Adding test to quantized copy for 'from float' (#43681)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/43681
Test Plan: Imported from OSS
Reviewed By: supriyar
Differential Revision: D23364507
Pulled By: z-a-f
fbshipit-source-id: ef1b00937b012b0647d9b9afa054437f2bce032a
