28 lines
731 B
Markdown
28 lines
731 B
Markdown
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---
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title: "Reservoir Sampling"
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date: 2024-08-02T18:30:56+01:00
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draft: false # I don't care for draft mode, git has branches for that
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description: "Elegantly sampling a stream"
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tags:
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- algorithms
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- python
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categories:
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- programming
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series:
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- Cool algorithms
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favorite: false
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disable_feed: false
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mathjax: true
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---
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[_Reservoir Sampling_][reservoir] is an [online][online], probabilistic
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algorithm to uniformly sample $k$ random elements out of a stream of values.
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It's a particularly elegant and small algorithm, only requiring $\Theta(k)$
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amount of space and a single pass through the stream.
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[reservoir]: https://en.wikipedia.org/wiki/Reservoir_sampling
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[online]: https://en.wikipedia.org/wiki/Online_algorithm
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