Run inference with pytorch 1.11 and numpy > 1.20

[AngusG]

Running inference with RTX 4090, NVIDIA Driver Version: 545.23.08, CUDA Version: 12.3 throws RuntimeError: cuDNN error: CUDNN_STATUS_EXECUTION_FAILED.

Upgrading pytorch to 1.11.0 resolves the issue.

This PR:

• quiets a pytorch __floordiv__ deprecation warning.
• numpy version is unspecified in the requirements.txt, however numpy deprecated aliases to int/float after version 1.20 resulting in an error. The proposed fix is adopted.

AttributeError: module 'numpy' has no attribute 'int'.
np.int was a deprecated alias for the builtin int. To avoid this error in existing code, use int by itself. Doing this will not modify any behavior and is safe. When replacing np.int, you may wish to use e.g. np.int64 or np.int32 to specify the precision. If you wish to review your current use, check the release note link for additional information.
The aliases was originally deprecated in NumPy 1.20; for more details and guidance see the original release note at: https://numpy.org/devdocs/release/1.20.0-notes.html#deprecations