Failed to load Arcface from ONNX model zoo

[bfgoldstein]

Description

I was trying to load the Arcface model downloaded from ONNX model zoo, but a "NotImplementedError: Operator Sub not implemented." exception was raised.

It seems that this model had some problems before, but it was fixed here. However, there is a commit made on June 10 that removes support for some ONNX Operators, like add, subtract, multiply, and divide.

Error Message

[12:03:05] /home/bruno/mxnet/mxnet/src/storage/storage.cc:198: Using Pooled (Naive) StorageManager for CPU
Traceback (most recent call last):
  File "error_reproduce.py", line 5, in <module>
    sym, arg_params, aux_params = import_model(model)
  File "/home/bruno/mxnet/mxnet/python/mxnet/contrib/onnx/onnx2mx/import_model.py", line 59, in import_model
    sym, arg_params, aux_params = graph.from_onnx(model_proto.graph)
  File "/home/bruno/mxnet/mxnet/python/mxnet/contrib/onnx/onnx2mx/import_onnx.py", line 115, in from_onnx
    mxnet_sym = self._convert_operator(node_name, op_name, onnx_attr, inputs)
  File "/home/bruno/mxnet/mxnet/python/mxnet/contrib/onnx/onnx2mx/import_onnx.py", line 63, in _convert_operator
    raise NotImplementedError("Operator {} not implemented.".format(op_name))
NotImplementedError: Operator Sub not implemented.

To Reproduce

• Download the model from ONNX model zoo. File arcfaceresnet100-8.onnx (git lfs);
• Then run the python script below

Minimal python script:

import sys
from mxnet.contrib.onnx.onnx2mx.import_model import import_model

model = sys.argv[1]
sym, arg_params, aux_params = import_model(model)

Environment

• OS: CentOS 8.2
• Python: 3.7.7
• ONNX: 1.7.0
• MXNET: master (built from source)

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