RuntimeError: Node (): unknown attribute 'starts'

[JustinMBrown]

I converted a pytorch model to ONNX using these settings:

input = torch.tensor(torch.ones(1,3,32,32))

torch.onnx.export(model.module,
input,
"test.onnx",
export_params=True,
opset_version=11,
do_constant_folding=True,
input_names=['input'],
output_names=['output'],
verbose=True)

I imported that model to ngraph using these commands:

import onnx
from ngraph_onnx.onnx_importer.importer import import_onnx_model
onnx_protobuf = onnx.load('test.onnx')
ng_function = import_onnx_model(onnx_protobuf)

On import_onnx_model, it throws this error:

File "/home/justin/PycharmProjects/beverage-inference/venv/lib/python3.6/site-packages/ngraph_onnx/onnx_importer/importer.py", line 36, in import_onnx_model
return onnx_import.import_onnx_model(onnx_protobuf.SerializeToString())
RuntimeError: Node (): unknown attribute 'starts'

Is there a way to see which node has the "starts" attribute? I have a feeling it's related to slice, but I can't be sure.

Attached is a dump of the nodes from the onnx protobuf, nodes.txt.

Versions:
pytorch 1.4
onnx 1.6
ngraph-core 0.26
ngraph-onnx 0.24