The same as Maia2 repo except...
Important changes:
transformer_only.py file contains new Maia2Model class and updated process_per_game function
utils.py contains new tokenize_board_to_tensor function, new MoveTokenizer class, and new game_to_tensor function.
IMPORTANT: right now the model only works with board tokenization, will integrate move tokenization into training after we finish testing board tokenization