# Fminlbfgs Details

### From Ufldl

The function `fminlbfgs` gives a BSD license implementation of L-BFGS (so appropriate use of this in commercial applications is okay). Here, we describe some details.

You can download the source code, or read a description of the software on the Mathworks website.

It has an interface that is very similar to minFunc, and only very minor changes are required to get it to work.

Specifically, the "`options`" variable needs to be specified differently (`fminlbfgs` uses different names for the parameters). Here's a parameter set that will work for `fminlbfgs`:

    options.HessUpdate = 'lbfgs';
    options.MaxIter = 400;
    options.Display = 'iter';
    options.GradObj = 'on';

After setting `options` as above, the function call to run minFunc/fminlbfgs is exactly the same. Here's an example that works:

    %  Run fminlbfgs
    [opttheta, loss] = fminlbfgs( @(p) sparseAutoencoderLoss(p, ...
                                       visibleSize, hiddenSize, ...
                                       lambda, targetActivation, ...
                                       beta, patches), ...
                                  theta, options);

Retrieved from "http://deeplearning.stanford.edu/wiki/index.php/Fminlbfgs_Details"

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