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<span class="project">groonga</span>
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<span class="description">An open-source fulltext search engine and column store.</span>
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<div class="section" id="suggestion">
<h1><span class="section-number">7.20.4. </span>Suggestion<a class="headerlink" href="#suggestion" title="Permalink to this headline">¶</a></h1>
<p>This section describes about the following completion
features:</p>
<ul class="simple">
<li><p>How it works</p></li>
<li><p>How to use</p></li>
<li><p>How to learn</p></li>
</ul>
<div class="section" id="how-it-works">
<h2><span class="section-number">7.20.4.1. </span>How it works<a class="headerlink" href="#how-it-works" title="Permalink to this headline">¶</a></h2>
<p>The suggestion feature uses a search to compute suggested
words:</p>
<blockquote>
<div><ol class="arabic simple">
<li><p>Cooccurrence search against learned data.</p></li>
</ol>
</div></blockquote>
<div class="section" id="cooccurrence-search">
<h3><span class="section-number">7.20.4.1.1. </span>Cooccurrence search<a class="headerlink" href="#cooccurrence-search" title="Permalink to this headline">¶</a></h3>
<p>Cooccurrence search can find related words from user’s
input. It uses user submissions that will be learned
from query logs, access logs and so on.</p>
<p>For example, there are the following user submissions:</p>
<table class="docutils align-default">
<colgroup>
<col style="width: 100%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>query</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>search engine</p></td>
</tr>
<tr class="row-odd"><td><p>web search realtime</p></td>
</tr>
</tbody>
</table>
<p>Groonga creates the following suggestion pairs:</p>
<table class="docutils align-default">
<colgroup>
<col style="width: 22%" />
<col style="width: 78%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>input</p></th>
<th class="head"><p>suggested words</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>search</p></td>
<td><p>search engine</p></td>
</tr>
<tr class="row-odd"><td><p>engine</p></td>
<td><p>search engine</p></td>
</tr>
<tr class="row-even"><td><p>web</p></td>
<td><p>web search realtime</p></td>
</tr>
<tr class="row-odd"><td><p>search</p></td>
<td><p>web search realtime</p></td>
</tr>
<tr class="row-even"><td><p>realtime</p></td>
<td><p>web search realtime</p></td>
</tr>
</tbody>
</table>
<p>Those pairs are created by the following steps:</p>
<blockquote>
<div><ol class="arabic simple">
<li><p>Tokenizes user input query by TokenDelimit tokenizer
that uses a space as token delimiter. (e.g. “search
engine” is tokenized to two tokens “search” and
“engine”.)</p></li>
<li><p>Creates a pair that is consists of a token and original
query for each token.</p></li>
</ol>
</div></blockquote>
<p>If an user inputs “search” and cooccurrence search returns
“search engine” and “web search realtime” because “search” is
in two input columns and corresponding suggested word
columns have “search engine” and “web search realtime”.</p>
</div>
</div>
<div class="section" id="how-to-use">
<h2><span class="section-number">7.20.4.2. </span>How to use<a class="headerlink" href="#how-to-use" title="Permalink to this headline">¶</a></h2>
<p>Groonga provides <a class="reference internal" href="../commands/suggest.html"><span class="doc">suggest</span></a> command to use
suggestion. <cite>–type suggest</cite> option requests suggestion</p>
<p>For example, here is an command to get suggestion results by
“search”:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>suggest --table item_query --column kana --types suggest --frequency_threshold 1 --query search
# [
# [
# 0,
# 1337566253.89858,
# 0.000355720520019531
# ],
# {
# "suggest": [
# [
# 2
# ],
# [
# [
# "_key",
# "ShortText"
# ],
# [
# "_score",
# "Int32"
# ]
# ],
# [
# "search engine",
# 1
# ],
# [
# "web search realtime",
# 1
# ]
# ]
# }
# ]
</pre></div>
</div>
</div>
<div class="section" id="how-it-learns">
<h2><span class="section-number">7.20.4.3. </span>How it learns<a class="headerlink" href="#how-it-learns" title="Permalink to this headline">¶</a></h2>
<p>Cooccurrence search uses learned data. They are based on
query logs, access logs and so on. To create learned data,
groonga needs user input sequence with time stamp and user
submit input with time stamp.</p>
<p>For example, an user wants to search by “engine”. The user
inputs the query with the following sequence:</p>
<blockquote>
<div><ol class="arabic simple">
<li><p>2011-08-10T13:33:23+09:00: search engine (submit)</p></li>
<li><p>2011-08-10T13:33:28+09:00: web search realtime (submit)</p></li>
</ol>
</div></blockquote>
<p>Groonga can be learned from the submissions by the
following command:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>load --table event_query --each 'suggest_preparer(_id, type, item, sequence, time, pair_query)'
[
{"sequence": "1", "time": 1312950803.86057, "item": "search engine", "type": "submit"},
{"sequence": "1", "time": 1312950808.86057, "item": "web search realtime", "type": "submit"}
]
</pre></div>
</div>
</div>
<div class="section" id="how-to-extract-learning-data">
<h2><span class="section-number">7.20.4.4. </span>How to extract learning data<a class="headerlink" href="#how-to-extract-learning-data" title="Permalink to this headline">¶</a></h2>
<p>The learning data is stored into <code class="docutils literal notranslate"><span class="pre">item_DATASET</span></code> and <code class="docutils literal notranslate"><span class="pre">pair_DATASET</span></code> tables.
By using select command for such tables, you can all extract learing data.</p>
<p>Here is the query to extract all learning data:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>select item_DATASET --limit -1
select pair_DATASET --filter 'freq0 > 0 || freq1 > 0 || freq2 > 0' --limit -1
</pre></div>
</div>
<p>Without ‘–limit -1’, you can’t get all data.
In pair table, the valid value of <code class="docutils literal notranslate"><span class="pre">freq0</span></code>, <code class="docutils literal notranslate"><span class="pre">freq1</span></code> and <code class="docutils literal notranslate"><span class="pre">freq2</span></code> column must be larger than 0.</p>
<p>Don’t execute above query via HTTP request because enormous number of records are fetched.</p>
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<h3><a href="../../index.html">Table of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">7.20.4. Suggestion</a><ul>
<li><a class="reference internal" href="#how-it-works">7.20.4.1. How it works</a><ul>
<li><a class="reference internal" href="#cooccurrence-search">7.20.4.1.1. Cooccurrence search</a></li>
</ul>
</li>
<li><a class="reference internal" href="#how-to-use">7.20.4.2. How to use</a></li>
<li><a class="reference internal" href="#how-it-learns">7.20.4.3. How it learns</a></li>
<li><a class="reference internal" href="#how-to-extract-learning-data">7.20.4.4. How to extract learning data</a></li>
</ul>
</li>
</ul>
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