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<div class="section" id="roget">
<span id="graph-roget"></span><h1>Roget<a class="headerlink" href="#roget" title="Permalink to this headline">ΒΆ</a></h1>
<p>[<a class="reference external" href="../../_static/examples/roget.py">source code</a>]</p>
<div class="highlight-python"><div class="highlight"><pre><span class="c">#!/usr/bin/env python</span>
<span class="sd">"""</span>
<span class="sd">Build a directed graph of 1022 categories and</span>
<span class="sd">5075 cross-references as defined in the 1879 version of Roget's Thesaurus</span>
<span class="sd">contained in the datafile roget_dat.txt. This example is described in</span>
<span class="sd">Section 1.2 in Knuth's book [1,2].</span>
<span class="sd">Note that one of the 5075 cross references is a self loop yet</span>
<span class="sd">it is included in the graph built here because</span>
<span class="sd">the standard networkx DiGraph class allows self loops.</span>
<span class="sd">(cf. 400pungency:400 401 403 405).</span>
<span class="sd">References.</span>
<span class="sd">----------</span>
<span class="sd">[1] Donald E. Knuth,</span>
<span class="sd"> "The Stanford GraphBase: A Platform for Combinatorial Computing",</span>
<span class="sd"> ACM Press, New York, 1993.</span>
<span class="sd">[2] http://www-cs-faculty.stanford.edu/~knuth/sgb.html</span>
<span class="sd">"""</span>
<span class="kn">from</span> <span class="nn">__future__</span> <span class="kn">import</span> <span class="n">print_function</span>
<span class="n">__author__</span> <span class="o">=</span> <span class="s">"""Brendt Wohlberg</span><span class="se">\n</span><span class="s">Aric Hagberg (hagberg@lanl.gov)"""</span>
<span class="n">__date__</span> <span class="o">=</span> <span class="s">"$Date: 2005-04-01 07:56:22 -0700 (Fri, 01 Apr 2005) $"</span>
<span class="n">__credits__</span> <span class="o">=</span> <span class="s">""""""</span>
<span class="n">__revision__</span> <span class="o">=</span> <span class="s">""</span>
<span class="c"># Copyright (C) 2004 by</span>
<span class="c"># Aric Hagberg <hagberg@lanl.gov></span>
<span class="c"># Dan Schult <dschult@colgate.edu></span>
<span class="c"># Pieter Swart <swart@lanl.gov></span>
<span class="c"># All rights reserved.</span>
<span class="c"># BSD license.</span>
<span class="kn">from</span> <span class="nn">networkx</span> <span class="kn">import</span> <span class="o">*</span>
<span class="kn">import</span> <span class="nn">re</span>
<span class="kn">import</span> <span class="nn">sys</span>
<span class="k">def</span> <span class="nf">roget_graph</span><span class="p">():</span>
<span class="sd">""" Return the thesaurus graph from the roget.dat example in</span>
<span class="sd"> the Stanford Graph Base.</span>
<span class="sd"> """</span>
<span class="c"># open file roget_dat.txt.gz (or roget_dat.txt)</span>
<span class="kn">import</span> <span class="nn">gzip</span>
<span class="n">fh</span><span class="o">=</span><span class="n">gzip</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="s">'roget_dat.txt.gz'</span><span class="p">,</span><span class="s">'r'</span><span class="p">)</span>
<span class="n">G</span><span class="o">=</span><span class="n">DiGraph</span><span class="p">()</span>
<span class="k">for</span> <span class="n">line</span> <span class="ow">in</span> <span class="n">fh</span><span class="o">.</span><span class="n">readlines</span><span class="p">():</span>
<span class="n">line</span> <span class="o">=</span> <span class="n">line</span><span class="o">.</span><span class="n">decode</span><span class="p">()</span>
<span class="k">if</span> <span class="n">line</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s">"*"</span><span class="p">):</span> <span class="c"># skip comments</span>
<span class="k">continue</span>
<span class="k">if</span> <span class="n">line</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s">" "</span><span class="p">):</span> <span class="c"># this is a continuation line, append</span>
<span class="n">line</span><span class="o">=</span><span class="n">oldline</span><span class="o">+</span><span class="n">line</span>
<span class="k">if</span> <span class="n">line</span><span class="o">.</span><span class="n">endswith</span><span class="p">(</span><span class="s">"</span><span class="se">\\\n</span><span class="s">"</span><span class="p">):</span> <span class="c"># continuation line, buffer, goto next</span>
<span class="n">oldline</span><span class="o">=</span><span class="n">line</span><span class="o">.</span><span class="n">strip</span><span class="p">(</span><span class="s">"</span><span class="se">\\\n</span><span class="s">"</span><span class="p">)</span>
<span class="k">continue</span>
<span class="p">(</span><span class="n">headname</span><span class="p">,</span><span class="n">tails</span><span class="p">)</span><span class="o">=</span><span class="n">line</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s">":"</span><span class="p">)</span>
<span class="c"># head</span>
<span class="n">numfind</span><span class="o">=</span><span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span><span class="s">"^\d+"</span><span class="p">)</span> <span class="c"># re to find the number of this word</span>
<span class="n">head</span><span class="o">=</span><span class="n">numfind</span><span class="o">.</span><span class="n">findall</span><span class="p">(</span><span class="n">headname</span><span class="p">)[</span><span class="mi">0</span><span class="p">]</span> <span class="c"># get the number</span>
<span class="n">G</span><span class="o">.</span><span class="n">add_node</span><span class="p">(</span><span class="n">head</span><span class="p">)</span>
<span class="k">for</span> <span class="n">tail</span> <span class="ow">in</span> <span class="n">tails</span><span class="o">.</span><span class="n">split</span><span class="p">():</span>
<span class="k">if</span> <span class="n">head</span><span class="o">==</span><span class="n">tail</span><span class="p">:</span>
<span class="k">print</span><span class="p">(</span><span class="s">"skipping self loop"</span><span class="p">,</span><span class="n">head</span><span class="p">,</span><span class="n">tail</span><span class="p">,</span> <span class="nb">file</span><span class="o">=</span><span class="n">sys</span><span class="o">.</span><span class="n">stderr</span><span class="p">)</span>
<span class="n">G</span><span class="o">.</span><span class="n">add_edge</span><span class="p">(</span><span class="n">head</span><span class="p">,</span><span class="n">tail</span><span class="p">)</span>
<span class="k">return</span> <span class="n">G</span>
<span class="k">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">'__main__'</span><span class="p">:</span>
<span class="kn">from</span> <span class="nn">networkx</span> <span class="kn">import</span> <span class="o">*</span>
<span class="n">G</span><span class="o">=</span><span class="n">roget_graph</span><span class="p">()</span>
<span class="k">print</span><span class="p">(</span><span class="s">"Loaded roget_dat.txt containing 1022 categories."</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">"digraph has </span><span class="si">%d</span><span class="s"> nodes with </span><span class="si">%d</span><span class="s"> edges"</span>\
<span class="o">%</span><span class="p">(</span><span class="n">number_of_nodes</span><span class="p">(</span><span class="n">G</span><span class="p">),</span><span class="n">number_of_edges</span><span class="p">(</span><span class="n">G</span><span class="p">)))</span>
<span class="n">UG</span><span class="o">=</span><span class="n">G</span><span class="o">.</span><span class="n">to_undirected</span><span class="p">()</span>
<span class="k">print</span><span class="p">(</span><span class="n">number_connected_components</span><span class="p">(</span><span class="n">UG</span><span class="p">),</span><span class="s">"connected components"</span><span class="p">)</span>
</pre></div>
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