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TopKCompressor

scirs2_core::distributed::compression

Struct TopKCompressor 

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

Top-K gradient sparsification compressor.

Keeps the k = ceil(n * k_fraction) elements with the largest absolute value. Optionally accumulates the discarded residual for the next round (error feedback).

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impl TopKCompressor

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pub fn new(n_params: usize, config: TopKConfig) -> Self

Create a new compressor for gradients of length n_params.

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pub fn compress( &mut self, gradient: &[f64], ) -> CoreResult<(Vec<usize>, Vec<f64>)>

Compress a gradient vector.

Returns (indices, values) of the top-k elements by absolute value. If error feedback is enabled the residual from the previous round is added to gradient before selecting the top-k elements, and the new residual is stored internally.

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pub fn decompress( indices: &[usize], values: &[f64], n_total: usize, ) -> CoreResult<Vec<f64>>

Decompress a sparse gradient back to a dense vector.

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pub fn compression_ratio(&self, n_total: usize) -> f64

Compression ratio: n_total / k.

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