MR #51

PyTorch 1.9.1 (fixed in versions >= 1.10.0) depends on an older onnx
version that utilizes a deprecated function from Google's protobuf
library that was removed in version 3.18.0 (see
https://github.com/protocolbuffers/protobuf/pull/8794/).

Workaround by specifying an explicit version range for this
dependency.

Egidio Falotico mentioned NRP has problems integrating py-torch "into
the platform". Let's see what happens…