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<a accesskey="3" href="page.php?w=backpropagation&amp;p=2">3.Next</a>
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<p>In <a href="page.php?w=machine_learning">machine learning</a>, <b>backpropagation</b> is a <a href="page.php?w=gradient">gradient</a> computation method commonly used for training a <a href="page.php?w=Neural_network_%28machine_learning%29">neural network</a> in computing parameter updates.</p>

<p>It is an efficient application of the <a href="page.php?w=chain_rule">chain rule</a> to neural networks. Backpropagation efficiently computes the gradient of the loss with respect to the network weights for a single input-output example. It does this</p><p>
<a accesskey="3" href="page.php?w=backpropagation&amp;p=2">3.Next</a>
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