run FunctionCorrelation cupy GPU

[duongpaKikai]

Dear @jinsc37

We have run DIFRINT with us video and result very good
We want to convert DIFRINT => TorchScript to add us program run in C++ for demo to boss
But when script model we get error with re.search('(SIZE_)([0-4])(\()([^\)]*)(\))', strKernel) in cupy of FunctionCorrelation

So whether have way replate calculate Correlation with cupy. just use operator between tensor with tensor on cpu

many thank