rshogi-py 0.9.0

Python bindings for the rshogi core library.

rshogi-py

Python bindings for the rshogi Rust crate.

This package provides the standard build of the rshogi Python module. Use this package by default. If you have an AVX2-capable x86_64 CPU and want the AVX2-optimized build, use rshogi-py-avx2.

Development Install

python -m pip install maturin
maturin develop -m crates/rshogi-py/pyproject.toml

AVX2 Build

rshogi-py-avx2 is an AVX2-enabled build of the same Python module for AVX2-capable x86_64 CPUs.

python -m pip install rshogi-py-avx2

Notes

• rshogi-py and rshogi-py-avx2 are mutually exclusive; install only one.
• rshogi-py is the safest default for broad compatibility.
• policy 学習向けの move label 変換は rshogi.policy から利用できます。

Policy Labels

from rshogi.core import Move
from rshogi.policy import compact_move_label, move_label
from rshogi.types import Color

mv = Move.from_usi("7g7f")

label = move_label(mv, Color.BLACK)
compact = compact_move_label(mv, Color.BLACK)

print(label)    # 2187 クラス
print(compact)  # 1496 クラス or None

Quick Example

from rshogi.core import Board

board = Board()
board.apply_usi("7g7f")
print(board.to_sfen())

raw-state を Python から直接編集することもできます。

from rshogi.core import Board
from rshogi.types import Color, Piece, PieceType, Square

board = Board()
state = board.to_position_state()
state.set_piece(Square.from_usi("7g"), Piece(0))
state.set_piece(Square.from_usi("7f"), Piece.from_color_type(Color.BLACK, PieceType.PAWN))
state.ply = 42

board.set_position_state(state)
report = board.validate_all()
print(board.to_sfen())
print(report.is_valid())

USI の position 文字列を直接扱うこともできます。

from rshogi.core import Board, normalize_usi_position, parse_usi_position

board = Board()
board.set_usi_position("position startpos moves 7g7f 3c3d")

board2 = parse_usi_position("startpos moves 7g7f")
print(board2.to_sfen())

print(normalize_usi_position("position startpos"))  # "startpos"

cshogi / Apery Compatibility

rshogi can interoperate with cshogi / Apery move and training-data formats.

from rshogi.core import Board, Move

board = Board()
move = Move.from_usi("7g7f")

apery = move.to_apery()
apery32 = board.apery_move32_from_move(move)
hcpe = board.to_hcpe(best_move=apery, score=120, game_result="BLACK_WIN")

print(int(apery))
print(apery32.to_usi())
print(len(hcpe))  # 38

Structured Imports

rshogi provides structured imports through submodules for better organization:

# Types and constants
from rshogi.types import Color, PieceType, Square
from rshogi.core import Move, Move32, AperyMove, AperyMove32

# Board
from rshogi.core import Board, PositionState, ValidationIssue, ValidationReport

# Records
from rshogi.record import GameRecord, GameRecordMetadata, GameResult

# Record conversion
record = GameRecord.from_kif_str(kif_text)
kif_text = record.to_kif()

# Record file I/O
record = GameRecord.from_kif_file("example.kif")
record.write_kif("example_out.kif")

# NumPy dtypes
from rshogi.numpy import (
    PackedSfen,
    PackedSfenValue,
    HuffmanCodedPos,
    HuffmanCodedPosAndEval,
)

# Policy labels
from rshogi.policy import move_label, compact_move_label

Use submodules for all imports:

from rshogi.core import Board
from rshogi.core import Move
from rshogi.record import GameRecord

Record I/O Notes

GameRecord の棋譜 I/O は Rust core と同じ互換方針で動作します。

• KIF/KI2 は ShogiHome/tsshogi 系の実務互換と shogi-validator 寄りの整形を意識しています。
• 変化手順と終局要約が同居する場合、to_kif() / to_ki2() は 変化：... を先に、 まで... を最後に出力します。
• from_kif_str() / from_ki2_str() で読んだ初手前コメントは GameRecord.initial_comment に保持され、to_kif() / to_ki2() で 1 手目の前に戻ります。
• from_csa_str() / from_csa_file() は CSA 3.0 に合わせて '*comment だけを プログラムが読むコメントとして受理し、plain な 'comment は読み飛ばします。 受理した開始局面コメントは GameRecord.initial_comment に保持されます。
• 互換性のため、手番行より前にある '*comment も initial_comment に正規化して受理します。
• GameRecordMetadata.comment は自由コメントではなく、KIF の 備考 / CSA の $NOTE / JKF header の 備考 に対応します。
• to_csa() は move comment と初期局面コメントを '*comment として出力し、 write_kif() / write_ki2() / write_csa() は末尾改行つきで書き出します。