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<!DOCTYPE html>
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<title>NLTK :: nltk.chunk.named_entity</title>
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<h1>Source code for nltk.chunk.named_entity</h1><div class="highlight"><pre>
<span></span><span class="c1"># Natural Language Toolkit: Chunk parsing API</span>
<span class="c1">#</span>
<span class="c1"># Copyright (C) 2001-2021 NLTK Project</span>
<span class="c1"># Author: Edward Loper <edloper@gmail.com></span>
<span class="c1"># URL: <http://nltk.org/></span>
<span class="c1"># For license information, see LICENSE.TXT</span>
<span class="sd">"""</span>
<span class="sd">Named entity chunker</span>
<span class="sd">"""</span>
<span class="kn">import</span> <span class="nn">os</span>
<span class="kn">import</span> <span class="nn">pickle</span>
<span class="kn">import</span> <span class="nn">re</span>
<span class="kn">from</span> <span class="nn">xml.etree</span> <span class="kn">import</span> <span class="n">ElementTree</span> <span class="k">as</span> <span class="n">ET</span>
<span class="kn">from</span> <span class="nn">nltk.tag</span> <span class="kn">import</span> <span class="n">ClassifierBasedTagger</span><span class="p">,</span> <span class="n">pos_tag</span>
<span class="k">try</span><span class="p">:</span>
<span class="kn">from</span> <span class="nn">nltk.classify</span> <span class="kn">import</span> <span class="n">MaxentClassifier</span>
<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
<span class="k">pass</span>
<span class="kn">from</span> <span class="nn">nltk.chunk.api</span> <span class="kn">import</span> <span class="n">ChunkParserI</span>
<span class="kn">from</span> <span class="nn">nltk.chunk.util</span> <span class="kn">import</span> <span class="n">ChunkScore</span>
<span class="kn">from</span> <span class="nn">nltk.data</span> <span class="kn">import</span> <span class="n">find</span>
<span class="kn">from</span> <span class="nn">nltk.tokenize</span> <span class="kn">import</span> <span class="n">word_tokenize</span>
<span class="kn">from</span> <span class="nn">nltk.tree</span> <span class="kn">import</span> <span class="n">Tree</span>
<div class="viewcode-block" id="NEChunkParserTagger"><a class="viewcode-back" href="../../../api/nltk.chunk.named_entity.html#nltk.chunk.named_entity.NEChunkParserTagger">[docs]</a><span class="k">class</span> <span class="nc">NEChunkParserTagger</span><span class="p">(</span><span class="n">ClassifierBasedTagger</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> The IOB tagger used by the chunk parser.</span>
<span class="sd"> """</span>
<div class="viewcode-block" id="NEChunkParserTagger.__init__"><a class="viewcode-back" href="../../../api/nltk.chunk.named_entity.html#nltk.chunk.named_entity.NEChunkParserTagger.__init__">[docs]</a> <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">train</span><span class="p">):</span>
<span class="n">ClassifierBasedTagger</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span>
<span class="bp">self</span><span class="p">,</span> <span class="n">train</span><span class="o">=</span><span class="n">train</span><span class="p">,</span> <span class="n">classifier_builder</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">_classifier_builder</span>
<span class="p">)</span></div>
<span class="k">def</span> <span class="nf">_classifier_builder</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">train</span><span class="p">):</span>
<span class="k">return</span> <span class="n">MaxentClassifier</span><span class="o">.</span><span class="n">train</span><span class="p">(</span>
<span class="n">train</span><span class="p">,</span> <span class="n">algorithm</span><span class="o">=</span><span class="s2">"megam"</span><span class="p">,</span> <span class="n">gaussian_prior_sigma</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">trace</span><span class="o">=</span><span class="mi">2</span>
<span class="p">)</span>
<span class="k">def</span> <span class="nf">_english_wordlist</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">wl</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_en_wordlist</span>
<span class="k">except</span> <span class="ne">AttributeError</span><span class="p">:</span>
<span class="kn">from</span> <span class="nn">nltk.corpus</span> <span class="kn">import</span> <span class="n">words</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_en_wordlist</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">words</span><span class="o">.</span><span class="n">words</span><span class="p">(</span><span class="s2">"en-basic"</span><span class="p">))</span>
<span class="n">wl</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_en_wordlist</span>
<span class="k">return</span> <span class="n">wl</span>
<span class="k">def</span> <span class="nf">_feature_detector</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">tokens</span><span class="p">,</span> <span class="n">index</span><span class="p">,</span> <span class="n">history</span><span class="p">):</span>
<span class="n">word</span> <span class="o">=</span> <span class="n">tokens</span><span class="p">[</span><span class="n">index</span><span class="p">][</span><span class="mi">0</span><span class="p">]</span>
<span class="n">pos</span> <span class="o">=</span> <span class="n">simplify_pos</span><span class="p">(</span><span class="n">tokens</span><span class="p">[</span><span class="n">index</span><span class="p">][</span><span class="mi">1</span><span class="p">])</span>
<span class="k">if</span> <span class="n">index</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
<span class="n">prevword</span> <span class="o">=</span> <span class="n">prevprevword</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">prevpos</span> <span class="o">=</span> <span class="n">prevprevpos</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">prevshape</span> <span class="o">=</span> <span class="n">prevtag</span> <span class="o">=</span> <span class="n">prevprevtag</span> <span class="o">=</span> <span class="kc">None</span>
<span class="k">elif</span> <span class="n">index</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
<span class="n">prevword</span> <span class="o">=</span> <span class="n">tokens</span><span class="p">[</span><span class="n">index</span> <span class="o">-</span> <span class="mi">1</span><span class="p">][</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span>
<span class="n">prevprevword</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">prevpos</span> <span class="o">=</span> <span class="n">simplify_pos</span><span class="p">(</span><span class="n">tokens</span><span class="p">[</span><span class="n">index</span> <span class="o">-</span> <span class="mi">1</span><span class="p">][</span><span class="mi">1</span><span class="p">])</span>
<span class="n">prevprevpos</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">prevtag</span> <span class="o">=</span> <span class="n">history</span><span class="p">[</span><span class="n">index</span> <span class="o">-</span> <span class="mi">1</span><span class="p">][</span><span class="mi">0</span><span class="p">]</span>
<span class="n">prevshape</span> <span class="o">=</span> <span class="n">prevprevtag</span> <span class="o">=</span> <span class="kc">None</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">prevword</span> <span class="o">=</span> <span class="n">tokens</span><span class="p">[</span><span class="n">index</span> <span class="o">-</span> <span class="mi">1</span><span class="p">][</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span>
<span class="n">prevprevword</span> <span class="o">=</span> <span class="n">tokens</span><span class="p">[</span><span class="n">index</span> <span class="o">-</span> <span class="mi">2</span><span class="p">][</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span>
<span class="n">prevpos</span> <span class="o">=</span> <span class="n">simplify_pos</span><span class="p">(</span><span class="n">tokens</span><span class="p">[</span><span class="n">index</span> <span class="o">-</span> <span class="mi">1</span><span class="p">][</span><span class="mi">1</span><span class="p">])</span>
<span class="n">prevprevpos</span> <span class="o">=</span> <span class="n">simplify_pos</span><span class="p">(</span><span class="n">tokens</span><span class="p">[</span><span class="n">index</span> <span class="o">-</span> <span class="mi">2</span><span class="p">][</span><span class="mi">1</span><span class="p">])</span>
<span class="n">prevtag</span> <span class="o">=</span> <span class="n">history</span><span class="p">[</span><span class="n">index</span> <span class="o">-</span> <span class="mi">1</span><span class="p">]</span>
<span class="n">prevprevtag</span> <span class="o">=</span> <span class="n">history</span><span class="p">[</span><span class="n">index</span> <span class="o">-</span> <span class="mi">2</span><span class="p">]</span>
<span class="n">prevshape</span> <span class="o">=</span> <span class="n">shape</span><span class="p">(</span><span class="n">prevword</span><span class="p">)</span>
<span class="k">if</span> <span class="n">index</span> <span class="o">==</span> <span class="nb">len</span><span class="p">(</span><span class="n">tokens</span><span class="p">)</span> <span class="o">-</span> <span class="mi">1</span><span class="p">:</span>
<span class="n">nextword</span> <span class="o">=</span> <span class="n">nextnextword</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">nextpos</span> <span class="o">=</span> <span class="n">nextnextpos</span> <span class="o">=</span> <span class="kc">None</span>
<span class="k">elif</span> <span class="n">index</span> <span class="o">==</span> <span class="nb">len</span><span class="p">(</span><span class="n">tokens</span><span class="p">)</span> <span class="o">-</span> <span class="mi">2</span><span class="p">:</span>
<span class="n">nextword</span> <span class="o">=</span> <span class="n">tokens</span><span class="p">[</span><span class="n">index</span> <span class="o">+</span> <span class="mi">1</span><span class="p">][</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span>
<span class="n">nextpos</span> <span class="o">=</span> <span class="n">tokens</span><span class="p">[</span><span class="n">index</span> <span class="o">+</span> <span class="mi">1</span><span class="p">][</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span>
<span class="n">nextnextword</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">nextnextpos</span> <span class="o">=</span> <span class="kc">None</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">nextword</span> <span class="o">=</span> <span class="n">tokens</span><span class="p">[</span><span class="n">index</span> <span class="o">+</span> <span class="mi">1</span><span class="p">][</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span>
<span class="n">nextpos</span> <span class="o">=</span> <span class="n">tokens</span><span class="p">[</span><span class="n">index</span> <span class="o">+</span> <span class="mi">1</span><span class="p">][</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span>
<span class="n">nextnextword</span> <span class="o">=</span> <span class="n">tokens</span><span class="p">[</span><span class="n">index</span> <span class="o">+</span> <span class="mi">2</span><span class="p">][</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span>
<span class="n">nextnextpos</span> <span class="o">=</span> <span class="n">tokens</span><span class="p">[</span><span class="n">index</span> <span class="o">+</span> <span class="mi">2</span><span class="p">][</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span>
<span class="c1"># 89.6</span>
<span class="n">features</span> <span class="o">=</span> <span class="p">{</span>
<span class="s2">"bias"</span><span class="p">:</span> <span class="kc">True</span><span class="p">,</span>
<span class="s2">"shape"</span><span class="p">:</span> <span class="n">shape</span><span class="p">(</span><span class="n">word</span><span class="p">),</span>
<span class="s2">"wordlen"</span><span class="p">:</span> <span class="nb">len</span><span class="p">(</span><span class="n">word</span><span class="p">),</span>
<span class="s2">"prefix3"</span><span class="p">:</span> <span class="n">word</span><span class="p">[:</span><span class="mi">3</span><span class="p">]</span><span class="o">.</span><span class="n">lower</span><span class="p">(),</span>
<span class="s2">"suffix3"</span><span class="p">:</span> <span class="n">word</span><span class="p">[</span><span class="o">-</span><span class="mi">3</span><span class="p">:]</span><span class="o">.</span><span class="n">lower</span><span class="p">(),</span>
<span class="s2">"pos"</span><span class="p">:</span> <span class="n">pos</span><span class="p">,</span>
<span class="s2">"word"</span><span class="p">:</span> <span class="n">word</span><span class="p">,</span>
<span class="s2">"en-wordlist"</span><span class="p">:</span> <span class="p">(</span><span class="n">word</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_english_wordlist</span><span class="p">()),</span>
<span class="s2">"prevtag"</span><span class="p">:</span> <span class="n">prevtag</span><span class="p">,</span>
<span class="s2">"prevpos"</span><span class="p">:</span> <span class="n">prevpos</span><span class="p">,</span>
<span class="s2">"nextpos"</span><span class="p">:</span> <span class="n">nextpos</span><span class="p">,</span>
<span class="s2">"prevword"</span><span class="p">:</span> <span class="n">prevword</span><span class="p">,</span>
<span class="s2">"nextword"</span><span class="p">:</span> <span class="n">nextword</span><span class="p">,</span>
<span class="s2">"word+nextpos"</span><span class="p">:</span> <span class="sa">f</span><span class="s2">"</span><span class="si">{</span><span class="n">word</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span><span class="si">}</span><span class="s2">+</span><span class="si">{</span><span class="n">nextpos</span><span class="si">}</span><span class="s2">"</span><span class="p">,</span>
<span class="s2">"pos+prevtag"</span><span class="p">:</span> <span class="sa">f</span><span class="s2">"</span><span class="si">{</span><span class="n">pos</span><span class="si">}</span><span class="s2">+</span><span class="si">{</span><span class="n">prevtag</span><span class="si">}</span><span class="s2">"</span><span class="p">,</span>
<span class="s2">"shape+prevtag"</span><span class="p">:</span> <span class="sa">f</span><span class="s2">"</span><span class="si">{</span><span class="n">prevshape</span><span class="si">}</span><span class="s2">+</span><span class="si">{</span><span class="n">prevtag</span><span class="si">}</span><span class="s2">"</span><span class="p">,</span>
<span class="p">}</span>
<span class="k">return</span> <span class="n">features</span></div>
<div class="viewcode-block" id="NEChunkParser"><a class="viewcode-back" href="../../../api/nltk.chunk.named_entity.html#nltk.chunk.named_entity.NEChunkParser">[docs]</a><span class="k">class</span> <span class="nc">NEChunkParser</span><span class="p">(</span><span class="n">ChunkParserI</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Expected input: list of pos-tagged words</span>
<span class="sd"> """</span>
<div class="viewcode-block" id="NEChunkParser.__init__"><a class="viewcode-back" href="../../../api/nltk.chunk.named_entity.html#nltk.chunk.named_entity.NEChunkParser.__init__">[docs]</a> <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">train</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_train</span><span class="p">(</span><span class="n">train</span><span class="p">)</span></div>
<div class="viewcode-block" id="NEChunkParser.parse"><a class="viewcode-back" href="../../../api/nltk.chunk.named_entity.html#nltk.chunk.named_entity.NEChunkParser.parse">[docs]</a> <span class="k">def</span> <span class="nf">parse</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">tokens</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Each token should be a pos-tagged word</span>
<span class="sd"> """</span>
<span class="n">tagged</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_tagger</span><span class="o">.</span><span class="n">tag</span><span class="p">(</span><span class="n">tokens</span><span class="p">)</span>
<span class="n">tree</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_tagged_to_parse</span><span class="p">(</span><span class="n">tagged</span><span class="p">)</span>
<span class="k">return</span> <span class="n">tree</span></div>
<span class="k">def</span> <span class="nf">_train</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">corpus</span><span class="p">):</span>
<span class="c1"># Convert to tagged sequence</span>
<span class="n">corpus</span> <span class="o">=</span> <span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">_parse_to_tagged</span><span class="p">(</span><span class="n">s</span><span class="p">)</span> <span class="k">for</span> <span class="n">s</span> <span class="ow">in</span> <span class="n">corpus</span><span class="p">]</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_tagger</span> <span class="o">=</span> <span class="n">NEChunkParserTagger</span><span class="p">(</span><span class="n">train</span><span class="o">=</span><span class="n">corpus</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">_tagged_to_parse</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">tagged_tokens</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Convert a list of tagged tokens to a chunk-parse tree.</span>
<span class="sd"> """</span>
<span class="n">sent</span> <span class="o">=</span> <span class="n">Tree</span><span class="p">(</span><span class="s2">"S"</span><span class="p">,</span> <span class="p">[])</span>
<span class="k">for</span> <span class="p">(</span><span class="n">tok</span><span class="p">,</span> <span class="n">tag</span><span class="p">)</span> <span class="ow">in</span> <span class="n">tagged_tokens</span><span class="p">:</span>
<span class="k">if</span> <span class="n">tag</span> <span class="o">==</span> <span class="s2">"O"</span><span class="p">:</span>
<span class="n">sent</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">tok</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">tag</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s2">"B-"</span><span class="p">):</span>
<span class="n">sent</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">Tree</span><span class="p">(</span><span class="n">tag</span><span class="p">[</span><span class="mi">2</span><span class="p">:],</span> <span class="p">[</span><span class="n">tok</span><span class="p">]))</span>
<span class="k">elif</span> <span class="n">tag</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s2">"I-"</span><span class="p">):</span>
<span class="k">if</span> <span class="n">sent</span> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">sent</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">],</span> <span class="n">Tree</span><span class="p">)</span> <span class="ow">and</span> <span class="n">sent</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">label</span><span class="p">()</span> <span class="o">==</span> <span class="n">tag</span><span class="p">[</span><span class="mi">2</span><span class="p">:]:</span>
<span class="n">sent</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">tok</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">sent</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">Tree</span><span class="p">(</span><span class="n">tag</span><span class="p">[</span><span class="mi">2</span><span class="p">:],</span> <span class="p">[</span><span class="n">tok</span><span class="p">]))</span>
<span class="k">return</span> <span class="n">sent</span>
<span class="nd">@staticmethod</span>
<span class="k">def</span> <span class="nf">_parse_to_tagged</span><span class="p">(</span><span class="n">sent</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Convert a chunk-parse tree to a list of tagged tokens.</span>
<span class="sd"> """</span>
<span class="n">toks</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">for</span> <span class="n">child</span> <span class="ow">in</span> <span class="n">sent</span><span class="p">:</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">child</span><span class="p">,</span> <span class="n">Tree</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">child</span><span class="p">)</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"Warning -- empty chunk in sentence"</span><span class="p">)</span>
<span class="k">continue</span>
<span class="n">toks</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">child</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="sa">f</span><span class="s2">"B-</span><span class="si">{</span><span class="n">child</span><span class="o">.</span><span class="n">label</span><span class="p">()</span><span class="si">}</span><span class="s2">"</span><span class="p">))</span>
<span class="k">for</span> <span class="n">tok</span> <span class="ow">in</span> <span class="n">child</span><span class="p">[</span><span class="mi">1</span><span class="p">:]:</span>
<span class="n">toks</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">tok</span><span class="p">,</span> <span class="sa">f</span><span class="s2">"I-</span><span class="si">{</span><span class="n">child</span><span class="o">.</span><span class="n">label</span><span class="p">()</span><span class="si">}</span><span class="s2">"</span><span class="p">))</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">toks</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">child</span><span class="p">,</span> <span class="s2">"O"</span><span class="p">))</span>
<span class="k">return</span> <span class="n">toks</span></div>
<div class="viewcode-block" id="shape"><a class="viewcode-back" href="../../../api/nltk.chunk.named_entity.html#nltk.chunk.named_entity.shape">[docs]</a><span class="k">def</span> <span class="nf">shape</span><span class="p">(</span><span class="n">word</span><span class="p">):</span>
<span class="k">if</span> <span class="n">re</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="sa">r</span><span class="s2">"[0-9]+(\.[0-9]*)?|[0-9]*\.[0-9]+$"</span><span class="p">,</span> <span class="n">word</span><span class="p">,</span> <span class="n">re</span><span class="o">.</span><span class="n">UNICODE</span><span class="p">):</span>
<span class="k">return</span> <span class="s2">"number"</span>
<span class="k">elif</span> <span class="n">re</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="sa">r</span><span class="s2">"\W+$"</span><span class="p">,</span> <span class="n">word</span><span class="p">,</span> <span class="n">re</span><span class="o">.</span><span class="n">UNICODE</span><span class="p">):</span>
<span class="k">return</span> <span class="s2">"punct"</span>
<span class="k">elif</span> <span class="n">re</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="sa">r</span><span class="s2">"\w+$"</span><span class="p">,</span> <span class="n">word</span><span class="p">,</span> <span class="n">re</span><span class="o">.</span><span class="n">UNICODE</span><span class="p">):</span>
<span class="k">if</span> <span class="n">word</span><span class="o">.</span><span class="n">istitle</span><span class="p">():</span>
<span class="k">return</span> <span class="s2">"upcase"</span>
<span class="k">elif</span> <span class="n">word</span><span class="o">.</span><span class="n">islower</span><span class="p">():</span>
<span class="k">return</span> <span class="s2">"downcase"</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="s2">"mixedcase"</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="s2">"other"</span></div>
<div class="viewcode-block" id="simplify_pos"><a class="viewcode-back" href="../../../api/nltk.chunk.named_entity.html#nltk.chunk.named_entity.simplify_pos">[docs]</a><span class="k">def</span> <span class="nf">simplify_pos</span><span class="p">(</span><span class="n">s</span><span class="p">):</span>
<span class="k">if</span> <span class="n">s</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s2">"V"</span><span class="p">):</span>
<span class="k">return</span> <span class="s2">"V"</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="n">s</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s2">"-"</span><span class="p">)[</span><span class="mi">0</span><span class="p">]</span></div>
<div class="viewcode-block" id="postag_tree"><a class="viewcode-back" href="../../../api/nltk.chunk.named_entity.html#nltk.chunk.named_entity.postag_tree">[docs]</a><span class="k">def</span> <span class="nf">postag_tree</span><span class="p">(</span><span class="n">tree</span><span class="p">):</span>
<span class="c1"># Part-of-speech tagging.</span>
<span class="n">words</span> <span class="o">=</span> <span class="n">tree</span><span class="o">.</span><span class="n">leaves</span><span class="p">()</span>
<span class="n">tag_iter</span> <span class="o">=</span> <span class="p">(</span><span class="n">pos</span> <span class="k">for</span> <span class="p">(</span><span class="n">word</span><span class="p">,</span> <span class="n">pos</span><span class="p">)</span> <span class="ow">in</span> <span class="n">pos_tag</span><span class="p">(</span><span class="n">words</span><span class="p">))</span>
<span class="n">newtree</span> <span class="o">=</span> <span class="n">Tree</span><span class="p">(</span><span class="s2">"S"</span><span class="p">,</span> <span class="p">[])</span>
<span class="k">for</span> <span class="n">child</span> <span class="ow">in</span> <span class="n">tree</span><span class="p">:</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">child</span><span class="p">,</span> <span class="n">Tree</span><span class="p">):</span>
<span class="n">newtree</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">Tree</span><span class="p">(</span><span class="n">child</span><span class="o">.</span><span class="n">label</span><span class="p">(),</span> <span class="p">[]))</span>
<span class="k">for</span> <span class="n">subchild</span> <span class="ow">in</span> <span class="n">child</span><span class="p">:</span>
<span class="n">newtree</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">subchild</span><span class="p">,</span> <span class="nb">next</span><span class="p">(</span><span class="n">tag_iter</span><span class="p">)))</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">newtree</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">child</span><span class="p">,</span> <span class="nb">next</span><span class="p">(</span><span class="n">tag_iter</span><span class="p">)))</span>
<span class="k">return</span> <span class="n">newtree</span></div>
<div class="viewcode-block" id="load_ace_data"><a class="viewcode-back" href="../../../api/nltk.chunk.named_entity.html#nltk.chunk.named_entity.load_ace_data">[docs]</a><span class="k">def</span> <span class="nf">load_ace_data</span><span class="p">(</span><span class="n">roots</span><span class="p">,</span> <span class="n">fmt</span><span class="o">=</span><span class="s2">"binary"</span><span class="p">,</span> <span class="n">skip_bnews</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
<span class="k">for</span> <span class="n">root</span> <span class="ow">in</span> <span class="n">roots</span><span class="p">:</span>
<span class="k">for</span> <span class="n">root</span><span class="p">,</span> <span class="n">dirs</span><span class="p">,</span> <span class="n">files</span> <span class="ow">in</span> <span class="n">os</span><span class="o">.</span><span class="n">walk</span><span class="p">(</span><span class="n">root</span><span class="p">):</span>
<span class="k">if</span> <span class="n">root</span><span class="o">.</span><span class="n">endswith</span><span class="p">(</span><span class="s2">"bnews"</span><span class="p">)</span> <span class="ow">and</span> <span class="n">skip_bnews</span><span class="p">:</span>
<span class="k">continue</span>
<span class="k">for</span> <span class="n">f</span> <span class="ow">in</span> <span class="n">files</span><span class="p">:</span>
<span class="k">if</span> <span class="n">f</span><span class="o">.</span><span class="n">endswith</span><span class="p">(</span><span class="s2">".sgm"</span><span class="p">):</span>
<span class="k">yield from</span> <span class="n">load_ace_file</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">root</span><span class="p">,</span> <span class="n">f</span><span class="p">),</span> <span class="n">fmt</span><span class="p">)</span></div>
<div class="viewcode-block" id="load_ace_file"><a class="viewcode-back" href="../../../api/nltk.chunk.named_entity.html#nltk.chunk.named_entity.load_ace_file">[docs]</a><span class="k">def</span> <span class="nf">load_ace_file</span><span class="p">(</span><span class="n">textfile</span><span class="p">,</span> <span class="n">fmt</span><span class="p">):</span>
<span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s2">" - </span><span class="si">{</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="n">textfile</span><span class="p">)[</span><span class="mi">1</span><span class="p">]</span><span class="si">}</span><span class="s2">"</span><span class="p">)</span>
<span class="n">annfile</span> <span class="o">=</span> <span class="n">textfile</span> <span class="o">+</span> <span class="s2">".tmx.rdc.xml"</span>
<span class="c1"># Read the xml file, and get a list of entities</span>
<span class="n">entities</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">annfile</span><span class="p">)</span> <span class="k">as</span> <span class="n">infile</span><span class="p">:</span>
<span class="n">xml</span> <span class="o">=</span> <span class="n">ET</span><span class="o">.</span><span class="n">parse</span><span class="p">(</span><span class="n">infile</span><span class="p">)</span><span class="o">.</span><span class="n">getroot</span><span class="p">()</span>
<span class="k">for</span> <span class="n">entity</span> <span class="ow">in</span> <span class="n">xml</span><span class="o">.</span><span class="n">findall</span><span class="p">(</span><span class="s2">"document/entity"</span><span class="p">):</span>
<span class="n">typ</span> <span class="o">=</span> <span class="n">entity</span><span class="o">.</span><span class="n">find</span><span class="p">(</span><span class="s2">"entity_type"</span><span class="p">)</span><span class="o">.</span><span class="n">text</span>
<span class="k">for</span> <span class="n">mention</span> <span class="ow">in</span> <span class="n">entity</span><span class="o">.</span><span class="n">findall</span><span class="p">(</span><span class="s2">"entity_mention"</span><span class="p">):</span>
<span class="k">if</span> <span class="n">mention</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"TYPE"</span><span class="p">)</span> <span class="o">!=</span> <span class="s2">"NAME"</span><span class="p">:</span>
<span class="k">continue</span> <span class="c1"># only NEs</span>
<span class="n">s</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">mention</span><span class="o">.</span><span class="n">find</span><span class="p">(</span><span class="s2">"head/charseq/start"</span><span class="p">)</span><span class="o">.</span><span class="n">text</span><span class="p">)</span>
<span class="n">e</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">mention</span><span class="o">.</span><span class="n">find</span><span class="p">(</span><span class="s2">"head/charseq/end"</span><span class="p">)</span><span class="o">.</span><span class="n">text</span><span class="p">)</span> <span class="o">+</span> <span class="mi">1</span>
<span class="n">entities</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">s</span><span class="p">,</span> <span class="n">e</span><span class="p">,</span> <span class="n">typ</span><span class="p">))</span>
<span class="c1"># Read the text file, and mark the entities.</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">textfile</span><span class="p">)</span> <span class="k">as</span> <span class="n">infile</span><span class="p">:</span>
<span class="n">text</span> <span class="o">=</span> <span class="n">infile</span><span class="o">.</span><span class="n">read</span><span class="p">()</span>
<span class="c1"># Strip XML tags, since they don't count towards the indices</span>
<span class="n">text</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">sub</span><span class="p">(</span><span class="s2">"<(?!/?TEXT)[^>]+>"</span><span class="p">,</span> <span class="s2">""</span><span class="p">,</span> <span class="n">text</span><span class="p">)</span>
<span class="c1"># Blank out anything before/after <TEXT></span>
<span class="k">def</span> <span class="nf">subfunc</span><span class="p">(</span><span class="n">m</span><span class="p">):</span>
<span class="k">return</span> <span class="s2">" "</span> <span class="o">*</span> <span class="p">(</span><span class="n">m</span><span class="o">.</span><span class="n">end</span><span class="p">()</span> <span class="o">-</span> <span class="n">m</span><span class="o">.</span><span class="n">start</span><span class="p">()</span> <span class="o">-</span> <span class="mi">6</span><span class="p">)</span>
<span class="n">text</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">sub</span><span class="p">(</span><span class="sa">r</span><span class="s2">"[\s\S]*<TEXT>"</span><span class="p">,</span> <span class="n">subfunc</span><span class="p">,</span> <span class="n">text</span><span class="p">)</span>
<span class="n">text</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">sub</span><span class="p">(</span><span class="sa">r</span><span class="s2">"</TEXT>[\s\S]*"</span><span class="p">,</span> <span class="s2">""</span><span class="p">,</span> <span class="n">text</span><span class="p">)</span>
<span class="c1"># Simplify quotes</span>
<span class="n">text</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">sub</span><span class="p">(</span><span class="s2">"``"</span><span class="p">,</span> <span class="s1">' "'</span><span class="p">,</span> <span class="n">text</span><span class="p">)</span>
<span class="n">text</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">sub</span><span class="p">(</span><span class="s2">"''"</span><span class="p">,</span> <span class="s1">'" '</span><span class="p">,</span> <span class="n">text</span><span class="p">)</span>
<span class="n">entity_types</span> <span class="o">=</span> <span class="p">{</span><span class="n">typ</span> <span class="k">for</span> <span class="p">(</span><span class="n">s</span><span class="p">,</span> <span class="n">e</span><span class="p">,</span> <span class="n">typ</span><span class="p">)</span> <span class="ow">in</span> <span class="n">entities</span><span class="p">}</span>
<span class="c1"># Binary distinction (NE or not NE)</span>
<span class="k">if</span> <span class="n">fmt</span> <span class="o">==</span> <span class="s2">"binary"</span><span class="p">:</span>
<span class="n">i</span> <span class="o">=</span> <span class="mi">0</span>
<span class="n">toks</span> <span class="o">=</span> <span class="n">Tree</span><span class="p">(</span><span class="s2">"S"</span><span class="p">,</span> <span class="p">[])</span>
<span class="k">for</span> <span class="p">(</span><span class="n">s</span><span class="p">,</span> <span class="n">e</span><span class="p">,</span> <span class="n">typ</span><span class="p">)</span> <span class="ow">in</span> <span class="nb">sorted</span><span class="p">(</span><span class="n">entities</span><span class="p">):</span>
<span class="k">if</span> <span class="n">s</span> <span class="o"><</span> <span class="n">i</span><span class="p">:</span>
<span class="n">s</span> <span class="o">=</span> <span class="n">i</span> <span class="c1"># Overlapping! Deal with this better?</span>
<span class="k">if</span> <span class="n">e</span> <span class="o"><=</span> <span class="n">s</span><span class="p">:</span>
<span class="k">continue</span>
<span class="n">toks</span><span class="o">.</span><span class="n">extend</span><span class="p">(</span><span class="n">word_tokenize</span><span class="p">(</span><span class="n">text</span><span class="p">[</span><span class="n">i</span><span class="p">:</span><span class="n">s</span><span class="p">]))</span>
<span class="n">toks</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">Tree</span><span class="p">(</span><span class="s2">"NE"</span><span class="p">,</span> <span class="n">text</span><span class="p">[</span><span class="n">s</span><span class="p">:</span><span class="n">e</span><span class="p">]</span><span class="o">.</span><span class="n">split</span><span class="p">()))</span>
<span class="n">i</span> <span class="o">=</span> <span class="n">e</span>
<span class="n">toks</span><span class="o">.</span><span class="n">extend</span><span class="p">(</span><span class="n">word_tokenize</span><span class="p">(</span><span class="n">text</span><span class="p">[</span><span class="n">i</span><span class="p">:]))</span>
<span class="k">yield</span> <span class="n">toks</span>
<span class="c1"># Multiclass distinction (NE type)</span>
<span class="k">elif</span> <span class="n">fmt</span> <span class="o">==</span> <span class="s2">"multiclass"</span><span class="p">:</span>
<span class="n">i</span> <span class="o">=</span> <span class="mi">0</span>
<span class="n">toks</span> <span class="o">=</span> <span class="n">Tree</span><span class="p">(</span><span class="s2">"S"</span><span class="p">,</span> <span class="p">[])</span>
<span class="k">for</span> <span class="p">(</span><span class="n">s</span><span class="p">,</span> <span class="n">e</span><span class="p">,</span> <span class="n">typ</span><span class="p">)</span> <span class="ow">in</span> <span class="nb">sorted</span><span class="p">(</span><span class="n">entities</span><span class="p">):</span>
<span class="k">if</span> <span class="n">s</span> <span class="o"><</span> <span class="n">i</span><span class="p">:</span>
<span class="n">s</span> <span class="o">=</span> <span class="n">i</span> <span class="c1"># Overlapping! Deal with this better?</span>
<span class="k">if</span> <span class="n">e</span> <span class="o"><=</span> <span class="n">s</span><span class="p">:</span>
<span class="k">continue</span>
<span class="n">toks</span><span class="o">.</span><span class="n">extend</span><span class="p">(</span><span class="n">word_tokenize</span><span class="p">(</span><span class="n">text</span><span class="p">[</span><span class="n">i</span><span class="p">:</span><span class="n">s</span><span class="p">]))</span>
<span class="n">toks</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">Tree</span><span class="p">(</span><span class="n">typ</span><span class="p">,</span> <span class="n">text</span><span class="p">[</span><span class="n">s</span><span class="p">:</span><span class="n">e</span><span class="p">]</span><span class="o">.</span><span class="n">split</span><span class="p">()))</span>
<span class="n">i</span> <span class="o">=</span> <span class="n">e</span>
<span class="n">toks</span><span class="o">.</span><span class="n">extend</span><span class="p">(</span><span class="n">word_tokenize</span><span class="p">(</span><span class="n">text</span><span class="p">[</span><span class="n">i</span><span class="p">:]))</span>
<span class="k">yield</span> <span class="n">toks</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s2">"bad fmt value"</span><span class="p">)</span></div>
<span class="c1"># This probably belongs in a more general-purpose location (as does</span>
<span class="c1"># the parse_to_tagged function).</span>
<div class="viewcode-block" id="cmp_chunks"><a class="viewcode-back" href="../../../api/nltk.chunk.named_entity.html#nltk.chunk.named_entity.cmp_chunks">[docs]</a><span class="k">def</span> <span class="nf">cmp_chunks</span><span class="p">(</span><span class="n">correct</span><span class="p">,</span> <span class="n">guessed</span><span class="p">):</span>
<span class="n">correct</span> <span class="o">=</span> <span class="n">NEChunkParser</span><span class="o">.</span><span class="n">_parse_to_tagged</span><span class="p">(</span><span class="n">correct</span><span class="p">)</span>
<span class="n">guessed</span> <span class="o">=</span> <span class="n">NEChunkParser</span><span class="o">.</span><span class="n">_parse_to_tagged</span><span class="p">(</span><span class="n">guessed</span><span class="p">)</span>
<span class="n">ellipsis</span> <span class="o">=</span> <span class="kc">False</span>
<span class="k">for</span> <span class="p">(</span><span class="n">w</span><span class="p">,</span> <span class="n">ct</span><span class="p">),</span> <span class="p">(</span><span class="n">w</span><span class="p">,</span> <span class="n">gt</span><span class="p">)</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">correct</span><span class="p">,</span> <span class="n">guessed</span><span class="p">):</span>
<span class="k">if</span> <span class="n">ct</span> <span class="o">==</span> <span class="n">gt</span> <span class="o">==</span> <span class="s2">"O"</span><span class="p">:</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">ellipsis</span><span class="p">:</span>
<span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s2">" </span><span class="si">{</span><span class="n">ct</span><span class="si">:</span><span class="s2">15</span><span class="si">}</span><span class="s2"> </span><span class="si">{</span><span class="n">gt</span><span class="si">:</span><span class="s2">15</span><span class="si">}</span><span class="s2"> </span><span class="si">{</span><span class="n">w</span><span class="si">}</span><span class="s2">"</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">" </span><span class="si">{:15}</span><span class="s2"> </span><span class="si">{:15}</span><span class="s2"> </span><span class="si">{2}</span><span class="s2">"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="s2">"..."</span><span class="p">,</span> <span class="s2">"..."</span><span class="p">,</span> <span class="s2">"..."</span><span class="p">))</span>
<span class="n">ellipsis</span> <span class="o">=</span> <span class="kc">True</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">ellipsis</span> <span class="o">=</span> <span class="kc">False</span>
<span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s2">" </span><span class="si">{</span><span class="n">ct</span><span class="si">:</span><span class="s2">15</span><span class="si">}</span><span class="s2"> </span><span class="si">{</span><span class="n">gt</span><span class="si">:</span><span class="s2">15</span><span class="si">}</span><span class="s2"> </span><span class="si">{</span><span class="n">w</span><span class="si">}</span><span class="s2">"</span><span class="p">)</span></div>
<div class="viewcode-block" id="build_model"><a class="viewcode-back" href="../../../api/nltk.chunk.named_entity.html#nltk.chunk.named_entity.build_model">[docs]</a><span class="k">def</span> <span class="nf">build_model</span><span class="p">(</span><span class="n">fmt</span><span class="o">=</span><span class="s2">"binary"</span><span class="p">):</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"Loading training data..."</span><span class="p">)</span>
<span class="n">train_paths</span> <span class="o">=</span> <span class="p">[</span>
<span class="n">find</span><span class="p">(</span><span class="s2">"corpora/ace_data/ace.dev"</span><span class="p">),</span>
<span class="n">find</span><span class="p">(</span><span class="s2">"corpora/ace_data/ace.heldout"</span><span class="p">),</span>
<span class="n">find</span><span class="p">(</span><span class="s2">"corpora/ace_data/bbn.dev"</span><span class="p">),</span>
<span class="n">find</span><span class="p">(</span><span class="s2">"corpora/ace_data/muc.dev"</span><span class="p">),</span>
<span class="p">]</span>
<span class="n">train_trees</span> <span class="o">=</span> <span class="n">load_ace_data</span><span class="p">(</span><span class="n">train_paths</span><span class="p">,</span> <span class="n">fmt</span><span class="p">)</span>
<span class="n">train_data</span> <span class="o">=</span> <span class="p">[</span><span class="n">postag_tree</span><span class="p">(</span><span class="n">t</span><span class="p">)</span> <span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="n">train_trees</span><span class="p">]</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"Training..."</span><span class="p">)</span>
<span class="n">cp</span> <span class="o">=</span> <span class="n">NEChunkParser</span><span class="p">(</span><span class="n">train_data</span><span class="p">)</span>
<span class="k">del</span> <span class="n">train_data</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"Loading eval data..."</span><span class="p">)</span>
<span class="n">eval_paths</span> <span class="o">=</span> <span class="p">[</span><span class="n">find</span><span class="p">(</span><span class="s2">"corpora/ace_data/ace.eval"</span><span class="p">)]</span>
<span class="n">eval_trees</span> <span class="o">=</span> <span class="n">load_ace_data</span><span class="p">(</span><span class="n">eval_paths</span><span class="p">,</span> <span class="n">fmt</span><span class="p">)</span>
<span class="n">eval_data</span> <span class="o">=</span> <span class="p">[</span><span class="n">postag_tree</span><span class="p">(</span><span class="n">t</span><span class="p">)</span> <span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="n">eval_trees</span><span class="p">]</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"Evaluating..."</span><span class="p">)</span>
<span class="n">chunkscore</span> <span class="o">=</span> <span class="n">ChunkScore</span><span class="p">()</span>
<span class="k">for</span> <span class="n">i</span><span class="p">,</span> <span class="n">correct</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="n">eval_data</span><span class="p">):</span>
<span class="n">guess</span> <span class="o">=</span> <span class="n">cp</span><span class="o">.</span><span class="n">parse</span><span class="p">(</span><span class="n">correct</span><span class="o">.</span><span class="n">leaves</span><span class="p">())</span>
<span class="n">chunkscore</span><span class="o">.</span><span class="n">score</span><span class="p">(</span><span class="n">correct</span><span class="p">,</span> <span class="n">guess</span><span class="p">)</span>
<span class="k">if</span> <span class="n">i</span> <span class="o"><</span> <span class="mi">3</span><span class="p">:</span>
<span class="n">cmp_chunks</span><span class="p">(</span><span class="n">correct</span><span class="p">,</span> <span class="n">guess</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="n">chunkscore</span><span class="p">)</span>
<span class="n">outfilename</span> <span class="o">=</span> <span class="sa">f</span><span class="s2">"/tmp/ne_chunker_</span><span class="si">{</span><span class="n">fmt</span><span class="si">}</span><span class="s2">.pickle"</span>
<span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s2">"Saving chunker to </span><span class="si">{</span><span class="n">outfilename</span><span class="si">}</span><span class="s2">..."</span><span class="p">)</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">outfilename</span><span class="p">,</span> <span class="s2">"wb"</span><span class="p">)</span> <span class="k">as</span> <span class="n">outfile</span><span class="p">:</span>
<span class="n">pickle</span><span class="o">.</span><span class="n">dump</span><span class="p">(</span><span class="n">cp</span><span class="p">,</span> <span class="n">outfile</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">)</span>
<span class="k">return</span> <span class="n">cp</span></div>
<span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s2">"__main__"</span><span class="p">:</span>
<span class="c1"># Make sure that the pickled object has the right class name:</span>
<span class="kn">from</span> <span class="nn">nltk.chunk.named_entity</span> <span class="kn">import</span> <span class="n">build_model</span>
<span class="n">build_model</span><span class="p">(</span><span class="s2">"binary"</span><span class="p">)</span>
<span class="n">build_model</span><span class="p">(</span><span class="s2">"multiclass"</span><span class="p">)</span>
</pre></div>
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<a href="https://github.com/nltk/nltk/tree/3.6.5">3.6.5</a>
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Oct 11, 2021
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