Implement the API to release resources held by ORT

lib/services/semantic_search/frameworks/ml_framework.dart

@@ -41,6 +41,9 @@ abstract class MLFramework {
     await _initTextModel();
   }
 
+  // Releases any resources held by the framework
+  Future<void> release() async {}
+
   /// Returns the cosine similarity between [imageEmbedding] and [textEmbedding]
   double computeScore(List<double> imageEmbedding, List<double> textEmbedding) {
     assert(

lib/services/semantic_search/frameworks/onnx/onnx.dart

@@ -1,5 +1,6 @@
 import "package:computer/computer.dart";
 import "package:logging/logging.dart";
+import "package:onnxruntime/onnxruntime.dart";
 import "package:photos/services/semantic_search/frameworks/ml_framework.dart";
 import "package:photos/services/semantic_search/frameworks/onnx/onnx_image_encoder.dart";
 import "package:photos/services/semantic_search/frameworks/onnx/onnx_text_encoder.dart";
@@ -107,4 +108,12 @@ class ONNX extends MLFramework {
       rethrow;
     }
   }
+
+  @override
+  Future<void> release() async {
+    final session = OrtSession.fromAddress(_textEncoderAddress);
+    session.release();
+    OrtEnv.instance.release();
+    _logger.info('Released');
+  }
 }

lib/services/semantic_search/semantic_search_service.dart

@@ -78,6 +78,12 @@ class SemanticSearchService {
     });
   }
 
+  Future<void> release() async {
+    if (_frameworkInitialization.isCompleted) {
+      await _mlFramework.release();
+    }
+  }
+
   Future<void> sync() async {
     if (_isSyncing) {
       return;

pubspec.lock

@@ -1388,10 +1388,11 @@ packages:
   onnxruntime:
     dependency: "direct main"
     description:
-      name: onnxruntime
-      sha256: "56d0a16c24f4d1be4cf976cdc6321fb33d81515429e6e81c58d02e77d8631e0f"
-      url: "https://pub.dev"
-    source: hosted
+      path: "."
+      ref: HEAD
+      resolved-ref: "1318dce97f3aae5ec9bdf7491d5eff0ad6beb378"
+      url: "https://github.com/ente-io/onnxruntime.git"
+    source: git
     version: "1.1.0"
   open_mail_app:
     dependency: "direct main"

pubspec.yaml

@@ -117,7 +117,8 @@ dependencies:
   # open_file: ^3.2.1
   objectbox: ^2.3.1
   objectbox_flutter_libs: any
-  onnxruntime: ^1.1.0
+  onnxruntime:
+    git: "https://github.com/ente-io/onnxruntime.git"
   open_mail_app: ^0.4.5
   package_info_plus: ^4.1.0
   page_transition: ^2.0.2