Fix device for minibatch OT and test out of space

[rflamary]

Types of changes

Fixes PR #783 and the error when testing with all dependencies.

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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.07%. Comparing base (9412193) to head (1ca7292).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #784   +/-   ##
=======================================
  Coverage   97.07%   97.07%           
=======================================
  Files         107      107           
  Lines       22138    22138           
=======================================
  Hits        21490    21490           
  Misses        648      648           

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