Xam.Plugins.OnDeviceCustomVision (nuget): The Azure Custom Vision service (https://customvision.ai) is able to create models that can be exported as CoreML, Tensorflow or ONNX models to do image classification.  This plugin makes it easy to download and use these models offline from inside your mobile app, using CoreML on iOS, Tensorflow on Android or WinML on Windows.  These models can then be called from a .NET standard library, using something like Xam.Plugins.Media to take photos for classification.
Keywords: xamarin|image|classification|AI|ML|custom|vision|pcl|xam.pcl|plugin|for|android|xamarin.forms|ios|monoandroid|monodroid|monotouch