NPU conversion script fails

I’m trying to port a pytorch model to run on the NPU. I’ve exported both an onnx file and a .pt file using pytorch version 1.2.0 and onnx version 1.4.1. When I try to run the convert_onnx script, I get the following error:

I Start importing onnx...
I Current ONNX Model use ir_version 4 opset_version 9
Traceback (most recent call last):
  File "", line 40, in <module>
  File "", line 33, in main
  File "acuitylib/", line 138, in load_onnx
  File "acuitylib/app/importer/", line 72, in run
  File "acuitylib/converter/", line 472, in __init__
  File "acuitylib/converter/", line 162, in infer_shape
  File "acuitylib/converter/", line 125, in __status_update
  File "acuitylib/converter/", line 159, in __model_rebuild
  File "acuitylib/converter/", line 330, in build_onnx_model
KeyError: ''
[2681] Failed to execute script convertonnx

When I try to use the pytorch importer, I get a similar error:

I Start importing pytorch... ********************
WARNING: Token 'COMMENT' defined, but not used
WARNING: There is 1 unused token
Traceback (most recent call last):
  File "", line 51, in <module>
  File "", line 41, in main
  File "acuitylib/", line 146, in load_pytorch
  File "acuitylib/app/importer/", line 92, in run
  File "acuitylib/converter/", line 526, in __init__
  File "acuitylib/converter/", line 610, in model_simplify
  File "acuitylib/converter/", line 107, in shape_pick
  File "acuitylib/converter/", line 143, in __ir_shape_inference
KeyError: 'aten::slice'
[2709] Failed to execute script convertpytorch

I checked the docs, all the layers should be supported. Can someone help me figure out what is going wrong and how to fix it?