[feat] Add dynamic conversion path to aten::mul evaluator

core/conversion/evaluators/aten.cpp

@@ -455,6 +455,16 @@ auto aten_registrations TORCHTRT_UNUSED =
         .evaluator(
             {c10::Symbol::fromQualString("aten::mul"),
              [](ConversionCtx* ctx, const torch::jit::Node* n, kwargs& args) -> c10::optional<torch::jit::IValue> {
+               if (!constTypesOnly(args)) {
+                 auto a = args.at(n->input(0)).ITensorOrFreeze(ctx);
+                 auto b = args.at(n->input(1)).ITensorOrFreeze(ctx);
+                 auto mul =
+                     converters::add_elementwise(ctx, nvinfer1::ElementWiseOperation::kPROD, a, b, util::node_info(n));
+                 TORCHTRT_CHECK(mul, "Unable to create mul layer from node: " << *n);
+                 auto out = ctx->AssociateValueAndTensor(n->outputs()[0], mul->getOutput(0));
+                 LOG_DEBUG("Output tensor shape: " << out->getDimensions());
+                 return {};
+               }
                if (args.at(n->input(0)).IValue()->isInt()) {
                  auto a = args.at(n->input(0)).unwrapToInt();
                  auto b = args.at(n->input(1)).unwrapToInt();

core/conversion/var/Var.cpp

@@ -92,15 +92,18 @@ nvinfer1::ITensor* Var::ITensorOrFreeze(ConversionCtx* ctx) {
   }
 
   TORCHTRT_CHECK(
-      isITensor() || (isIValue() && (ptr_.ivalue->isTensor() || ptr_.ivalue->isCustomClass())),
-      "Requested either IValue containing a Tensor, or ITensor, however Var type is " << type_name());
+      isITensor() ||
+          (isIValue() && (ptr_.ivalue->isTensor() || ptr_.ivalue->isScalar() || ptr_.ivalue->isCustomClass())),
+      "Requested either IValue containing a Tensor, Scalar or ITensor, however Var type is " << type_name());
 
   nvinfer1::ITensor* out;
 
   if (isIValue()) {
     if (ptr_.ivalue->isTensor()) {
       auto tensor = ptr_.ivalue->toTensor();
       out = converters::tensor_to_const(ctx, tensor);
+    } else if (ptr_.ivalue->isScalar()) {
+      out = converters::scalar_to_tensor(ctx, ptr_.ivalue->toScalar());
     } else {
       // Split converter generates c10::IValue which hold TensorContainer.
       auto output_container = ptr_.ivalue->toCustomClass<TensorContainer>();

tests/cpp/test_dynamic_size.cpp

@@ -87,5 +87,37 @@ TEST(Converters, ATenResizeGetItemDynShapeCorrectly) {
 
   auto trt = trt_results[0].reshape(jit_results[0].sizes());
 
+  ASSERT_TRUE(torch_tensorrt::tests::util::almostEqual(jit_results[0], trt, 2e-6));
+}
+
+TEST(Converters, ATenResizeGetItemDynShapeMulCorrectly) {
+  const auto graph = R"IR(
+    graph(%x.1 : Tensor):
+            %2 : int = prim::Constant[value=0]()
+            %3 : int = prim::Constant[value=-1]()
+            %4 : int = prim::Constant[value=2]()
+            %size.1 : int[] = aten::size(%x.1)
+            %37 : int = aten::__getitem__(%size.1, %2)
+            %38 : int = aten::mul(%37, %4)
+            %39 : int[] = prim::ListConstruct(%38, %3)
+            %7 : Tensor = aten::reshape(%x.1, %39)
+            return (%7))IR";
+
+  auto g = std::make_shared<torch::jit::Graph>();
+
+  torch::jit::parseIR(graph, g.get());
+
+  auto in = at::randint(1, 10, {16, 16, 16}, {at::kCUDA});
+
+  auto jit_in = at::clone(in);
+  auto params = torch_tensorrt::core::ir::get_static_params(g->inputs(), {});
+  auto jit_results = torch_tensorrt::tests::util::RunGraph(g, params, {jit_in});
+
+  auto trt_in = at::clone(in);
+  params = torch_tensorrt::core::ir::get_static_params(g->inputs(), {});
+  auto trt_results = torch_tensorrt::tests::util::RunGraphEngineDynamic(g, params, {in}, true);
+
+  auto trt = trt_results[0].reshape(jit_results[0].sizes());
+
   ASSERT_TRUE(torch_tensorrt::tests::util::almostEqual(jit_results[0], trt, 2e-6));
 }