I think you’re confusing two separate things. There’s two separate approaches to a computer vision task: classical and deep learning. Halide and OpenCV are for classical approaches, TensorFlow is for deep learning.

People don’t use both for the same problem, nobody is using “tensorflow code running on the halide ir”.

Both approaches use a lot of basic operations applied to matrices, so the custom ASIC supports either, but separately. HDR sounds like a better fit for a classical approach, so their HDR filter is probably written in Halide, with no machine learning or TensorFlow anywhere.