add check to see number of filters is divisible be num_groups

theano/tensor/nnet/c_code/corr3d_gemm.c

@@ -184,6 +184,11 @@ PyArrayObject* corr3dMM(PyArrayObject* bottom,
                 "Corr3dMM images and kernel must have the same stack size\n");
         return NULL;
     }
+    if ((nFilters %% numgroups) != 0) {
+        PyErr_SetString(PyExc_ValueError,
+                "CorrMM the number of filters must be divisible by the number of groups\n");
+        return NULL;
+    }
     // implicit dilated filter
     const int dil_kH = (kH - 1) * dilH + 1;
     const int dil_kW = (kW - 1) * dilW + 1;