TreeQuest Files

This release includes a major update on the TreeQuest interface (#14).

Ask-Tell Interface

We added ask-tell interface, where users run ask or ask_batch to get the parent state and action of the next node to expand in the search tree. Using the returned Trial object, users run generate_fn to calculate the score and state of the expanded node, and update the search tree with tell interface.

This new interface enables us to

1. Perform multiple AB-MCTS sampling steps in parallel by ask_batch.
2. Run multiple generation processes in parallel and run tell once an evaluation process finishes.

so that now both TreeQuest itself and users can leverage more cpu resource to speed up the tree search.

For the performance for different batch sizes, please see docs/PROFILING.md.