Renaming variables from dX to dY in Learnable Fake Quantize kernels for Better Clarity (#42032)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/42032
In this diff, the arguments `dX` within the C++ kernels are named as `dY` for clarity and avoid confusion since it doesn't represent the gradient with respect to the input.
Test Plan:
To test all related fake quantize kernel operators, on a devvm, run the command:
`buck test //caffe2/test:quantization -- learnable`
Reviewed By: z-a-f, jerryzh168
Differential Revision: D22735429
fbshipit-source-id: 9d6d967f08b98a720eca39a4d2280ca8109dcdd6
