import pandas as pd from sklearn.feature_extraction.text import TfidfVectorizer from sklearn.model_selection import train_test_split from sklearn.naive_bayes import MultinomialNB # 加载 CSV 文件 train_df = pd.read_csv('train.csv', encoding='utf-8', error_bad_lines=False) test_df = pd.read_csv('test.csv', encoding='utf-8', error_bad_lines=False) # 删除无效行 train_df.dropna(inplace=True) test_df.dropna(inplace=True) # 划分训练集和测试集 X_train = train_df['content'] y_train = train_df['category'] X_test = test_df['content'] y_test = test_df['category'] # 特征提取 vectorizer = TfidfVectorizer() X_train = vectorizer.fit_transform(X_train) X_test = vectorizer.transform(X_test) # 训练模型 model = MultinomialNB() model.fit(X_train, y_train) # 测试模型 score = model.score(X_test, y_test) print('Accuracy:', score)修改以上代码，使其使用error_bad_lines=False

python中时间转换datetime和pd.to_datetime详析

import pandas as pd date = pd.to_datetime('2022-03-01') （2）将字符串或Unicode转化为时间格式： pd.to_datetime(date_string, format=format) 同样，pd.to_datetime 可以解析字符串，特别是当数据集中...

ModuleNotFoundError: No module named ‘sklearn.cross_validation’

from sklearn.model_selection import train_test_split 就可以成功 # 1. Importing the libraries import numpy as np import pandas as pd # 2. Importing dataset dataset = pd.read_csv('Data.csv') # read csv...

能否优化以下程序，使用test.csv和train.csv,程序如下:import pandas as pd from sklearn.feature_extraction.text import TfidfVectorizer from sklearn.model_selection import train_test_split from sklearn.naive_bayes import MultinomialNB # 加载 CSV 文件 df = pd.read_csv('news.csv', encoding='utf-8', error_bad_lines=False) # 删除无效行 df.dropna(inplace=True) # 划分训练集和测试集 X_train, X_test, y_train, y_test = train_test_split(df['content'], df['category'], test_size=0.2) # 特征提取 vectorizer = TfidfVectorizer() X_train = vectorizer.fit_transform(X_train) X_test = vectorizer.transform(X_test) # 训练模型 model = MultinomialNB() model.fit(X_train, y_train) # 测试模型 score = model.score(X_test, y_test) print('Accuracy:', score)

from sklearn.model_selection import train_test_split from sklearn.naive_bayes import MultinomialNB # 加载 CSV 文件 train_df = pd.read_csv('train.csv', encoding='utf-8', error_bad_lines=False) test_df...

优化import pandas as pd from sklearn.feature_extraction.text import TfidfVectorizer from sklearn.model_selection import train_test_split from sklearn.naive_bayes import MultinomialNB #加载 CSV 文件并忽略错误行 try: train_df = pd.read_csv('train.csv', encoding='utf-8') except: pass try: test_df = pd.read_csv('test.csv', encoding='utf-8') except: pass #删除无效行 train_df.dropna(inplace=True) test_df.dropna(inplace=True) #划分训练集和测试集 X_train = train_df['content'] y_train = train_df['category'] X_test = test_df['content'] y_test = test_df #特征提取 vectorizer = TfidfVectorizer() X_train = vectorizer.fit_transform(X_train) X_test = vectorizer.transform(X_test) #训练模型 model = MultinomialNB() model.fit(X_train, y_train) #测试模型 score = model.score(X_test, y_test) print('Accuracy:', score)

from sklearn.model_selection import train_test_split from sklearn.naive_bayes import MultinomialNB # 加载 CSV 文件并忽略错误行 with open('train.csv', 'r', encoding='utf-8') as f: reader = csv....

import pandas as pd from sklearn.feature_extraction.text import TfidfVectorizer from sklearn.model_selection import train_test_split from sklearn.naive_bayes import MultinomialNB 加载 CSV 文件 train_df = pd.read_csv('train.csv', encoding='utf-8', error_bad_lines=False) test_df = pd.read_csv('test.csv', encoding='utf-8', error_bad_lines=None) # 替换参数 error_bad_lines 删除无效行 train_df.dropna(inplace=True) test_df.dropna(inplace=True) 划分训练集和测试集 X_train = train_df['content'] y_train = train_df['category'] X_test = test_df['content'] y_test = test_df 特征提取 vectorizer = TfidfVectorizer() X_train = vectorizer.fit_transform(X_train) X_test = vectorizer.transform(X_test) 训练模型 model = MultinomialNB() model.fit(X_train, y_train) 测试模型 score = model.score(X_test, y_test) print('Accuracy:', score)，优化以上代码

以下是一些可以优化以上代码的建议： 1. 在特征提取的过程中，可以考虑对文本进行预处理，比如去除停用词、进行词干化等操作，提高特征的准确性。 2. 在训练模型之前，可以对数据进行平衡处理，避免类别不平衡导致...

import pandas as pd from sklearn.feature_extraction.text import TfidfVectorizer from sklearn.naive_bayes import GaussianNB from sklearn.model_selection import train_test_split from sklearn.feature_extraction.text import TfidfVectorizer # df1是经过预处理后的数据集，包含content_clean和category两列 X = df1['content_clean'] y = df1['category'] # 将数据集划分为训练集和测试集 train_X, test_X, train_y, test_y = train_test_split(X, y, test_size=0.2,) # 向量化文本 vectorizer = TfidfVectorizer() train_vectors = vectorizer.fit_transform(train_X) test_vectors = vectorizer.transform(test_X) # X_dense = X.toarray() classifier=GaussianNB().fit(train_vectors, train_labels)

from sklearn.model_selection import train_test_split # df1是经过预处理后的数据集，包含content_clean和category两列 X = df1['content_clean'] y = df1['category'] # 将数据集划分为训练集和测试集 ...

能否优化以下程序import pandas as pd from sklearn.model_selection import train_test_split from sklearn.feature_extraction.text import CountVectorizer from sklearn.naive_bayes import MultinomialNB # 读取数据集 df = pd.read_csv('news_dataset.csv', error_bad_lines=False) # 划分数据集 X_train, X_test, y_train, y_test = train_test_split(df['text'], df['label'], test_size=0.2) # 将文本转换为数字向量 vectorizer = CountVectorizer() X_train_vec = vectorizer.fit_transform(X_train) X_test_vec = vectorizer.transform(X_test) # 训练朴素贝叶斯分类器 classifier = MultinomialNB() classifier.fit(X_train_vec, y_train) # 预测测试集 y_pred = classifier.predict(X_test_vec) # 计算准确率 accuracy = (y_pred == y_test).sum() / y_test.shape[0] print(f'Accuracy: {accuracy}')

from sklearn.model_selection import train_test_split from sklearn.feature_extraction.text import TfidfVectorizer from sklearn.naive_bayes import MultinomialNB # 读取数据集，指定数据类型 df = pd.read...

修改代码，使用skiprows参数，跳过包含错误行的行：import pandas as pdfrom sklearn.feature_extraction.text import TfidfVectorizerfrom sklearn.model_selection import train_test_splitfrom sklearn.naive_bayes import MultinomialNB# 加载 CSV 文件train_df = pd.read_csv('train.csv', encoding='utf-8', error_bad_lines=False)test_df = pd.read_csv('test.csv', encoding='utf-8', error_bad_lines=False)# 删除无效行train_df.dropna(inplace=True)test_df.dropna(inplace=True)# 划分训练集和测试集X_train = train_df['content']y_train = train_df['category']X_test = test_df['content']y_test = test_df['category']# 特征提取vectorizer = TfidfVectorizer()X_train = vectorizer.fit_transform(X_train)X_test = vectorizer.transform(X_test)# 训练模型model = MultinomialNB()model.fit(X_train, y_train)# 测试模型score = model.score(X_test, y_test)print('Accuracy:', score)

from sklearn.feature_extraction.text import TfidfVectorizer from sklearn.model_selection import train_test_split from sklearn.naive_bayes import MultinomialNB # 加载 CSV 文件，跳过错误行 train_df = ...

帮我优化下面程序import pandas as pd from sklearn.feature_extraction.text import CountVectorizer from sklearn.naive_bayes import MultinomialNB # 读取训练数据集 train_df = pd.read_csv('train.csv') # 读取测试数据集 test_df = pd.read_csv('test.csv') # 将文本数据转换成向量形式 vectorizer = CountVectorizer() train_vectors = vectorizer.fit_transform(train_df['text']) test_vectors = vectorizer.transform(test_df['text']) # 使用朴素贝叶斯分类器进行分类 classifier = MultinomialNB() classifier.fit(train_vectors, train_df['label']) # 对测试数据集进行预测 predictions = classifier.predict(test_vectors) # 输出预测结果 for i, prediction in enumerate(predictions): print(f"Prediction for news {i+1}: {prediction}")，让它复杂点

from sklearn.feature_extraction.text import TfidfVectorizer from sklearn.naive_bayes import MultinomialNB from sklearn.ensemble import VotingClassifier from sklearn.pipeline import Pipeline from ...

使用了 Anaconda 管理 Python 环境，如何运行import pandas as pd import numpy as np from sklearn.feature_extraction.text import TfidfVectorizer from sklearn.naive_bayes import MultinomialNB from sklearn.metrics import accuracy_score from sklearn.model_selection import train_test_split filename = 'D:/111/20news-18828.tar/20newsgroups.srv' with open(filename, 'r', encoding='UTF-8') as file: A = file.readlines() data = [] for line in A: category, text = line.split('\t') data.append((category, text)) df = pd.DataFrame(data, columns=['category', 'text']) # 分割数据集为训练集和测试集 X_train, X_test, y_train, y_test = train_test_split(df['text'], df['category'], random_state=42) # 对文本进行特征提取 tfidf = TfidfVectorizer(stop_words='english') X_train_tfidf = tfidf.fit_transform(X_train.astype(str)) X_test_tfidf = tfidf.transform(X_test.astype(str)) # 使用多项式朴素贝叶斯模型进行训练和预测 clf = MultinomialNB() clf.fit(X_train_tfidf, y_train) y_pred = clf.predict(X_test_tfidf) # 输出模型的准确率 print('Accuracy:', accuracy_score(y_test, y_pred))

可以在 Anaconda Prompt 或者终端中打开 Python 解释器，然后将代码复制粘贴进去并运行。具体步骤如下： 1. 打开 Anaconda Prompt 或者终端。 2. 输入 python 命令进入 Python 解释器。 3. 将代码复制粘贴进去，...

Visual Studio Code能否import pandas as pdimport numpy as npfrom sklearn.feature_extraction.text import TfidfVectorizerfrom sklearn.naive_bayes import MultinomialNBfrom sklearn.metrics import accuracy_scorefrom sklearn.model_selection import train_test_splitfilename = 'D:/111/20news-18828.tar/20newsgroups.srv'with open(filename, 'r', encoding='UTF-8') as file: A = file.readlines()data = []for line in A: category, text = line.split('\t') data.append((category, text))df = pd.DataFrame(data, columns=['category', 'text'])# 分割数据集为训练集和测试集X_train, X_test, y_train, y_test = train_test_split(df['text'], df['category'], random_state=42)# 对文本进行特征提取tfidf = TfidfVectorizer(stop_words='english')X_train_tfidf = tfidf.fit_transform(X_train.astype(str))X_test_tfidf = tfidf.transform(X_test.astype(str))# 使用多项式朴素贝叶斯模型进行训练和预测clf = MultinomialNB()clf.fit(X_train_tfidf, y_train)y_pred = clf.predict(X_test_tfidf)# 输出模型的准确率print('Accuracy:', accuracy_score(y_test, y_pred))显示结果

Visual Studio Code可以import pandas as pd、import numpy as np、from sklearn.feature_extraction.text import TfidfVectorizer、from sklearn.naive_bayes import MultinomialNB、from sklearn.metrics import ...

import pandas as pd import numpy as np from csv import reader from sklearn.feature_extraction.text import TfidfVectorizer from sklearn.naive_bayes import MultinomialNB from sklearn.metrics import accuracy_score from sklearn.model_selection import train_test_split filename = 'D:/111/20news-18828.tar/20newsgroups.srv' with open(filename, 'rt', encoding='UTF-8') as file: A = file.readlines() data = np.array(A) df = pd.DataFrame(data, columns=['text']) # 分割数据集为训练集和测试集 X_train, X_test, y_train, y_test = train_test_split(df['text'], df['category'], random_state=42) # 对文本进行特征提取 tfidf = TfidfVectorizer(stop_words='english') X_train_tfidf = tfidf.fit_transform(X_train.astype(str)) X_test_tfidf = tfidf.transform(X_test.astype(str)) # 使用多项式朴素贝叶斯模型进行训练和预测 clf = MultinomialNB() clf.fit(X_train_tfidf, y_train) y_pred = clf.predict(X_test_tfidf.toarray()) # 输出模型的准确率 print('Accuracy:', accuracy_score(y_test, y_pred))是否有错误

from sklearn.model_selection import train_test_split filename = 'D:/111/20news-18828.tar/20newsgroups.srv' with open(filename, 'r', encoding='UTF-8') as file: A = file.readlines() data = np.array...

import pandas as pdimport numpy as npfrom sklearn.feature_extraction.text import TfidfVectorizerfrom sklearn.naive_bayes import MultinomialNBfrom sklearn.metrics import accuracy_scorefrom sklearn.model_selection import train_test_splitfilename = 'D:/111/20news-18828.tar/20newsgroups.srv'with open(filename, 'r', encoding='UTF-8') as file: A = file.readlines()data = []for line in A: category, text = line.split('\t') data.append((category, text))df = pd.DataFrame(data, columns=['category', 'text'])# 分割数据集为训练集和测试集X_train, X_test, y_train, y_test = train_test_split(df['text'], df['category'], random_state=42)# 对文本进行特征提取tfidf = TfidfVectorizer(stop_words='english')X_train_tfidf = tfidf.fit_transform(X_train.astype(str))X_test_tfidf = tfidf.transform(X_test.astype(str))# 使用多项式朴素贝叶斯模型进行训练和预测clf = MultinomialNB()clf.fit(X_train_tfidf, y_train)y_pred = clf.predict(X_test_tfidf)# 输出模型的准确率print('Accuracy:', accuracy_score(y_test, y_pred))在终端上指出“conda”无法显示结果

你可以在代码末尾添加以下代码：print('Accuracy:', accuracy_score(y_test, y_pred))，这样就可以在终端上看到模型的准确率了。另外，如果你使用的是Jupyter Notebook等交互式环境，可以直接运行代码块来查看输出...

import pandas as pdimport numpy as npfrom csv import readerfrom sklearn.feature_extraction.text import TfidfVectorizerfrom sklearn.naive_bayes import MultinomialNBfrom sklearn.metrics import accuracy_scorefrom sklearn.model_selection import train_test_splitfilename = input("请输入文件名：")with open(filename, 'rt', encoding='UTF-8') as file: A = file.readlines()data = np.array(A)df = pd.DataFrame(data, columns=['text'])# 分割数据集为训练集和测试集X_train, X_test, y_train, y_test = train_test_split(df['text'], df['category'], random_state=42)# 对文本进行特征提取tfidf = TfidfVectorizer(stop_words='english')X_train_tfidf = tfidf.fit_transform(X_train.astype(str))X_test_tfidf = tfidf.transform(X_test.astype(str))# 使用多项式朴素贝叶斯模型进行训练和预测clf = MultinomialNB()clf.fit(X_train_tfidf, y_train)y_pred = clf.predict(X_test_tfidf.toarray())# 输出模型的准确率print('Accuracy:', accuracy_score(y_test, y_pred))如何修改能导入我计算机上的文件

from sklearn.model_selection import train_test_split from tkinter import filedialog import tkinter as tk root = tk.Tk() root.withdraw() filename = filedialog.askopenfilename() with open(filename, '...

如何修改使得import pandas as pd import numpy as np from sklearn.feature_extraction.text import TfidfVectorizer from sklearn.naive_bayes import MultinomialNB from sklearn.metrics import accuracy_score from sklearn.model_selection import train_test_split filename = 'D:/111/20news-18828.tar/20newsgroups.srv' with open(filename, 'r', encoding='UTF-8') as file: A = file.readlines() data = np.array(A) df = pd.DataFrame(data, columns=['text'])df['category'] = df['text'].apply(lambda x: x.split('\t')[0]) df['text'] = df['text'].apply(lambda x: x.split('\t')[1]) # 分割数据集为训练集和测试集 X_train, X_test, y_train, y_test = train_test_split(df['text'], df['category'], random_state=42) # 对文本进行特征提取 tfidf = TfidfVectorizer(stop_words='english') X_train_tfidf = tfidf.fit_transform(X_train.astype(str)) X_test_tfidf = tfidf.transform(X_test.astype(str)) # 使用多项式朴素贝叶斯模型进行训练和预测 clf = MultinomialNB() clf.fit(X_train_tfidf, y_train) y_pred = clf.predict(X_test_tfidf) # 输出模型的准确率 print('Accuracy:', accuracy_score(y_test, y_pred))能够从我的文件中分类

from sklearn.model_selection import train_test_split filename = 'D:/111/20news-18828.tar/20newsgroups.srv' with open(filename, 'r', encoding='UTF-8') as file: A = file.readlines() data = [] for ...

import pandas as pd import matplotlib import numpy as np import matplotlib.pyplot as plt import jieba as jb import re from sklearn.feature_extraction.text import TfidfVectorizer from sklearn.feature_selection import chi2 import numpy as np from sklearn.model_selection import train_test_split from sklearn.feature_extraction.text import CountVectorizer from sklearn.feature_extraction.text import TfidfTransformer from sklearn.naive_bayes import MultinomialNB def sigmoid(x): return 1 / (1 + np.exp(-x)) import numpy as np #定义删除除字母,数字，汉字以外的所有符号的函数 def remove_punctuation(line): line = str(line) if line.strip()=='': return '' rule = re.compile(u"[^a-zA-Z0-9\u4E00-\u9FA5]") line = rule.sub('',line) return line def stopwordslist(filepath): stopwords = [line.strip() for line in open(filepath, 'r', encoding='utf-8').readlines()] return stopwords df = pd.read_csv('./online_shopping_10_cats/online_shopping_10_cats.csv') df=df[['cat','review']] df = df[pd.notnull(df['review'])] d = {'cat':df['cat'].value_counts().index, 'count': df['cat'].value_counts()} df_cat = pd.DataFrame(data=d).reset_index(drop=True) df['cat_id'] = df['cat'].factorize()[0] cat_id_df = df[['cat', 'cat_id']].drop_duplicates().sort_values('cat_id').reset_index(drop=True) cat_to_id = dict(cat_id_df.values) id_to_cat = dict(cat_id_df[['cat_id', 'cat']].values) #加载停用词 stopwords = stopwordslist("./online_shopping_10_cats/chineseStopWords.txt") #删除除字母,数字，汉字以外的所有符号 df['clean_review'] = df['review'].apply(remove_punctuation) #分词，并过滤停用词 df['cut_review'] = df['clean_review'].apply(lambda x: " ".join([w for w in list(jb.cut(x)) if w not in stopwords])) tfidf = TfidfVectorizer(norm='l2', ngram_range=(1, 2)) features = tfidf.fit_transform(df.cut_review) labels = df.cat_id X_train, X_test, y_train, y_test = train_test_split(df['cut_review'], df['cat_id'], random_state = 0) count_vect = CountVectorizer() X_train_counts = count_vect.fit_transform(X_train) tfidf_transformer = TfidfTransformer() X_train_tfidf = tfidf_transformer.fit_transform(X_train_counts) 已经写好以上代码，请补全train和test函数

以下是train和test函数的代码： python def train(X_train_tfidf, y_train): clf = MultinomialNB().fit(X_train_tfidf, y_train) return clf def test(clf, X_test): X_test_counts = count_vect.transform...

以下代码运行结果：import pandas as pd import numpy as np import jieba import re from sklearn.feature_extraction.text import TfidfVectorizer from sklearn.naive_bayes import MultinomialNB from sklearn.metrics import accuracy_score, confusion_matrix, classification_report from sklearn.model_selection import train_test_split # 读取数据 data = pd.read_csv('medical_records.csv', encoding='gbk') # 数据预处理 def clean_text(text): # 去除数字 text = re.sub(r'\d+', '', text) # 去除英文和标点符号 text = re.sub(r'[a-zA-Z’!"#$%&\'()*+,-./:;<=>?@[\\]^_{|}~]+', '', text) # 去除空格 text = re.sub(r'\s+', '', text) # 分词 words = jieba.cut(text) return ' '.join(words) data['cleaned_text'] = data['text'].apply(lambda x: clean_text(x)) # 特征提取和模型训练 tfidf = TfidfVectorizer() X = tfidf.fit_transform(data['cleaned_text']) y = data['label'] X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.3, random_state=42) clf = MultinomialNB() clf.fit(X_train, y_train) # 模型评估 y_pred = clf.predict(X_test) print('Accuracy:', accuracy_score(y_test, y_pred)) print('Confusion Matrix:', confusion_matrix(y_test, y_pred)) print('Classification Report:', classification_report(y_test, y_pred))

使用train_test_split函数将数据集分为训练集和测试集。最后使用MultinomialNB朴素贝叶斯分类器进行模型训练。 6. 模型评估，使用训练好的模型对测试数据进行预测，并使用accuracy_score、confusion_matrix和...

import pandas as pd import numpy as np import jieba import re from sklearn.feature_extraction.text import TfidfVectorizer from sklearn.naive_bayes import MultinomialNB from sklearn.metrics import accuracy_score, confusion_matrix, classification_report from sklearn.model_selection import train_test_split # 读取数据 data = pd.read_csv('medical_records.csv', encoding='gbk') # 数据预处理 def clean_text(text): # 去除数字 text = re.sub(r'\d+', '', text) # 去除英文和标点符号 text = re.sub(r'[a-zA-Z’!"#$%&\'()*+,-./:;<=>?@[\\]^_{|}~]+', '', text) # 去除空格 text = re.sub(r'\s+', '', text) # 分词 words = jieba.cut(text) return ' '.join(words) data['cleaned_text'] = data['text'].apply(lambda x: clean_text(x)) # 特征提取和模型训练 tfidf = TfidfVectorizer() X = tfidf.fit_transform(data['cleaned_text']) y = data['label'] X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.3, random_state=42) clf = MultinomialNB() clf.fit(X_train, y_train) # 模型评估 y_pred = clf.predict(X_test) print('Accuracy:', accuracy_score(y_test, y_pred)) print('Confusion Matrix:', confusion_matrix(y_test, y_pred)) print('Classification Report:', classification_report(y_test, y_pred))运行结果是什么？

由于缺少数据文件，...接着，使用sklearn库中的TfidfVectorizer类对文本进行特征提取，并使用MultinomialNB朴素贝叶斯算法进行模型训练。最后，使用测试集对模型进行评估，输出了模型的准确率、混淆矩阵和分类报告。

相关推荐

python中时间转换datetime和pd.to_datetime详析

ModuleNotFoundError: No module named ‘sklearn.cross_validation’

最新推荐

Windows平台下的Fastboot工具使用指南

管理建模和仿真的文件

DLMS规约深度剖析：从基础到电力通信标准的全面掌握

修改代码，使其正确运行

Python机器学习基础入门与项目实践

"互动学习：行动中的多样性与论文攻读经历"

【Shell脚本进阶】：wc命令行数统计的高级用法及解决方案

python编写一个程序，使得根据输入的起点和终点坐标值计算出坐标方位角

Achilles-2 原始压缩包内容解密

关系数据表示学习