Update sampling primitive again, fix hypersparse computations

[ChuckHastings]

@jnke2016 found a few more issues.

This update changes the hyper sparse computation, passes more of the MG tests.

[jnke2016]

I tested this PR and it looks good to me

[ChuckHastings]

rerun tests

[codecov-commenter]

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[ChuckHastings]

@gpucibot merge