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CountMinSketch

oxirs_stream::advanced_sampling

Struct CountMinSketch 

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pub struct CountMinSketch { /* private fields */ }
Expand description

Count-Min Sketch - Approximate frequency counter

Space-efficient probabilistic data structure for estimating frequency of elements in a stream with guaranteed error bounds.

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impl CountMinSketch

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pub fn new(hash_count: usize, width: usize) -> Self

Create a new Count-Min Sketch

§Arguments
  • hash_count - Number of hash functions (depth)
  • width - Number of counters per hash function

Error bounds: ε = e / width, δ = 1 / e^hash_count

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pub fn add<T: Hash>(&mut self, element: &T, count: u64)

Add an element with count

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pub fn estimate<T: Hash>(&self, element: &T) -> u64

Estimate the frequency of an element

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pub fn total_count(&self) -> u64

Get the total count of all elements

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pub fn stats(&self) -> CountMinSketchStats

Get statistics about the Count-Min Sketch

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impl Clone for CountMinSketch

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fn clone(&self) -> CountMinSketch

Returns a duplicate of the value. Read more
1.0.0 · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for CountMinSketch

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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