[WIP] BSP-OT: Sparse transport plans between discrete measures in loglinear time

[dcoeurjo]

Initial fork and PR. (wip)

Types of changes

Original paper

Motivation and context / Related issue

How has this been tested (if it applies)

PR checklist

• I have read the CONTRIBUTING document.
• The documentation is up-to-date with the changes I made (check build artifacts).
• All tests passed, and additional code has been covered with new tests.
• I have added the PR and Issue fix to the RELEASES.md file.

[codecov]

Codecov Report

❌ Patch coverage is 95.65217% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.87%. Comparing base (41a4d57) to head (cc80e72).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #768   +/-   ##
=======================================
  Coverage   96.87%   96.87%           
=======================================
  Files         113      116    +3     
  Lines       23062    23130   +68     
=======================================
+ Hits        22342    22408   +66     
- Misses        720      722    +2     

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