.. note::
    :class: sphx-glr-download-link-note

    Click :ref:`here <sphx_glr_download_auto_examples_weisfeiler_lehman_subtree.py>` to download the full example code
.. rst-class:: sphx-glr-example-title

.. _sphx_glr_auto_examples_weisfeiler_lehman_subtree.py:


=========================================================================
Graph classification on MUTAG using the Weisfeiler-Lehman subtree kernel.
=========================================================================

Script makes use of :class:`grakel.WeisfeilerLehman`, :class:`grakel.VertexHistogram`


.. code-block:: default

    from __future__ import print_function
    print(__doc__)

    import numpy as np

    from sklearn.model_selection import train_test_split
    from sklearn.svm import SVC
    from sklearn.metrics import accuracy_score

    from grakel.datasets import fetch_dataset
    from grakel.kernels import WeisfeilerLehman, VertexHistogram

    # Loads the MUTAG dataset
    MUTAG = fetch_dataset("MUTAG", verbose=False)
    G, y = MUTAG.data, MUTAG.target

    # Splits the dataset into a training and a test set
    G_train, G_test, y_train, y_test = train_test_split(G, y, test_size=0.1, random_state=42)

    # Uses the Weisfeiler-Lehman subtree kernel to generate the kernel matrices
    gk = WeisfeilerLehman(n_iter=4, base_kernel=VertexHistogram, normalize=True)
    K_train = gk.fit_transform(G_train)
    K_test = gk.transform(G_test)

    # Uses the SVM classifier to perform classification
    clf = SVC(kernel="precomputed")
    clf.fit(K_train, y_train)
    y_pred = clf.predict(K_test)

    # Computes and prints the classification accuracy
    acc = accuracy_score(y_test, y_pred)
    print("Accuracy:", str(round(acc*100, 2)) + "%")


.. rst-class:: sphx-glr-timing

   **Total running time of the script:** ( 0 minutes  0.000 seconds)


.. _sphx_glr_download_auto_examples_weisfeiler_lehman_subtree.py:


.. only :: html

 .. container:: sphx-glr-footer
    :class: sphx-glr-footer-example



  .. container:: sphx-glr-download

     :download:`Download Python source code: weisfeiler_lehman_subtree.py <weisfeiler_lehman_subtree.py>`



  .. container:: sphx-glr-download

     :download:`Download Jupyter notebook: weisfeiler_lehman_subtree.ipynb <weisfeiler_lehman_subtree.ipynb>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_