Exported fcn_resnet50_voc model has duplicate layer names

It seems that when exporting the fcn_resnet50_voc model, it causes duplicate layer names in all of the Activation layers. This causes issues with using this network in MXNet since sym.get_internals() will fail when there are duplicate names.

Example of duplicate names:

{
      "op": "Activation", 
      "name": "fcn0_resnetv1b0_layers1_relu1_fwd", 
      "attrs": {"act_type": "relu"}, 
      "inputs": [[65, 0, 0]]
}, 

and

{
      "op": "Activation", 
      "name": "fcn0_resnetv1b0_layers1_relu1_fwd", 
      "attrs": {"act_type": "relu"}, 
      "inputs": [[56, 0, 0]]
}

Here is the issue when I try to call get_internals.

ValueError: There are multiple outputs with name "fcn0_resnetv1b0_layers1_relu0_fwd_output"

[wfus]

I was able to fix it by just directly modifying the .json file containing the model definition after exporting it. Then after reloading the new model file everything works.

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