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<li class="nav-item nav-item-this"><a href=""><span class="section-number">7.8.12. </span><code class="docutils literal notranslate"><span class="pre">TokenMecab</span></code></a></li>
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<div class="section" id="tokenmecab">
<h1><span class="section-number">7.8.12. </span><code class="docutils literal notranslate"><span class="pre">TokenMecab</span></code><a class="headerlink" href="#tokenmecab" title="Permalink to this headline">¶</a></h1>
<div class="section" id="summary">
<h2><span class="section-number">7.8.12.1. </span>Summary<a class="headerlink" href="#summary" title="Permalink to this headline">¶</a></h2>
<p><code class="docutils literal notranslate"><span class="pre">TokenMecab</span></code> is a tokenizer based on <a class="reference external" href="https://taku910.github.io/mecab/">MeCab</a> part-of-speech and
morphological analyzer.</p>
<p>MeCab doesn’t depend on Japanese. You can use MeCab for other
languages by creating dictionary for the languages. You can use <a class="reference external" href="http://osdn.jp/projects/naist-jdic/">NAIST
Japanese Dictionary</a>
for Japanese.</p>
<p>You need to install an additional package to using TokenMecab.
For more detail of how to installing an additional package, see <a class="reference external" href="http://groonga.org/docs/install.html">how to install each OS</a> .</p>
<p><code class="docutils literal notranslate"><span class="pre">TokenMecab</span></code> is good for precision rather than recall. You can find
<code class="docutils literal notranslate"><span class="pre">東京都</span></code> and <code class="docutils literal notranslate"><span class="pre">京都</span></code> texts by <code class="docutils literal notranslate"><span class="pre">京都</span></code> query with
<a class="reference internal" href="token_bigram.html#token-bigram"><span class="std std-ref">TokenBigram</span></a> but <code class="docutils literal notranslate"><span class="pre">東京都</span></code> isn’t expected. You can find only
<code class="docutils literal notranslate"><span class="pre">京都</span></code> text by <code class="docutils literal notranslate"><span class="pre">京都</span></code> query with <code class="docutils literal notranslate"><span class="pre">TokenMecab</span></code>.</p>
<p>If you want to support neologisms, you need to keep updating your
MeCab dictionary. It needs maintain cost. (<a class="reference internal" href="token_bigram.html#token-bigram"><span class="std std-ref">TokenBigram</span></a> doesn’t
require dictionary maintenance because <a class="reference internal" href="token_bigram.html#token-bigram"><span class="std std-ref">TokenBigram</span></a> doesn’t use
dictionary.) <a class="reference external" href="https://github.com/neologd/mecab-ipadic-neologd">mecab-ipadic-NEologd : Neologism dictionary for MeCab</a> may help you.</p>
</div>
<div class="section" id="syntax">
<h2><span class="section-number">7.8.12.2. </span>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline">¶</a></h2>
<p><code class="docutils literal notranslate"><span class="pre">TokenMecab</span></code> has optional parameter.</p>
<p>No options:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>TokenMecab
</pre></div>
</div>
<p>Specify option:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>TokenMecab("include_class", true)
TokenMecab("target_class", "a_part_of_speech")
TokenMecab("include_reading", true)
TokenMecab("include_form", true)
TokenMecab("use_reading", true)
</pre></div>
</div>
<p>Specify multiple options:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>TokenMecab("target_class", "名詞", "include_reading", true)
</pre></div>
</div>
<p><code class="docutils literal notranslate"><span class="pre">TokenMecab</span></code> also specify multiple options as above.
You can also specify mingle multiple options except above example.</p>
</div>
<div class="section" id="usage">
<h2><span class="section-number">7.8.12.3. </span>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
</div>
<div class="section" id="simple-usage">
<h2><span class="section-number">7.8.12.4. </span>Simple usage<a class="headerlink" href="#simple-usage" title="Permalink to this headline">¶</a></h2>
<p>Here is an example of <code class="docutils literal notranslate"><span class="pre">TokenMeCab</span></code>. <code class="docutils literal notranslate"><span class="pre">東京都</span></code> is tokenized to <code class="docutils literal notranslate"><span class="pre">東京</span></code>
and <code class="docutils literal notranslate"><span class="pre">都</span></code>. They don’t include <code class="docutils literal notranslate"><span class="pre">京都</span></code>:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>tokenize TokenMecab "東京都"
# [
# [
# 0,
# 1545812631.661493,
# 0.0002415180206298828
# ],
# [
# {
# "value": "東京",
# "position": 0,
# "force_prefix": false,
# "force_prefix_search": false
# },
# {
# "value": "都",
# "position": 1,
# "force_prefix": false,
# "force_prefix_search": false
# }
# ]
# ]
</pre></div>
</div>
<p><code class="docutils literal notranslate"><span class="pre">TokenMecab</span></code> can also specify options.
<code class="docutils literal notranslate"><span class="pre">TokenMecab</span></code> has <code class="docutils literal notranslate"><span class="pre">target_class</span></code> option, <code class="docutils literal notranslate"><span class="pre">include_class</span></code> option,
<code class="docutils literal notranslate"><span class="pre">include_reading</span></code> option, <code class="docutils literal notranslate"><span class="pre">include_form</span></code> option and <code class="docutils literal notranslate"><span class="pre">use_reading</span></code> option.</p>
<p><code class="docutils literal notranslate"><span class="pre">target_class</span></code> option searches a token of specifying a part-of-speech.
For example, you can search only a noun as below.</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>tokenize 'TokenMecab("target_class", "名詞")' '彼の名前は山田さんのはずです。'
# [
# [
# 0,
# 1545810238.195525,
# 0.0003066062927246094
# ],
# [
# {
# "value": "彼",
# "position": 0,
# "force_prefix": false,
# "force_prefix_search": false
# },
# {
# "value": "名前",
# "position": 1,
# "force_prefix": false,
# "force_prefix_search": false
# },
# {
# "value": "山田",
# "position": 2,
# "force_prefix": false,
# "force_prefix_search": false
# },
# {
# "value": "さん",
# "position": 3,
# "force_prefix": false,
# "force_prefix_search": false
# },
# {
# "value": "はず",
# "position": 4,
# "force_prefix": false,
# "force_prefix_search": false
# }
# ]
# ]
</pre></div>
</div>
<p><code class="docutils literal notranslate"><span class="pre">include_class</span></code> option outputs class and subclass in MeCab’s metadata as below.</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>tokenize 'TokenMecab("include_class", true)' '彼の名前は山田さんのはずです。'
# [
# [
# 0,
# 1545892715.887472,
# 0.03757452964782715
# ],
# [
# {
# "value": "彼",
# "position": 0,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "class": "名詞",
# "subclass0": "代名詞",
# "subclass1": "一般"
# }
# },
# {
# "value": "の",
# "position": 1,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "class": "助詞",
# "subclass0": "連体化"
# }
# },
# {
# "value": "名前",
# "position": 2,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "class": "名詞",
# "subclass0": "一般"
# }
# },
# {
# "value": "は",
# "position": 3,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "class": "助詞",
# "subclass0": "係助詞"
# }
# },
# {
# "value": "山田",
# "position": 4,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "class": "名詞",
# "subclass0": "固有名詞",
# "subclass1": "人名",
# "subclass2": "姓"
# }
# },
# {
# "value": "さん",
# "position": 5,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "class": "名詞",
# "subclass0": "接尾",
# "subclass1": "人名"
# }
# },
# {
# "value": "の",
# "position": 6,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "class": "助詞",
# "subclass0": "連体化"
# }
# },
# {
# "value": "はず",
# "position": 7,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "class": "名詞",
# "subclass0": "非自立",
# "subclass1": "一般"
# }
# },
# {
# "value": "です",
# "position": 8,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "class": "助動詞"
# }
# },
# {
# "value": "。",
# "position": 9,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "class": "記号",
# "subclass0": "句点"
# }
# }
# ]
# ]
</pre></div>
</div>
<p>You can exclude needless token with <code class="docutils literal notranslate"><span class="pre">target_class</span></code> and class and sub class of this option outputs.</p>
<p><code class="docutils literal notranslate"><span class="pre">include_reading</span></code> outputs reading in MeCab’s metadata as below.</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>tokenize 'TokenMecab("include_reading", true)' '彼の名前は山田さんのはずです。'
# [
# [
# 0,
# 1545892913.226588,
# 0.0003414154052734375
# ],
# [
# {
# "value": "彼",
# "position": 0,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "reading": "カレ"
# }
# },
# {
# "value": "の",
# "position": 1,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "reading": "ノ"
# }
# },
# {
# "value": "名前",
# "position": 2,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "reading": "ナマエ"
# }
# },
# {
# "value": "は",
# "position": 3,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "reading": "ハ"
# }
# },
# {
# "value": "山田",
# "position": 4,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "reading": "ヤマダ"
# }
# },
# {
# "value": "さん",
# "position": 5,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "reading": "サン"
# }
# },
# {
# "value": "の",
# "position": 6,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "reading": "ノ"
# }
# },
# {
# "value": "はず",
# "position": 7,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "reading": "ハズ"
# }
# },
# {
# "value": "です",
# "position": 8,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "reading": "デス"
# }
# },
# {
# "value": "。",
# "position": 9,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "reading": "。"
# }
# }
# ]
# ]
</pre></div>
</div>
<p>You can get reading of a token with this option.</p>
<p><code class="docutils literal notranslate"><span class="pre">include_form</span></code> outputs inflected_type, inflected_form and base_form in MeCab’s metadata as below.</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>tokenize 'TokenMecab("include_form", true)' '彼の名前は山田さんのはずです。'
# [
# [
# 0,
# 1545892987.209944,
# 0.0004286766052246094
# ],
# [
# {
# "value": "彼",
# "position": 0,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "base_form": "彼"
# }
# },
# {
# "value": "の",
# "position": 1,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "base_form": "の"
# }
# },
# {
# "value": "名前",
# "position": 2,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "base_form": "名前"
# }
# },
# {
# "value": "は",
# "position": 3,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "base_form": "は"
# }
# },
# {
# "value": "山田",
# "position": 4,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "base_form": "山田"
# }
# },
# {
# "value": "さん",
# "position": 5,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "base_form": "さん"
# }
# },
# {
# "value": "の",
# "position": 6,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "base_form": "の"
# }
# },
# {
# "value": "はず",
# "position": 7,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "base_form": "はず"
# }
# },
# {
# "value": "です",
# "position": 8,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "inflected_type": "特殊・デス",
# "inflected_form": "基本形",
# "base_form": "です"
# }
# },
# {
# "value": "。",
# "position": 9,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "base_form": "。"
# }
# }
# ]
# ]
</pre></div>
</div>
<p><code class="docutils literal notranslate"><span class="pre">use_reading</span></code> supports a search by kana.
This option is useful for countermeasure of orthographical variants because it searches with kana.</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>tokenize 'TokenMecab("use_reading", true)' '彼の名前は山田さんのはずです。'
# [
# [
# 0,
# 1545893087.556662,
# 0.0003693103790283203
# ],
# [
# {
# "value": "カレ",
# "position": 0,
# "force_prefix": false,
# "force_prefix_search": false
# },
# {
# "value": "ノ",
# "position": 1,
# "force_prefix": false,
# "force_prefix_search": false
# },
# {
# "value": "ナマエ",
# "position": 2,
# "force_prefix": false,
# "force_prefix_search": false
# },
# {
# "value": "ハ",
# "position": 3,
# "force_prefix": false,
# "force_prefix_search": false
# },
# {
# "value": "ヤマダ",
# "position": 4,
# "force_prefix": false,
# "force_prefix_search": false
# },
# {
# "value": "サン",
# "position": 5,
# "force_prefix": false,
# "force_prefix_search": false
# },
# {
# "value": "ノ",
# "position": 6,
# "force_prefix": false,
# "force_prefix_search": false
# },
# {
# "value": "ハズ",
# "position": 7,
# "force_prefix": false,
# "force_prefix_search": false
# },
# {
# "value": "デス",
# "position": 8,
# "force_prefix": false,
# "force_prefix_search": false
# },
# {
# "value": "。",
# "position": 9,
# "force_prefix": false,
# "force_prefix_search": false
# }
# ]
# ]
</pre></div>
</div>
</div>
<div class="section" id="advanced-usage">
<h2><span class="section-number">7.8.12.5. </span>Advanced usage<a class="headerlink" href="#advanced-usage" title="Permalink to this headline">¶</a></h2>
<p><code class="docutils literal notranslate"><span class="pre">target_class</span></code> option can also specify subclasses and exclude or add specific
part-of-speech of specific using + or -.
So, you can also search a noun with excluding non-independent word and suffix of
person name as below.</p>
<p>In this way you can search exclude the noise of token.</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>tokenize 'TokenMecab("target_class", "-名詞/非自立", "target_class", "-名詞/接尾/人名", "target_class", "名詞")' '彼の名前は山田さんのはずです。'
# [
# [
# 0,
# 1545810363.771334,
# 0.0003197193145751953
# ],
# [
# {
# "value": "彼",
# "position": 0,
# "force_prefix": false,
# "force_prefix_search": false
# },
# {
# "value": "名前",
# "position": 1,
# "force_prefix": false,
# "force_prefix_search": false
# },
# {
# "value": "山田",
# "position": 2,
# "force_prefix": false,
# "force_prefix_search": false
# }
# ]
# ]
</pre></div>
</div>
<p>In addition, you can get reading of a token that exclude the noise with <code class="docutils literal notranslate"><span class="pre">include_reading</span></code> option as below.</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>tokenize 'TokenMecab("target_class", "-名詞/非自立", "target_class", "-名詞/接尾/人名", "target_class", "名詞", "include_reading", true)' '彼の名前は山田さんのはずです。'
# [
# [
# 0,
# 1545893197.914959,
# 0.0003139972686767578
# ],
# [
# {
# "value": "彼",
# "position": 0,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "reading": "カレ"
# }
# },
# {
# "value": "名前",
# "position": 1,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "reading": "ナマエ"
# }
# },
# {
# "value": "山田",
# "position": 2,
# "force_prefix": false,
# "force_prefix_search": false,
# "metadata": {
# "reading": "ヤマダ"
# }
# }
# ]
# ]
</pre></div>
</div>
</div>
<div class="section" id="parameters">
<h2><span class="section-number">7.8.12.6. </span>Parameters<a class="headerlink" href="#parameters" title="Permalink to this headline">¶</a></h2>
<div class="section" id="optional-parameter">
<h3><span class="section-number">7.8.12.6.1. </span>Optional parameter<a class="headerlink" href="#optional-parameter" title="Permalink to this headline">¶</a></h3>
<p>There are four optional parameters <code class="docutils literal notranslate"><span class="pre">include_class</span></code> , <code class="docutils literal notranslate"><span class="pre">target_class</span></code> , <code class="docutils literal notranslate"><span class="pre">include_form</span></code> and <code class="docutils literal notranslate"><span class="pre">use_reading</span></code> .</p>
<div class="section" id="include-class">
<h4><span class="section-number">7.8.12.6.1.1. </span><code class="docutils literal notranslate"><span class="pre">include_class</span></code><a class="headerlink" href="#include-class" title="Permalink to this headline">¶</a></h4>
<p>Outputs class and subclass in MeCab’s metadata.</p>
</div>
<div class="section" id="target-class">
<h4><span class="section-number">7.8.12.6.1.2. </span><code class="docutils literal notranslate"><span class="pre">target_class</span></code><a class="headerlink" href="#target-class" title="Permalink to this headline">¶</a></h4>
<p>Outputs a token of specifying a part-of-speech.</p>
</div>
<div class="section" id="include-reading">
<h4><span class="section-number">7.8.12.6.1.3. </span><code class="docutils literal notranslate"><span class="pre">include_reading</span></code><a class="headerlink" href="#include-reading" title="Permalink to this headline">¶</a></h4>
<p>Outputs reading in MeCab’s metadata.</p>
</div>
<div class="section" id="include-form">
<h4><span class="section-number">7.8.12.6.1.4. </span><code class="docutils literal notranslate"><span class="pre">include_form</span></code><a class="headerlink" href="#include-form" title="Permalink to this headline">¶</a></h4>
<p>Outputs inflected_type, inflected_form and base_form in MeCab’s metadata.</p>
</div>
<div class="section" id="use-reading">
<h4><span class="section-number">7.8.12.6.1.5. </span><code class="docutils literal notranslate"><span class="pre">use_reading</span></code><a class="headerlink" href="#use-reading" title="Permalink to this headline">¶</a></h4>
<p>Outputs reading of token.</p>
</div>
</div>
</div>
<div class="section" id="see-also">
<h2><span class="section-number">7.8.12.7. </span>See also<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li><p><a class="reference internal" href="../commands/tokenize.html"><span class="doc">tokenize</span></a></p></li>
</ul>
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</div>
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<h3><a href="../../index.html">Table of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">7.8.12. <code class="docutils literal notranslate"><span class="pre">TokenMecab</span></code></a><ul>
<li><a class="reference internal" href="#summary">7.8.12.1. Summary</a></li>
<li><a class="reference internal" href="#syntax">7.8.12.2. Syntax</a></li>
<li><a class="reference internal" href="#usage">7.8.12.3. Usage</a></li>
<li><a class="reference internal" href="#simple-usage">7.8.12.4. Simple usage</a></li>
<li><a class="reference internal" href="#advanced-usage">7.8.12.5. Advanced usage</a></li>
<li><a class="reference internal" href="#parameters">7.8.12.6. Parameters</a><ul>
<li><a class="reference internal" href="#optional-parameter">7.8.12.6.1. Optional parameter</a><ul>
<li><a class="reference internal" href="#include-class">7.8.12.6.1.1. <code class="docutils literal notranslate"><span class="pre">include_class</span></code></a></li>
<li><a class="reference internal" href="#target-class">7.8.12.6.1.2. <code class="docutils literal notranslate"><span class="pre">target_class</span></code></a></li>
<li><a class="reference internal" href="#include-reading">7.8.12.6.1.3. <code class="docutils literal notranslate"><span class="pre">include_reading</span></code></a></li>
<li><a class="reference internal" href="#include-form">7.8.12.6.1.4. <code class="docutils literal notranslate"><span class="pre">include_form</span></code></a></li>
<li><a class="reference internal" href="#use-reading">7.8.12.6.1.5. <code class="docutils literal notranslate"><span class="pre">use_reading</span></code></a></li>
</ul>
</li>
</ul>
</li>
<li><a class="reference internal" href="#see-also">7.8.12.7. See also</a></li>
</ul>
</li>
</ul>
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<h4>Next topic</h4>
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title="next chapter"><span class="section-number">7.8.13. </span><code class="docutils literal notranslate"><span class="pre">TokenNgram</span></code></a></p>
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