47 lines
1.7 KiB
Python
47 lines
1.7 KiB
Python
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import random
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from scipy.stats import binom
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from engine import LiarsDiceEngine, Bid
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class BotAi:
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def ai_turn(self, game_state: LiarsDiceEngine) -> Bid | None:
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bid = game_state.current_bid or Bid(die_face=1, num_dice=0)
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# Challenge a bid if we deem it sufficiently unlikely, based on the statistical odds of the bid being true. Do
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# not hardcode a value to avoid the AI always reacting in a predetermined manner.
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if (
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self.calculate_odds(game_state, bid.die_face, bid.num_dice)
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< random.uniform(0.1, 0.5)
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):
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return None
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max_confidence = 0
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max_confidence_bids = []
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for d in range(bid.die_face, 7):
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for n in range(1, game_state.num_all_dice):
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if (d == bid.die_face and n > bid.num_dice) or d > bid.die_face:
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confidence = self.calculate_odds(game_state, d, n)
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if confidence == max_confidence:
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max_confidence_bids.append(Bid(d, n))
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elif confidence > max_confidence:
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max_confidence = confidence
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max_confidence_bids = [Bid(d, n)]
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return random.choice(max_confidence_bids) if max_confidence_bids else None
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@staticmethod
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def calculate_odds(game_state: LiarsDiceEngine, die_face: int, num_values: int) -> float:
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num_minimum_needed_values = (
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num_values - game_state.dice[game_state.active_player_index][die_face] - 1
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)
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die_face_probability = 2.0 / 6 if game_state.wild_ones_variant else 1.0 / 6
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return binom.sf(
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k=num_minimum_needed_values,
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n=game_state.num_opponent_dice,
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p=die_face_probability,
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)
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