Use reservoir sampling for impostors to save memory#5

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gerner wants to merge 7 commits intojohny-c:masterfrom gerner:online_sample_impostors

Commits on Feb 3, 2021

use reservoir sampling for impostors to save memory
gerner
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Commits on Feb 8, 2021

CR feedback about naming and breaking out reservoir sampling as optional
gerner
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Commits on Feb 9, 2021

cleaning up _find_impostors_blockwise by making uniform and reservoir sampling polymorphic
gerner
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Commits on Feb 10, 2021

fix docstring typos/formatting
gerner
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Commits on Feb 11, 2021

moving ReservoirSampler and UniformSampler to their own file
gerner
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Commits on Mar 27, 2021