Added the restriction on Factorised masks to be positive using absolute value (as in ecker 2018)

[pollytur]

#218

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 7.52%. Comparing base (49a7310) to head (15baed4).

Files	Patch %	Lines
neuralpredictors/layers/readouts/factorized.py	0.00%	7 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main    #232      +/-   ##
========================================
- Coverage   7.53%   7.52%   -0.01%     
========================================
  Files         58      58              
  Lines       5959    5965       +6     
  Branches    1011    1013       +2     
========================================
  Hits         449     449              
- Misses      5473    5479       +6     
  Partials      37      37              

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