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    :ref:`Classification <supervised-learning>`

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        <p>Identifying to which category an object belongs to.</p>
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        <strong>Algorithms</strong>:&nbsp;

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    :ref:`Clustering<clustering>`

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    :ref:`Dimensionality reduction<decompositions>`

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        <strong>Applications</strong>: Visualization, Increased efficiency</br>
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    :ref:`PCA<PCA>`, :ref:`feature selection<feature_selection>`, :ref:`non-negative matrix factorization<NMF>`.

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    :ref:`Model selection<model_selection>`

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    :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>:&nbsp;

    :ref:`preprocessing<preprocessing>`, :ref:`feature extraction<feature_extraction>`.

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.. Define an order for the Table of Contents:

.. toctree::
    :maxdepth: 2
    :hidden:

    preface
    tutorial/index
    user_guide
    glossary
    auto_examples/index
    modules/classes
    developers/index
