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From Alfredo Luque <alfredo.lu...@airbnb.com.INVALID>
Subject Regressions in NDArrayIter
Date Wed, 12 Sep 2018 01:05:09 GMT
Looks like https://github.com/apache/incubator-mxnet/pull/12285 broke a ton
of our test cases iterating over 3D NDArray instances (eg; MNIST) by
creating an index out of range.

Stacktrace:

.com/airbnb/bighead/python/bighead/ml_frameworks/mxnet/gluon.py", line
434, in transform
    for batch in data_iter:
  File "/anaconda3/envs/py36/lib/python3.6/site-packages/mxnet/io/io.py",
line 228, in __next__
    return self.next()
  File "/anaconda3/envs/py36/lib/python3.6/site-packages/mxnet/io/io.py",
line 680, in next
    label = self.getlabel()
  File "/anaconda3/envs/py36/lib/python3.6/site-packages/mxnet/io/io.py",
line 750, in getlabel
    return self._batchify(self.label)
  File "/anaconda3/envs/py36/lib/python3.6/site-packages/mxnet/io/io.py",
line 732, in _batchify
    first_data = self._getdata(data_source, start=self.cursor)
  File "/anaconda3/envs/py36/lib/python3.6/site-packages/mxnet/io/io.py",
line 694, in _getdata
    end = end if end is not None else data_source[0][1].shape[0]
IndexError: list index out of range

I’ve created an issue at
https://github.com/apache/incubator-mxnet/issues/12526


We’ll be pinning to the previous build until it’s reverted/patched, but let
us know if we can help provide more regression tests here.

—
Alfredo Luque
Software Engineer
Machine Learning Infrastructure
Airbnb
San Francisco, CA

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