[MRG] Batch/Lazy Log Sinkhorn Knopp on samples

[6Ulm]

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Motivation and context / Related issue

How has this been tested (if it applies)

Checklist

• The documentation is up-to-date with the changes I made.
• I have read the CONTRIBUTING document.
• All tests passed, and additional code has been covered with new tests.

[codecov]

Codecov Report

Merging #259 (28dd2fe) into master (982510e) will increase coverage by 0.02%.
The diff coverage is 95.83%.

@@            Coverage Diff             @@
##           master     #259      +/-   ##
==========================================
+ Coverage   93.07%   93.09%   +0.02%     
==========================================
  Files          17       17              
  Lines        3450     3506      +56     
==========================================
+ Hits         3211     3264      +53     
- Misses        239      242       +3