Unify the usage of Dequantize (#15685)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15685
The declaration of "Dequantize" is in "fbsource/fbcode/deeplearning/fbgemm2/QuantUtils.h", so it requires the "namespace fbgemm".
<T> is actually optional, since the type can de deduced from the first argument.
In some places we have "Dequantize<T>(...)", while in other places we have "Dequantize(...)". We'd better unify them. As a reference, all occurrences of "Quantize" are using "fbgemm::Quantize<T>(...)".
Reviewed By: jspark1105
Differential Revision: D13570847
fbshipit-source-id: 7fca9f7f9e4e0d9e5eb27ac44b8707adc3c80717
