New tools for finding, training, and using custom machine learning models on Android



Posted by Hoi Lam , Android Machine Learning

Yesterday, we talked about turnkey machine learning (ML) solutions with ML Kit . But what if that doesn’t completely address your needs and you need to tweak it a little? Today, we will discuss how to find alternative models, and how to train and use custom ML models in your Android app.

Find alternative ML models

Crop disease models from the wider research community available on tfhub.dev

If the turnkey ML solutions don't suit your needs, TensorFlow Hub should be your first port of call. It is a repository of ML models from Google and the wider research community. The models on the site are ready for use in the cloud, in a web-browser or in an app on-device. For Android developers, the most exciting models are the TensorFlow Lite (TFLite) models that are optimized for mobile.

In addition to key vision models such as MobileNet and EfficientNet, the repository also boast models powered by the latest research such as:

Wine classification for 400,000 popular wines

US supermarket product classification for 100,000 products

Landmark recognition on a per-continent basis

CropNet model by Brain Accra for recognising Cassava leaf disease

Plant disease recognition from AgriPredict that detects disease in maize and tomato plants

Many of these solutions were previously only available in the cloud, as the models are too large and too power intensive to run on-device. Today, you can run them on Android on-device, offline and live .

Train your own custom model

Besides the large repository of base models, developers can also train their own models. Developer-friendly tools are available for many common use cases. In addition to Firebase’s AutoML Vision Edge , the TensorFlow team launched TensorFlow Lite Model Maker earlier this year to give developers more choices over the base model that support more use cases. TensorFlow Lite Model Maker currently supports two common ML tasks:

Image Classification

Text Classification

The TensorFlow Lite Model Maker can run on your own developer machine or in Google Colab online machine learning notebooks. Going forward, the team plans to improve the existing offerings and to add new use cases.

Using custom model in your Android app

New TFLite Model import screen in Android Studio 4.1 beta

Once you have selected a model or trained your model there are new easy-to-use tools to help you integrate them into your Android app without having to convert everything into ByteArrays. The first new tool is ML Model binding with Android Studio 4.1 . This lets developers import any TFLite model, read the input / output signature of the model, and use it with just a few lines of code that calls the open source TensorFlow Lite Android Support Library.

Another way to implement a...

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