Ask HN: What are the best platforms for AI-powered web apps?

So I'm currently doing research for a machine learning project I want to implement. Outside of work for free online courses, I've only ever done linear regression, both from scratch and using scikit-learn. I learned that doing what I want to do would require neural networks (deep learning, which is best done with a GPU). I have a few questions:

   1. if I'm using prebuilt models (the app consists of determining the probability that a song is X genre) do I need a GPU? I know I'll still need tensorflow (the lib I'll be using).

   2. What is the typical protocol for setting up AI-powered apps like this? This is the first time I'm doing this

   3. If I need a good GPU, who is the best afforable host?

Thanks in advance