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<li><a class="reference internal" href="#">Pipeline Anova SVM</a></li>
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  <div class="section" id="pipeline-anova-svm">
<span id="example-feature-selection-pipeline-py"></span><h1>Pipeline Anova SVM<a class="headerlink" href="#pipeline-anova-svm" title="Permalink to this headline">ΒΆ</a></h1>
<p>Simple usage of Pipeline that runs successively a univariate
feature selection with anova and then a C-SVM of the selected features.</p>
<p><strong>Python source code:</strong> <a class="reference download internal" href="../_downloads/feature_selection_pipeline.py"><tt class="xref download docutils literal"><span class="pre">feature_selection_pipeline.py</span></tt></a></p>
<div class="highlight-python"><div class="highlight"><pre><span class="k">print</span> <span class="n">__doc__</span>

<span class="kn">from</span> <span class="nn">scikits.learn</span> <span class="kn">import</span> <span class="n">svm</span>
<span class="kn">from</span> <span class="nn">scikits.learn.datasets</span> <span class="kn">import</span> <span class="n">samples_generator</span>
<span class="kn">from</span> <span class="nn">scikits.learn.feature_selection</span> <span class="kn">import</span> <span class="n">SelectKBest</span><span class="p">,</span> <span class="n">f_regression</span>
<span class="kn">from</span> <span class="nn">scikits.learn.pipeline</span> <span class="kn">import</span> <span class="n">Pipeline</span>

<span class="c"># import some data to play with</span>
<span class="n">X</span><span class="p">,</span> <span class="n">y</span> <span class="o">=</span> <span class="n">samples_generator</span><span class="o">.</span><span class="n">test_dataset_classif</span><span class="p">(</span><span class="n">k</span><span class="o">=</span><span class="mi">5</span><span class="p">)</span>

<span class="c"># ANOVA SVM-C</span>
<span class="c"># 1) anova filter, take 5 best ranked features</span>
<span class="n">anova_filter</span> <span class="o">=</span> <span class="n">SelectKBest</span><span class="p">(</span><span class="n">f_regression</span><span class="p">,</span> <span class="n">k</span><span class="o">=</span><span class="mi">5</span><span class="p">)</span>
<span class="c"># 2) svm</span>
<span class="n">clf</span> <span class="o">=</span> <span class="n">svm</span><span class="o">.</span><span class="n">SVC</span><span class="p">(</span><span class="n">kernel</span><span class="o">=</span><span class="s">&#39;linear&#39;</span><span class="p">)</span>

<span class="n">anova_svm</span> <span class="o">=</span> <span class="n">Pipeline</span><span class="p">([(</span><span class="s">&#39;anova&#39;</span><span class="p">,</span> <span class="n">anova_filter</span><span class="p">),</span> <span class="p">(</span><span class="s">&#39;svm&#39;</span><span class="p">,</span> <span class="n">clf</span><span class="p">)])</span>
<span class="n">anova_svm</span><span class="o">.</span><span class="n">fit</span><span class="p">(</span><span class="n">X</span><span class="p">,</span> <span class="n">y</span><span class="p">)</span>
<span class="n">anova_svm</span><span class="o">.</span><span class="n">predict</span><span class="p">(</span><span class="n">X</span><span class="p">)</span>
</pre></div>
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