1 files changed, 50 insertions, 0 deletions
diff --git a/generic/SoftShrink.c b/generic/SoftShrink.c
new file mode 100644
index 0000000..0bc4075
--- /dev/null
+++ b/generic/SoftShrink.c
@@ -0,0 +1,50 @@
+#ifndef TH_GENERIC_FILE
+#define TH_GENERIC_FILE "generic/SoftShrink.c"
+#else
+
+static int nn_(SoftShrink_updateOutput)(lua_State *L)
+{
+  THTensor *input = luaT_checkudata(L, 2, torch_(Tensor_id));
+  real lambda = luaT_getfieldchecknumber(L, 1, "lambda");
+  THTensor *output = luaT_getfieldcheckudata(L, 1, "output", torch_(Tensor_id));
+
+  THTensor_(resizeAs)(output, input);
+  
+  TH_TENSOR_APPLY2(real, output, real, input,				\
+                   if ((*input_data) > lambda) *output_data = *input_data - lambda; \
+                   else if ((*input_data) < -lambda) *output_data = *input_data + lambda; \
+                   else *output_data = 0;);
+  return 1;
+}
+
+static int nn_(SoftShrink_updateGradInput)(lua_State *L)
+{
+  THTensor *input = luaT_checkudata(L, 2, torch_(Tensor_id));
+  real lambda = luaT_getfieldchecknumber(L, 1, "lambda");
+  THTensor *gradOutput = luaT_checkudata(L, 3, torch_(Tensor_id));
+  THTensor *gradInput = luaT_getfieldcheckudata(L, 1, "gradInput", torch_(Tensor_id));
+
+  THTensor_(resizeAs)(gradInput, input);
+  TH_TENSOR_APPLY3(real, gradInput, real, gradOutput, real, input,	\
+                   if ((*input_data) > lambda || (*input_data) < -lambda) \
+		     *gradInput_data = (*gradOutput_data);		\
+		   else							\
+		     *gradInput_data = 0;				\
+    );
+  return 1;
+}
+
+static const struct luaL_Reg nn_(SoftShrink__) [] = {
+  {"SoftShrink_updateOutput", nn_(SoftShrink_updateOutput)},
+  {"SoftShrink_updateGradInput", nn_(SoftShrink_updateGradInput)},
+  {NULL, NULL}
+};
+
+static void nn_(SoftShrink_init)(lua_State *L)
+{
+  luaT_pushmetaclass(L, torch_(Tensor_id));
+  luaT_registeratname(L, nn_(SoftShrink__), "nn");
+  lua_pop(L,1);
+}
+
+#endif