# simhash **Repository Path**: mirrors_yanyiwu/simhash ## Basic Information - **Project Name**: simhash - **Description**: 中文文档simhash值计算 - **Primary Language**: Unknown - **License**: Not specified - **Default Branch**: master - **Homepage**: None - **GVP Project**: No ## Statistics - **Stars**: 1 - **Forks**: 1 - **Created**: 2020-08-19 - **Last Updated**: 2026-02-28 ## Categories & Tags **Categories**: Uncategorized **Tags**: None ## README # 专门针对中文文档的simhash算法库 [![Test](https://github.com/yanyiwu/simhash/actions/workflows/cmake.yml/badge.svg)](https://github.com/yanyiwu/simhash/actions/workflows/cmake.yml) [![Platform](https://img.shields.io/badge/platform-Linux,macOS-green.svg?style=flat)](https://github.com/yanyiwu/simhash) [![Author](https://img.shields.io/badge/author-@yanyiwu-blue.svg?style=flat)](http://yanyiwu.com/) [![License](https://img.shields.io/badge/license-MIT-yellow.svg?style=flat)](http://yanyiwu.mit-license.org) [![Tag](https://img.shields.io/github/v/tag/yanyiwu/simhash.svg)](https://github.com/yanyiwu/simhash/releases) ## 简介 此项目用来对中文文档计算出对应的 simhash 值。 simhash 是谷歌用来进行文本去重的算法，现在广泛应用在文本处理中。 详见[simhash算法原理及实现] ## 特性 + 使用 [CppJieba] 作为分词器和关键词抽取器 + 使用 [jenkins] 作为 hash 函数 + `hpp` 风格，所有源码都是 `.hpp` 文件里面，方便使用。 `没有链接，就没有伤害。` + 本项目的副产品项目：[simhash\_server] 提供了简单的 simhash HTTP 服务。 ## 依赖 * g++ (version >= 4.1 recommended), or clang++ . ## 用法 ```sh git clone --recurse-submodules https://github.com/yanyiwu/simhash.git cd simhash mkdir build cd build cmake .. make ``` 测试 ``` make test ``` ### 演示 ``` 文本："我是蓝翔技工拖拉机学院手扶拖拉机专业的。不用多久，我就会升职加薪，当上总经理，出任CEO，走上人生巅峰。" 关键词序列是: ["蓝翔:11.7392", "CEO:11.7392", "升职:10.8562", "加薪:10.6426", "手扶拖拉机:10.0089"] simhash值是: 17831459094038722629 100010110110和110001110011 simhash值的相等判断如下： 海明距离阈值默认设置为3，则isEqual结果为：0 海明距离阈值默认设置为5，则isEqual结果为：1 ``` 详情请看 [demo](https://github.com/yanyiwu/simhash-demo) ### Benchmark ```sh ./benchmark/benchmarking ``` 结果如下: ``` Running ./benchmark/benchmarking Run on (16 X 2494.14 MHz CPU s) CPU Caches: L1 Data 32 KiB (x16) L1 Instruction 32 KiB (x16) L2 Unified 4096 KiB (x16) L3 Unified 36608 KiB (x1) Load Average: 0.07, 0.04, 0.03 ***WARNING*** Library was built as DEBUG. Timings may be affected. ------------------------------------------------------------------------------------------------- Benchmark Time CPU Iterations ------------------------------------------------------------------------------------------------- BENCHMARK_Simhasher_extract_text50_top5 13478 ns 13478 ns 52013 BENCHMARK_Simhasher_extract_text50_top10 13843 ns 13843 ns 50833 BENCHMARK_Simhasher_extract_text50_top15 13929 ns 13929 ns 49488 BENCHMARK_Simhasher_extract_text50_top20 13842 ns 13842 ns 50541 BENCHMARK_Simhasher_extract_text500_top5 184074 ns 184067 ns 3775 BENCHMARK_Simhasher_make_text50_top5 14457 ns 14457 ns 48341 BENCHMARK_Simhasher_make_text50_top10 15170 ns 15169 ns 46203 BENCHMARK_Simhasher_make_text50_top15 15585 ns 15585 ns 44903 BENCHMARK_Simhasher_make_text50_top20 15743 ns 15742 ns 44466 BENCHMARK_Simhasher_binaryStringToUint64 0.000 ns 0.000 ns 1000000000 BENCHMARK_Simhasher_toBinaryString 63.9 ns 63.9 ns 10937009 BENCHMARK_Simhasher_make_from_predefined_keywords5 423 ns 423 ns 1644823 BENCHMARK_Simhasher_make_from_predefined_keywords10 735 ns 735 ns 950156 BENCHMARK_Simhasher_make_from_predefined_keywords20 1364 ns 1364 ns 508935 BENCHMARK_Simhasher_make_from_predefined_keywords50 7876 ns 7875 ns 89006 BENCHMARK_Simhasher_make_from_predefined_keywords100 21409 ns 21409 ns 32743 BENCHMARK_Simhasher_make_from_predefined_keywords200 47469 ns 47468 ns 14728 BENCHMARK_Simhasher_make_from_predefined_keywords500 124316 ns 124314 ns 5627 BENCHMARK_Simhasher_make_from_predefined_keywords1000 251336 ns 251329 ns 2785 BENCHMARK_Simhasher_binaryStringToUint64_isEqual 0.000 ns 0.000 ns 1000000000 BENCHMARK_Simhasher_binaryStringToUint64_isEqual_10k 0.000 ns 0.000 ns 1000000000 BENCHMARK_Simhasher_binaryStringToUint64_isEqual_1000k 0.000 ns 0.000 ns 1000000000 ``` [simhash算法原理及实现]:http://yanyiwu.com/work/2014/01/30/simhash-shi-xian-xiang-jie.html [CppJieba]:https://github.com/yanyiwu/cppjieba [jenkins]:https://github.com/seomoz/simhash-cpp/blob/master/src/hashes/jenkins.h [simhash\_server]:https://github.com/yanyiwu/simhash_server