Soonhwan-Kwon commented on issue #11580: fix BucketSentenceIter bug related to 
#11430
URL: https://github.com/apache/incubator-mxnet/pull/11580#issuecomment-404058398
 
 
   @szha I added test case , by adding smallest empty bucket, and it reproduces 
error in previous rnn/io.py version and it works good in patched version.
   
   below is the reproduced error.
   Traceback (most recent call last):
     File "test_bucketing.py", line 110, in <module>
       test_bucket_module()
     File "test_bucketing.py", line 102, in test_bucket_module
       batch_end_callback=mx.callback.Speedometer(batch_size, 50))
     File 
"/home/ubuntu/anaconda3/envs/mxnet_p27/lib/python2.7/site-packages/mxnet-1.3.0-py2.7.egg/mxnet/module/base_module.py",
 line 515, in fit
       self.forward_backward(data_batch)
     File 
"/home/ubuntu/anaconda3/envs/mxnet_p27/lib/python2.7/site-packages/mxnet-1.3.0-py2.7.egg/mxnet/module/base_module.py",
 line 194, in forward_backward
       self.forward(data_batch, is_train=True)
     File 
"/home/ubuntu/anaconda3/envs/mxnet_p27/lib/python2.7/site-packages/mxnet-1.3.0-py2.7.egg/mxnet/module/bucketing_module.py",
 line 455, in forward
       data_batch.provide_label)
     File 
"/home/ubuntu/anaconda3/envs/mxnet_p27/lib/python2.7/site-packages/mxnet-1.3.0-py2.7.egg/mxnet/module/bucketing_module.py",
 line 376, in switch_bucket
       force_rebind=False, 
shared_module=self._buckets[self._default_bucket_key])
     File 
"/home/ubuntu/anaconda3/envs/mxnet_p27/lib/python2.7/site-packages/mxnet-1.3.0-py2.7.egg/mxnet/module/module.py",
 line 430, in bind
       state_names=self._state_names)
     File 
"/home/ubuntu/anaconda3/envs/mxnet_p27/lib/python2.7/site-packages/mxnet-1.3.0-py2.7.egg/mxnet/module/executor_group.py",
 line 279, in __init__
       self.bind_exec(data_shapes, label_shapes, shared_group)
     File 
"/home/ubuntu/anaconda3/envs/mxnet_p27/lib/python2.7/site-packages/mxnet-1.3.0-py2.7.egg/mxnet/module/executor_group.py",
 line 375, in bind_exec
       shared_group))
     File 
"/home/ubuntu/anaconda3/envs/mxnet_p27/lib/python2.7/site-packages/mxnet-1.3.0-py2.7.egg/mxnet/module/executor_group.py",
 line 662, in _bind_ith_exec
       shared_buffer=shared_data_arrays, **input_shapes)
     File 
"/home/ubuntu/anaconda3/envs/mxnet_p27/lib/python2.7/site-packages/mxnet-1.3.0-py2.7.egg/mxnet/symbol/symbol.py",
 line 1528, in simple_bind
       raise RuntimeError(error_msg)
   RuntimeError: simple_bind error. Arguments:
   data: (128, 20L)
   softmax_label: (128, 20L)
   Error in operator split0: [06:10:03] src/operator/./slice_channel-inl.h:216: 
Check failed: ishape[real_axis] == static_cast<size_t>(param_.num_outputs) (20 
vs. 10) If squeeze axis is True, the size of the sliced axis must be the same 
as num_outputs. Input shape=[128,20,25], axis=1, num_outputs=10.

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