Merge pull request #319 from NVIDIA/mul_scalar

Add mul.scalar converter

Author: narendasan

core/conversion/converters/impl/element_wise.cpp

@@ -363,6 +363,21 @@ auto element_wise_registrations TRTORCH_UNUSED =
                         add_elementwise(ctx, nvinfer1::ElementWiseOperation::kPROD, self, other, util::node_info(n));
                     TRTORCH_CHECK(mul, "Unable to create mul layer from node: " << *n);
 
+                    mul->setName(util::node_info(n).c_str());
+                    auto out = ctx->AssociateValueAndTensor(n->outputs()[0], mul->getOutput(0));
+                    LOG_DEBUG("Output tensor shape: " << out->getDimensions());
+                    return true;
+                  }})
+        .pattern({"aten::mul.Scalar(Tensor self, Scalar other) -> (Tensor)",
+                  [](ConversionCtx* ctx, const torch::jit::Node* n, args& args) -> bool {
+                    // TODO: Remove with functionalization
+                    auto self = args[0].ITensorOrFreeze(ctx);
+                    auto otherScalar = args[1].unwrapToScalar().to<float>();
+                    auto other = tensor_to_const(ctx, torch::tensor({otherScalar}));
+                    auto mul =
+                        add_elementwise(ctx, nvinfer1::ElementWiseOperation::kPROD, self, other, util::node_info(n));
+                    TRTORCH_CHECK(mul, "Unable to create mul layer from node: " << *n);
+
                     mul->setName(util::node_info(n).c_str());
                     auto out = ctx->AssociateValueAndTensor(n->outputs()[0], mul->getOutput(0));
                     LOG_DEBUG("Output tensor shape: " << out->getDimensions());

tests/core/conversion/converters/test_element_wise.cpp

@@ -111,6 +111,15 @@ TEST(Converters, ATenMulConvertsCorrectly) {
   pointwise_test_helper(graph, false, true, {4, 3}, {3, 4, 3});
 }
 
+TEST(Converters, ATenMulWithScalarConvertsCorrectly) {
+  const auto graph = R"IR(
+      graph(%0 : Tensor):
+        %scalar : float = prim::Constant[value=2.4]()
+        %1 : Tensor = aten::mul(%0, %scalar)
+        return (%1))IR";
+  pointwise_test_helper(graph, true);
+}
+
 TEST(Converters, ATenDivConvertsCorrectly) {
   const auto graph = R"IR(
       graph(%0 : Tensor, %1 : Tensor):