Note

Sentis is now called Inference Engine. The documentation has moved to https://docs.unity3d.com/Packages/com.unity.ai.inference@latest. Refer to the new location for the latest updates and guidance. Make sure to update your bookmarks and references accordingly.

Inspect a model

You can inspect a runtime model in Unity to access its inputs, outputs, and layers. This helps you understand the model’s structure and integrate it into your application.

Get model inputs

Use the inputs property of the runtime model to get the inputs of the model with and the name and shape of each input.

For example:

using UnityEngine;
using System.Collections.Generic;
using Unity.Sentis;

public class GetModelInputs : MonoBehaviour
{
    public ModelAsset modelAsset;

    void Start()
    {
        Model runtimeModel = ModelLoader.Load(modelAsset);

        List<Model.Input> inputs = runtimeModel.inputs;

        // Loop through each input
        foreach (var input in inputs)
        {
            // Log the name of the input, for example Input3
            Debug.Log(input.name);

            // Log the tensor shape of the input, for example (1, 1, 28, 28)
            Debug.Log(input.shape);
        }
    }
}

Input dimensions can be fixed or dynamic. Refer to Model inputs for more information.

Get model outputs

Use the outputs property of the runtime model to get the names of the output layers of the model.

For example:

List<Model.Output> outputs = runtimeModel.outputs;

// Loop through each output
foreach (var output in outputs)
{
    // Log the name of the output
    Debug.Log(output.name);
}

Get layers and layer properties

Use the layers property of the runtime model to get the neural network layers in the model, and the index, inputs or outputs of each layer.

Open a model as a graph

To open an ONNX model as a graph, follow these steps:

  1. Install Netron, a third-party viewer for neural networks.
  2. Double-click a model asset in the Project window, or select the model asset then select Open in the Model Asset Import Settings window.

Additional resources