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<!-- Classification -->
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<h2 >
:ref:`Classification <supervised-learning>`
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<blockquote>
<p>Identifying to which category an object belongs to.</p>
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<strong>Applications</strong>: Spam detection, Image recognition.</br>
<strong>Algorithms</strong>:
:ref:`SVM<svm>`, :ref:`nearest neighbors<classification>`, :ref:`random forest<forest>`, ...
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:ref:`Examples<general_examples>`
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<h2>
:ref:`Regression <supervised-learning>`
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<p>Predicting a continuous-valued attribute associated with an object.</p>
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<strong>Applications</strong>: Drug response, Stock prices.</br>
<strong>Algorithms</strong>:
:ref:`SVR<svm>`, :ref:`ridge regression<ridge_regression>`, :ref:`Lasso<lasso>`, ...
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<h2>
:ref:`Clustering<clustering>`
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<blockquote>
<p>Automatic grouping of similar objects into sets.</p>
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<strong>Applications</strong>: Customer segmentation, Grouping experiment outcomes</br>
<strong>Algorithms</strong>:
:ref:`k-Means<k_means>`, :ref:`spectral clustering<spectral_clustering>`, :ref:`mean-shift<mean_shift>`, ...
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:ref:`Examples<cluster_examples>`
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:ref:`Dimensionality reduction<decompositions>`
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<blockquote>
<p>Reducing the number of random variables to consider.</p>
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<strong>Applications</strong>: Visualization, Increased efficiency</br>
<strong>Algorithms</strong>:
:ref:`PCA<PCA>`, :ref:`feature selection<feature_selection>`, :ref:`non-negative matrix factorization<NMF>`.
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:ref:`Examples<decomposition_examples>`
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:ref:`Model selection<model_selection>`
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<p>Comparing, validating and choosing parameters and models.</p>
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<strong>Goal</strong>: Improved accuracy via parameter tuning</br>
<strong>Modules</strong>:
:ref:`grid search<grid_search>`, :ref:`cross validation<cross_validation>`, :ref:`metrics<model_evaluation>`.
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:ref:`Examples<general_examples>`
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<h2>
:ref:`Preprocessing<preprocessing>`
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<p>Feature extraction and normalization.</p>
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<strong>Application</strong>: Transforming input data such as text for use with machine learning algorithms.</br>
<strong>Modules</strong>:
:ref:`preprocessing<preprocessing>`, :ref:`feature extraction<feature_extraction>`.
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:ref:`Examples<general_examples>`
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.. toctree::
:maxdepth: 2
:hidden:
preface
tutorial/index
user_guide
glossary
auto_examples/index
modules/classes
developers/index