flutter_litert_flex

FlexDelegate (SELECT_TF_OPS) addon for flutter_litert. Automatically downloads and bundles the TensorFlow Lite Flex delegate native library at build time for all platforms.

When do you need this? #

The Flex delegate is required when your .tflite model uses TensorFlow ops that aren't available as TFLite builtins. Common cases:

• On-device training with convolutional or batch-normalized layers (gradient ops like Conv2DBackpropFilter)
• Checkpoint-based persistence using tf.raw_ops.Save/Restore
• Models converted with SELECT_TF_OPS enabled

If your model only uses TFLITE_BUILTINS, you don't need this package.

Installation #

dependencies:
  flutter_litert: ^1.0.3
  flutter_litert_flex: ^0.0.1

That's it. The native libraries are downloaded automatically on the first build.

Usage #

import 'package:flutter_litert/flutter_litert.dart';

final options = InterpreterOptions();
options.addDelegate(FlexDelegate());
final interpreter = await Interpreter.fromAsset('model.tflite', options: options);

No FlexDelegate.download() call needed when using this package.

Platform details #

Libraries are downloaded once and cached in the plugin directory. Subsequent builds use the cached copy.

Credits #

Based on TensorFlow Lite v2.20.0. See flutter_litert for the base inference library.