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Descrizione
Android now has a neural network API that delegates to NPU/DSP/GPU or falls back to CPU, on devices running Android 8.1 or higher. https://developer.android.com/ndk/guides/neuralnetworks/
Ideally there would be a backend in dlib to support this framework as it is likely going to be the most optimised pathway going forwards.
NNAPI is a bit limited in what it can do at this stage. It only does int8, int32 and float32 for types and a few dozen operations.
It was expanded in NNAPI 1.1, adding some more operations [Div/Mul/Pad/Mean/Sub] (which requires Android 9.0).
Example implementation can be found in the Tensorflow Lite library: https://github.com/tensorflow/tensorflow/blob/master/tensorflow/lite/nnapi/NeuralNetworksShim.h