1 Star 9 Fork 4

fronkx / DocDistance

加入 Gitee
与超过 1200万 开发者一起发现、参与优秀开源项目,私有仓库也完全免费 :)
免费加入
克隆/下载
贡献代码
同步代码
取消
提示: 由于 Git 不支持空文件夾,创建文件夹后会生成空的 .keep 文件
Loading...
README
Apache-2.0

DocDistance

介绍

文本相似度的设计与实现(Java实现) 本项目主要设计并实现了一个文本相似度系统,该系统主要功能计算文档之间的相似度,通过使用向量空间模型(VSM,Vector Space Model)及余弦相似度计算公式计算文档之间的相似度,数据预处理过程中加入word2vec模型进行语义扩充,从而能够匹配到更多相关文档。

向量空间模型

向量空间模型(VSM, Vector SpaceModel)由Salton等人于20世纪70年代年提出[1,2]。向量空间模型的主要思想是将文本内容的处理简化为向量空间中的向量运算,这样将空间上的相似度转化为语义上的相似度。当文档被表示为文档空间的向量时,便可通过计算向量之间的相似性来度量文档间的相似性。文本处理中最常用的相似性度量方式是余弦距离。

向量空间模型的基本思想:

给定一篇文档D=D(T1,T2,…Ti,…,Tn),若Ti在文档中既可以重复出现又存在先后次序,因此分析起来会较为困难。针对上述情况,暂不考虑Ti的顺序,并要求Ti互异,此时可将T1,T2,…Ti,…,Tn看作n维坐标,每一维对应相应值Wi,因此D(W1,W2,…,Wi,…,Wn)便可以看作一个n维向量。

例如:有一篇文档D={大家好,才是真的好},首先进行分词后转换为D={大家/好/才是/真的/好},之后提取出公因词D={大家,好,才是,真的},最后通过向量空间模型将文档转换为对应的向量D={1,2,1,1}。

向量空间模型只是将文档转换为方便计算的格式,若进行相似度计算,还需使用相似度计算公式进行计算。本文使用余弦相似度计算公式。

余弦相似度

余弦相似度计算公式广泛应用于文本数据之间的相似度计算过程中。其数学表达如下:

余弦相似度计算公式

计算过程如下:

例如,有2个文档D1={大家好},D2={才是真的好},首先将D1、D2分词后,D1={大家/好},D2={才是/真的/好},其次提取出公因词D={大家,好,才是,真的},然后通过向量空间模型转换成向量表达,D1={1,1,0,0},D2={0,1,1,1},最后进行相似度计算 余弦相似度公式

  1. 文本相似度系统 本文主要使用向量空间模型及余弦相似度距离公式进行文本相似度计算任务,系统的基本架构如下图1所示: 输入图片说明

其基本思想为:将文档输入系统,对文档进行数据预处理操作,数据预处理完成后使用向量空间模型将词组转化为向量,之后使用余弦相似度计算公式求解文档之间的相似度,最终将计算后的结果展示出来。

数据预处理阶段,包括分词、取停用词、word2vec语义扩展,其流程如下图2所示: 输入图片说明

在word2vec语义扩展阶段,Word2vec是Google于2013年发布的一款基于深度学习的开源工具包,主要用于将单词以向量形式表示[3]。Word2vec首先使用语料训练模型,待模型训练结束后,将新的单词输入模型进行预测,模型可按相关度排序将最相近的预测单词展现给用户,通常而言,会将top30展示给用户。

针对文档语义扩充,系统会先使用搜狗新闻语料训练CBOW模型,待模型训练结束后,将本档中的单词输入CBOW模型进行预测,最终将预测结果扩充回文档中,用于向量空间模型。

同样以之前的2篇文档为例,D1={大家/好},D2={才是/真的/好},通过word2vec模型后,D1={大家/好/很好/不错},D2={才是/真的/好/很好/不错},提取出公因词D={大家,好,很好,不错,才是,真的},然后通过向量空间模型转换成向量表达,D1={1,1,1,1,0,0},D2={0,1,1,1,1,1},最后进行相似度计算 输入图片说明

通过比较两次的Score值可得出,通过word2vec能够提高文本相似度的计算分值。

另外系统会计算文档中每一句话所对应的最大匹配及其相似度值,针对文档与文档的相似度计算,本文提出一种平均相似度计算公式,即: 输入图片说明

其中n(dicList1)是所求文档中包含的句子个数,公式的主要思路即将每句话的最大匹配相似度叠加后求取平均值。

参考文献:

[1]Salton G, Lesk M E. Computer Evaluation of Indexing and Text Processing[J].Journal of the Acm, 1968, 15(1):8-36.
[2]Salton. The SMART Retrieval System—Experiments in Automatic DocumentProcessing[C]// Prentice-hall, Inc Upper Saddle River. Prentice-Hall, Inc.1971.
[3]苏增才.基于word2vec和SVMperf的网络中文文本评论信息情感分类研究[D].河北科技大学,2015.

代码下载地址:

http://download.csdn.net/detail/u013473512/9742055 https://github.com/Emmitte/DocDistance

特技

  1. 使用 Readme_XXX.md 来支持不同的语言,例如 Readme_en.md, Readme_zh.md
  2. Gitee 官方博客 blog.gitee.com
  3. 你可以 https://gitee.com/explore 这个地址来了解 Gitee 上的优秀开源项目
  4. GVP 全称是 Gitee 最有价值开源项目,是综合评定出的优秀开源项目
  5. Gitee 官方提供的使用手册 https://gitee.com/help
  6. Gitee 封面人物是一档用来展示 Gitee 会员风采的栏目 https://gitee.com/gitee-stars/
Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. "License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document. "Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License. "Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. For the purposes of this definition, "control" means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity. "You" (or "Your") shall mean an individual or Legal Entity exercising permissions granted by this License. "Source" form shall mean the preferred form for making modifications, including but not limited to software source code, documentation source, and configuration files. "Object" form shall mean any form resulting from mechanical transformation or translation of a Source form, including but not limited to compiled object code, generated documentation, and conversions to other media types. "Work" shall mean the work of authorship, whether in Source or Object form, made available under the License, as indicated by a copyright notice that is included in or attached to the work (an example is provided in the Appendix below). "Derivative Works" shall mean any work, whether in Source or Object form, that is based on (or derived from) the Work and for which the editorial revisions, annotations, elaborations, or other modifications represent, as a whole, an original work of authorship. For the purposes of this License, Derivative Works shall not include works that remain separable from, or merely link (or bind by name) to the interfaces of, the Work and Derivative Works thereof. "Contribution" shall mean any work of authorship, including the original version of the Work and any modifications or additions to that Work or Derivative Works thereof, that is intentionally submitted to Licensor for inclusion in the Work by the copyright owner or by an individual or Legal Entity authorized to submit on behalf of the copyright owner. For the purposes of this definition, "submitted" means any form of electronic, verbal, or written communication sent to the Licensor or its representatives, including but not limited to communication on electronic mailing lists, source code control systems, and issue tracking systems that are managed by, or on behalf of, the Licensor for the purpose of discussing and improving the Work, but excluding communication that is conspicuously marked or otherwise designated in writing by the copyright owner as "Not a Contribution." "Contributor" shall mean Licensor and any individual or Legal Entity on behalf of whom a Contribution has been received by Licensor and subsequently incorporated within the Work. 2. Grant of Copyright License. Subject to the terms and conditions of this License, each Contributor hereby grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare Derivative Works of, publicly display, publicly perform, sublicense, and distribute the Work and such Derivative Works in Source or Object form. 3. Grant of Patent License. Subject to the terms and conditions of this License, each Contributor hereby grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable (except as stated in this section) patent license to make, have made, use, offer to sell, sell, import, and otherwise transfer the Work, where such license applies only to those patent claims licensable by such Contributor that are necessarily infringed by their Contribution(s) alone or by combination of their Contribution(s) with the Work to which such Contribution(s) was submitted. If You institute patent litigation against any entity (including a cross-claim or counterclaim in a lawsuit) alleging that the Work or a Contribution incorporated within the Work constitutes direct or contributory patent infringement, then any patent licenses granted to You under this License for that Work shall terminate as of the date such litigation is filed. 4. Redistribution. You may reproduce and distribute copies of the Work or Derivative Works thereof in any medium, with or without modifications, and in Source or Object form, provided that You meet the following conditions: (a) You must give any other recipients of the Work or Derivative Works a copy of this License; and (b) You must cause any modified files to carry prominent notices stating that You changed the files; and (c) You must retain, in the Source form of any Derivative Works that You distribute, all copyright, patent, trademark, and attribution notices from the Source form of the Work, excluding those notices that do not pertain to any part of the Derivative Works; and (d) If the Work includes a "NOTICE" text file as part of its distribution, then any Derivative Works that You distribute must include a readable copy of the attribution notices contained within such NOTICE file, excluding those notices that do not pertain to any part of the Derivative Works, in at least one of the following places: within a NOTICE text file distributed as part of the Derivative Works; within the Source form or documentation, if provided along with the Derivative Works; or, within a display generated by the Derivative Works, if and wherever such third-party notices normally appear. The contents of the NOTICE file are for informational purposes only and do not modify the License. You may add Your own attribution notices within Derivative Works that You distribute, alongside or as an addendum to the NOTICE text from the Work, provided that such additional attribution notices cannot be construed as modifying the License. You may add Your own copyright statement to Your modifications and may provide additional or different license terms and conditions for use, reproduction, or distribution of Your modifications, or for any such Derivative Works as a whole, provided Your use, reproduction, and distribution of the Work otherwise complies with the conditions stated in this License. 5. Submission of Contributions. Unless You explicitly state otherwise, any Contribution intentionally submitted for inclusion in the Work by You to the Licensor shall be under the terms and conditions of this License, without any additional terms or conditions. Notwithstanding the above, nothing herein shall supersede or modify the terms of any separate license agreement you may have executed with Licensor regarding such Contributions. 6. Trademarks. This License does not grant permission to use the trade names, trademarks, service marks, or product names of the Licensor, except as required for reasonable and customary use in describing the origin of the Work and reproducing the content of the NOTICE file. 7. Disclaimer of Warranty. Unless required by applicable law or agreed to in writing, Licensor provides the Work (and each Contributor provides its Contributions) on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied, including, without limitation, any warranties or conditions of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE. You are solely responsible for determining the appropriateness of using or redistributing the Work and assume any risks associated with Your exercise of permissions under this License. 8. Limitation of Liability. In no event and under no legal theory, whether in tort (including negligence), contract, or otherwise, unless required by applicable law (such as deliberate and grossly negligent acts) or agreed to in writing, shall any Contributor be liable to You for damages, including any direct, indirect, special, incidental, or consequential damages of any character arising as a result of this License or out of the use or inability to use the Work (including but not limited to damages for loss of goodwill, work stoppage, computer failure or malfunction, or any and all other commercial damages or losses), even if such Contributor has been advised of the possibility of such damages. 9. Accepting Warranty or Additional Liability. While redistributing the Work or Derivative Works thereof, You may choose to offer, and charge a fee for, acceptance of support, warranty, indemnity, or other liability obligations and/or rights consistent with this License. However, in accepting such obligations, You may act only on Your own behalf and on Your sole responsibility, not on behalf of any other Contributor, and only if You agree to indemnify, defend, and hold each Contributor harmless for any liability incurred by, or claims asserted against, such Contributor by reason of your accepting any such warranty or additional liability. END OF TERMS AND CONDITIONS APPENDIX: How to apply the Apache License to your work. To apply the Apache License to your work, attach the following boilerplate notice, with the fields enclosed by brackets "[]" replaced with your own identifying information. (Don't include the brackets!) The text should be enclosed in the appropriate comment syntax for the file format. We also recommend that a file or class name and description of purpose be included on the same "printed page" as the copyright notice for easier identification within third-party archives. Copyright [yyyy] [name of copyright owner] Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

简介

文本相似度的设计与实现(Java实现) 本项目主要设计并实现了一个文本相似度系统,该系统主要功能计算文档之间的相似度,通过使用向量空间模型(VSM,Vector Space Model)及余弦相似度计算公式计算文档之间的相似度,数据预处理过程中加入word2vec模型进行语义扩充,从而能够匹配到更多相关文档。 展开 收起
Java
Apache-2.0
取消

发行版

暂无发行版

贡献者

全部

近期动态

加载更多
不能加载更多了
Java
1
https://gitee.com/fronkx/DocDistance.git
git@gitee.com:fronkx/DocDistance.git
fronkx
DocDistance
DocDistance
master

搜索帮助

14c37bed 8189591 565d56ea 8189591