feat: initialize majiang-rl project
This commit is contained in:
game-loader
578
majiang_rl/envs/mahjong_env.py
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578
majiang_rl/envs/mahjong_env.py
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from __future__ import annotations
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import random
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from dataclasses import dataclass, field
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from typing import Dict, List, Optional, Tuple
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import gymnasium as gym
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import numpy as np
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from gymnasium import spaces
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from ..rules import can_chi_options, is_win
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from ..tiles import TILE_TYPES, build_wall, is_flower, tile_name
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PHASE_AGENT_TURN = 0
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PHASE_AGENT_RESPONSE = 1
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ACTION_DISCARD = 0
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ACTION_DECLARE_WIN = 1
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ACTION_DECLARE_KONG = 2
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ACTION_PASS = 3
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ACTION_DECLARE_PONG = 4
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ACTION_DECLARE_CHI = 5
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@dataclass
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class PlayerState:
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hand: List[int] = field(default_factory=list)
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melds: List[List[int]] = field(default_factory=list)
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discards: List[int] = field(default_factory=list)
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flowers: List[int] = field(default_factory=list)
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class MahjongEnv(gym.Env):
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metadata = {"render_modes": ["human"]}
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def __init__(self, seed: Optional[int] = None, max_rounds: int = 1):
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super().__init__()
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self.max_rounds = max_rounds
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self.action_space = spaces.Dict(
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{
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"type": spaces.Discrete(6),
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"tile": spaces.Discrete(len(TILE_TYPES)),
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"chi": spaces.Discrete(3),
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}
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)
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self.observation_space = spaces.Dict(
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{
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"hand": spaces.Box(0, 4, shape=(len(TILE_TYPES),), dtype=np.int8),
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"melds": spaces.Box(0, 4, shape=(4, len(TILE_TYPES)), dtype=np.int8),
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"discards": spaces.Box(0, 4, shape=(4, len(TILE_TYPES)), dtype=np.int8),
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"flowers": spaces.Box(0, 8, shape=(4,), dtype=np.int8),
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"wall_count": spaces.Box(0, 144, shape=(1,), dtype=np.int16),
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"current_player": spaces.Box(0, 3, shape=(1,), dtype=np.int8),
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"phase": spaces.Box(0, 1, shape=(1,), dtype=np.int8),
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}
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)
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self._random = random.Random(seed)
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self._round = 0
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self.agent_index = 0
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self.players: List[PlayerState] = []
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self.wall: List[int] = []
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self.current_player = 0
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self.phase = PHASE_AGENT_TURN
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self.pending_discard: Optional[Tuple[int, int]] = None
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self.skip_draw_for_player: Optional[int] = None
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self.done = False
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self.winner: Optional[int] = None
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self.terminal_reason: Optional[str] = None
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self.event_log: List[Dict[str, object]] = []
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def reset(self, *, seed: Optional[int] = None, options: Optional[dict] = None):
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super().reset(seed=seed)
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if seed is not None:
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self._random.seed(seed)
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self._round += 1
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self.players = [PlayerState() for _ in range(4)]
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self.wall = build_wall(self._random)
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self.current_player = 0
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self.pending_discard = None
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self.skip_draw_for_player = None
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self.done = False
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self.winner = None
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self.terminal_reason = None
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self.event_log = []
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for _ in range(13):
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for player in range(4):
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self._draw_tile(player)
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self._draw_tile(0)
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self.skip_draw_for_player = 0
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self.phase = PHASE_AGENT_TURN
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self._advance_to_agent()
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return self._get_obs(), self._get_info()
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def step(self, action: Dict[str, int]):
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if self.done:
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return self._get_obs(), 0.0, True, False, self._get_info()
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reward = 0.0
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action = self._sanitize_action(action)
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action_type = int(action["type"])
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tile_id = int(action["tile"])
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chi_choice = int(action["chi"])
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if self.phase == PHASE_AGENT_TURN:
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reward += self._handle_agent_turn(action_type, tile_id)
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elif self.phase == PHASE_AGENT_RESPONSE:
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reward += self._handle_agent_response(action_type, tile_id, chi_choice)
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if not self.done:
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self._advance_to_agent()
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if self.done:
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if self.winner == self.agent_index:
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reward += 1.0
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elif self.winner is not None:
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reward -= 1.0
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return self._get_obs(), reward, self.done, False, self._get_info()
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def render(self):
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if self.done:
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print(f"Winner: {self.winner}, reason: {self.terminal_reason}")
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else:
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print(f"Player {self.current_player} to act, wall {len(self.wall)}")
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def _get_obs(self):
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hand_counts = self._counts(self.players[self.agent_index].hand)
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melds = np.zeros((4, len(TILE_TYPES)), dtype=np.int8)
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discards = np.zeros((4, len(TILE_TYPES)), dtype=np.int8)
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flowers = np.zeros(4, dtype=np.int8)
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for idx, player in enumerate(self.players):
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for meld in player.melds:
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for tile in meld:
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melds[idx, tile] += 1
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for tile in player.discards:
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discards[idx, tile] += 1
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flowers[idx] = len(player.flowers)
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return {
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"hand": hand_counts,
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"melds": melds,
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"discards": discards,
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"flowers": flowers,
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"wall_count": np.array([len(self.wall)], dtype=np.int16),
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"current_player": np.array([self.current_player], dtype=np.int8),
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"phase": np.array([self.phase], dtype=np.int8),
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}
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def _get_info(self):
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action_mask = self._action_mask()
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return {
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"winner": self.winner,
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"terminal_reason": self.terminal_reason,
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"pending_discard": self.pending_discard,
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"action_mask": action_mask,
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}
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def _sanitize_action(self, action: Dict[str, int]) -> Dict[str, int]:
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if not isinstance(action, dict):
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return self._sample_valid_action()
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if "type" not in action or "tile" not in action or "chi" not in action:
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return self._sample_valid_action()
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mask = self._action_mask()
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action_type = int(action["type"])
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tile_id = int(action["tile"])
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chi_choice = int(action["chi"])
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if action_type < 0 or action_type >= 6:
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return self._sample_valid_action()
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if not mask["type"][action_type]:
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return self._sample_valid_action()
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if action_type == ACTION_DISCARD:
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if not mask["discard"][tile_id]:
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return self._sample_valid_action()
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if action_type == ACTION_DECLARE_PONG:
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if not mask["pong"][tile_id]:
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return self._sample_valid_action()
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if action_type == ACTION_DECLARE_KONG:
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if not mask["kong"][tile_id]:
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return self._sample_valid_action()
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if action_type == ACTION_DECLARE_CHI:
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if not mask["chi"][chi_choice]:
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return self._sample_valid_action()
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return {"type": action_type, "tile": tile_id, "chi": chi_choice}
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def _sample_valid_action(self) -> Dict[str, int]:
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mask = self._action_mask()
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valid_types = np.flatnonzero(mask["type"])
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if len(valid_types) == 0:
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return {"type": ACTION_PASS, "tile": 0, "chi": 0}
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action_type = int(self._random.choice(valid_types))
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tile_id = 0
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chi_choice = 0
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if action_type == ACTION_DISCARD:
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valid_tiles = np.flatnonzero(mask["discard"])
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tile_id = int(self._random.choice(valid_tiles)) if len(valid_tiles) else 0
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if action_type == ACTION_DECLARE_PONG:
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valid_tiles = np.flatnonzero(mask["pong"])
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tile_id = int(self._random.choice(valid_tiles)) if len(valid_tiles) else 0
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if action_type == ACTION_DECLARE_KONG:
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valid_tiles = np.flatnonzero(mask["kong"])
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tile_id = int(self._random.choice(valid_tiles)) if len(valid_tiles) else 0
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if action_type == ACTION_DECLARE_CHI:
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valid_chi = np.flatnonzero(mask["chi"])
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chi_choice = int(self._random.choice(valid_chi)) if len(valid_chi) else 0
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return {"type": action_type, "tile": tile_id, "chi": chi_choice}
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def _action_mask(self) -> Dict[str, np.ndarray]:
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mask_type = np.zeros(6, dtype=bool)
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mask_discard = np.zeros(len(TILE_TYPES), dtype=bool)
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mask_pong = np.zeros(len(TILE_TYPES), dtype=bool)
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mask_kong = np.zeros(len(TILE_TYPES), dtype=bool)
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mask_chi = np.zeros(3, dtype=bool)
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agent = self.players[self.agent_index]
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counts = self._counts(agent.hand)
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if self.phase == PHASE_AGENT_TURN:
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mask_type[ACTION_DISCARD] = True
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for tile in agent.hand:
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mask_discard[tile] = True
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if is_win(agent.hand, len(agent.melds)):
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mask_type[ACTION_DECLARE_WIN] = True
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for tile_id, count in enumerate(counts):
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if count >= 4:
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mask_type[ACTION_DECLARE_KONG] = True
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mask_kong[tile_id] = True
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elif self.phase == PHASE_AGENT_RESPONSE and self.pending_discard is not None:
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mask_type[ACTION_PASS] = True
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_, tile = self.pending_discard
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virtual_hand = agent.hand + [tile]
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if is_win(virtual_hand, len(agent.melds)):
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mask_type[ACTION_DECLARE_WIN] = True
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if counts[tile] >= 2:
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mask_type[ACTION_DECLARE_PONG] = True
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mask_pong[tile] = True
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if counts[tile] >= 3:
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mask_type[ACTION_DECLARE_KONG] = True
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mask_kong[tile] = True
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if self._is_next_player(self.agent_index, self.pending_discard[0]):
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options = can_chi_options(counts, tile)
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if options:
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mask_type[ACTION_DECLARE_CHI] = True
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for option in options:
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mask_chi[option] = True
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return {
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"type": mask_type,
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"discard": mask_discard,
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"pong": mask_pong,
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"kong": mask_kong,
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"chi": mask_chi,
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}
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def _handle_agent_turn(self, action_type: int, tile_id: int) -> float:
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agent = self.players[self.agent_index]
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if action_type == ACTION_DECLARE_WIN:
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if is_win(agent.hand, len(agent.melds)):
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self._end_game(self.agent_index, "self_draw")
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return 0.0
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if action_type == ACTION_DECLARE_KONG:
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if self._can_concealed_kong(agent, tile_id):
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self._make_kong(self.agent_index, tile_id, concealed=True)
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self._draw_tile(self.agent_index)
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self.skip_draw_for_player = self.agent_index
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self.phase = PHASE_AGENT_TURN
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return 0.0
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if action_type == ACTION_DISCARD:
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if tile_id in agent.hand:
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agent.hand.remove(tile_id)
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agent.discards.append(tile_id)
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self.pending_discard = (self.agent_index, tile_id)
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self._log_event(
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"discard",
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player=self.agent_index,
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tile_id=tile_id,
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)
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self._resolve_discard()
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return 0.0
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return 0.0
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def _handle_agent_response(self, action_type: int, tile_id: int, chi_choice: int) -> float:
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if self.pending_discard is None:
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self.phase = PHASE_AGENT_TURN
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return 0.0
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discarder, tile = self.pending_discard
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agent = self.players[self.agent_index]
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counts = self._counts(agent.hand)
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if action_type == ACTION_DECLARE_WIN:
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if is_win(agent.hand + [tile], len(agent.melds)):
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self._end_game(self.agent_index, "ron")
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return 0.0
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if action_type == ACTION_DECLARE_PONG:
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if counts[tile] >= 2:
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self._consume_discard(discarder, tile)
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agent.hand.remove(tile)
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agent.hand.remove(tile)
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agent.melds.append([tile, tile, tile])
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self.current_player = self.agent_index
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self.skip_draw_for_player = self.agent_index
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self.pending_discard = None
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self._log_event(
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"claim",
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player=self.agent_index,
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claim="pong",
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tile_id=tile,
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from_player=discarder,
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)
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self.phase = PHASE_AGENT_TURN
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return 0.0
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if action_type == ACTION_DECLARE_KONG:
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if counts[tile] >= 3:
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self._consume_discard(discarder, tile)
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for _ in range(3):
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agent.hand.remove(tile)
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agent.melds.append([tile, tile, tile, tile])
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self.current_player = self.agent_index
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self.skip_draw_for_player = self.agent_index
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self.pending_discard = None
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self._draw_tile(self.agent_index)
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self._log_event(
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"claim",
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player=self.agent_index,
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claim="kong",
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tile_id=tile,
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from_player=discarder,
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)
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self.phase = PHASE_AGENT_TURN
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return 0.0
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if action_type == ACTION_DECLARE_CHI:
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if self._is_next_player(self.agent_index, discarder):
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options = can_chi_options(counts, tile)
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if chi_choice in options:
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self._consume_discard(discarder, tile)
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if chi_choice == 0:
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chi_tiles = [tile - 2, tile - 1, tile]
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elif chi_choice == 1:
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chi_tiles = [tile - 1, tile, tile + 1]
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else:
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chi_tiles = [tile, tile + 1, tile + 2]
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for chi_tile in chi_tiles:
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if chi_tile != tile:
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agent.hand.remove(chi_tile)
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agent.melds.append(chi_tiles)
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self.current_player = self.agent_index
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self.skip_draw_for_player = self.agent_index
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self.pending_discard = None
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self._log_event(
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"claim",
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player=self.agent_index,
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claim="chi",
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tile_id=tile,
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from_player=discarder,
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)
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self.phase = PHASE_AGENT_TURN
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return 0.0
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self.pending_discard = None
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self.phase = PHASE_AGENT_TURN
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self._resolve_discard(after_pass=True, original_discarder=discarder, tile=tile)
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return 0.0
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def _advance_to_agent(self):
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while not self.done:
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if self.phase == PHASE_AGENT_RESPONSE:
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return
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if self.current_player == self.agent_index:
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self._start_turn(self.agent_index)
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if self.done:
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return
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self.phase = PHASE_AGENT_TURN
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return
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self._npc_turn(self.current_player)
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if self.done or self.phase == PHASE_AGENT_RESPONSE:
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return
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def _npc_turn(self, player_idx: int):
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self._start_turn(player_idx)
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if self.done:
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return
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player = self.players[player_idx]
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if is_win(player.hand, len(player.melds)):
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self._end_game(player_idx, "self_draw")
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return
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tile = self._random.choice(player.hand)
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player.hand.remove(tile)
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player.discards.append(tile)
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self.pending_discard = (player_idx, tile)
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self._log_event(
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"discard",
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player=player_idx,
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tile_id=tile,
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)
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self._resolve_discard()
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def _resolve_discard(self, after_pass: bool = False, original_discarder: Optional[int] = None, tile: Optional[int] = None):
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if self.pending_discard is None and not after_pass:
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return
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discarder, discarded_tile = self.pending_discard if self.pending_discard is not None else (original_discarder, tile)
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if discarder is None or discarded_tile is None:
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return
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if discarder != self.agent_index and not after_pass:
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if self._agent_can_respond(discarder, discarded_tile):
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self.pending_discard = (discarder, discarded_tile)
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self.phase = PHASE_AGENT_RESPONSE
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return
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winner = self._npc_win_on_discard(discarder, discarded_tile)
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if winner is not None:
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self._end_game(winner, "ron")
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return
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claim = self._npc_claim(discarder, discarded_tile)
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if claim is not None:
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self.pending_discard = None
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self._apply_npc_claim(*claim)
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return
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self.pending_discard = None
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self.current_player = (discarder + 1) % 4
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def _agent_can_respond(self, discarder: int, tile: int) -> bool:
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agent = self.players[self.agent_index]
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counts = self._counts(agent.hand)
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if is_win(agent.hand + [tile], len(agent.melds)):
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return True
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if counts[tile] >= 2:
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return True
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if counts[tile] >= 3:
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return True
|
||||
if self._is_next_player(self.agent_index, discarder):
|
||||
return bool(can_chi_options(counts, tile))
|
||||
return False
|
||||
|
||||
def _npc_win_on_discard(self, discarder: int, tile: int) -> Optional[int]:
|
||||
for offset in range(1, 4):
|
||||
player_idx = (discarder + offset) % 4
|
||||
if player_idx == self.agent_index:
|
||||
continue
|
||||
player = self.players[player_idx]
|
||||
if is_win(player.hand + [tile], len(player.melds)):
|
||||
return player_idx
|
||||
return None
|
||||
|
||||
def _npc_claim(self, discarder: int, tile: int):
|
||||
for offset in range(1, 4):
|
||||
player_idx = (discarder + offset) % 4
|
||||
if player_idx == self.agent_index:
|
||||
continue
|
||||
player = self.players[player_idx]
|
||||
counts = self._counts(player.hand)
|
||||
if counts[tile] >= 3:
|
||||
return (player_idx, "kong", tile, None, discarder)
|
||||
if counts[tile] >= 2:
|
||||
return (player_idx, "pong", tile, None, discarder)
|
||||
next_player = (discarder + 1) % 4
|
||||
if next_player != self.agent_index:
|
||||
player = self.players[next_player]
|
||||
options = can_chi_options(self._counts(player.hand), tile)
|
||||
if options:
|
||||
return (next_player, "chi", tile, options[0], discarder)
|
||||
return None
|
||||
|
||||
def _apply_npc_claim(
|
||||
self,
|
||||
player_idx: int,
|
||||
claim_type: str,
|
||||
tile: int,
|
||||
chi_choice: Optional[int],
|
||||
discarder: int,
|
||||
):
|
||||
player = self.players[player_idx]
|
||||
self._consume_discard(discarder, tile)
|
||||
if claim_type == "pong":
|
||||
player.hand.remove(tile)
|
||||
player.hand.remove(tile)
|
||||
player.melds.append([tile, tile, tile])
|
||||
self.current_player = player_idx
|
||||
self.skip_draw_for_player = player_idx
|
||||
elif claim_type == "kong":
|
||||
for _ in range(3):
|
||||
player.hand.remove(tile)
|
||||
player.melds.append([tile, tile, tile, tile])
|
||||
self.current_player = player_idx
|
||||
self.skip_draw_for_player = player_idx
|
||||
self._draw_tile(player_idx)
|
||||
elif claim_type == "chi" and chi_choice is not None:
|
||||
if chi_choice == 0:
|
||||
chi_tiles = [tile - 2, tile - 1, tile]
|
||||
elif chi_choice == 1:
|
||||
chi_tiles = [tile - 1, tile, tile + 1]
|
||||
else:
|
||||
chi_tiles = [tile, tile + 1, tile + 2]
|
||||
for chi_tile in chi_tiles:
|
||||
if chi_tile != tile:
|
||||
player.hand.remove(chi_tile)
|
||||
player.melds.append(chi_tiles)
|
||||
self.current_player = player_idx
|
||||
self.skip_draw_for_player = player_idx
|
||||
self._log_event(
|
||||
"claim",
|
||||
player=player_idx,
|
||||
claim=claim_type,
|
||||
tile_id=tile,
|
||||
from_player=discarder,
|
||||
)
|
||||
|
||||
def _draw_tile(self, player_idx: int):
|
||||
while self.wall:
|
||||
tile = self.wall.pop()
|
||||
if is_flower(tile):
|
||||
self.players[player_idx].flowers.append(tile)
|
||||
continue
|
||||
self.players[player_idx].hand.append(tile)
|
||||
return tile
|
||||
self._end_game(None, "wall_empty")
|
||||
return None
|
||||
|
||||
def _start_turn(self, player_idx: int):
|
||||
if self.skip_draw_for_player == player_idx:
|
||||
self.skip_draw_for_player = None
|
||||
return
|
||||
self._draw_tile(player_idx)
|
||||
|
||||
def _make_kong(self, player_idx: int, tile_id: int, concealed: bool):
|
||||
player = self.players[player_idx]
|
||||
for _ in range(4):
|
||||
player.hand.remove(tile_id)
|
||||
player.melds.append([tile_id] * 4)
|
||||
|
||||
def _can_concealed_kong(self, player: PlayerState, tile_id: int) -> bool:
|
||||
return player.hand.count(tile_id) >= 4
|
||||
|
||||
def _counts(self, tiles: List[int]) -> np.ndarray:
|
||||
counts = np.zeros(len(TILE_TYPES), dtype=np.int8)
|
||||
for tile in tiles:
|
||||
counts[tile] += 1
|
||||
return counts
|
||||
|
||||
def _is_next_player(self, player: int, discarder: int) -> bool:
|
||||
return player == (discarder + 1) % 4
|
||||
|
||||
def _consume_discard(self, discarder: int, tile: int):
|
||||
discards = self.players[discarder].discards
|
||||
if discards and discards[-1] == tile:
|
||||
discards.pop()
|
||||
|
||||
def _end_game(self, winner: Optional[int], reason: str):
|
||||
if self.done:
|
||||
return
|
||||
self.done = True
|
||||
self.winner = winner
|
||||
self.terminal_reason = reason
|
||||
self._log_event(
|
||||
"win" if winner is not None else "draw",
|
||||
player=winner,
|
||||
reason=reason,
|
||||
)
|
||||
|
||||
def _snapshot(self) -> Dict[str, object]:
|
||||
return {
|
||||
"hands": [[tile_name(tile) for tile in sorted(p.hand)] for p in self.players],
|
||||
"discards": [[tile_name(tile) for tile in p.discards] for p in self.players],
|
||||
"melds": [[[tile_name(tile) for tile in meld] for meld in p.melds] for p in self.players],
|
||||
"flowers": [[tile_name(tile) for tile in p.flowers] for p in self.players],
|
||||
"wall_count": len(self.wall),
|
||||
"current_player": self.current_player,
|
||||
}
|
||||
|
||||
def _log_event(self, event_type: str, **payload: object):
|
||||
event = {
|
||||
"id": len(self.event_log),
|
||||
"type": event_type,
|
||||
"snapshot": self._snapshot(),
|
||||
}
|
||||
event.update(payload)
|
||||
if "tile_id" in event:
|
||||
event["tile"] = tile_name(int(event["tile_id"]))
|
||||
self.event_log.append(event)
|
||||
Reference in New Issue
Block a user