[Neuroimaging] positivity constraint in mapmri crashes

Rutger Fick fick.rutger at gmail.com
Tue Jul 10 11:42:39 EDT 2018

Hi Tugan,

This actually has to do with upgrading to the latest version of cvxpy. It
has to do with the following line:


In an older version of the maprmi code this was a 'strict inequality' as in
only a '>' sign, but cvxpy now now only accepts larger or equal than '>='.

Updating dipy to the latest version should fix this line to what it should


On 9 July 2018 at 18:29, Muftuler, L. Tugan <lmuftuler at mcw.edu> wrote:

> Hi,
> I am running mapmri on ex-vivo brain data. When I choose "positivity
> constraint" i get a cvxpy error :
> File "/data/data/Anaconda/lib/python2.7/site-packages/cvxpy/expressions/expression.py",
> line 502, in __gt__
>     raise NotImplementedError("Strict inequalities are not allowed.")
> NotImplementedError: Strict inequalities are not allowed.
> I updated cvxpy to the latest, but it still fails. Did anyone else
> encounter this? I would be grateful if anyone could offer a solution.
> best,
> -tugan
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