Fix compute_on_cpu arg + forward method

[SkafteNicki]

What does this PR do?

Fixes #1323

Before submitting

• Was this discussed/approved via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in Github issues there's a high chance it will not be merged.

Did you have fun?

Make sure you had fun coding 🙃

[codecov]

Codecov Report

Merging #1333 (a98af3b) into master (3636182) will decrease coverage by 0%.
The diff coverage is 75%.

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #1333   +/-   ##
======================================
- Coverage      87%     87%   -0%     
======================================
  Files         200     200           
  Lines       11472   11476    +4     
======================================
+ Hits         9957    9960    +3     
- Misses       1515    1516    +1     

[jpcbertoldo]

Thanks @SkafteNicki!

[SkafteNicki]

@jpcbertoldo thanks for reporting such issues :]