Access Method directly from TrainingModule. (#13602)

Summary:

.

Differential Revision: D80821085

Author: shoumikhin

extension/training/module/training_module.cpp

@@ -162,23 +162,24 @@ TrainingModule::named_attributes(const std::string& method_name) {
     method_named_attributes_.insert({method_name, {}});
 
     // get method metadata
-    auto meta_res = executorch::extension::Module::method_meta(method_name);
+    auto meta_res = method_meta(method_name);
     if (!meta_res.ok()) {
       return meta_res.error();
     }
     // get method
-    auto method_res = executorch::extension::Module::method(method_name);
-    if (!method_res.ok()) {
-      return method_res.error();
+    auto e = load_method(method_name);
+    if (e != runtime::Error::Ok) {
+      return e;
     }
+    auto& method = methods_.at(method_name).method;
     // get tensor by name
     for (int idx = 0; idx < meta_res->num_attributes(); idx++) {
       const auto tensor_res = meta_res->attribute_tensor_meta(idx);
       if (!tensor_res.ok()) {
         return tensor_res.error();
       }
       const auto tensorName = tensor_res.get().name();
-      const auto attribute_res = (*method_res)->get_attribute(tensorName);
+      const auto attribute_res = method->get_attribute(tensorName);
       if (!attribute_res.ok()) {
         return attribute_res.error();
       }