why are layer parameters added for multilayer perceptron example at deeplearning.net
<p>For the multilayer perceptron example at</p>

<p>[<a href="http://www.deeplearning.net/tutorial/mlp.html#mlp][1]" rel="nofollow">http://www.deeplearning.net/tutorial/mlp.html#mlp][1]</a></p>

<p>why are the params (weights &amp; biases) added.  See the fifth code section in the above page.</p>