data path support for ios

Author: lucylq

extension/apple/ExecuTorch/Exported/ExecuTorchModule.h

@@ -123,6 +123,21 @@ NS_SWIFT_NAME(Module)
 __attribute__((deprecated("This API is experimental.")))
 @interface ExecuTorchModule : NSObject
 
+/**
+ * Initializes a module with a file path, data path and a specified load mode.
+ *
+ * @param filePath A string representing the path to the ExecuTorch program file.
+ * @param dataFilePath A string representing the path to a .ptd file with
+ * external tensors and external data.
+ * @param loadMode A value from ExecuTorchModuleLoadMode that determines the
+ * file loading behavior.
+ * @return An initialized ExecuTorchModule instance.
+ */
+- (instancetype)initWithFilePath:(NSString *)filePath
+                    dataFilePath:(NSString *)dataPath
+                        loadMode:(ExecuTorchModuleLoadMode)loadMode
+    NS_DESIGNATED_INITIALIZER;
+
 /**
  * Initializes a module with a file path and a specified load mode.
  *

extension/apple/ExecuTorch/Exported/ExecuTorchModule.mm

@@ -250,19 +250,37 @@ @implementation ExecuTorchModule {
 }
 
 - (instancetype)initWithFilePath:(NSString *)filePath
+                    dataFilePath:(NSString *)dataFilePath
                         loadMode:(ExecuTorchModuleLoadMode)loadMode {
   self = [super init];
   if (self) {
-    _module = std::make_unique<Module>(
-      filePath.UTF8String,
-      static_cast<Module::LoadMode>(loadMode)
-    );
-    _inputs = [NSMutableDictionary new];
-    _outputs = [NSMutableDictionary new];
+    if (dataFilePath) {
+      _module = std::make_unique<Module>(
+        filePath.UTF8String,
+        dataFilePath.UTF8String,
+        static_cast<Module::LoadMode>(loadMode)
+      );
+      _inputs = [NSMutableDictionary new];
+      _outputs = [NSMutableDictionary new];
+    } else {
+      _module = std::make_unique<Module>(
+        filePath.UTF8String,
+        static_cast<Module::LoadMode>(loadMode)
+      );
+      _inputs = [NSMutableDictionary new];
+      _outputs = [NSMutableDictionary new];
+    }
   }
   return self;
 }
 
+- (instancetype)initWithFilePath:(NSString *)filePath
+                        loadMode:(ExecuTorchModuleLoadMode)loadMode {
+  return [self initWithFilePath:filePath
+                   dataFilePath:nil
+                       loadMode:loadMode];
+}
+
 - (instancetype)initWithFilePath:(NSString *)filePath {
   return [self initWithFilePath:filePath loadMode:ExecuTorchModuleLoadModeFile];
 }