first pass implement ML/target blending

[miketynes]

There may be a cleaner way. And not sure if we should work into tests.

[WardLT]

Oh, and please fix Flake8. I'd like for the tests to pass on main

[coveralls]

Pull Request Test Coverage Report for Build 10309034696

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

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Details

• 21 of 21 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 94.986%

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Totals
Change from base Build 10250584329:	0.1%
Covered Lines:	663
Relevant Lines:	698

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💛 - Coveralls