[GitHub] [incubator-mxnet] sxjscience opened a new issue #16279: [Bug] Inconsistency between HybridBlock and Block

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

sxjscience opened a new issue #16279: [Bug] Inconsistency between HybridBlock and Block
URL: https://github.com/apache/incubator-mxnet/issues/16279
 
 
   There are lots of operators that have inconsistent behaviors between hybridized and not-hybridized versions.
   
   ```python
   import mxnet as mx
   from mxnet.gluon import HybridBlock
   
   class Foo2(HybridBlock):
       def hybrid_forward(self, F, a):
           return a[0]
   
   
   b1 = Foo2(prefix='hybridized')
   b1.hybridize()
   b2 = Foo2(prefix='no_hybrid')
   
   out1 = b1(mx.nd.ones((10,)))
   out2 = b2(mx.nd.ones((10,)))
   print(out1)
   print(out2)
   
   ```
   ```log
   [1. 1. 1. 1. 1. 1. 1. 1. 1. 1.]
   <NDArray 10 @cpu(0)>
   
   [1.]
   <NDArray 1 @cpu(0)>
   ```
   
   Even if we use the `numpy` interface, the following code cannot  run:
   
   ```python
   import mxnet as mx
   from mxnet.gluon import HybridBlock
   mx.npx.set_np()
   
   
   class Foo2(HybridBlock):
       def hybrid_forward(self, F, a):
           return a[0]
   
   
   b1 = Foo2(prefix='hybridized')
   b1.hybridize()
   b2 = Foo2(prefix='no_hybrid')
   
   out1 = b1(mx.np.ones((10,)))
   out2 = b2(mx.np.ones((10,)))
   print(out1)
   print(out2)
   ```
   
   ```log
         6 class Foo2(HybridBlock):
         7     def hybrid_forward(self, F, a):
   ----> 8         return a[0]
         9 
        10 
   
   ~/mxnet/python/mxnet/symbol/numpy/_symbol.py in __getitem__(self, key)
        49         num_outputs = _num_outputs(self)
        50         if num_outputs == 1:
   ---> 51             raise NotImplementedError
        52         if not isinstance(key, int):
        53             raise NotImplementedError
   
   NotImplementedError: 
   ```

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