Skip group convolutions

src/layout_nhwc.cpp

@@ -51,6 +51,9 @@ void transform_convolutions(module& m)
             continue;
         if(ins->get_shape().lens().size() != 4)
             continue;
+        auto v = ins->get_operator().to_value();
+        if (v.at("group").to<int>() > 1)
+            continue;
         auto args = ins->inputs();
         std::transform(args.begin(), args.end(), args.begin(), [&](auto& i) {
             return m.insert_instruction(ins, make_op("layout", {{"permutation", {0, 2, 3, 1}}}), i);