停用词表采用哈工大等停用词表给定数据集corpus文件地址为ELearning大三下自然语言处理corpus该数据集包含若干类数据其目录结构为:2个每个目录下面有若干个文本文件其结构如下所示:neg1txt2txtpos1txt2txt采用KNN算法或者SVM算法实现文本分类。用python编写
以下是一个基于SVM算法的文本分类代码示例:
import os
import jieba
from sklearn.feature_extraction.text import TfidfVectorizer
from sklearn.svm import SVC
from sklearn.model_selection import train_test_split
# 定义停用词表
stopwords = set()
with open('stopwords.txt', 'r', encoding='utf-8') as f:
for line in f:
stopwords.add(line.strip())
# 加载数据集
corpus_path = 'E:/Learning/大三下/自然语言处理/corpus'
categories = os.listdir(corpus_path)
corpus = []
labels = []
for i, category in enumerate(categories):
category_path = os.path.join(corpus_path, category)
for file_name in os.listdir(category_path):
file_path = os.path.join(category_path, file_name)
with open(file_path, 'r', encoding='utf-8') as f:
content = f.read()
corpus.append(content)
labels.append(i)
# 分词和去除停用词
corpus = [' '.join([word for word in jieba.cut(content) if word not in stopwords]) for content in corpus]
# 特征提取
vectorizer = TfidfVectorizer()
X = vectorizer.fit_transform(corpus)
y = labels
# 划分训练集和测试集
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42)
# 构建SVM分类器模型
clf = SVC(C=1.0, kernel='linear')
clf.fit(X_train, y_train)
# 在测试集上评估模型性能
score = clf.score(X_test, y_test)
print('Accuracy:', score)
上述代码中,我们首先加载数据集,然后对每个文本进行分词和去除停用词的操作。接着,使用TF-IDF算法对文本进行特征提取,并使用train_test_split函数将数据集划分为训练集和测试集,比例为80%和20%。最后,我们使用SVM算法构建分类器模型,并在测试集上评估模型的性能
原文地址: http://www.cveoy.top/t/topic/fmzJ 著作权归作者所有。请勿转载和采集!