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import io
import logging
from datasets import (
GeneratorBasedBuilder,
DatasetInfo,
SplitGenerator,
Split,
DownloadManager,
Features,
Value,
Array2D,
)
from adversarial_gym.chess_env import ChessEnv
import zstandard as zstd
class ChessPGNDataset(GeneratorBasedBuilder):
VERSION = "0.0.1"
def _info(self):
return DatasetInfo(
description="Chess positions + moves + results, streamed from PGN shards",
features=Features({
"state": Array2D((8,8), dtype="int8"),
"action": Value("int16"),
"result": Value("int8"),
})
)
def _split_generators(self, dl_manager: DownloadManager):
from pathlib import Path
import os
if self.config.data_dir:
repo_root = Path(self.config.data_dir)
train_files = [repo_root / 'train' / f for f in os.listdir(repo_root / 'train')]
test_files = [repo_root / 'test' / f for f in os.listdir(repo_root / 'test')]
elif self.config.data_files:
train_files = self.config.data_files["train"]
test_files = self.config.data_files["test"]
train_paths = dl_manager.download(train_files)
test_paths = dl_manager.download(test_files)
return [
SplitGenerator(
name=Split.TRAIN,
gen_kwargs={"shards": train_paths},
),
SplitGenerator(
name=Split.TEST,
gen_kwargs={"shards": test_paths},
),
]
def _generate_examples(self, shards):
import chess.pgn
uid = 0
for path in shards:
decompressor = zstd.ZstdDecompressor()
with open(path, "rb") as compressed:
with decompressor.stream_reader(compressed) as reader:
text_stream = io.TextIOWrapper(reader, encoding='utf-8')
while (game := chess.pgn.read_game(text_stream)) is not None:
# while (game := chess.pgn.read_game(f)) is not None:
board = game.board()
base = {"1-0":1,"0-1":-1}.get(game.headers["Result"], 0)
for move in game.mainline_moves():
state = ChessEnv.get_piece_configuration(board)
state = state if board.turn else -state
action = ChessEnv.move_to_action(move)
result = base * (-1 if board.turn == 0 else 1)
yield uid, {
"state": state.astype("int8"),
"action": int(action),
"result": int(result),
}
uid += 1
board.push(move)
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