Expose epsilon parameter (precision) through python layer

[ChuckHastings]

Completes the work of exposing the precision parameter to the caller in python as requested by #1645

Fixes a few PR comments from PR #1673 that were deferred as that PR required merging to fix the build.

[codecov-commenter]

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[seunghwak]

Looks good to me.

[BradReesWork]

@gpucibot merge