.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "python/examples/evals_result.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

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

        :ref:`Go to the end <sphx_glr_download_python_examples_evals_result.py>`
        to download the full example code.

.. rst-class:: sphx-glr-example-title

.. _sphx_glr_python_examples_evals_result.py:


This script demonstrate how to access the eval metrics
======================================================

.. GENERATED FROM PYTHON SOURCE LINES 5-44

.. code-block:: Python

    import os

    import xgboost as xgb

    CURRENT_DIR = os.path.dirname(__file__)
    dtrain = xgb.DMatrix(
        os.path.join(CURRENT_DIR, "../data/agaricus.txt.train?format=libsvm")
    )
    dtest = xgb.DMatrix(
        os.path.join(CURRENT_DIR, "../data/agaricus.txt.test?format=libsvm")
    )

    param = [
        ("max_depth", 2),
        ("objective", "binary:logistic"),
        ("eval_metric", "logloss"),
        ("eval_metric", "error"),
    ]

    num_round = 2
    watchlist = [(dtest, "eval"), (dtrain, "train")]

    evals_result = {}
    bst = xgb.train(param, dtrain, num_round, watchlist, evals_result=evals_result)

    print("Access logloss metric directly from evals_result:")
    print(evals_result["eval"]["logloss"])

    print("")
    print("Access metrics through a loop:")
    for e_name, e_mtrs in evals_result.items():
        print("- {}".format(e_name))
        for e_mtr_name, e_mtr_vals in e_mtrs.items():
            print("   - {}".format(e_mtr_name))
            print("      - {}".format(e_mtr_vals))

    print("")
    print("Access complete dictionary:")
    print(evals_result)


.. _sphx_glr_download_python_examples_evals_result.py:

.. only:: html

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

    .. container:: sphx-glr-download sphx-glr-download-jupyter

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

    .. container:: sphx-glr-download sphx-glr-download-python

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

    .. container:: sphx-glr-download sphx-glr-download-zip

      :download:`Download zipped: evals_result.zip <evals_result.zip>`


.. only:: html

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

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