Returning axis from calculate_qparams (#29494)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/29494
`calculate_qparams` of per channel quantization should return the axis, this
PR added this and also added corresponding support in graph mode
Test Plan:
python test/test_jit.py
Imported from OSS
Differential Revision: D18580905
fbshipit-source-id: f9691c1f043f8bca39f81716a4d0b10f60a65396
