Rank1 support

[rprimet]

Very rough draft of part 1 of the implementation of #46 for discussion / comments.

[codecov[bot]]

Codecov Report

Merging #48 (bb23361) into main (ad30e87) will increase coverage by 1.29%. The diff coverage is 97.46%.

@@            Coverage Diff             @@
##             main      #48      +/-   ##
==========================================
+ Coverage   74.50%   75.80%   +1.29%     
==========================================
  Files          43       43              
  Lines        2593     2748     +155     
==========================================
+ Hits         1932     2083     +151     
- Misses        661      665       +4     

Flag	Coverage Δ
unittests	75.80% <97.46%> (+1.29%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
dicodile/update_z/distributed_sparse_encoder.py	74.25% <71.42%> (-2.34%)	:arrow_down:
dicodile/update_z/coordinate_descent.py	41.17% <80.00%> (-0.63%)	:arrow_down:
dicodile/update_z/dicod.py	78.68% <100.00%> (+0.84%)	:arrow_up:
.../update_z/tests/test_distributed_sparse_encoder.py	100.00% <100.00%> (ø)
dicodile/utils/csc.py	100.00% <100.00%> (ø)
dicodile/utils/dictionary.py	51.45% <100.00%> (+19.02%)	:arrow_up:
dicodile/utils/tests/test_csc.py	100.00% <100.00%> (ø)
dicodile/workers/dicod_worker.py	94.14% <100.00%> (+0.06%)	:arrow_up:

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[tomMoral]

The example is nice and working! LGTM! thanks @rprimet

[agramfort]

🙏 @rprimet !