High-performance BM25 Chinese text search with jieba-rs tokenizer (Rust implementation)
Project description
BM25-Jieba 中文文本搜索
基于 Rust + PyO3 的高性能 BM25 中文文本搜索库,使用 jieba-rs 进行中文分词。
特性
- 🚀 高性能: Rust 实现,比纯 Python 快数倍
- 🔤 中文分词: 内置 jieba-rs 分词器
- 🎯 精确搜索: 经典 BM25 算法
- 🔠 大小写混合: 支持大小写不敏感搜索
- 🐍 Python 3.11 ~ 3.14: 支持最新 Python 版本
安装
# 开发模式安装
uv run maturin develop
# 或构建 wheel
maturin build --release
pip install target/wheels/*.whl
快速开始
from bm25_jieba import BM25
# 准备文档
documents = [
"Python是一种广泛使用的高级编程语言",
"机器学习是人工智能的一个分支",
"深度学习是机器学习的子领域",
]
# 创建并训练模型
bm25 = BM25(k1=1.5, b=0.75)
bm25.fit(documents)
# 搜索
results = bm25.search("机器学习", top_k=3)
for doc_idx, score in results:
print(f"[{score:.4f}] {documents[doc_idx]}")
API 参考
BM25(k1=1.5, b=0.75, lowercase=False)
创建 BM25 实例。
| 参数 | 类型 | 默认值 | 说明 |
|---|---|---|---|
k1 |
float | 1.5 | 词频饱和参数 |
b |
float | 0.75 | 文档长度归一化参数 |
lowercase |
bool | False | 是否将文本转换为小写(大小写不敏感) |
fit(documents: list[str])
使用文档语料库训练模型。
search(query: str, top_k: int = None) -> list[tuple[int, float]]
搜索最相关的文档,返回 (文档索引, 分数) 列表。
get_scores(query: str) -> list[float]
获取所有文档的 BM25 分数。
开发
# 安装依赖
uv sync
# 编译并安装
uv run maturin develop
# 运行测试
uv run pytest
# 运行示例
uv run python examples/demo.py
技术栈
| 组件 | 版本 | 用途 |
|---|---|---|
| PyO3 | 0.27.2 | Rust-Python 绑定 |
| maturin | 1.11.5 | 构建工具 |
| jieba-rs | 0.8.1 | 中文分词 |
性能测试
在 Apple M1 上测试 (10,000 文档,每文档约 50 字):
| 测试项 | 结果 |
|---|---|
| 索引速度 | ~38,000 docs/s |
| 搜索 QPS | ~2,000 QPS |
| 搜索延迟 | 0.5-1.2ms |
# 运行性能测试
uv run python tests/benchmark.py
算法验证
测试语料库:19 个文档,6 个查询
| 验证项 | 结果 | 说明 |
|---|---|---|
| 公式正确性 | ✅ | 手动计算与实现一致 |
| 排序一致性 | ✅ | 6/6 查询与 rank-bm25 排序完全一致 |
| 绝对分数 | ⚠️ | 因 IDF +1 修正略有差异(符合预期) |
# 运行验证
uv sync --group validation
uv run python tests/validate.py
算法实现说明
本实现采用带 +1 修正的 IDF 公式:
IDF(t) = ln((N - df + 0.5) / (df + 0.5) + 1)
与标准 BM25Okapi 的区别:
| 公式 | 特点 |
|---|---|
标准: ln((N-df+0.5)/(df+0.5)) |
可能产生负 IDF |
本实现: ln(...+1) |
保证 IDF ≥ 0 |
影响:
- ✅ 排序一致 - 与 rank-bm25 等标准实现排序结果相同
- ⚠️ 绝对分数不同 - 因
+1修正,分数值略有差异 - ✅ 数值稳定 - 无负值,无需额外处理
这种变体在只关心相对排序(而非绝对分数)的场景下完全适用。
License
MIT
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