Blurb::
Normalize by sample mean of gradient norms
Description::
For each reponse function :math:`f_i` , normalize its gradient data by
the mean :math:`m_i`  of the gradient two-norms taken across samples :math:`j=1,...,J` :


.. math::  m_i = \frac{1}{J} \sum_{j=1}^{J}{\| \nabla^j f_i \|_2} 

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