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feat: run inferences in an isolate using IsolateInterpreter (#52)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| /* | ||
| * Copyright 2023 The TensorFlow Authors. All Rights Reserved. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| import 'dart:async'; | ||
| import 'dart:isolate'; | ||
|
|
||
| import 'package:tflite_flutter/tflite_flutter.dart'; | ||
|
|
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| class IsolateInterpreter { | ||
| IsolateInterpreter({ | ||
| required this.address, | ||
| this.debugName = 'TfLiteInterpreterIsolate', | ||
| }) { | ||
| _init(); | ||
| } | ||
|
|
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| final int address; | ||
| final String debugName; | ||
|
|
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| final ReceivePort _receivePort = ReceivePort(); | ||
| late final SendPort _sendPort; | ||
| late final Isolate _isolate; | ||
|
|
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| final StreamController<IsolateInterpreterState> _stateChanges = | ||
| StreamController.broadcast(); | ||
| late final StreamSubscription _stateSubscription; | ||
| Stream<IsolateInterpreterState> get stateChanges => _stateChanges.stream; | ||
| IsolateInterpreterState __state = IsolateInterpreterState.idle; | ||
| IsolateInterpreterState get state => __state; | ||
| set _state(IsolateInterpreterState value) { | ||
| __state = value; | ||
| if (!_stateChanges.isClosed) { | ||
| _stateChanges.add(__state); | ||
| } | ||
| } | ||
|
|
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| Future<void> _init() async { | ||
| _isolate = await Isolate.spawn( | ||
| _mainIsolate, | ||
| _receivePort.sendPort, | ||
| debugName: debugName, | ||
| ); | ||
|
|
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| _stateSubscription = _receivePort.listen((state) { | ||
| if (state is SendPort) { | ||
| _sendPort = state; | ||
| } | ||
|
|
||
| if (state is IsolateInterpreterState) { | ||
| _state = state; | ||
| } | ||
| }); | ||
| } | ||
|
|
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| static Future<void> _mainIsolate(SendPort sendPort) async { | ||
| final port = ReceivePort(); | ||
|
|
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| sendPort.send(port.sendPort); | ||
|
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| await for (final _IsolateInterpreterData data in port) { | ||
| final interpreter = Interpreter.fromAddress(data.address); | ||
| sendPort.send(IsolateInterpreterState.loading); | ||
| interpreter.runInference(data.inputs); | ||
| sendPort.send(IsolateInterpreterState.idle); | ||
| } | ||
| } | ||
|
|
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| /// Run for single input and output | ||
| Future<void> run(Object input, Object output) { | ||
| var map = <int, Object>{}; | ||
| map[0] = output; | ||
|
|
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| return runForMultipleInputs([input], map); | ||
| } | ||
|
|
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| /// Run for multiple inputs and outputs | ||
| Future<void> runForMultipleInputs( | ||
| List<Object> inputs, | ||
| Map<int, Object> outputs, | ||
| ) async { | ||
| if (state == IsolateInterpreterState.loading) return; | ||
| _state = IsolateInterpreterState.loading; | ||
|
|
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| final data = _IsolateInterpreterData( | ||
| address: address, | ||
| inputs: inputs, | ||
| ); | ||
|
|
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| _sendPort.send(data); | ||
| await _wait(); | ||
|
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| final interpreter = Interpreter.fromAddress(address); | ||
| final outputTensors = interpreter.getOutputTensors(); | ||
| for (var i = 0; i < outputTensors.length; i++) { | ||
| outputTensors[i].copyTo(outputs[i]!); | ||
| } | ||
| } | ||
|
|
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| Future<void> _wait() async { | ||
| if (state == IsolateInterpreterState.loading) { | ||
| await for (final state in stateChanges) { | ||
| if (state == IsolateInterpreterState.idle) break; | ||
| } | ||
| } | ||
| } | ||
|
|
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| Future<void> close() async { | ||
| await _stateSubscription.cancel(); | ||
| await _stateChanges.close(); | ||
| _isolate.kill(); | ||
| } | ||
| } | ||
|
|
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| enum IsolateInterpreterState { | ||
| idle, | ||
| loading, | ||
| } | ||
|
|
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| class _IsolateInterpreterData { | ||
| _IsolateInterpreterData({ | ||
| required this.address, | ||
| required this.inputs, | ||
| }); | ||
|
|
||
| final int address; | ||
| final List<Object> inputs; | ||
| } |
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