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<li><a class="reference internal" href="#"><code class="xref py py-mod docutils literal notranslate"><span class="pre">sklearn.base</span></code>.RegressorMixin</a></li>
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<div class="section" id="sklearn-base-regressormixin">
<h1><a class="reference internal" href="../classes.html#module-sklearn.base" title="sklearn.base"><code class="xref py py-mod docutils literal notranslate"><span class="pre">sklearn.base</span></code></a>.RegressorMixin<a class="headerlink" href="#sklearn-base-regressormixin" title="Permalink to this headline">¶</a></h1>
<dl class="py class">
<dt id="sklearn.base.RegressorMixin">
<em class="property">class </em><code class="sig-prename descclassname">sklearn.base.</code><code class="sig-name descname">RegressorMixin</code><a class="reference external" href="https://github.com/scikit-learn/scikit-learn/blob/23d876161/sklearn/base.py#L506"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#sklearn.base.RegressorMixin" title="Permalink to this definition">¶</a></dt>
<dd><p>Mixin class for all regression estimators in scikit-learn.</p>
<p class="rubric">Methods</p>
<table class="longtable docutils align-default">
<colgroup>
<col style="width: 10%" />
<col style="width: 90%" />
</colgroup>
<tbody>
<tr class="row-odd"><td><p><a class="reference internal" href="#sklearn.base.RegressorMixin.score" title="sklearn.base.RegressorMixin.score"><code class="xref py py-obj docutils literal notranslate"><span class="pre">score</span></code></a>(X, y[, sample_weight])</p></td>
<td><p>Return the coefficient of determination <span class="math notranslate nohighlight">\(R^2\)</span> of the prediction.</p></td>
</tr>
</tbody>
</table>
<dl class="py method">
<dt id="sklearn.base.RegressorMixin.score">
<code class="sig-name descname">score</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">X</span></em>, <em class="sig-param"><span class="n">y</span></em>, <em class="sig-param"><span class="n">sample_weight</span><span class="o">=</span><span class="default_value">None</span></em><span class="sig-paren">)</span><a class="reference external" href="https://github.com/scikit-learn/scikit-learn/blob/23d876161/sklearn/base.py#L510"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#sklearn.base.RegressorMixin.score" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the coefficient of determination <span class="math notranslate nohighlight">\(R^2\)</span> of the
prediction.</p>
<p>The coefficient <span class="math notranslate nohighlight">\(R^2\)</span> is defined as <span class="math notranslate nohighlight">\((1 - \frac{u}{v})\)</span>,
where <span class="math notranslate nohighlight">\(u\)</span> is the residual sum of squares <code class="docutils literal notranslate"><span class="pre">((y_true</span> <span class="pre">-</span> <span class="pre">y_pred)</span>
<span class="pre">**</span> <span class="pre">2).sum()</span></code> and <span class="math notranslate nohighlight">\(v\)</span> is the total sum of squares <code class="docutils literal notranslate"><span class="pre">((y_true</span> <span class="pre">-</span>
<span class="pre">y_true.mean())</span> <span class="pre">**</span> <span class="pre">2).sum()</span></code>. The best possible score is 1.0 and it
can be negative (because the model can be arbitrarily worse). A
constant model that always predicts the expected value of <code class="docutils literal notranslate"><span class="pre">y</span></code>,
disregarding the input features, would get a <span class="math notranslate nohighlight">\(R^2\)</span> score of
0.0.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><dl class="simple">
<dt><strong>X</strong><span class="classifier">array-like of shape (n_samples, n_features)</span></dt><dd><p>Test samples. For some estimators this may be a precomputed
kernel matrix or a list of generic objects instead with shape
<code class="docutils literal notranslate"><span class="pre">(n_samples,</span> <span class="pre">n_samples_fitted)</span></code>, where <code class="docutils literal notranslate"><span class="pre">n_samples_fitted</span></code>
is the number of samples used in the fitting for the estimator.</p>
</dd>
<dt><strong>y</strong><span class="classifier">array-like of shape (n_samples,) or (n_samples, n_outputs)</span></dt><dd><p>True values for <code class="docutils literal notranslate"><span class="pre">X</span></code>.</p>
</dd>
<dt><strong>sample_weight</strong><span class="classifier">array-like of shape (n_samples,), default=None</span></dt><dd><p>Sample weights.</p>
</dd>
</dl>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><dl class="simple">
<dt><strong>score</strong><span class="classifier">float</span></dt><dd><p><span class="math notranslate nohighlight">\(R^2\)</span> of <code class="docutils literal notranslate"><span class="pre">self.predict(X)</span></code> wrt. <code class="docutils literal notranslate"><span class="pre">y</span></code>.</p>
</dd>
</dl>
</dd>
</dl>
<p class="rubric">Notes</p>
<p>The <span class="math notranslate nohighlight">\(R^2\)</span> score used when calling <code class="docutils literal notranslate"><span class="pre">score</span></code> on a regressor uses
<code class="docutils literal notranslate"><span class="pre">multioutput='uniform_average'</span></code> from version 0.23 to keep consistent
with default value of <a class="reference internal" href="sklearn.metrics.r2_score.html#sklearn.metrics.r2_score" title="sklearn.metrics.r2_score"><code class="xref py py-func docutils literal notranslate"><span class="pre">r2_score</span></code></a>.
This influences the <code class="docutils literal notranslate"><span class="pre">score</span></code> method of all the multioutput
regressors (except for
<a class="reference internal" href="sklearn.multioutput.MultiOutputRegressor.html#sklearn.multioutput.MultiOutputRegressor" title="sklearn.multioutput.MultiOutputRegressor"><code class="xref py py-class docutils literal notranslate"><span class="pre">MultiOutputRegressor</span></code></a>).</p>
</dd></dl>
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