Is there a way to get GPU acceleration on Raspberry Pi 4 for Deep Learning?
You cant use the raspberry Pi GPU for machine learning. First, it doesnt meet the hardware requirements for most DL models and second you probably need a Nvidia GPU. What you are looking for is a Jetson Nano from nvidia, which is like a RPi but has a GPU that supports cuda. These are made to deploy machine learning models, check it out!
On the official Tensorflow Lite website they show the support for GPU acceleration for Android and iOS but they don't say anything about support for Raspberry Pi.