帮我改进这段代码，使其能够正常运行。from sklearn.metrics.pairwise import cosine_similarity # 1. 收集用户画像数据 user_profiles = { 'user1': {'age': 25, 'gender': 'male', 'interests': ['music', 'sports'], 'history': ['item1', 'item2', 'item3']}, 'user2': {'age': 30, 'gender': 'female', 'interests': ['reading', 'travel'], 'history': ['item2', 'item5', 'item6']}, 'user3': {'age': 22, 'gender': 'male', 'interests': ['sports', 'movies'], 'history': ['item3', 'item4', 'item5']} } # 2. 构建用户-项目矩阵 user_item_matrix = { 'user1': [1, 1, 1, 0, 0, 0], 'user2': [0, 1, 0, 0, 1, 1], 'user3': [0, 0, 1, 1, 1, 0] } # 3. 计算用户之间的相似度 similarity_matrix = cosine_similarity(user_item_matrix) # 4. 找到与目标用户最相似的K个用户 target_user = 'user1' k = 3 similar_users = sorted([(idx, sim) for idx, sim in enumerate(similarity_matrix[user_profiles.keys().index(target_user)]) if idx != user_profiles.keys().index(target_user)], key=lambda x: x[1], reverse=True)[:k] similar_user_indices = [x[0] for x in similar_users] # 5. 推荐给目标用户可能感兴趣的项目 recommended_items = set() for idx in similar_user_indices: recommended_items.update(set(user_profiles[list(user_profiles.keys())[idx]]['history'])) recommended_items -= set(user_profiles[target_user]['history'])

from sklearn.metrics.pairwise import cosine_similarity ModuleNotFoundError: No module named 'sklearn'

根据提供的引用内容，这段代码出现了一个ModuleNotFoundError，意味着sklearn模块没有被正确导入。sklearn是一个常用的Python机器学习库，需要先安装才能使用。可以通过在命令行中输入“pip install scikit-learn”...

pycharm报错 unsolved reference，from sklearn.metrics.pairwise import cosine_similarity报错

这个错误通常是因为PyCharm无法找到您引用的库或包。在这种情况下，您可以尝试以下解决方法： 1. 确保您已经安装了所需的库或包，可以在终端中使用pip install命令来安装，例如：pip install scikit-learn。 2. ...

data = ["This two-wheeler is really good on slippery roads"] sentce=["This is really good"] from sklearn.feature_extraction.text import CountVectorizer from sklearn.feature_extraction.text import TfidfTransformer from sklearn.metrics.pairwise import cosine_similarity vectorizer = CountVectorizer() X_train_termcounts = vectorizer.fit_transform(data) tfidf_transformer = TfidfTransformer() X_train_tfidf = tfidf_transformer.fit_transform(X_train_termcounts) print ("\nTfidf of training data:", X_train_tfidf.toarray()) X_input_termcounts = vectorizer.transform(sentce) X_input_tfidf = tfidf_transformer.transform(X_input_termcounts) print ("\nTfidf of training data:", X_input_tfidf.toarray()) print("\nCosine of data:",cosine_similarity(X_train_tfidf,X_input_tfidf))代码注释

from sklearn.metrics.pairwise import cosine_similarity # 导入余弦相似度计算库 vectorizer = CountVectorizer() # 创建词袋模型 X_train_termcounts = vectorizer.fit_transform(data) # 对训练数据进行特征...

import pandas as pdfrom sklearn.feature_extraction.text import TfidfVectorizerfrom sklearn.metrics.pairwise import cosine_similarity# 读取数据集并进行数据清洗df = pd.read_csv('douban_books_top250.csv', encoding='utf-8')df = df[['title', 'author', 'publisher', 'tags', 'summary']]df = df.dropna()df = df.reset_index(drop=True)# 对每本图书的关键信息进行向量化处理vectorizer = TfidfVectorizer(stop_words='english')tfidf = vectorizer.fit_transform(df['tags'] + ' ' + df['summary'])# 根据用户的偏好和图书的相似度进行推荐def recommend_books(user_input, n): user_input_vec = vectorizer.transform([user_input]) similarities = cosine_similarity(user_input_vec, tfidf).flatten() indices = similarities.argsort()[::-1][:n] recommendations = df.loc[indices] return recommendations分析这段代码

1. 首先，代码读取了一个名为'douban_books_top250.csv'的数据集，并选择了数据集中的'title', 'author', 'publisher', 'tags', 'summary'这些关键信息，并进行了数据清洗（删除了缺失值）。 2. 接着，通过使用...

import pandas as pd from numpy import * food=pd.read_csv('hot-spicy pot.csv') food.head(10) food['taste'].head(5) import pandas as pd from numpy import * from sklearn.feature_extraction.text import TfidfVectorizer #1.读取数据 print('Step1:read data...') food=pd.read_csv('hot-spicy pot.csv') food.head(10) #2.将菜品的描述构造成TF-IDF向量 print('Step2:make TF-IDF...') tfidf=TfidfVectorizer(stop_words='english') tfidf_matrix=tfidf.fit_transform(food['taste']) tfidf_matrix.shape #3.计算两个菜品的余弦相似度 print('Step3:compute similarity...') from sklearn.metrics.pairwise import pairwise_distances cosine_sim=pairwise_distances(tfidf_matrix,metric="cosine") #推荐函数，输出与其最相似的10个菜品 def content_based_recommendation(name,consine_sim=cosine_sim): idx=indices[name] sim_scores=list(enumerate(cosine_sim[idx])) sim_scores=sorted(sim_scores,key=lambda x:x[1]) sim_scores=sim_scores[1:11] food_indices=[i[0]for i in sim_scores] return food['name'].iloc[food_indices] #4.根据菜名及特点进行推荐 print('Step4:recommend by name...') #建立索引，方便使用菜名进行数据访问 indices=pd.Series(food.index,index=food['name']).drop_duplicates() result=content_based_recommendation("celery") result from sklearn.metrics.pairwise import pairwise_distances cosine_sim=pairwise_distances(tfidf_matrix,metric="cosine") tfidf_matrix.shape 请用中文逐行详细注释，这段代码

这段代码主要是针对热辣火锅这个菜品数据集，进行基于内容的推荐。 1. 导入所需的库 python import pandas as pd from numpy import * from sklearn.feature_extraction.text import TfidfVectorizer 2...

import numpy as np import pandas as pd from sklearn.metrics.pairwise import cosine_similarity # 创建一个DataFrame df = pd.DataFrame({'a': [10, 20, np.nan, 30, 20, 40], 'b': [50, 60, 70, np.nan, 80, np.nan], 'c': [90, np.nan, 110, 120, 130, 140]}) # 计算相似度矩阵 similarity_matrix = cosine_similarity(df.T.notnull().astype(int)) # 遍历DataFrame中每个缺失值并进行填充 for col in df: for i, value in enumerate(df[col]): if pd.isna(value): # 找到在同一列上与当前值最相似的行 similarity_scores = similarity_matrix[i] closest_match_index = np.nanargmax(similarity_scores) closest_match_value = df.iloc[closest_match_index][col] df.at[i, col] = closest_match_value print(df)

这段代码是用于填充DataFrame中的缺失值。具体来说，它首先计算每一列的相似度矩阵，然后遍历每一个缺失值，...需要注意的是，这段代码使用了numpy、pandas和sklearn库，其中cosine_similarity函数用于计算相似度矩阵。

import pandas as pd import numpy as np from sklearn.feature_extraction.text import TfidfVectorizer from sklearn.metrics.pairwise import cosine_similarity # 读取Excel文件 data = pd.read_excel('工作簿1.xlsx') # 选择项目的特征列 feature_columns = ['城市', '职业', '幸运色'] # 选择适当的列作为项目的特征 # 将特征列合并为一个文本列 data['combined_features'] = data[feature_columns].apply(lambda x: ' '.join(x.dropna().astype(str)), axis=1) # 创建TF-IDF向量化器 vectorizer = TfidfVectorizer() # 对合并的文本列进行向量化 item_features = vectorizer.fit_transform(data['combined_features']) # 计算项目之间的相似度 similarity_matrix = cosine_similarity(item_features) # print(similarity_matrix.shape) # 为用户推荐项目 user_id = 1 # 假设用户ID为1 user_ratings = data[data['user_id'] == user_id]['rating'] user_ratings = user_ratings.reset_index(drop=True) # 计算用户对项目的评分预测 user_ratings = user_ratings.values.reshape(-1, 1) # 输出推荐的项目 recommended_items = pd.Series(user_ratings[:len(data)], index=data['幸运色']).sort_values(ascending=False) print(recommended_items.head(10))

它使用了pandas库来读取Excel文件，numpy库用于数值计算，sklearn库中的TfidfVectorizer类用于将文本向量化，cosine_similarity函数用于计算项目之间的相似度。首先，代码从Excel文件中读取数据，并选择了一些特征...

改写这段编码：cosine_similarities = cosine_similarity(df) print(cosine_similarities) from sklearn.cluster import KMeans kms = KMeans(n_clusters=10, random_state=123) k_data = kms.fit_predict(cosine_similarities) # 对余弦相似度的计算结果进行聚类分群 print(k_data) print(k_data == 3) print(words[0:3]) words_ary = np.array(words) print(words_ary[0:3])

from sklearn.metrics.pairwise import cosine_similarity cosine_similarities = cosine_similarity(df) print(cosine_similarities) # 对余弦相似度的计算结果进行聚类分群 from sklearn.cluster import KMeans ...

解释下列代码 import numpy as np import pandas as pd #数据文件格式用户id、商品id、评分、时间戳 header = ['user_id', 'item_id', 'rating', 'timestamp'] with open( "u.data", "r") as file_object: df=pd.read_csv(file_object,sep='\t',names=header) #读取u.data文件 print(df) n_users = df.user_id.unique().shape[0] n_items = df.item_id.unique().shape[0] print('Mumber of users = ' + str(n_users) + ' | Number of movies =' + str(n_items)) from sklearn.model_selection import train_test_split train_data, test_data = train_test_split(df, test_size=0.2, random_state=21) train_data_matrix = np.zeros((n_users, n_items)) for line in train_data.itertuples(): train_data_matrix[line[1] - 1, line[2] -1] = line[3] test_data_matrix = np.zeros((n_users, n_items)) for line in test_data.itertuples(): test_data_matrix[line[1] - 1, line[2] - 1] = line[3] print(train_data_matrix.shape) print(test_data_matrix.shape) from sklearn.metrics.pairwise import cosine_similarity #计算用户相似度 user_similarity = cosine_similarity(train_data_matrix) print(u"用户相似度矩阵: ", user_similarity.shape) print(u"用户相似度矩阵: ", user_similarity) def predict(ratings, similarity, type): # 基于用户相似度矩阵的 if type == 'user': mean_user_ratings = ratings.mean(axis=1) ratings_diff = (ratings - mean_user_ratings[:, np.newaxis] ) pred =mean_user_ratings[:, np.newaxis] + np.dot(similarity, ratings_diff)/ np.array( [np.abs(similarity).sum(axis=1)]).T print(u"预测值: ", pred.shape) return pred user_prediction = predict(train_data_matrix, user_similarity, type='user') print(user_prediction) from sklearn.metrics import mean_squared_error from math import sqrt def rmse(prediction, ground_truth): prediction = prediction[ground_truth.nonzero()].flatten() ground_truth = ground_truth[ground_truth.nonzero()].flatten() return sqrt(mean_squared_error(prediction, ground_truth)) print('User-based CF RMSE: ' + str(rmse(user_prediction, test_data_matrix)))

解释下列代码# -- coding: gbk-- import numpy as np import pandas as pd header = ['user_id', 'item_id', 'rating', 'timestamp'] with open("u.data", "r") as file_object: df = pd.read_csv(file_object, sep='\t', names=header) print(df) n_users = df.user_id.unique().shape[0] n_items = df.item_id.unique().shape[0] print('Number of users = ' + str(n_users) + ' | Number of movies =' + str(n_items)) from sklearn.model_selection import train_test_split train_data, test_data = train_test_split(df, test_size=0.2, random_state=21) train_data_matrix = np.zeros((n_users, n_items)) for line in train_data.itertuples(): train_data_matrix[line[1] - 1, line[2] -1] = line[3] test_data_matrix = np.zeros((n_users, n_items)) for line in test_data.itertuples(): test_data_matrix[line[1] - 1, line[2] - 1] = line[3] print(train_data_matrix.shape) print(test_data_matrix.shape) from sklearn.metrics.pairwise import cosine_similarity item_similarity = cosine_similarity(train_data_matrix.T) print(u" 物品相似度矩阵：", item_similarity.shape) print(u"物品相似度矩阵: ", item_similarity) def predict(ratings, similarity, type): # 基于物品相似度矩阵的 if type == 'item': pred = ratings.dot(similarity) / np.array([np.abs(similarity).sum(axis=1)]) print(u"预测值: ", pred.shape) return pred # 预测结果 item_prediction = predict(train_data_matrix, item_similarity, type='item') print(item_prediction) from sklearn.metrics import mean_squared_error from math import sqrt def rmse(prediction, ground_truth): prediction = prediction[ground_truth.nonzero()].flatten() ground_truth = ground_truth[ground_truth.nonzero()].flatten() return sqrt(mean_squared_error(prediction, ground_truth)) item_prediction = np.nan_to_num(item_prediction) print('Item-based CF RMSE: ' + str(rmse(item_prediction, test_data_matrix)))

这段代码主要是实现了基于物品相似度矩阵的推荐系统，具体流程如下： 1. 读取 u.data 数据集文件，用 pandas 库将其转换成 DataFrame 格式，并输出该数据集； 2. 计算该数据集中有多少个用户和多少个物品； 3. 将...

import pandas as pd import numpy as np from sklearn.feature_extraction.text import TfidfVectorizer from sklearn.metrics.pairwise import cosine_similarity data = pd.read_excel('工作簿1.xlsx') feature_columns = ['城市', '职业', '幸运色'] # 选择适当的列作为项目的特征 data['combined_features'] = data[feature_columns].apply(lambda x: ' '.join(x.dropna().astype(str)), axis=1) vectorizer = TfidfVectorizer() item_features = vectorizer.fit_transform(data['combined_features']) similarity_matrix = cosine_similarity(item_features) user_id = 1 # 假设用户ID为1 user_ratings = data[data['user_id'] == user_id]['rating'] user_ratings = user_ratings.reset_index(drop=True) user_ratings = user_ratings.values.reshape(-1, 1) recommended_items = pd.Series(user_ratings[:len(data)], index=data['幸运色']).sort_values(ascending=False) print(recommended_items.head(10)) 报错ValueError: Length of values (1) does not match length of index (1000) 如何进行修改

这个错误是由于用户评分数据的长度与数据集的长度不匹配导致的。根据代码的逻辑，代码尝试使用用户的评分数据来预测用户对所有项目的评分，并输出推荐的项目列表。根据错误信息提示，用户评分数据的长度为1，而...

from transformers import BertTokenizer, BertModel import torch from sklearn.metrics.pairwise import cosine_similarity # 加载BERT模型和分词器 tokenizer = BertTokenizer.from_pretrained('bert-base-chinese') model = BertModel.from_pretrained('bert-base-chinese') # 种子词列表 seed_words = ['个人信息', '隐私', '泄露', '安全'] # 加载微博用户文本语料（假设存储在weibo1.txt文件中） with open('output/weibo1.txt', 'r', encoding='utf-8') as f: corpus = f.readlines() # 预处理文本语料，获取每个中文词汇的词向量 corpus_vectors = [] for text in corpus: # 使用BERT分词器将文本分成词汇 tokens = tokenizer.tokenize(text) # 将词汇转换为对应的id input_ids = tokenizer.convert_tokens_to_ids(tokens) # 将id序列转换为PyTorch张量 input_ids = torch.tensor(input_ids).unsqueeze(0) # 使用BERT模型计算词向量 with torch.no_grad(): outputs = model(input_ids) last_hidden_state = outputs[0][:, 1:-1, :] avg_pooling = torch.mean(last_hidden_state, dim=1) corpus_vectors.append(avg_pooling.numpy()) # 计算每个中文词汇与种子词的余弦相似度 similarity_threshold = 0.8 privacy_words = set() for seed_word in seed_words: # 将种子词转换为对应的id seed_word_ids = tokenizer.convert_tokens_to_ids(tokenizer.tokenize(seed_word)) # 将id序列转换为PyTorch张量，并增加batch size维度 seed_word_ids = torch.tensor(seed_word_ids).unsqueeze(0) # 使用BERT模型计算种子词的词向量 with torch.no_grad(): outputs = model(seed_word_ids) last_hidden_state = outputs[0][:, 1:-1, :] avg_pooling = torch.mean(last_hidden_state, dim=1) seed_word_vector = avg_pooling.numpy() # 计算每个中文词汇与种子词的余弦相似度 for i, vector in enumerate(corpus_vectors): sim = cosine_similarity([seed_word_vector], [vector])[0][0] if sim >= similarity_threshold: privacy_words.add(corpus[i]) print(privacy_words) 上述代码运行后报错了，报错信息：ValueError: Found array with dim 3. check_pairwise_arrays expected <= 2. 怎么修改？

from sklearn.metrics.pairwise import cosine_similarity # 加载BERT模型和分词器 tokenizer = BertTokenizer.from_pretrained('bert-base-chinese') model = BertModel.from_pretrained('bert-base-chinese') # ...

3. 已知有五篇文档，存放在trian中，train = ["Hello world","Hello python Hello","world python Hello","Hello Hello java" ,"Hello linux shell"] 要求 a) 将文档向量化（利用tf-idf），并给出向量化的矩阵的维度。先用公式推导计算出来再用程序验证 b) 调用from sklearn.metrics.pairwise import pairwise_distances计算五篇文档之间的相似度，并给出相似度矩阵的维度

from sklearn.metrics.pairwise import pairwise_distances train = ["Hello world", "Hello python Hello", "world python Hello", "Hello Hello java", "Hello linux shell"] vectorizer = TfidfVectorizer() ...

余弦相似算法_余弦相似_textsimilarity_

在Python中，实现余弦相似度可以使用sklearn.metrics.pairwise.cosine_similarity库，或者自定义函数如cos.py文件可能实现的那样。自定义实现通常涉及计算向量点乘和模长，例如： python import numpy as np...

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