Onnx interop Key features and brief samples.
Nd4j allows execution of models via onnx runtime using nd4j's INDArray as a data structure. Leveraging the nd4j-onnxruntime interop is fairly simple. An onnx model can be loaded and executed as follows:
File f = new File ("path/to/your/model.onnx");
INDArray x = Nd4j.scalar(1.0f).reshape(1,1);
INDArray y = Nd4j.scalar(1.0f).reshape(1,1);
OnnxRuntimeRunner onnxRuntimeRunner = OnnxRuntimeRunner.builder()
Map<String,INDArray> inputs = new LinkedHashMap<>();
Map<String, INDArray> exec = onnxRuntimeRunner.exec(inputs);
INDArray z = exec.get("z");
This outputs a result with a map of output names to the ndarray result from onnx.
In maven, add the following dependency:
Note, this depends on javacpp's onnxruntime bindings. This means onnx runtime's native binaries are managed by javacpp. Javacpp will bundle all native binaries for all platforms by default unless you specify a platform. You can do this by specifying a -Dplatform=your-platform-of-choice. You may find more here in the javacpp docs.