[GitHub] lostella commented on issue #12795: Deserialization problem with gluon `ValueError: There are multiple outputs with name ...`

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

lostella commented on issue #12795: Deserialization problem with gluon `ValueError: There are multiple outputs with name ...`
URL: https://github.com/apache/incubator-mxnet/issues/12795#issuecomment-429003322
 
 
   Looks like the problem occurs with `Dense` as well, so the issue probably lies in the `+`:
   
   ```
   import mxnet as mx
   
   class MyBlock(mx.gluon.HybridBlock):
       def __init__(self):
           super().__init__()
           with self.name_scope():
               self.model = mx.gluon.nn.Dense(units=5)
   
       def hybrid_forward(self, F, x, y):
           return self.model(x) + self.model(y)
   
   block = MyBlock()
   block.initialize()
   block.hybridize()
   
   output = block(mx.nd.random_normal(shape=(100,)), mx.nd.random_normal(shape=(100,)))
   
   block.export(path="./model", epoch=0)
   symbol = mx.gluon.SymbolBlock.imports(
       symbol_file="./model-symbol.json",
       input_names=["data0", "data1"],
       param_file="./model-0000.params",
       ctx=mx.Context.default_ctx
   )
   ```
   
   gives
   
   ```
   Traceback (most recent call last):
     File "2018-10-11-very-weird-issue.py", line 23, in <module>
       ctx=mx.Context.default_ctx
     File "[...]/lib/python3.6/site-packages/mxnet/gluon/block.py", line 1023, in imports
       ret = SymbolBlock(sym, inputs)
     File "[...]/lib/python3.6/site-packages/mxnet/gluon/block.py", line 1051, in __init__
       for j in i.get_internals():
     File "[...]/lib/python3.6/site-packages/mxnet/symbol/symbol.py", line 93, in <genexpr>
       return (self[i] for i in self.list_outputs())
     File "[...]/lib/python3.6/site-packages/mxnet/symbol/symbol.py", line 517, in __getitem__
       raise ValueError('There are multiple outputs with name \"%s\"' % index)
   ValueError: There are multiple outputs with name "myblock0_dense0_fwd_output"
   ```

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