[x] fix tft_fit() : make self$device available for the get_decoder_mask()
[x] fix predict() :
Error in (function (self, mat1, mat2, beta, alpha) :
# Tensor for 'out' is on CPU, Tensor for argument #1 'self' is on CPU, but expected them to be on GPU (while checking arguments for addmm)
tft_fit()
: make self$device available for theget_decoder_mask()
predict()
:fix #9