add missing definition

Author: soumith

generic/THCTensorMathReduce.h

@@ -36,6 +36,11 @@ THC_API real THCTensor_(minall)(THCState *state, THCTensor *self);
 THC_API real THCTensor_(maxall)(THCState *state, THCTensor *self);
 THC_API real THCTensor_(medianall)(THCState *state, THCTensor *self);
 
+THC_API void THCTensor_(median)(THCState *state,
+				THCTensor *values,
+				THCudaLongTensor *indices,
+				THCTensor *src, long dim, int keepdim);
+
 THC_API accreal THCTensor_(dist)(THCState *state, THCTensor *self, THCTensor *src,
                               real value);