Bug fix in dynamic quantization kernels + better test coverage. (#33320)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/33320
Reviewed By: supriyar
Differential Revision: D19893911
Pulled By: AshkanAliabadi
fbshipit-source-id: e79dd06af333c6629e3412315550814da28d9c24
