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// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
import 'dart:ffi';
import 'package:quiver/check.dart';
import 'bindings/interpreter.dart';
import 'bindings/types.dart';
import 'interpreter_options.dart';
import 'ffi/helper.dart';
import 'model.dart';
import 'tensor.dart';
/// TensorFlowLite interpreter for running inference on a model.
class Interpreter {
final Pointer<TFL_Interpreter> _interpreter;
bool _deleted = false;
bool _allocated = false;
/// Creates interpreter from model or throws if unsuccessful.
factory Interpreter(Model model, {InterpreterOptions options}) {
final interpreter = TFL_NewInterpreter(
model.base, options?.base ?? cast<TFL_InterpreterOptions>(nullptr));
message: 'Unable to create interpreter.');
return Interpreter._(interpreter);
/// Creates interpreter from a model file or throws if unsuccessful.
factory Interpreter.fromFile(String file, {InterpreterOptions options}) {
final model = Model.fromFile(file);
final interpreter = Interpreter(model, options: options);
return interpreter;
/// Destroys the model instance.
void delete() {
checkState(!_deleted, message: 'Interpreter already deleted.');
_deleted = true;
/// Updates allocations for all tensors.
void allocateTensors() {
checkState(!_allocated, message: 'Interpreter already allocated.');
checkState(TFL_InterpreterAllocateTensors(_interpreter) == TFL_Status.ok);
_allocated = true;
/// Runs inference for the loaded graph.
void invoke() {
checkState(_allocated, message: 'Interpreter not allocated.');
checkState(TFL_InterpreterInvoke(_interpreter) == TFL_Status.ok);
/// Gets all input tensors associated with the model.
List<Tensor> getInputTensors() => List.generate(
(i) => Tensor(TFL_InterpreterGetInputTensor(_interpreter, i)),
growable: false);
/// Gets all output tensors associated with the model.
List<Tensor> getOutputTensors() => List.generate(
(i) => Tensor(TFL_InterpreterGetOutputTensor(_interpreter, i)),
growable: false);
// Unimplemented:
// TFL_InterpreterResizeInputTensor