coremltools

🐞Describe the bug

Converting Frontend cannot be 100% converted when pytorch model is converted to MLmodel. I get a warning

Trace

`TracerWarning: Converting a tensor to a Python boolean might cause the trace to be incorrect. We can't record the data flow of Python values, so this value will be treated as a constant in the future. This means that the trace might not generalize to other

🌱 Describe your Feature Request

Support Path (from pathlib) as type of argument model

https://github.com/onnx/onnx-coreml/blob/7a630c113b27c8cc1a83412ce1dbfda77f9f8422/onnx_coreml/converter.py#L447

convert doesn't support Path as type of argument model
but onnx.load supports Path

Use cases

from pathlib import Path
model_path = Path("path/to/onnx")
convert(model_p