
[StraightDope: Python2 Single-GPU]
[StraightDope: Python2 Single-GPU] /work/mxnet/python/mxnet/io/io.pyc in 
_batchify(self, data_source)
[StraightDope: Python2 Single-GPU]     730             self.cursor + 
self.batch_size > self.num_data:
[StraightDope: Python2 Single-GPU]     731             pad = self.batch_size - 
self.num_data + self.cursor
[StraightDope: Python2 Single-GPU] --> 732             first_data = 
self._getdata(data_source, start=self.cursor)
[StraightDope: Python2 Single-GPU]     733             second_data = 
self._getdata(data_source, end=pad)
[StraightDope: Python2 Single-GPU]     734             return 
self._concat(first_data, second_data)
[StraightDope: Python2 Single-GPU]
[StraightDope: Python2 Single-GPU] /work/mxnet/python/mxnet/io/io.pyc in 
_getdata(self, data_source, start, end)
[StraightDope: Python2 Single-GPU]     692         assert start is not None or 
end is not None, 'should at least specify start or end'
[StraightDope: Python2 Single-GPU]     693         start = start if start is 
not None else 0
[StraightDope: Python2 Single-GPU] --> 694         end = end if end is not None 
else data_source[0][1].shape[0]
[StraightDope: Python2 Single-GPU]     695         s = slice(start, end)
[StraightDope: Python2 Single-GPU]     696         return [
[StraightDope: Python2 Single-GPU]
[StraightDope: Python2 Single-GPU] IndexError: list index out of range
[StraightDope: Python2 Single-GPU] IndexError: list index out of range
[StraightDope: Python2 Single-GPU]

http://jenkins.mxnet-ci.amazon-ml.com/job/NightlyTests_onBinaries/148/console

The two notebooks are from The Straight Dope book that both repro the out of 
bounds error:
chapter14_generative-adversarial-networks/dcgan and
chapter14_generative-adversarial-networks/pixel2pixel available at
https://github.com/zackchase/mxnet-the-straight-dope

Vishaal

[ Full content available at: 
https://github.com/apache/incubator-mxnet/issues/12526 ]
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