lib_onnx

Dart/Flutter → thin C ABI → ONNX Runtime. 0.3.0 / bridge ABI 2 provides CPU inference on macOS arm64 and Android arm64-v8a with ONNX Runtime 1.31.1, and on iOS with ONNX Runtime 1.30.0 (the newest official iOS archive). CoreML and QNN HTP integration remain experimental; GPU/NPU acceptance and Qwen acceptance remain open. See the 0.3.0 acceptance scope.

The native-assets route downloads and verifies the pinned archive (SHA-256) and builds the bridge without CWD/Homebrew searches or copying libraries. It requires Dart 3.10+ and a C11 toolchain (Xcode for Apple targets, the Android NDK for Android). hooks.user_defines.lib_onnx.native_bundle still overrides any target with an explicitly verified bundle; see distribution.

dependencies:
  lib_onnx: ^0.3.0

import 'dart:typed_data';
import 'package:lib_onnx/lib_onnx.dart';

Future<void> main() async {
  final runtime = await OnnxRuntime.createAsync();
  try {
    final session = await InferenceSession.loadFile(
      'mlp_smoke.onnx', // tools/make_test_models.py
      runtime: runtime,
      options: SessionOptions.cpuOnly(),
    );
    final input = OnnxTensor.fromFloat32(
      [1, 4], Float32List.fromList([1, 2, 3, 4]),
    );
    final result = await session.runWithDiagnostics({'input': input});
    print(result.outputs['output']!.asFloat32List());
    print(result.diagnostic); // Registered EPs, observed/unknown facts, actual model hash
    await session.close();
  } finally {
    await runtime.close();
  }
}

preferAne permits CoreML CPU and Neural Engine; it does not promise ANE-only execution. Strict policy disables ORT CPU EP fallback, independently of CoreML's internal compute units. A model with unsupported nodes fails. Physical hardware requirements are optional and currently fail explicitly with HardwareVerificationUnavailable because no per-run device trace is collected. Registration and a successful run do not establish GPU/NPU use.

loadFile, loadBytes, createAsync, run, and awaitable close keep native work/waits off the calling isolate. Inputs are snapshotted; accepted tasks own native copies and independent RunOptions. Timeouts include preparation and queueing on a monotonic clock; interruption is cooperative. Results are retained until Dart acknowledges them. Call close before stopping an owning isolate or hot restarting; GC/abrupt isolate termination is not a shutdown protocol.

Seven numeric types, scalars, empty tensors and arbitrary valid ranks are supported. Unsupported values, overflow and invalid buffers fail explicitly. EmbeddingAdapter validates pooling/masks/fp16/normalization; its tests do not establish Qwen execution. The Qwen profile workflow pins genuine checkpoint/tokenizer provenance and requires real inference before acceptance.

dart pub get
python3 tools/make_test_models.py
dart test
tools/run_native_tests.sh             # ASan + UBSan; needs exact local ORT input
tools/run_native_tests.sh thread      # separate TSan build
tools/run_dart_native_tests.sh        # test-only dequeue latch
python3 tools/verify_consumer.py --help

The Flutter example uses a bundled real MLP and real diagnostics. Generate the desired host scaffold with Flutter tooling before running it; the archive consumer script creates a separate clean Flutter app for delivery checks.

Repair evidence and remaining gates · API/ABI migration · Architecture · Execution policy · Device matrix

MIT. ONNX Runtime's license and third-party notices are retained under native/third_party/onnxruntime/. Qualcomm SDK files are not redistributed here.