优化搜索算法:从十亿结点到每步十种选择

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资源摘要信息:"gk.rar_10-MT-94 GK" 标题: "gk.rar_10-MT-94 GK" 暗示了文件可能包含与某个特定版本或特定问题集(标记为"MT-94")有关的资料。标题中的“GK”可能代表“游戏知识”(Game Knowledge)或与特定领域相关的问题(如“GK”可以是某个特定领域的缩写)。由于资源是压缩包(.rar格式),这通常意味着文件可能包含了多种类型的资料,例如文档、代码、图片等。 描述: 描述中提到了“最大最小搜索”(Minimax Algorithm),这是一个在计算机科学中常见的算法,尤其是在人工智能领域,用于游戏树的决策过程中。该算法旨在最小化一个假想的对手可能的最大利益。描述中的核心问题在于搜索深度的增加导致可能的搜索位置数呈指数级增长,这在计算机国际象棋程序中尤其明显。描述指出,如果每一步有平均十种走法,那么搜索深度为九步将需要搜索十亿个位置,这显然对计算资源的要求极高,而减少搜索结点数的简单方法是降低搜索深度。 从描述中可以提取出以下IT知识点: 1. 最大最小搜索(Minimax Algorithm):这是一种决策规则,用于在零和游戏中(例如国际象棋)预测对手的移动,选择最优的一步。该算法会遍历所有可能的游戏树,评估每一种可能的移动,以确保最坏情况下的最优结果。 2. 搜索深度(Search Depth):在最大最小搜索算法中,搜索深度是指算法在游戏树中向前看几步的能力。理论上,搜索深度越深,找到最优解的可能性越大,但同时计算复杂度呈指数级增长。 3. 指数级增长(Exponential Growth):描述中提到的“十亿个位置”是搜索深度为九时的计算结果,显示了搜索位置数是如何随着每一步走法的增加而呈指数级增长的。在计算机科学中,对于需要遍历大量可能性的问题,这是常见的性能瓶颈。 4. 计算资源限制(Computational Constraints):由于计算能力是有限的,计算机程序在设计时必须考虑到性能与资源限制,尤其是对于实时响应要求较高的应用,如游戏AI。 5. 搜索结点减少方法(Reducing Search Nodes):描述提出了减少搜索结点数以降低计算资源需求的简单方法——减少搜索深度。然而,这可能会牺牲决策的质量。因此,实际中可能会采用启发式评估、Alpha-Beta剪枝等技术来平衡搜索深度与计算效率。 标签: "10-mt-94_gk" 可能指代了与特定问题集相关的资料或问题编号。这些标签通常用于标记和分类内容,便于检索和引用。 压缩包子文件的文件名称列表: "加法器" 和 "***.txt"。加法器可能是指某种实现加法功能的硬件或软件模块。"***.txt" 可能是一个文本文件,包含了网址***的相关信息。PUDN是一个提供各类编程资源下载的网站,其中可能包含源代码、软件、图书等资源。 综合以上信息,我们了解到该资源涉及计算机国际象棋程序设计中使用到的最大最小搜索算法,及其在搜索深度与性能间的权衡。同时也暗示了技术资源下载网站PUDN,可能提供了与之相关的学习和开发资源。

/var/folders/gk/ryl0f4y10m9ccnhw_1vlpjzh0000gn/T/ipykernel_41405/1920266051.py:2: SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame. Try using .loc[row_indexer,col_indexer] = value instead See the caveats in the documentation: https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy device_df['cluster_label'] = db.labels_ /var/folders/gk/ryl0f4y10m9ccnhw_1vlpjzh0000gn/T/ipykernel_41405/1920266051.py:8: SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame. Try using .loc[row_indexer,col_indexer] = value instead See the caveats in the documentation: https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy device_df['hour'] = device_df['timestamp'].map(lambda x: time.localtime(x).tm_hour) /var/folders/gk/ryl0f4y10m9ccnhw_1vlpjzh0000gn/T/ipykernel_41405/1920266051.py:9: SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame. Try using .loc[row_indexer,col_indexer] = value instead See the caveats in the documentation: https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy device_df['is_night'] = device_df['hour'].map(lambda x: 1 if x >= 22 or x < 6 else 0) /var/folders/gk/ryl0f4y10m9ccnhw_1vlpjzh0000gn/T/ipykernel_41405/1920266051.py:10: SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame. Try using .loc[row_indexer,col_indexer] = value instead See the caveats in the documentation: https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy device_df['is_daytime'] = device_df['hour'].map(lambda x: 1 if x >= 10 or x < 17 else 0) /var/folders/gk/ryl0f4y10m9ccnhw_1vlpjzh0000gn/T/ipykernel_41405/1920266051.py:11: SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame. Try using .loc[row_indexer,col_indexer] = value instead See the caveats in the documentation: https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy device_df['is_weekend'] = device_df['timestamp'].map(lambda x: 1 if datetime.datetime.utcfromtimestamp(x).weekday() >= 5 else 0) /var/folders/gk/ryl0f4y10m9ccnhw_1vlpjzh0000gn/T/ipykernel_41405/1920266051.py:18: UserWarning: Boolean Series key will be reindexed to match DataFrame index. night_cnt = device_cluster_df[device_df['is_night'] == 1]['event_day'].drop_duplicates().count() /var/folders/gk/ryl0f4y10m9ccnhw_1vlpjzh0000gn/T/ipykernel_41405/1920266051.py:19: UserWarning: Boolean Series key will be reindexed to match DataFrame index. daytime_cnt = device_cluster_df[device_df['is_daytime'] == 1]['event_day'].drop_duplicates().count() /var/folders/gk/ryl0f4y10m9ccnhw_1vlpjzh0000gn/T/ipykernel_41405/1920266051.py:20: UserWarning: Boolean Series key will be reindexed to match DataFrame index. weekend_cnt = device_cluster_df[device_df['is_weekend'] == 1]['event_day'].drop_duplicates().count() /var/folders/gk/ryl0f4y10m9ccnhw_1vlpjzh0000gn/T/ipykernel_41405/1920266051.py:21: UserWarning: Boolean Series key will be reindexed to match DataFrame index. weekday_cnt = device_cluster_df[device_df['is_weekend'] == 0]['event_day'].drop_duplicates().count() ​解释一下这段信息为什么出现

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/var/folders/gk/ryl0f4y10m9ccnhw_1vlpjzh0000gn/T/ipykernel_35021/1920266051.py:2: SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame. Try using .loc[row_indexer,col_indexer] = value instead See the caveats in the documentation: https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy device_df['cluster_label'] = db.labels_ /var/folders/gk/ryl0f4y10m9ccnhw_1vlpjzh0000gn/T/ipykernel_35021/1920266051.py:8: SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame. Try using .loc[row_indexer,col_indexer] = value instead See the caveats in the documentation: https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy device_df['hour'] = device_df['timestamp'].map(lambda x: time.localtime(x).tm_hour) /var/folders/gk/ryl0f4y10m9ccnhw_1vlpjzh0000gn/T/ipykernel_35021/1920266051.py:9: SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame. Try using .loc[row_indexer,col_indexer] = value instead See the caveats in the documentation: https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy device_df['is_night'] = device_df['hour'].map(lambda x: 1 if x >= 22 or x < 6 else 0) /var/folders/gk/ryl0f4y10m9ccnhw_1vlpjzh0000gn/T/ipykernel_35021/1920266051.py:10: SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame. Try using .loc[row_indexer,col_indexer] = value instead See the caveats in the documentation: https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy device_df['is_daytime'] = device_df['hour'].map(lambda x: 1 if x >= 10 or x < 17 else 0) /var/folders/gk/ryl0f4y10m9ccnhw_1vlpjzh0000gn/T/ipykernel_35021/1920266051.py:11: SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame. Try using .loc[row_indexer,col_indexer] = value instead See the caveats in the documentation: https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy device_df['is_weekend'] = device_df['timestamp'].map(lambda x: 1 if datetime.datetime.utcfromtimestamp(x).weekday() >= 5 else 0) /var/folders/gk/ryl0f4y10m9ccnhw_1vlpjzh0000gn/T/ipykernel_35021/1920266051.py:18: UserWarning: Boolean Series key will be reindexed to match DataFrame index. night_cnt = device_cluster_df[device_df['is_night'] == 1]['event_day'].drop_duplicates().count() /var/folders/gk/ryl0f4y10m9ccnhw_1vlpjzh0000gn/T/ipykernel_35021/1920266051.py:19: UserWarning: Boolean Series key will be reindexed to match DataFrame index. daytime_cnt = device_cluster_df[device_df['is_daytime'] == 1]['event_day'].drop_duplicates().count() /var/folders/gk/ryl0f4y10m9ccnhw_1vlpjzh0000gn/T/ipykernel_35021/1920266051.py:20: UserWarning: Boolean Series key will be reindexed to match DataFrame index. weekend_cnt = device_cluster_df[device_df['is_weekend'] == 1]['event_day'].drop_duplicates().count() /var/folders/gk/ryl0f4y10m9ccnhw_1vlpjzh0000gn/T/ipykernel_35021/1920266051.py:21: UserWarning: Boolean Series key will be reindexed to match DataFrame index. weekday_cnt = device_cluster_df[device_df['is_weekend'] == 0]['event_day'].drop_duplicates().count()jupyter notebook出现这段报错的原因

2023-07-12 上传