.. role:: python(code)
   :language: python

..
    ` <>`  


.. index::
   deep learning; gradient



Examples
--------

R -> R

regression linear function 1:1
(role of hidden layers)

regression  non-linear function 1:1
(role of hidden layers, derivative)

R^2 -> R^2 (vector field)

regression linear function 2:2
(role of hidden layers)

regression  non-linear function 2:2
(role of hidden layers, derivative)

R^2 -> N (multi-class)

multi-class non-linear function 2:2