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README
Apache-2.0

1、mmseg4j 用 Chih-Hao Tsai 的 MMSeg 算法(http://technology.chtsai.org/mmseg/ )实现的中文分词器,并实现 lucene 的 analyzer 和 solr 的TokenizerFactory 以方便在Lucene和Solr中使用。

2、MMSeg 算法有两种分词方法:Simple和Complex,都是基于正向最大匹配。Complex 加了四个规则过虑。官方说:词语的正确识别率达到了 98.41%。mmseg4j 已经实现了这两种分词算法。

  • 1.5版的分词速度simple算法是 1100kb/s左右、complex算法是 700kb/s左右,(测试机:AMD athlon 64 2800+ 1G内存 xp)。
  • 1.6版在complex基础上实现了最多分词(max-word)。“很好听” -> "很好|好听"; “中华人民共和国” -> "中华|华人|共和|国"; “中国人民银行” -> "中国|人民|银行"。
  • 1.7-beta 版, 目前 complex 1200kb/s左右, simple 1900kb/s左右, 但内存开销了50M左右. 上几个版都是在10M左右.

mmseg4j实现的功能详情请看:http://mmseg4j.googlecode.com/svn/trunk/CHANGES.txt

3、在 com.chenlb.mmseg4j.example包里的类示例了三种分词效果。

4、在 com.chenlb.mmseg4j.analysis包里扩展lucene analyzer。MMSegAnalyzer默认使用max-word方式分词。

5、在 com.chenlb.mmseg4j.solr包里扩展solr tokenizerFactory。

在 solr的 schema.xml 中定义 field type如:

<fieldType name="textComplex" class="solr.TextField" >
  <analyzer>
    <tokenizer class="com.chenlb.mmseg4j.solr.MMSegTokenizerFactory" mode="complex" dicPath="dic"/>
  </analyzer>
</fieldType>
<fieldType name="textMaxWord" class="solr.TextField" >
  <analyzer>
    <tokenizer class="com.chenlb.mmseg4j.solr.MMSegTokenizerFactory" mode="max-word" dicPath="dic"/>
  </analyzer>
</fieldType>
<fieldType name="textSimple" class="solr.TextField" >
  <analyzer>
    <tokenizer class="com.chenlb.mmseg4j.solr.MMSegTokenizerFactory" mode="simple" dicPath="n:/OpenSource/apache-solr-1.3.0/example/solr/my_dic"/>
  </analyzer>
</fieldType>

dicPath 指定词库位置(每个MMSegTokenizerFactory可以指定不同的目录,当是相对目录时,是相对 solr.home 的目录),mode 指定分词模式(simple|complex|max-word,默认是max-word)。

6、运行,词典用mmseg.dic.path属性指定、在classpath 目录下或在当前目录下的data目录,默认是 classpath/data 目录。如果使用 mmseg4j-*-with-dic.jar 包可以不指定词库目录(如果指定也可以,它们也可以被加载)。

java -jar mmseg4j-core-1.9.0.jar 这里是字符串。

java -cp .;mmseg4j-core-1.9.0.jar -Dmmseg.dic.path=./other-dic com.chenlb.mmseg4j.example.Simple 这里是字符串。

java -cp .;mmseg4j-core-1.9.0.jar com.chenlb.mmseg4j.example.MaxWord 这里是字符串

7、一些字符的处理。英文、俄文、希腊、数字(包括①㈠⒈)的分出一连串的。目前版本没有处理小数字问题,如ⅠⅡⅢ是单字分,字库(chars.dic)中没找到也单字分。

8、词库:

  • data/chars.dic 是单字与语料中的频率,一般不用改动,1.5版本中已经加到mmseg4j的jar里了,我们不需要关心它,当然你在词库目录放这个文件可能覆盖它。
  • data/units.dic 是单字的单位,默认读jar包里的,你也可以自定义覆盖它。
  • data/words.dic 是词库文件,一行一词,当然你也可以使用自己的,1.5版本使用 sogou 词库,1.0的版本是用 rmmseg 带的词库。
  • data/wordsxxx.dic 1.6版支持多个词库文件,data 目录(或你定义的目录)下读到"words"前缀且".dic"为后缀的文件。如:data/words-my.dic。

9、MMseg4jHandler:

添加 MMseg4jHandler 类,可以在solr中用url的方式来控制加载检测词库。参数:

  • dicPath 是指定词库的目录,特性与MMSegTokenizerFactory中的dicPath一样(相对目录是,是相对 solr.home)。
  • check 是指是否检测词库,其值是true 或 on。
  • reload 是否尝试加载词库,其值是 true 或 on。此值为 true,会忽视 check 参数。

solrconfig.xml:

<requestHandler name="/mmseg4j" class="com.chenlb.mmseg4j.solr.MMseg4jHandler" >
    <lst name="defaults">
        <str name="dicPath">dic</str>
    </lst>
</requestHandler>

此功能可以让外置程序做相关的控制,如:尝试加载词库,然后外置程序决定是否重做索引。

在 solr 1.3/1.4 与 lucene 2.3/2.4/2.9 测试过,官方博客 http://blog.chenlb.com/category/mmseg4j , 如果发现问题或bug与我联系 chenlb2008#gmail.com 。

1.7.2 与 1.6.2 开始核心的程序与 lucene 和 solr 扩展分开打包,方便兼容低版本的 lucene,同时给出低版本(<= lucene 2.2)的 lucene 扩展请仿照 MMSegTokenizer.java。

1.9.0 支持 solr/lucene 4.0.0 正式版。 1.9.1 支持 solr/lucene 4.3.1

可以在 http://code.google.com/p/mmseg4j/issues/list 提出希望 mmseg4j 有的功能。

历史版本:

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MMSeg4j最新版1.9.1不支持Lucene5.0。修改MMSeg4j的源码支持lucene5.x 展开 收起
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