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```python import numpy as np import random # ç°å¢ãå®çŸ© environment = { (0, 0): {'right': 0, 'down': 0}, (0, 1): {'left': 0, 'right': 0, 'down': 0}, (0, 2): {'left': 0, 'down': 0, 'right': 10}, # ãŽãŒã«ç¶æ (1, 0): {'up': 0, 'down': 0, 'right': 0}, (1, 1): {'up': 0, 'down': 0, 'left': 0, 'right': 0}, (1, 2): {'up': 0, 'left': 0, 'down': -5}, # ããã«ãã£ç¶æ (2, 0): {'up': 0, 'right': 0}, (2, 1): {'up': 0, 'left': 0, 'right': 0}, (2, 2): {'up': -5, 'left': 0} } # åãããè¡å actions = ['up', 'down', 'left', 'right'] # ç¹å®ã®ç¶æ ã§åãããè¡åãååŸãã颿° def get_possible_actions(state): return list(environment[state].keys()) # ç¹å®ã®ç¶æ ãšè¡åã«å¯Ÿããå ±é ¬ãååŸãã颿° def get_reward(state, action): if action in environment[state]: return environment[state][action] else: return -10 # ç¡å¹ãªè¡åã«å¯Ÿãã倧ããªè² ã®å ±é ¬ # çŸåšã®ç¶æ ãšè¡åããæ¬¡ã®ç¶æ ãæ±ºå®ãã颿° def get_next_state(state, action): row, col = state if action == 'up': next_state = (row - 1, col) elif action == 'down': next_state = (row + 1, col) elif action == 'left': next_state = (row, col - 1) elif action == 'right': next_state = (row, col + 1) else: return state # ç¡å¹ãªè¡åã®åŠç if next_state in environment: return next_state else: return state # ç¯å²å€ã®ç§»åã®å Žåã¯åãç¶æ ã«çãŸã # QããŒãã«ãåæå q_table = {} for state in environment: q_table[state] = {action: 0 for action in actions} # QåŠç¿ã®ãã©ã¡ãŒã¿ alpha = 0.1 # åŠç¿ç gamma = 0.9 # å²åŒç epsilon = 0.1 # æ¢çŽ¢ç num_episodes = 1000 # QåŠç¿ã¢ã«ãŽãªãºã for episode in range(num_episodes): # ã©ã³ãã ãªç¶æ ããéå§ state = random.choice(list(environment.keys())) done = False while not done: # ã€ãã·ãã³-ã°ãªãŒãã£æ³ã«ããè¡åéžæ if random.uniform(0, 1) < epsilon: # æ¢çŽ¢ïŒã©ã³ãã ãªè¡åãéžæ action = random.choice(get_possible_actions(state)) else: # 掻çšïŒæãé«ãQå€ãæã€è¡åãéžæ action = max(q_table[state], key=q_table[state].get) # è¡åãåããå ±é ¬ãšæ¬¡ã®ç¶æ ã芳枬 next_state = get_next_state(state, action) reward = get_reward(state, action) # Qå€ãæŽæ° best_next_q = max(q_table[next_state].values()) q_table[state][action] += alpha * (reward + gamma * best_next_q - q_table[state][action]) # ç¶æ ãæŽæ° state = next_state # ãŽãŒã«ã«å°éãããç¢ºèª if state == (0, 2): # ãŽãŒã«ç¶æ done = True # QããŒãã«ã®è¡šç€ºïŒä»»æïŒ # for state, action_values in q_table.items(): # print(f"State: {state}, Q-values: {action_values}") # åŠç¿æžã¿æ¹çããã¹ã start_state = (0, 0) current_state = start_state path = [start_state] print("åŠç¿æžã¿æ¹çã®ãã¹ã (0,0)ãã:") while current_state != (0, 2): action = max(q_table[current_state], key=q_table[current_state].get) current_state = get_next_state(current_state, action) path.append(current_state) print("蟿ã£ãçµè·¯:", path) ```解説ïŒ
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