Issue with deeplab_resnet101_coco model

[gmalivenko]

Hello there!

This issue is related to Symbol API that I use to get a model graph. When I apply it to the deeplab_resnet101_coco (and any other DeepLab-based model), I get this error:

  File "/home/nero/Files/Workspace/env/lib/python3.6/site-packages/gluoncv/model_zoo/deeplabv3.py", line 107, in hybrid_forward
    _, _, h, w = x.shape
AttributeError: 'Symbol' object has no attribute 'shape'

[ghost]

I have the same issue.

[Jerryzcn]

This is due to deeplab not implemented in static graph. related issue: #547

[github-actions]

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