.. _sphx_glr_api_gallery_optimization_conjugate_gradient:

Nonlinear conjugate gradient
------------------------------

Fletcher-Reeves and Polak-Ribiere nonlinear CG.


.. raw:: html

  <div id='sg-tag-list' class='sphx-glr-tag-list'></div>


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    <div class="sphx-glr-thumbnails">

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    <div class="sphx-glr-thumbcontainer" tooltip="Compares Polak-Ribiere nonlinear CG against plain gradient descent on the same ill-conditioned quadratic bowl -- CG&#x27;s conjugate search directions avoid the zig-zagging that slows gradient descent down.">

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  .. image:: /api/gallery/optimization/conjugate_gradient/images/thumb/sphx_glr_plot_01_cg_vs_gradient_descent_thumb.png
    :alt:

  :doc:`/api/gallery/optimization/conjugate_gradient/plot_01_cg_vs_gradient_descent`

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      <div class="sphx-glr-thumbnail-title">Nonlinear conjugate gradient vs. gradient descent</div>
    </div>


.. thumbnail-parent-div-close

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    </div>


.. toctree::
   :hidden:

   /api/gallery/optimization/conjugate_gradient/plot_01_cg_vs_gradient_descent