At what level in the algo parallelized?

hello @siboehm, I read your post on lleaves from 2021. Very well-written. I'm new to lightGBM. Your approach with LLVM to compile the model is something I have a question on. In a multi-core machine, how you parallelize the work? Is it that each tree is a separate execution thread? Can the tree traversal be sped up by distributing the work ? Thank you Auro