[7/N] Add sugar syntax for module.update

Pull Request resolved: #11534

The update API in method is supposed to be portable, but we can make it more user friendly for the update API in module. Add a bit sugar syntax in module to improve UX. Such that user can update backend option in module like following:
```
Module module(stub_model_path_);
int new_num_threads = 4;

const auto update_result = module.update("forward",
      {
        {"StubBackend", {{IntKey("NumberOfThreads"), new_num_threads}}
      },
  );
```
ghstack-source-id: 290372285
@exported-using-ghexport

Differential Revision: [D76242292](https://our.internmc.facebook.com/intern/diff/D76242292/)

Author: cccclai

extension/module/module.cpp

@@ -317,5 +317,46 @@ runtime::Error Module::update(
   return method->update(backend_options);
 }
 
+runtime::Error Module::update(
+    runtime::ArrayRef<runtime::Entry> backend_options) {
+  return update("forward", backend_options);
+}
+
+runtime::Error Module::update(
+    const std::string& method_name,
+    const std::unordered_map<std::string, std::vector<runtime::BackendOption>>&
+        backend_options) {
+  std::vector<runtime::Entry> entries;
+  entries.reserve(backend_options.size());
+
+  for (const auto& [backend_name, options] : backend_options) {
+    entries.push_back(
+        {backend_name.c_str(),
+         runtime::ArrayRef<runtime::BackendOption>(
+             options.data(), options.size())});
+  }
+
+  return update(
+      method_name,
+      runtime::ArrayRef<runtime::Entry>(entries.data(), entries.size()));
+}
+
+runtime::Error Module::update(
+    const std::unordered_map<std::string, std::vector<runtime::BackendOption>>&
+        backend_options) {
+  std::vector<runtime::Entry> entries;
+  entries.reserve(backend_options.size());
+
+  for (const auto& [backend_name, options] : backend_options) {
+    entries.push_back(
+        {backend_name.c_str(),
+         runtime::ArrayRef<runtime::BackendOption>(
+             options.data(), options.size())});
+  }
+
+  return update(
+      runtime::ArrayRef<runtime::Entry>(entries.data(), entries.size()));
+}
+} // namespace ET_MODULE_NAMESPACE
 } // namespace extension
 } // namespace executorch

extension/module/module.h

@@ -14,6 +14,8 @@
 #include <unordered_set>
 #include <vector>
 
+#include <executorch/runtime/backend/backend_options.h>
+#include <executorch/runtime/backend/backend_options_map.h>
 #include <executorch/runtime/executor/program.h>
 
 #ifdef USE_ATEN_LIB
@@ -487,10 +489,41 @@ class Module {
    *
    * @returns An Error to indicate success or failure.
    */
-  ET_EXPERIMENTAL ET_NODISCARD inline runtime::Error update(
-      runtime::ArrayRef<runtime::Entry> backend_options) {
-    return update("forward", backend_options);
-  }
+  ET_EXPERIMENTAL ET_NODISCARD runtime::Error update(
+      runtime::ArrayRef<runtime::Entry> backend_options);
+
+  /**
+   * EXPERIMENTAL: Updates backend options for a specific method.
+   * Loads the program and method before updating if needed. It uses simple
+   * std library like unordered_map to store backend options.
+   *
+   * @param[in] method_name The name of the method to update.
+   * @param[in] backend_options A map of <backend_name,
+   * vector<backend_options>>.
+   *
+   * @returns An Error to indicate success or failure.
+   */
+  ET_EXPERIMENTAL ET_NODISCARD runtime::Error update(
+      const std::string& method_name,
+      const std::unordered_map<
+          std::string,
+          std::vector<runtime::BackendOption>>& backend_options);
+
+  /**
+   * EXPERIMENTAL: Updates backend options for a specific method.
+   * Loads the program and method before updating if needed. It uses simple
+   * std library like unordered_map to store backend options.
+   *
+   * @param[in] method_name The name of the method to update.
+   * @param[in] backend_options A map of <backend_name,
+   * vector<backend_options>>.
+   *
+   * @returns An Error to indicate success or failure.
+   */
+  ET_EXPERIMENTAL ET_NODISCARD runtime::Error update(
+      const std::unordered_map<
+          std::string,
+          std::vector<runtime::BackendOption>>& backend_options);
 
   /**
    * Retrieves the EventTracer instance being used by the Module.

extension/module/test/module_test.cpp

@@ -15,9 +15,9 @@
 
 #include <executorch/extension/data_loader/file_data_loader.h>
 #include <executorch/extension/tensor/tensor.h>
-#include <executorch/runtime/core/exec_aten/testing_util/tensor_util.h>
 #include <executorch/runtime/backend/backend_options.h>
 #include <executorch/runtime/backend/backend_options_map.h>
+#include <executorch/runtime/core/exec_aten/testing_util/tensor_util.h>
 #include <executorch/runtime/executor/test/stub_backend.h>
 
 using namespace ::executorch::extension;
@@ -33,7 +33,7 @@ class ModuleTest : public ::testing::Test {
     add_mul_path_ = std::getenv("ET_MODULE_ADD_MUL_PROGRAM_PATH");
     add_mul_data_path_ = std::getenv("ET_MODULE_ADD_MUL_DATA_PATH");
     stub_model_path_ = std::getenv("ET_MODULE_ADD_MUL_DELEGATED_PATH");
-    
+
     // Register the StubBackend for testing
     StubBackend::register_singleton();
   }
@@ -492,7 +492,6 @@ TEST_F(ModuleTest, TestUpdate) {
   EXPECT_EQ(update_result, Error::Ok);
 
   ASSERT_EQ(StubBackend::singleton().num_threads(), new_num_threads);
-  
 }
 
 TEST_F(ModuleTest, TestUpdateNonExistentMethod) {
@@ -503,8 +502,22 @@ TEST_F(ModuleTest, TestUpdateNonExistentMethod) {
   int new_num_threads = 4;
   backend_options.set_option(IntKey("NumberOfThreads"), new_num_threads);
   map.add("StubBackend", backend_options.view());
-  
+
   // Test update method with non-existent method name
   const auto update_result = module.update("nonexistent", map.entries());
   EXPECT_NE(update_result, Error::Ok);
 }
+
+TEST_F(ModuleTest, TestUpdateSugarSyntax) {
+  Module module(stub_model_path_);
+  int new_num_threads = 4;
+
+  // Using std::unordered_map and std::vector directly
+  std::unordered_map<std::string, std::vector<BackendOption>> backend_options =
+      {{"StubBackend", {{"NumberOfThreads", new_num_threads}}}};
+
+  const auto update_result = module.update("forward", backend_options);
+
+  EXPECT_EQ(update_result, Error::Ok);
+  ASSERT_EQ(StubBackend::singleton().num_threads(), new_num_threads);
+}