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#ifndef THC_GENERIC_FILE
#define THC_GENERIC_FILE "generic/GatedLinearUnit.cu"
#else
void THNN_(GatedLinear_updateOutput)(
THCState *state,
THCTensor *input,
THCTensor *output,
int dim)
{
THCUNN_assertSameGPU(state, 2, input, output);
// size output to half of input
dim = dim - 1;
const long nIn = THCTensor_(size)(state, input, dim);
THArgCheck(nIn % 2 == 0, 2, "Halving dimension must be even. Dim %d is size %ld", dim+1, nIn);
const long inputSize = THCTensor_(size)(state, input, dim) / 2;
THLongStorage *newSizes = THCTensor_(newSizeOf)(state, input);
THLongStorage_set(newSizes, dim, inputSize);
THCTensor_(resize)(state, output, newSizes, NULL);
// halve tensor
THCTensor *firstHalf = THCTensor_(newNarrow)(state, input, dim, 0, inputSize);
THCTensor *secondHalf = THCTensor_(newNarrow)(state, input, dim, inputSize, inputSize);
// x = x1:cmul( sigmoid(x2) )
THC_pointwiseApply3(state, output, secondHalf, firstHalf, gatedLinearCSigMul_functor<real, accreal>());
THLongStorage_free(newSizes);
THCTensor_(free)(state, firstHalf);
THCTensor_(free)(state, secondHalf);
}
void THNN_(GatedLinear_updateGradInput)(
THCState *state,
THCTensor *input,
THCTensor *gradOutput,
THCTensor *gradInput,
int dim)
{
THCUNN_assertSameGPU(state, 2, gradOutput, gradInput);
dim = dim - 1;
const long nIn = THCTensor_(size)(state, input, dim);
THArgCheck(nIn % 2 == 0, 2, "Halving dimension must be even. Dim %d is size %ld", dim+1, nIn);
THCTensor_(resizeAs)(state, gradInput, input);
const long inputSize = THCTensor_(size)(state, input, dim) / 2;
THCTensor *firstHalf = THCTensor_(newNarrow)(state, input, dim, 0, inputSize);
THCTensor *secondHalf = THCTensor_(newNarrow)(state, input, dim, inputSize, inputSize);
THCTensor *gradInputfirstHalf = THCTensor_(newNarrow)(state, gradInput, dim, 0, inputSize);
THCTensor *gradInputsecondHalf = THCTensor_(newNarrow)(state, gradInput, dim, inputSize, inputSize);
// first half of derivative
THC_pointwiseApply3(state, gradInputfirstHalf, secondHalf, gradOutput, gatedLinearCSigMul_functor<real, accreal>());
// second half of derivative
THCTensor_(copy)(state, gradInputsecondHalf, firstHalf);
THC_pointwiseApply3(state, gradInputsecondHalf, secondHalf, gradOutput, gatedLinearDerivativeSecondHalf_functor<real, accreal>());
THCTensor_(free)(state, firstHalf);
THCTensor_(free)(state, secondHalf);
THCTensor_(free)(state, gradInputfirstHalf);
THCTensor_(free)(state, gradInputsecondHalf);
}
#endif
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