{"id":1102173,"date":"2025-01-08T15:57:09","date_gmt":"2025-01-08T07:57:09","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1102173.html"},"modified":"2025-01-08T15:57:13","modified_gmt":"2025-01-08T07:57:13","slug":"%e5%9c%a8python%e4%b8%ad%e5%a6%82%e4%bd%95%e4%bd%bf%e4%ba%95%e5%ad%97%e6%a3%8b%e6%99%ba%e8%83%bd-2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1102173.html","title":{"rendered":"\u5728python\u4e2d\u5982\u4f55\u4f7f\u4e95\u5b57\u68cb\u667a\u80fd"},"content":{"rendered":"<p style=\"text-align:center;\" ><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/25064606\/5a3d7174-5b66-4655-ab5f-3eff4e850da2.webp\" alt=\"\u5728python\u4e2d\u5982\u4f55\u4f7f\u4e95\u5b57\u68cb\u667a\u80fd\" \/><\/p>\n<p><p> \u5728Python\u4e2d\uff0c\u4f7f\u4e95\u5b57\u68cb\u667a\u80fd\u7684\u65b9\u6cd5\u6709\u5f88\u591a\u79cd\uff0c<strong>\u5305\u62ec\u4f7f\u7528Minimax\u7b97\u6cd5\u3001Alpha-beta\u526a\u679d\u3001\u5f3a\u5316\u5b66\u4e60<\/strong>\u7b49\u3002<strong>Minimax\u7b97\u6cd5<\/strong>\u662f\u4e00\u79cd\u5e38\u7528\u4e14\u6709\u6548\u7684\u65b9\u6cd5\uff0c\u5b83\u901a\u8fc7\u9012\u5f52\u8ba1\u7b97\u51fa\u6bcf\u4e00\u6b65\u7684\u6700\u4f18\u89e3\uff0c\u4ece\u800c\u786e\u4fdd<a href=\"https:\/\/docs.pingcode.com\/blog\/59162.html\" target=\"_blank\">AI<\/a>\u9009\u62e9\u6700\u4f18\u7b56\u7565\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u63cf\u8ff0Minimax\u7b97\u6cd5\u7684\u5b9e\u73b0\u65b9\u6cd5\u3002<\/p>\n<\/p>\n<p><p><strong>Minimax\u7b97\u6cd5\u662f\u4e00\u79cd\u51b3\u7b56\u89c4\u5219<\/strong>\uff0c\u9002\u7528\u4e8e\u4e24\u4eba\u5bf9\u5f08\u6e38\u620f\u3002\u5b83\u7684\u6838\u5fc3\u601d\u60f3\u662f\uff1a\u5047\u8bbe\u5bf9\u624b\u4e5f\u5728\u505a\u51fa\u6700\u4f18\u9009\u62e9\uff0c\u7136\u540e\u9012\u5f52\u8ba1\u7b97\u51fa\u6bcf\u4e00\u6b65\u7684\u5f97\u5206\uff0c\u4ece\u800c\u786e\u5b9a\u5f53\u524d\u6700\u4f18\u7684\u79fb\u52a8\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001Minimax\u7b97\u6cd5\u7684\u57fa\u672c\u6982\u5ff5<\/h3>\n<\/p>\n<p><p>Minimax\u7b97\u6cd5\u662f\u4e00\u79cd\u9012\u5f52\u7b97\u6cd5\uff0c\u4e3b\u8981\u7528\u4e8e\u4e24\u4eba\u96f6\u548c\u6e38\u620f\u4e2d\u3002\u5b83\u7684\u540d\u5b57\u6e90\u4e8e\u201cMinimize the possible loss for a worst-case scenario\u201d\uff08\u6700\u5c0f\u5316\u6700\u574f\u60c5\u51b5\u4e0b\u7684\u635f\u5931\uff09\u3002\u8be5\u7b97\u6cd5\u7684\u6838\u5fc3\u601d\u60f3\u662f\u5728\u6bcf\u4e00\u6b65\u9009\u62e9\u4e2d\uff0c\u5047\u8bbe\u5bf9\u624b\u4e5f\u5728\u505a\u51fa\u6700\u4f18\u9009\u62e9\uff0c\u4ece\u800c\u9012\u5f52\u5730\u8bc4\u4f30\u6bcf\u4e00\u4e2a\u53ef\u80fd\u7684\u5c40\u9762\u3002<\/p>\n<\/p>\n<p><h4>1\u3001\u6e38\u620f\u72b6\u6001\u8868\u793a<\/h4>\n<\/p>\n<p><p>\u4e95\u5b57\u68cb\u7684\u6e38\u620f\u72b6\u6001\u901a\u5e38\u53ef\u4ee5\u8868\u793a\u4e3a\u4e00\u4e2a3&#215;3\u7684\u4e8c\u7ef4\u6570\u7ec4\uff0c\u6bcf\u4e2a\u5143\u7d20\u53ef\u4ee5\u662f&#39;X&#39;, &#39;O&#39;\u6216\u8005\u7a7a\u503c\u3002\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">board = [<\/p>\n<p>    [&#39;X&#39;, &#39;O&#39;, &#39;X&#39;],<\/p>\n<p>    [&#39;O&#39;, &#39;X&#39;, &#39;&#39;],<\/p>\n<p>    [&#39;O&#39;, &#39;&#39;, &#39;&#39;]<\/p>\n<p>]<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2\u3001\u80dc\u8d1f\u5224\u5b9a<\/h4>\n<\/p>\n<p><p>\u5728\u6bcf\u4e00\u6b65\u51b3\u7b56\u4e2d\uff0c\u9700\u8981\u5224\u65ad\u5f53\u524d\u5c40\u9762\u662f\u5426\u5df2\u7ecf\u5206\u51fa\u80dc\u8d1f\uff0c\u6216\u8005\u662f\u5426\u5e73\u5c40\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u80dc\u8d1f\u5224\u5b9a\u51fd\u6570\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">def check_winner(board):<\/p>\n<p>    # \u68c0\u67e5\u884c<\/p>\n<p>    for row in board:<\/p>\n<p>        if row[0] == row[1] == row[2] and row[0] != &#39;&#39;:<\/p>\n<p>            return row[0]<\/p>\n<p>    # \u68c0\u67e5\u5217<\/p>\n<p>    for col in range(3):<\/p>\n<p>        if board[0][col] == board[1][col] == board[2][col] and board[0][col] != &#39;&#39;:<\/p>\n<p>            return board[0][col]<\/p>\n<p>    # \u68c0\u67e5\u5bf9\u89d2\u7ebf<\/p>\n<p>    if board[0][0] == board[1][1] == board[2][2] and board[0][0] != &#39;&#39;:<\/p>\n<p>        return board[0][0]<\/p>\n<p>    if board[0][2] == board[1][1] == board[2][0] and board[0][2] != &#39;&#39;:<\/p>\n<p>        return board[0][2]<\/p>\n<p>    # \u68c0\u67e5\u5e73\u5c40<\/p>\n<p>    if all(board[row][col] != &#39;&#39; for row in range(3) for col in range(3)):<\/p>\n<p>        return &#39;Tie&#39;<\/p>\n<p>    return None<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e8c\u3001Minimax\u7b97\u6cd5\u5b9e\u73b0<\/h3>\n<\/p>\n<p><h4>1\u3001Minimax\u7b97\u6cd5\u7684\u9012\u5f52\u51fd\u6570<\/h4>\n<\/p>\n<p><p>Minimax\u7b97\u6cd5\u7684\u6838\u5fc3\u662f\u4e00\u4e2a\u9012\u5f52\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u8bc4\u4f30\u5f53\u524d\u5c40\u9762\u7684\u5206\u6570\uff0c\u5e76\u8fd4\u56de\u6700\u4f18\u7684\u79fb\u52a8\u3002\u4ee5\u4e0b\u662fMinimax\u7b97\u6cd5\u7684\u5b9e\u73b0\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">def minimax(board, depth, is_maximizing):<\/p>\n<p>    result = check_winner(board)<\/p>\n<p>    if result == &#39;X&#39;:<\/p>\n<p>        return -1<\/p>\n<p>    elif result == &#39;O&#39;:<\/p>\n<p>        return 1<\/p>\n<p>    elif result == &#39;Tie&#39;:<\/p>\n<p>        return 0<\/p>\n<p>    if is_maximizing:<\/p>\n<p>        best_score = -float(&#39;inf&#39;)<\/p>\n<p>        for row in range(3):<\/p>\n<p>            for col in range(3):<\/p>\n<p>                if board[row][col] == &#39;&#39;:<\/p>\n<p>                    board[row][col] = &#39;O&#39;<\/p>\n<p>                    score = minimax(board, depth + 1, False)<\/p>\n<p>                    board[row][col] = &#39;&#39;<\/p>\n<p>                    best_score = max(score, best_score)<\/p>\n<p>        return best_score<\/p>\n<p>    else:<\/p>\n<p>        best_score = float(&#39;inf&#39;)<\/p>\n<p>        for row in range(3):<\/p>\n<p>            for col in range(3):<\/p>\n<p>                if board[row][col] == &#39;&#39;:<\/p>\n<p>                    board[row][col] = &#39;X&#39;<\/p>\n<p>                    score = minimax(board, depth + 1, True)<\/p>\n<p>                    board[row][col] = &#39;&#39;<\/p>\n<p>                    best_score = min(score, best_score)<\/p>\n<p>        return best_score<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2\u3001\u5bfb\u627e\u6700\u4f73\u79fb\u52a8<\/h4>\n<\/p>\n<p><p>\u5728\u6bcf\u4e00\u6b65\u4e2d\uff0cAI\u9700\u8981\u904d\u5386\u6240\u6709\u53ef\u80fd\u7684\u79fb\u52a8\uff0c\u5e76\u4f7f\u7528Minimax\u7b97\u6cd5\u8bc4\u4f30\u6bcf\u4e00\u4e2a\u79fb\u52a8\u7684\u5206\u6570\uff0c\u4ece\u800c\u9009\u62e9\u5f97\u5206\u6700\u9ad8\u7684\u79fb\u52a8\u3002\u4ee5\u4e0b\u662f\u5bfb\u627e\u6700\u4f73\u79fb\u52a8\u7684\u51fd\u6570\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">def find_best_move(board):<\/p>\n<p>    best_score = -float(&#39;inf&#39;)<\/p>\n<p>    best_move = None<\/p>\n<p>    for row in range(3):<\/p>\n<p>        for col in range(3):<\/p>\n<p>            if board[row][col] == &#39;&#39;:<\/p>\n<p>                board[row][col] = &#39;O&#39;<\/p>\n<p>                score = minimax(board, 0, False)<\/p>\n<p>                board[row][col] = &#39;&#39;<\/p>\n<p>                if score &gt; best_score:<\/p>\n<p>                    best_score = score<\/p>\n<p>                    best_move = (row, col)<\/p>\n<p>    return best_move<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e09\u3001\u4f18\u5316\u548c\u6539\u8fdb<\/h3>\n<\/p>\n<p><p>\u867d\u7136Minimax\u7b97\u6cd5\u80fd\u591f\u786e\u4fddAI\u5728\u4e95\u5b57\u68cb\u4e2d\u505a\u51fa\u6700\u4f18\u9009\u62e9\uff0c\u4f46\u5b83\u7684\u8ba1\u7b97\u590d\u6742\u5ea6\u8f83\u9ad8\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u6cd5\u8fdb\u884c\u4f18\u5316\uff1a<\/p>\n<\/p>\n<p><h4>1\u3001Alpha-beta\u526a\u679d<\/h4>\n<\/p>\n<p><p>Alpha-beta\u526a\u679d\u662f\u4e00\u79cd\u5bf9Minimax\u7b97\u6cd5\u7684\u4f18\u5316\uff0c\u80fd\u591f\u51cf\u5c11\u641c\u7d22\u7a7a\u95f4\uff0c\u4ece\u800c\u63d0\u9ad8\u7b97\u6cd5\u7684\u6548\u7387\u3002\u5b83\u901a\u8fc7\u5728\u641c\u7d22\u8fc7\u7a0b\u4e2d\u526a\u53bb\u4e0d\u5fc5\u8981\u7684\u5206\u652f\uff0c\u51cf\u5c11\u8ba1\u7b97\u91cf\u3002\u4ee5\u4e0b\u662f\u5f15\u5165Alpha-beta\u526a\u679d\u540e\u7684Minimax\u7b97\u6cd5\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">def minimax(board, depth, alpha, beta, is_maximizing):<\/p>\n<p>    result = check_winner(board)<\/p>\n<p>    if result == &#39;X&#39;:<\/p>\n<p>        return -1<\/p>\n<p>    elif result == &#39;O&#39;:<\/p>\n<p>        return 1<\/p>\n<p>    elif result == &#39;Tie&#39;:<\/p>\n<p>        return 0<\/p>\n<p>    if is_maximizing:<\/p>\n<p>        best_score = -float(&#39;inf&#39;)<\/p>\n<p>        for row in range(3):<\/p>\n<p>            for col in range(3):<\/p>\n<p>                if board[row][col] == &#39;&#39;:<\/p>\n<p>                    board[row][col] = &#39;O&#39;<\/p>\n<p>                    score = minimax(board, depth + 1, alpha, beta, False)<\/p>\n<p>                    board[row][col] = &#39;&#39;<\/p>\n<p>                    best_score = max(score, best_score)<\/p>\n<p>                    alpha = max(alpha, score)<\/p>\n<p>                    if beta &lt;= alpha:<\/p>\n<p>                        break<\/p>\n<p>        return best_score<\/p>\n<p>    else:<\/p>\n<p>        best_score = float(&#39;inf&#39;)<\/p>\n<p>        for row in range(3):<\/p>\n<p>            for col in range(3):<\/p>\n<p>                if board[row][col] == &#39;&#39;:<\/p>\n<p>                    board[row][col] = &#39;X&#39;<\/p>\n<p>                    score = minimax(board, depth + 1, alpha, beta, True)<\/p>\n<p>                    board[row][col] = &#39;&#39;<\/p>\n<p>                    best_score = min(score, best_score)<\/p>\n<p>                    beta = min(beta, score)<\/p>\n<p>                    if beta &lt;= alpha:<\/p>\n<p>                        break<\/p>\n<p>        return best_score<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2\u3001\u542f\u53d1\u5f0f\u8bc4\u4f30\u51fd\u6570<\/h4>\n<\/p>\n<p><p>\u5728\u590d\u6742\u7684\u6e38\u620f\u4e2d\uff0c\u5982\u56fd\u9645\u8c61\u68cb\uff0c\u76f4\u63a5\u4f7f\u7528Minimax\u7b97\u6cd5\u8bc4\u4f30\u6574\u4e2a\u641c\u7d22\u6811\u662f\u4e0d\u53ef\u884c\u7684\u3002\u6b64\u65f6\uff0c\u53ef\u4ee5\u5f15\u5165\u542f\u53d1\u5f0f\u8bc4\u4f30\u51fd\u6570\uff0c\u5bf9\u5c40\u9762\u8fdb\u884c\u5feb\u901f\u8bc4\u4f30\uff0c\u4ece\u800c\u51cf\u5c11\u8ba1\u7b97\u91cf\u3002\u5728\u4e95\u5b57\u68cb\u4e2d\uff0c\u7531\u4e8e\u641c\u7d22\u7a7a\u95f4\u8f83\u5c0f\uff0c\u542f\u53d1\u5f0f\u8bc4\u4f30\u51fd\u6570\u7684\u5f15\u5165\u610f\u4e49\u4e0d\u5927\uff0c\u4f46\u5728\u5176\u4ed6\u590d\u6742\u6e38\u620f\u4e2d\uff0c\u8fd9\u662f\u5e38\u7528\u7684\u4f18\u5316\u65b9\u6cd5\u3002<\/p>\n<\/p>\n<p><h3>\u56db\u3001\u5f3a\u5316\u5b66\u4e60\u5728\u4e95\u5b57\u68cb\u4e2d\u7684\u5e94\u7528<\/h3>\n<\/p>\n<p><p>\u9664\u4e86\u4f20\u7edf\u7684Minimax\u7b97\u6cd5\uff0c\u5f3a\u5316\u5b66\u4e60\uff08Reinforcement Learning, RL\uff09\u4e5f\u662f\u4e00\u79cd\u5e38\u7528\u7684AI\u8bad\u7ec3\u65b9\u6cd5\u3002\u901a\u8fc7\u4e0e\u73af\u5883\u4e0d\u65ad\u4e92\u52a8\uff0c\u5f3a\u5316\u5b66\u4e60\u7b97\u6cd5\u80fd\u591f\u9010\u6b65\u63d0\u5347AI\u7684\u7b56\u7565\u9009\u62e9\u80fd\u529b\u3002\u5728\u4e95\u5b57\u68cb\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528Q-learning\u7b49\u5f3a\u5316\u5b66\u4e60\u7b97\u6cd5\u8bad\u7ec3AI\u3002<\/p>\n<\/p>\n<p><h4>1\u3001Q-learning\u57fa\u672c\u6982\u5ff5<\/h4>\n<\/p>\n<p><p>Q-learning\u662f\u4e00\u79cd\u65e0\u6a21\u578b\u7684\u5f3a\u5316\u5b66\u4e60\u7b97\u6cd5\uff0c\u901a\u8fc7\u5b66\u4e60\u72b6\u6001-\u52a8\u4f5c\u503c\u51fd\u6570\uff08Q\u51fd\u6570\uff09\u6765\u9009\u62e9\u6700\u4f18\u7b56\u7565\u3002Q\u51fd\u6570\u8868\u793a\u5728\u7ed9\u5b9a\u72b6\u6001\u4e0b\u6267\u884c\u67d0\u4e2a\u52a8\u4f5c\u7684\u9884\u671f\u7d2f\u79ef\u5956\u52b1\u3002Q-learning\u901a\u8fc7\u4e0d\u65ad\u66f4\u65b0Q\u503c\uff0c\u4ece\u800c\u9010\u6b65\u903c\u8fd1\u6700\u4f18\u7b56\u7565\u3002<\/p>\n<\/p>\n<p><h4>2\u3001Q-learning\u7b97\u6cd5\u5b9e\u73b0<\/h4>\n<\/p>\n<p><p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684Q-learning\u7b97\u6cd5\u5b9e\u73b0\u793a\u4f8b\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">import numpy as np<\/p>\n<p>import random<\/p>\n<h2><strong>\u521d\u59cb\u5316Q\u8868<\/strong><\/h2>\n<p>Q = np.zeros((39, 9))<\/p>\n<h2><strong>\u5b9a\u4e49\u5b66\u4e60\u7387\u548c\u6298\u6263\u56e0\u5b50<\/strong><\/h2>\n<p>alpha = 0.1<\/p>\n<p>gamma = 0.9<\/p>\n<h2><strong>\u5b9a\u4e49epsilon-greedy\u7b56\u7565\u4e2d\u7684epsilon\u503c<\/strong><\/h2>\n<p>epsilon = 0.1<\/p>\n<p>def state_to_index(state):<\/p>\n<p>    index = 0<\/p>\n<p>    for i in range(9):<\/p>\n<p>        if state[i] == &#39;X&#39;:<\/p>\n<p>            index += 3i<\/p>\n<p>        elif state[i] == &#39;O&#39;:<\/p>\n<p>            index += 2 * 3i<\/p>\n<p>    return index<\/p>\n<p>def choose_action(state, epsilon):<\/p>\n<p>    if random.uniform(0, 1) &lt; epsilon:<\/p>\n<p>        return random.choice([i for i, x in enumerate(state) if x == &#39;&#39;])<\/p>\n<p>    else:<\/p>\n<p>        state_index = state_to_index(state)<\/p>\n<p>        return np.argmax(Q[state_index])<\/p>\n<p>def update_q_table(state, action, reward, next_state):<\/p>\n<p>    state_index = state_to_index(state)<\/p>\n<p>    next_state_index = state_to_index(next_state)<\/p>\n<p>    best_next_action = np.argmax(Q[next_state_index])<\/p>\n<p>    td_target = reward + gamma * Q[next_state_index][best_next_action]<\/p>\n<p>    Q[state_index][action] = Q[state_index][action] + alpha * (td_target - Q[state_index][action])<\/p>\n<h2><strong>\u8bad\u7ec3\u8fc7\u7a0b<\/strong><\/h2>\n<p>for episode in range(10000):<\/p>\n<p>    state = [&#39;&#39;] * 9<\/p>\n<p>    done = False<\/p>\n<p>    while not done:<\/p>\n<p>        action = choose_action(state, epsilon)<\/p>\n<p>        next_state = state.copy()<\/p>\n<p>        next_state[action] = &#39;O&#39;<\/p>\n<p>        reward = 0<\/p>\n<p>        if check_winner(next_state) == &#39;O&#39;:<\/p>\n<p>            reward = 1<\/p>\n<p>            done = True<\/p>\n<p>        elif &#39;&#39; not in next_state:<\/p>\n<p>            done = True<\/p>\n<p>        else:<\/p>\n<p>            opponent_action = random.choice([i for i, x in enumerate(next_state) if x == &#39;&#39;])<\/p>\n<p>            next_state[opponent_action] = &#39;X&#39;<\/p>\n<p>            if check_winner(next_state) == &#39;X&#39;:<\/p>\n<p>                reward = -1<\/p>\n<p>                done = True<\/p>\n<p>        update_q_table(state, action, reward, next_state)<\/p>\n<p>        state = 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