From 14a04745b31496f4565195d779b0ec2bde34ef3c Mon Sep 17 00:00:00 2001
From: 2509165015 <2509165015@student.edu.cn>
Date: Thu, 23 Apr 2026 16:02:35 +0800
Subject: [PATCH] =?UTF-8?q?3-2-1=20=E6=96=87=E6=9C=AC=E6=95=B0=E6=8D=AE?=
 =?UTF-8?q?=E5=A4=84=E7=90=86=E5=AF=BC=E8=AE=BA?=
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---
 0423+2509165015/1.py |  14 +++
 0423+2509165015/2.py |  10 ++
 0423+2509165015/3.py | 236 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 260 insertions(+)
 create mode 100644 0423+2509165015/1.py
 create mode 100644 0423+2509165015/2.py
 create mode 100644 0423+2509165015/3.py

diff --git a/0423+2509165015/1.py b/0423+2509165015/1.py
new file mode 100644
index 0000000..261f959
--- /dev/null
+++ b/0423+2509165015/1.py
@@ -0,0 +1,14 @@
+docs = [
+    "Python 是 编程 语言",
+    "Java 是 编程 语言",
+    "Python Python Python"
+]
+vocab = sorted(set(' '.join(docs).split()))
+print("词表：", vocab)
+bow_vectors = []
+for doc in docs:
+    words = doc.split()
+    vector = [words.count(word) for word in vocab]
+    bow_vectors.append(vector)
+for idx, vec in enumerate(bow_vectors):
+    print(f"Doc{idx+1}向量：{vec}")
\ No newline at end of file
diff --git a/0423+2509165015/2.py b/0423+2509165015/2.py
new file mode 100644
index 0000000..ebe815a
--- /dev/null
+++ b/0423+2509165015/2.py
@@ -0,0 +1,10 @@
+sent1 = "猫 抓 老鼠"
+sent2 = "老鼠 抓 猫"
+vocab_sent = sorted(set(sent1.split() + sent2.split()))
+vec1 = [sent1.split().count(word) for word in vocab_sent]
+vec2 = [sent2.split().count(word) for word in vocab_sent]
+print("句子1向量：", vec1)
+print("句子2向量：", vec2)
+print("向量是否相同：", vec1 == vec2)
+large_vocab = [f"word_{i}" for i in range(10000)]
+print(f"大词表维度：{len(large_vocab)}")
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diff --git a/0423+2509165015/3.py b/0423+2509165015/3.py
new file mode 100644
index 0000000..4b13b2f
--- /dev/null
+++ b/0423+2509165015/3.py
@@ -0,0 +1,236 @@
+# 安装jieba
+import subprocess
+subprocess.run(['pip', 'install', 'jieba', '-q'])
+
+print("jieba安装完成！")
+import jieba
+
+print("=" * 50)
+print("jieba分词演示")
+print("=" * 50)
+
+text = "我喜欢深度学习和人工智能"
+
+print(f"原文: {text}")
+print()
+
+# 精确模式（默认）
+words精确 = list(jieba.cut(text, cut_all=False))
+print(f"精确模式: {' / '.join(words精确)}")
+
+# 全模式
+words全 = list(jieba.cut(text, cut_all=True))
+print(f"全模式:   {' / '.join(words全)}")
+
+# 搜索引擎模式
+words搜索 = list(jieba.cut_for_search(text))
+print(f"搜索模式: {' / '.join(words搜索)}")
+# 更多分词示例
+import jieba
+
+print("=" * 50)
+print("更多分词示例")
+print("=" * 50)
+
+examples = [
+    "今天天气真不错",
+    "人工智能是未来的发展方向",
+    "Python是一门非常流行的编程语言",
+    "小明毕业于清华大学计算机系",
+    "我今天在京东买了一部iPhone手机"
+]
+
+for i, text in enumerate(examples):
+    words = list(jieba.cut(text))
+    print(f"{i+1}. {text}")
+    print(f"   → {' / '.join(words)}")
+    print()
+    import jieba.posseg as pseg
+
+print("=" * 50)
+print("jieba词性标注演示")
+print("=" * 50)
+
+text = "我喜欢深度学习和人工智能"
+
+print(f"原文: {text}")
+print()
+
+words = pseg.cut(text)
+print("分词 + 词性标注：")
+for word, flag in words:
+    print(f"  {word}: {flag}")
+    import jieba
+
+print("=" * 50)
+print("停用词处理演示")
+print("=" * 50)
+
+# 常见停用词列表
+stopwords = set(['的', '了', '在', '是', '我', '有', '和', '就', '不', '人', '都', '一', '一个', '上', '也', '很', '到', '说', '要', '去', '你', '会', '着', '没有', '看', '好', '自己', '这'])
+
+text = "人工智能是未来的发展方向，也是当前科技领域的热门话题"
+
+print(f"原文: {text}")
+print()
+
+# 不使用停用词
+words_all = list(jieba.cut(text))
+print(f"不使用停用词: {' / '.join(words_all)}")
+
+# 使用停用词
+words_filtered = [w for w in words_all if w not in stopwords]
+print(f"使用停用词:   {' / '.join(words_filtered)}")
+print()
+
+# 更完整的停用词表可以从网上下载
+print("提示：实际项目中可以从以下地方获取停用词表：")
+print("  - 哈工大停用词表")
+print("  - 百度停用词表")
+print("  - 四川大学机器学习实验室停用词表")
+# 实战：完整的文本预处理流程
+import jieba
+
+print("=" * 50)
+print("完整的文本预处理流程")
+print("=" * 50)
+
+# 示例文档集合
+docs = [
+    "今天天气真不错！适合出去玩。",
+    "Python是一门很棒的编程语言。",
+    "人工智能和机器学习是未来的发展方向。",
+    "今天在咖啡馆喝了一杯很好喝的拿铁。"
+]
+
+# 停用词表
+stopwords = set(['的', '了', '在', '是', '我', '有', '和', '就', '不', '人', '都', '一', '一个', '上', '也', '很', '到', '说', '要', '去', '你', '会', '着', '没有', '看', '好', '自己', '这', '！', '。', ','])
+
+def preprocess_text(text):
+    """完整的文本预处理流程"""
+    # 1. 分词
+    words = jieba.cut(text)
+    
+    # 2. 去除停用词
+    words = [w for w in words if w not in stopwords and len(w) > 0]
+    
+    # 3. 去除空格
+    words = [w for w in words if w.strip()]
+    
+    return words
+
+print("预处理结果：")
+for i, doc in enumerate(docs):
+    words = preprocess_text(doc)
+    print(f"\nDoc{i+1}: {doc}")
+    print(f"  → {' / '.join(words)}")
+    # 实战：jieba分词 + TF-IDF完整流程
+import jieba
+import math
+
+print("=" * 50)
+print("实战：jieba分词 + TF-IDF完整流程")
+print("=" * 50)
+
+def simple_tfidf_tokenized(docs, stopwords=None):
+    """
+    结合分词的TF-IDF实现
+    参数:
+        docs: 原始文档列表
+        stopwords: 停用词集合
+    返回:
+        vocab, tfidf_matrix
+    """
+    # 1. 分词
+    tokenized = []
+    for doc in docs:
+        words = jieba.cut(doc)
+        if stopwords:
+            words = [w for w in words if w not in stopwords and len(w) > 1]
+        else:
+            words = [w for w in words if len(w) > 1]
+        tokenized.append(words)
+    
+    # 2. 构建词表
+    vocab_set = set()
+    for doc in tokenized:
+        vocab_set.update(doc)
+    vocab = sorted(list(vocab_set))
+    
+    # 3. 构建TF矩阵并计算IDF
+    n_docs = len(tokenized)
+    tf_matrix = []
+    df_dict = {word: 0 for word in vocab}
+    
+    for doc in tokenized:
+        vec = [0] * len(vocab)
+        for word in doc:
+            if word in vocab:
+                idx = vocab.index(word)
+                vec[idx] += 1
+        tf_matrix.append(vec)
+    
+    # 计算DF
+    for vec in tf_matrix:
+        for j, count in enumerate(vec):
+            if count > 0:
+                word = vocab[j]
+                df_dict[word] += 1
+    
+    # 计算IDF
+    idf = []
+    for word in vocab:
+        df = df_dict[word]
+        idf_j = math.log(n_docs / (df + 1)) + 1
+        idf.append(idf_j)
+    
+   
+print(f"分词结果：")
+for i, words in enumerate(tokenized):
+    print(f"  D # 计算TF-IDF
+    tfidf = []
+    for vec in tf_matrix:
+        tfidf_vec = [vec[i] * idf[i] for i in range(len(vec))]
+        tfidf.append(tfidf_vec)
+    
+    return vocab, tfidf, tokenized
+
+# 示例文档集合
+docs = [
+    "Python是一门很棒的编程语言",
+    "人工智能是未来的发展方向",
+    "深度学习是机器学习的一个分支",
+    "Python和Java都是很流行的编程语言"
+]
+
+# 停用词
+stopwords = set(["的", "是", "一个", "很", "和", "在", "了"])
+
+vocab, tfidf_matrix, tokenized = simple_tfidf_tokenized(docs, stopwords)
+
+print("文档集合：")
+for i, doc in enumerate(docs):
+    print(f"  Doc{i+1}: {doc}")
+print()
+oc{i+1}: {' / '.join(words)}")
+print()
+
+print(f"词表（共{len(vocab)}个词）:")
+print(f"  {vocab}")
+print()
+
+print("TF-IDF矩阵：")
+for i, vec in enumerate(tfidf_matrix):
+    # 只显示非零值
+    nonzero = [(vocab[j], round(vec[j], 4)) for j in range(len(vec)) if vec[j] > 0]
+    print(f"  Doc{i+1}: {nonzero}")
+
+print()
+
+# 找每个文档最重要的词
+print("每个文档最重要的词（TF-IDF值最高）：")
+for i, vec in enumerate(tfidf_matrix):
+    max_idx = max(range(len(vec)), key=lambda j: vec[j])
+    max_score = vec[max_idx]
+    if max_score > 0:
+        print(f"  Doc{i+1}: '{vocab[max_idx]}' (TF-IDF={max_score:.4f})")
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