feat: Implement test case for aten::to.dtype lowering

Signed-off-by: Dheeraj Peri <[email protected]>

Author: peri044

core/lowering/passes/reduce_to.cpp

@@ -17,13 +17,13 @@ void ReduceToOperation(std::shared_ptr<torch::jit::Graph>& graph) {
             %out : Tensor = aten::to(%x, %dtype, %nb, %copy, %format)
             return (%out))IR";
   std::string to_dtype_layout_pattern = R"IR(
-        graph(%x, %device, %dtype, %layout, %nb, %copy, %format, %other):
-            %out : Tensor = aten::to.dtype_layout(%x, %device, %dtype, %layout, %nb, %copy, %format, %other)
+        graph(%x, %device, %dtype, %layout, %pm, %nb, %copy, %format):
+            %out : Tensor = aten::to(%x, %device, %dtype, %layout, %pm, %nb, %copy, %format)
             return (%out))IR";
 
   std::string to_dtype_multi_input_pattern = R"IR(
-        graph(%x, %device, %dtype, %layout, %nb, %copy, %format, %other):
-            %out : Tensor = aten::to(%x, %device, %dtype, %nb, %copy, %format)
+        graph(%x, %device, %dtype, %layout, %pm, %nb, %copy, %format):
+            %out : Tensor = aten::to(%x, %dtype, %nb, %copy, %format)
             return (%out))IR";
 
   std::string to_type_as_pattern = R"IR(

tests/core/lowering/test_reduce_to_pass.cpp

@@ -28,6 +28,28 @@ TEST(LoweringPasses, ReduceToCorrectly) {
   ASSERT_TRUE(!torch::jit::findPatternMatches(*tg, *sg).empty());
 }
 
+TEST(LoweringPasses, ReduceToDtypeLayoutCorrectly) {
+  std::string source_graph = R"IR(
+    graph(%x, %device, %dtype, %layout, %pm, %nb, %copy, %format):
+        %out : Tensor = aten::to(%x, %device, %dtype, %layout, %pm, %nb, %copy, %format)
+        return (%out))IR";
+  std::string target_graph = R"IR(
+    graph(%x, %device, %dtype, %layout, %pm, %nb, %copy, %format):
+        %out : Tensor = aten::to(%x, %dtype, %nb, %copy, %format)
+        return (%out))IR";
+
+  torch_tensorrt::core::util::logging::get_logger().set_reportable_log_level(
+      torch_tensorrt::core::util::logging::LogLevel::kGRAPH);
+  auto sg = std::make_shared<torch::jit::Graph>();
+  torch::jit::parseIR(source_graph, &*sg);
+  torch_tensorrt::core::lowering::passes::ReduceToOperation(sg);
+
+  auto tg = std::make_shared<torch::jit::Graph>();
+  torch::jit::parseIR(target_graph, &*tg);
+
+  ASSERT_TRUE(!torch::jit::findPatternMatches(*tg, *sg).empty());
+}
+
 TEST(LoweringPasses, ReduceAtenTypeAsCorrectly) {
   std::string source_graph = R"IR(
     graph(%input, %other):