[GitHub] CXMA479 commented on issue #8663: terminate called after throwing an instance of 'std::out_of_range?

[GitBox <gi...@apache.org>]

CXMA479 commented on issue #8663: terminate called after throwing an instance of 'std::out_of_range?
URL: https://github.com/apache/incubator-mxnet/issues/8663#issuecomment-354301365
 
 
   similar problem has been spotted, as i tried to execute some code like this:
   **Version 0.11.1**
   
   ```python
   def gen_sym(seq_len):
       data=mx.sym.Variable('data')
       label = mx.sym.Variable('label')  # NT
       output, _ = stack.unroll(seq_len, inputs=data, merge_outputs=False, layout='NT')
       pred = output[seq_len-1]
       pred = mx.sym.reshape(pred, shape=(batch_size,-1))
       pred_e = mx.sym.FullyConnected(data= pred, num_hidden=1)
       sym = mx.sym.broadcast_add(pred_e, label)
       sym = mx.sym.MakeLoss(sym)
       return sym, ('data', ), ('label', )
   ```
   However, if i replace `pred_e` with `pred` in *broadcast_add* it works fine
   
   # Error info
   ```
   terminate called after throwing an instance of 'std::out_of_range'
     what():  _Map_base::at
   Aborted (core dumped)
   ```
   
   The point where this error occurs seems to be unpredictable. It could be thrown out before executing `forward` or after several loops of `update`
   I added one line to print in the **1st** line of the `forward_backward` function in `base_module.py`, some results were like this:
   ```shell
   ################## SAMPLE 1  ######################
   $ python main.py 
   WARNING: discarded 0 sentences longer than the largest bucket.
   WARNING: discarded 0 sentences longer than the largest bucket.
   begin one forward_backward, data_batch shape: (10L, 9L)
   begin one forward_backward, data_batch shape: (10L, 9L)
   begin one forward_backward, data_batch shape: (10L, 9L)
   [xxxx-xx-xx 21:19:07,066] {/usr/local/lib/python2.7/dist-packages/mxnet-0.11.1-py2.7.egg/mxnet/callback.py:166} INFO - Epoch[0] Batch [2]	Speed: 188.98 samples/sec	mse=0.329261
   begin one forward_backward, data_batch shape: (10L, 9L)
   begin one forward_backward, data_batch shape: (10L, 9L)
   terminate called after throwing an instance of 'std::out_of_range'
     what():  _Map_base::at
   Aborted (core dumped)
   ################## SAMPLE 2  ######################
   $ python main.py 
   WARNING: discarded 0 sentences longer than the largest bucket.
   WARNING: discarded 0 sentences longer than the largest bucket.
   begin one forward_backward, data_batch shape: (10L, 6L)
   terminate called after throwing an instance of 'std::out_of_range'
     what():  _Map_base::at
   Aborted (core dumped)
   ```

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