Draft:Pcodec

Submission declined on 6 April 2025 by Sophisticatedevening (talk).

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Declined by Sophisticatedevening 41 days ago. Last edited by Scenichill 40 days ago. Reviewer: Inform author.

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Pcodec or Pco is a lossless compression format and algorithm for numerical data. Its is open sourced under Apache 2.0 License. Its stated goal is to compress with high compression ratio and moderately fast speed. ^[1]

Pco differs from LZ77 and LZ78 compression in that it applies "binning" to numerical values instead of matching exact sequences of bytes. These bins are then entropy coded. ^[1]

Pco is the remake of an earlier codec named Quantile Compression or q_compress. Work on q_compress began in mid 2021, and Pco's first stable version was released in November 2023. ^[2] ^[3] Pco is used in other wrapping data formats such as Zarr. ^[4]

References

^ ^a ^b "pcodec/pcodec: Lossless codec for numerical data". github.com. Retrieved 2025-04-06.
^ "basic algorithm - mwlon/pcodec". github.com. 2021-05-31. Retrieved 2025-04-06.
^ "crates.io: Rust Package Registry". crates.io. 2023-11-28. Retrieved 2025-04-06.
^ "API reference - numcodecs 0.15.1 documentation". readthedocs.io. Retrieved 2025-04-06.

[github-1] "pcodec/pcodec: Lossless codec for numerical data". github.com. Retrieved 2025-04-06.

[2] "basic algorithm - mwlon/pcodec". github.com. 2021-05-31. Retrieved 2025-04-06.

[3] "crates.io: Rust Package Registry". crates.io. 2023-11-28. Retrieved 2025-04-06.

[4] "API reference - numcodecs 0.15.1 documentation". readthedocs.io. Retrieved 2025-04-06.

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