[GitHub] leezu commented on issue #13100: Hybridization generates superfluous backward ops that may induce storage fallbacks

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

leezu commented on issue #13100: Hybridization generates superfluous backward ops that may induce storage fallbacks 
URL: https://github.com/apache/incubator-mxnet/issues/13100#issuecomment-435568020
 
 
   Also note that adding `F.dot(F.BlockGrad(csr.square()), rsp)` will avoid the storage fallback on CPU.
   On GPU, adding F.BlockGrad will induce the following error message:
   
   ```
   
   [07:42:34] src/engine/engine.cc:55: MXNet start using engine: NaiveEngine
   Traceback (most recent call last):
     File "bug.py", line 17, in <module>
       l = net(csr, rsp)
     File "/home/ubuntu/mxnet/python/mxnet/gluon/block.py", line 542, in __call__
       out = self.forward(*args)
     File "/home/ubuntu/mxnet/python/mxnet/gluon/block.py", line 909, in forward
       return self._call_cached_op(x, *args)
     File "/home/ubuntu/mxnet/python/mxnet/gluon/block.py", line 815, in _call_cached_op
       out = self._cached_op(*cargs)
     File "/home/ubuntu/mxnet/python/mxnet/_ctypes/ndarray.py", line 150, in __call__
       ctypes.byref(out_stypes)))
     File "/home/ubuntu/mxnet/python/mxnet/base.py", line 253, in check_call
       raise MXNetError(py_str(_LIB.MXGetLastError()))
   mxnet.base.MXNetError: [07:42:38] src/operator/tensor/././cast_storage-inl.cuh:606: Check failed: ctx.requested.size() > 0 (0 vs. 0)
   ```

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