/doc/tagger.tagger.Stemmer-class.html

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  42.         Package&nbsp;tagger ::
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  43.         <a href="tagger.tagger-module.html">Module&nbsp;tagger</a> ::
    44. 

  44.         Class&nbsp;Stemmer
    45. 

  45.       </span>
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  46.     </td>
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    60. 

  60. <!-- ==================== CLASS DESCRIPTION ==================== -->
    61. 

  61. <h1 class="epydoc">Class Stemmer</h1><p class="nomargin-top"><span class="codelink"><a href="tagger.tagger-pysrc.html#Stemmer">source&nbsp;code</a></span></p>
    62. 

  62. <center>
    63. 

  63. <center>  <map id="class_hierarchy_for_stemmer" name="class_hierarchy_for_stemmer">
    64. 

  64. <area shape="rect" id="node1" href="tagger.extras.FastStemmer-class.html" title="extras.FastStemmer" alt="" coords="5,61,165,88"/>
    65. 

  65. <area shape="rect" id="node2" href="tagger.tagger.Stemmer-class.html" title="Stemmer" alt="" coords="44,5,127,32"/>
    66. 

  66. </map>
    67. 

  67.   <img src="class_hierarchy_for_stemmer.gif" alt='' usemap="#class_hierarchy_for_stemmer" ismap="ismap" class="graph-without-title" />
    68. 

  68. </center>
    69. 

  69. </center>
    70. 

  70. <hr />
    71. 

  71. <p>Class for extracting the stem of a word</p>
    72. 

  72.   <p>(by default it uses a simple open-source implementation of Porter's 
    73. 

  73.   algorithm; this can be improved a lot, so experimenting with different 
    74. 

  74.   ones is advisable; nltk.stem provides different algorithms for many 
    75. 

  75.   languages)</p>
    76. 

  76. 

  77. <!-- ==================== INSTANCE METHODS ==================== -->
    78. 

  78. <a name="section-InstanceMethods"></a>
    79. 

  79. <table class="summary" border="1" cellpadding="3"
    80. 

  80.        cellspacing="0" width="100%" bgcolor="white">
    81. 

  81. <tr bgcolor="#70b0f0" class="table-header">
    82. 

  82.   <td colspan="2" class="table-header">
    83. 

  83.     <table border="0" cellpadding="0" cellspacing="0" width="100%">
    84. 

  84.       <tr valign="top">
    85. 

  85.         <td align="left"><span class="table-header">Instance Methods</span></td>
    86. 

  86.         <td align="right" valign="top"
    87. 

  87.          ><span class="options">[<a href="#section-InstanceMethods"
    88. 

  88.          class="privatelink" onclick="toggle_private();"
    89. 

  89.          >hide private</a>]</span></td>
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  90.       </tr>
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  91.     </table>
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  92.   </td>
    93. 

  93. </tr>
    94. 

  94. <tr>
    95. 

  95.     <td width="15%" align="right" valign="top" class="summary">
    96. 

  96.       <span class="summary-type">&nbsp;</span>
    97. 

  97.     </td><td class="summary">
    98. 

  98.       <table width="100%" cellpadding="0" cellspacing="0" border="0">
    99. 

  99.         <tr>
    100. 

  100.           <td><span class="summary-sig"><a href="tagger.tagger.Stemmer-class.html#__call__" class="summary-sig-name">__call__</a>(<span class="summary-sig-arg">self</span>,
    101. 

  101.         <span class="summary-sig-arg">tag</span>)</span><br />
    102. 

  102.       Returns:
    103. 

  103.       the stemmed tag</td>
    104. 

  104.           <td align="right" valign="top">
    105. 

  105.             <span class="codelink"><a href="tagger.tagger-pysrc.html#Stemmer.__call__">source&nbsp;code</a></span>
    106. 

  106.             
    107. 

  107.           </td>
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  108.         </tr>
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  109.       </table>
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  110.       
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  111.     </td>
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  113. <tr>
    114. 

  114.     <td width="15%" align="right" valign="top" class="summary">
    115. 

  115.       <span class="summary-type">&nbsp;</span>
    116. 

  116.     </td><td class="summary">
    117. 

  117.       <table width="100%" cellpadding="0" cellspacing="0" border="0">
    118. 

  118.         <tr>
    119. 

  119.           <td><span class="summary-sig"><a href="tagger.tagger.Stemmer-class.html#__init__" class="summary-sig-name">__init__</a>(<span class="summary-sig-arg">self</span>,
    120. 

  120.         <span class="summary-sig-arg">stemmer</span>=<span class="summary-sig-default">None</span>)</span><br />
    121. 

  121.       Returns:
    122. 

  122.       a new <a href="tagger.tagger.Stemmer-class.html" 
    123. 

  123.       class="link">Stemmer</a> object</td>
    124. 

  124.           <td align="right" valign="top">
    125. 

  125.             <span class="codelink"><a href="tagger.tagger-pysrc.html#Stemmer.__init__">source&nbsp;code</a></span>
    126. 

  126.             
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  127.           </td>
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  130.       
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  134.     <td width="15%" align="right" valign="top" class="summary">
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  136.     </td><td class="summary">
    137. 

  137.       <table width="100%" cellpadding="0" cellspacing="0" border="0">
    138. 

  138.         <tr>
    139. 

  139.           <td><span class="summary-sig"><a href="tagger.tagger.Stemmer-class.html#preprocess" class="summary-sig-name">preprocess</a>(<span class="summary-sig-arg">self</span>,
    140. 

  140.         <span class="summary-sig-arg">string</span>)</span><br />
    141. 

  141.       Returns:
    142. 

  142.       the processed string</td>
    143. 

  143.           <td align="right" valign="top">
    144. 

  144.             <span class="codelink"><a href="tagger.tagger-pysrc.html#Stemmer.preprocess">source&nbsp;code</a></span>
    145. 

  145.             
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  146.           </td>
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  147.         </tr>
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  148.       </table>
    149. 

  149.       
    150. 

  150.     </td>
    151. 

  151.   </tr>
    152. 

  152. </table>
    153. 

  153. <!-- ==================== CLASS VARIABLES ==================== -->
    154. 

  154. <a name="section-ClassVariables"></a>
    155. 

  155. <table class="summary" border="1" cellpadding="3"
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  156.        cellspacing="0" width="100%" bgcolor="white">
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  160.       <tr valign="top">
    161. 

  161.         <td align="left"><span class="table-header">Class Variables</span></td>
    162. 

  162.         <td align="right" valign="top"
    163. 

  163.          ><span class="options">[<a href="#section-ClassVariables"
    164. 

  164.          class="privatelink" onclick="toggle_private();"
    165. 

  165.          >hide private</a>]</span></td>
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    170. 

  170. <tr>
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  171.     <td width="15%" align="right" valign="top" class="summary">
    172. 

  172.       <span class="summary-type">&nbsp;</span>
    173. 

  173.     </td><td class="summary">
    174. 

  174.         <a name="match_contractions"></a><span class="summary-name">match_contractions</span> = <code title="re.compile(r'(\w+)\'(m|re|d|ve|s|ll|t)?')">re.compile(r'<code class="re-group">(</code>\w<code class="re-op">+</code><code class="re-group">)</code>\'<code class="re-group">(</code>m<code class="re-op">|</code>re<code class="re-op">|</code>d<code class="re-op">|</code>ve<code class="re-op">|</code>s<code class="re-op">|</code>ll<code class="re-op">|</code>t<code class="re-group">)</code><code class="re-op">?</code>')</code>
    175. 

  175.     </td>
    176. 

  176.   </tr>
    177. 

  177. <tr>
    178. 

  178.     <td width="15%" align="right" valign="top" class="summary">
    179. 

  179.       <span class="summary-type">&nbsp;</span>
    180. 

  180.     </td><td class="summary">
    181. 

  181.         <a name="match_hyphens"></a><span class="summary-name">match_hyphens</span> = <code title="re.compile(r'\b[-_]\b')">re.compile(r'\b<code class="re-group">[</code>-_<code class="re-group">]</code>\b')</code>
    182. 

  182.     </td>
    183. 

  183.   </tr>
    184. 

  184. </table>
    185. 

  185. <!-- ==================== METHOD DETAILS ==================== -->
    186. 

  186. <a name="section-MethodDetails"></a>
    187. 

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    188. 

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    192. 

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    193. 

  193.         <td align="left"><span class="table-header">Method Details</span></td>
    194. 

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    195. 

  195.          ><span class="options">[<a href="#section-MethodDetails"
    196. 

  196.          class="privatelink" onclick="toggle_private();"
    197. 

  197.          >hide private</a>]</span></td>
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  201. </tr>
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    203. 

  203. <a name="__call__"></a>
    204. 

  204. <div>
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  209.   <tr valign="top"><td>
    210. 

  210.   <h3 class="epydoc"><span class="sig"><span class="sig-name">__call__</span>(<span class="sig-arg">self</span>,
    211. 

  211.         <span class="sig-arg">tag</span>)</span>
    212. 

  212.     <br /><em class="fname">(Call operator)</em>
    213. 

  213.   </h3>
    214. 

  214.   </td><td align="right" valign="top"
    215. 

  215.     ><span class="codelink"><a href="tagger.tagger-pysrc.html#Stemmer.__call__">source&nbsp;code</a></span>&nbsp;
    216. 

  216.     </td>
    217. 

  217.   </tr></table>
    218. 

  218.   
    219. 

  219.   
    220. 

  220.   <dl class="fields">
    221. 

  221.     <dt>Parameters:</dt>
    222. 

  222.     <dd><ul class="nomargin-top">
    223. 

  223.         <li><strong class="pname"><code>tag</code></strong> - the tag to be stemmed</li>
    224. 

  224.     </ul></dd>
    225. 

  225.     <dt>Returns:</dt>
    226. 

  226.         <dd>the stemmed tag</dd>
    227. 

  227.   </dl>
    228. 

  228. </td></tr></table>
    229. 

  229. </div>
    230. 

  230. <a name="__init__"></a>
    231. 

  231. <div>
    232. 

  232. <table class="details" border="1" cellpadding="3"
    233. 

  233.        cellspacing="0" width="100%" bgcolor="white">
    234. 

  234. <tr><td>
    235. 

  235.   <table width="100%" cellpadding="0" cellspacing="0" border="0">
    236. 

  236.   <tr valign="top"><td>
    237. 

  237.   <h3 class="epydoc"><span class="sig"><span class="sig-name">__init__</span>(<span class="sig-arg">self</span>,
    238. 

  238.         <span class="sig-arg">stemmer</span>=<span class="sig-default">None</span>)</span>
    239. 

  239.     <br /><em class="fname">(Constructor)</em>
    240. 

  240.   </h3>
    241. 

  241.   </td><td align="right" valign="top"
    242. 

  242.     ><span class="codelink"><a href="tagger.tagger-pysrc.html#Stemmer.__init__">source&nbsp;code</a></span>&nbsp;
    243. 

  243.     </td>
    244. 

  244.   </tr></table>
    245. 

  245.   
    246. 

  246.   
    247. 

  247.   <dl class="fields">
    248. 

  248.     <dt>Parameters:</dt>
    249. 

  249.     <dd><ul class="nomargin-top">
    250. 

  250.         <li><strong class="pname"><code>stemmer</code></strong> - an object or module with a 'stem' method (defaults to 
    251. 

  251.           stemming.porter2)</li>
    252. 

  252.     </ul></dd>
    253. 

  253.     <dt>Returns:</dt>
    254. 

  254.         <dd>a new <a href="tagger.tagger.Stemmer-class.html" 
    255. 

  255.           class="link">Stemmer</a> object</dd>
    256. 

  256.   </dl>
    257. 

  257. </td></tr></table>
    258. 

  258. </div>
    259. 

  259. <a name="preprocess"></a>
    260. 

  260. <div>
    261. 

  261. <table class="details" border="1" cellpadding="3"
    262. 

  262.        cellspacing="0" width="100%" bgcolor="white">
    263. 

  263. <tr><td>
    264. 

  264.   <table width="100%" cellpadding="0" cellspacing="0" border="0">
    265. 

  265.   <tr valign="top"><td>
    266. 

  266.   <h3 class="epydoc"><span class="sig"><span class="sig-name">preprocess</span>(<span class="sig-arg">self</span>,
    267. 

  267.         <span class="sig-arg">string</span>)</span>
    268. 

  268.   </h3>
    269. 

  269.   </td><td align="right" valign="top"
    270. 

  270.     ><span class="codelink"><a href="tagger.tagger-pysrc.html#Stemmer.preprocess">source&nbsp;code</a></span>&nbsp;
    271. 

  271.     </td>
    272. 

  272.   </tr></table>
    273. 

  273.   
    274. 

  274.   
    275. 

  275.   <dl class="fields">
    276. 

  276.     <dt>Parameters:</dt>
    277. 

  277.     <dd><ul class="nomargin-top">
    278. 

  278.         <li><strong class="pname"><code>string</code></strong> - a string to be treated before passing it to the stemmer</li>
    279. 

  279.     </ul></dd>
    280. 

  280.     <dt>Returns:</dt>
    281. 

  281.         <dd>the processed string</dd>
    282. 

  282.   </dl>
    283. 

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    284. 

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    285. 

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