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Abs.cu
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Abs.cu
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#include "utils.h"
#include "THCApply.cuh"
struct absupdateOutput_functor
{
__device__ void operator()(float* output, const float* input) const
{
*output = abs(*input);
}
};
static int cunn_Abs_updateOutput(lua_State *L)
{
THCState *state = getCutorchState(L);
THCudaTensor *input = (THCudaTensor*)luaT_checkudata(L, 2, "torch.CudaTensor");
THCudaTensor *output = (THCudaTensor*)luaT_getfieldcheckudata(L, 1, "output", "torch.CudaTensor");
THAssert(THCudaTensor_checkGPU(state, 2, input, output));
THCudaTensor_resizeAs(state, output, input);
THCudaTensor_pointwiseApply2(state, output, input, absupdateOutput_functor());
return 1;
}
struct absupdateGradInput_functor
{
__device__ void operator()(float* gradInput, const float* input, const float* gradOutput) const
{
*gradInput = *input < 0 ? - *gradOutput : *gradOutput;
}
};
static int cunn_Abs_updateGradInput(lua_State *L)
{
THCState *state = getCutorchState(L);
THCudaTensor *input = (THCudaTensor*)luaT_checkudata(L, 2, "torch.CudaTensor");
THCudaTensor *gradOutput = (THCudaTensor*)luaT_checkudata(L, 3, "torch.CudaTensor");
THCudaTensor *gradInput = (THCudaTensor*)luaT_getfieldcheckudata(L, 1, "gradInput", "torch.CudaTensor");
THAssert(THCudaTensor_checkGPU(state, 3, input, gradOutput, gradInput));
THCudaTensor_resizeAs(state, gradInput, input);
THCudaTensor_pointwiseApply3(state, gradInput, input, gradOutput, absupdateGradInput_functor());
return 1;
}
static const struct luaL_Reg cunn_Abs__ [] = {
{"Abs_updateOutput", cunn_Abs_updateOutput},
{"Abs_updateGradInput", cunn_Abs_updateGradInput},
{NULL, NULL}
};
void cunn_Abs_init(lua_State *L)
{
luaT_pushmetatable(L, "torch.CudaTensor");
luaT_registeratname(L, cunn_Abs__, "nn");
lua_pop(L,1);
}