f_test = open(os.path.join(list_path, 'test_list.txt'), 'w', encoding='utf-8')

这行代码创建了一个名为 `f_test` 的文件对象，它打开了名为 `test_list.txt` 的文件，并使用 UTF-8 编码格式进行写入操作。`os.path.join()` 函数是用来连接路径的，它将 `list_path` 和 `test_list.txt` 这两个路径合并为一个完整的路径，避免了手动拼接路径字符串的麻烦。最后，`'w'` 参数指示打开文件以进行写入操作。

相关问题

import osimport jiebaimport numpy as npfrom sklearn.naive_bayes import MultinomialNBfrom sklearn.metrics import accuracy_score# 定义常量data_dir = './data'stopwords_path = './stopwords.txt'category_names = ['文学', '教育', '计算机', '医学', '体育']# 加载停用词stopwords = set()with open(stopwords_path, 'r', encoding='utf-8') as f: for line in f: stopwords.add(line.strip())# 加载语料库，构建训练集和测试集train_data = []train_labels = []test_data = []test_labels = []for i, category_name in enumerate(category_names): category_dir = os.path.join(data_dir, category_name) file_names = os.listdir(category_dir) for j, file_name in enumerate(file_names): with open(os.path.join(category_dir, file_name), 'r', encoding='utf-8') as f: content = f.read() words = [word for word in jieba.cut(content) if word not in stopwords] if j < 3: test_data.append(words) test_labels.append(i) else: train_data.append(words) train_labels.append(i)# 构建词汇表vocab = set()for document in train_data: vocab |= set(document)vocab = list(vocab)vocab.sort()# 构建文档向量def document2vector(document, vocab): vector = np.zeros(len(vocab)) for word in document: if word in vocab: vector[vocab.index(word)] += 1 return vectortrain_vectors = np.array([document2vector(document, vocab) for document in train_data])test_vectors = np.array([document2vector(document, vocab) for document in test_data])# 训练朴素贝叶斯分类器clf = MultinomialNB()clf.fit(train_vectors, train_labels)# 测试分类器predicted_labels = clf.predict(test_vectors)# 评估分类器accuracy = accuracy_score(test_labels, predicted_labels)print('Accuracy:', accuracy)

这段代码实现了一个基于朴素贝叶斯分类器的文本分类器，主要分为以下几个步骤：

1. 加载停用词文件，并存储在一个集合中。
2. 加载语料库，并将每个文档进行分词，去除停用词，并将前三个文档作为测试集，其余的作为训练集。
3. 构建词汇表，将训练集中的所有词语去重后按字典序排序后存储在一个列表中。
4. 将每个文档转化为词向量，其长度为词汇表的长度，每个位置表示对应词汇在该文档中出现的次数。
5. 使用训练集训练一个朴素贝叶斯分类器，并使用测试集测试该分类器的准确率。

需要注意的是，该代码中使用的是多项式朴素贝叶斯分类器（MultinomialNB），因此假设每个词汇的出现次数是服从多项式分布的。同时，该代码中使用的是中文分词工具jieba，因此需要确保该工具已被正确安装。

请在注释处填入代码完成对训练集和测试集的结巴分词from paddlenlp.datasets import load_dataset def read(data_path): data_set = [] with open(data_path, 'r', encoding='utf-8') as f: for line in f: l = line.strip('\n').split('\t') if len(l) != 2: print (len(l), line) words, labels = line.strip('\n').split('\t') data_set.append((words,labels)) return data_set train_ds = read(data_path='train.txt') dev_ds = read(data_path='dev.txt') test_ds = read(data_path='test.txt') for i in range(5): print("sentence %d" % (i), train_ds[i][0]) print("sentence %d" % (i), train_ds[i][1]) print(len(train_ds),len(dev_ds)) import jieba def data_preprocess(corpus): data_set = [] ####填结巴分词代码 for text in corpus: seg_list = jieba.cut(text) data_set.append(" ".join(seg_list)) return data_set train_corpus = data_preprocess(train_ds) test_corpus = data_preprocess(test_ds) print(train_corpus[:2]) print(test_corpus[:2])

from paddlenlp.datasets import load_dataset
def read(data_path):
data_set = []
with open(data_path, 'r', encoding='utf-8') as f:
for line in f:
l = line.strip('\n').split('\t')
if len(l) != 2:
print (len(l), line)
words, labels = line.strip('\n').split('\t')
data_set.append((words,labels))
return data_set

train_ds = read(data_path='train.txt')
dev_ds = read(data_path='dev.txt')
test_ds = read(data_path='test.txt')

for i in range(5):
print("sentence %d" % (i), train_ds[i][0])
print("sentence %d" % (i), train_ds[i][1])

print(len(train_ds),len(dev_ds))

import jieba

def data_preprocess(corpus):
data_set = []
for text in corpus:
seg_list = jieba.cut(text[0])
data_set.append((" ".join(seg_list), text[1]))
return data_set

train_corpus = data_preprocess(train_ds)
test_corpus = data_preprocess(test_ds)

print(train_corpus[:2])
print(test_corpus[:2])