[GitHub] szha commented on issue #7293: test_gluon_rnn.test_rnn_cells hang

[gi...@git.apache.org]

szha commented on issue #7293: test_gluon_rnn.test_rnn_cells hang
URL: https://github.com/apache/incubator-mxnet/issues/7293#issuecomment-319567087
 
 
   It indeed takes a lot longer for `nosetests -v unittest` to run through `test_gluon_rnn.test_rnn_cells` than for `nosetests -v unittest/test_gluon_rnn.py`. I have the same experience running it on my laptop.
   
   The codes that this test is stuck at is the first invocation of the following function:
   ```
   def check_rnn_forward(layer, inputs):
       layer.collect_params().initialize()
       with mx.autograd.record():
           layer.unroll(3, inputs, merge_outputs=True)[0].backward()
           mx.autograd.backward(layer.unroll(3, inputs, merge_outputs=False)[0])
       mx.nd.waitall()
   ```
   By printing my way through the codes, it seems to be stuck at `mx.nd.waitall()` after it successfully exits the autograd.record(). I'm at a loss. @piiswrong what's your guess?
 
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