diff options
Diffstat (limited to 'generic/Sigmoid.c')
-rw-r--r-- | generic/Sigmoid.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/generic/Sigmoid.c b/generic/Sigmoid.c new file mode 100644 index 0000000..20348b9 --- /dev/null +++ b/generic/Sigmoid.c @@ -0,0 +1,44 @@ +#ifndef TH_GENERIC_FILE +#define TH_GENERIC_FILE "generic/Sigmoid.c" +#else + +static int nn_(Sigmoid_updateOutput)(lua_State *L) +{ + THTensor *input = luaT_checkudata(L, 2, torch_(Tensor_id)); + THTensor *output = luaT_getfieldcheckudata(L, 1, "output", torch_(Tensor_id)); + + THTensor_(resizeAs)(output, input); + + TH_TENSOR_APPLY2(real, output, real, input, \ + *output_data = 1./(1.+ exp(- *input_data));) + + return 1; +} + +static int nn_(Sigmoid_updateGradInput)(lua_State *L) +{ + THTensor *gradOutput = luaT_checkudata(L, 3, torch_(Tensor_id)); + THTensor *output = luaT_getfieldcheckudata(L, 1, "output", torch_(Tensor_id)); + THTensor *gradInput = luaT_getfieldcheckudata(L, 1, "gradInput", torch_(Tensor_id)); + + THTensor_(resizeAs)(gradInput, output); + TH_TENSOR_APPLY3(real, gradInput, real, gradOutput, real, output, \ + real z = *output_data; \ + *gradInput_data = *gradOutput_data * (1. - z) * z;) + return 1; +} + +static const struct luaL_Reg nn_(Sigmoid__) [] = { + {"Sigmoid_updateOutput", nn_(Sigmoid_updateOutput)}, + {"Sigmoid_updateGradInput", nn_(Sigmoid_updateGradInput)}, + {NULL, NULL} +}; + +static void nn_(Sigmoid_init)(lua_State *L) +{ + luaT_pushmetaclass(L, torch_(Tensor_id)); + luaT_registeratname(L, nn_(Sigmoid__), "nn"); + lua_pop(L,1); +} + +#endif |