Properly setting OC for Group Convolution (#1161)

* group conv fix

* group conv fix

* fix typo

src/ngraph/runtime/cpu/op/group_conv.cpp

@@ -60,11 +60,12 @@ Shape op::GroupConvolution::get_weights_dimensions() const
 {
     //reshape weights into 5d tensors that includes groups
     const size_t OC = 0;
+    const size_t OC_IN_OUTPUT = 1;
     const size_t IC = 1;
     Shape weights_shape_groups{get_inputs().at(1).get_shape()};
     //adjust output and channel given a number of groups
 
-    weights_shape_groups.at(OC) /= get_groups();
+    weights_shape_groups.at(OC) = get_shape().at(OC_IN_OUTPUT) / get_groups();
     weights_shape_groups.at(IC) = get_inputs().at(0).get_shape().at(IC) / get_groups();
     //push_front the number of groups
     weights_shape_groups.insert(weights_shape_groups.begin(), get_groups());