The output is arithmetic coded. The programs take no options. The algorithm is described in M. Described in an unpublished report, M. It is described in M. Technical Report CS, The most significant improvements are replacing the fixed model weights with adaptive linear mixing Matt Mahoneyand SSE secondary symbol estimation postprocessing on the output probability, and modeling of sparse contexts Serge Osnach.
Other models were added for x86 executable code, and automatic detection of fixed length records in binary data. Intermediate versions can be found here.
A Scott arithmetic coder optimizationsJason Schmidt model improvementsand Johan de Bock compiler optimizations. WRT is described in P. There were a great number of versions by many contributors, mostly in when the PAQ series moved to the top of most compression benchmarks and attracted interest.
Prior to PAQ, the top ranked programs were generally closed source. The important improvements were replacing the adaptive linear mixing of models with a neural network coded in MMX assemblera more memory-efficient mapping of contexts to bit histories using a cache-aligned hash table, adaptive mapping of bit histories to probabilities, and models for bmp, tiff, and jpeg images.
It models text using whole-word contexts and case folding, like all versions back to p12, but lacks WRT text preprocessing. It served as a baseline for the Hutter prize. Details are in the source code comments. It was top ranked on enwik9 but not enwik8 when the Hutter prize was launched on Aug.
This is the 78'th version since p5.
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It adds a NestModel to model nesting of parenthesis and brackets. The test below for -7 is based on a Windows compile, raq8g. The test for -8 was under Linux.
The unzipped Linux executable is 27, bytes. It is a general purpose compressor like paq8f, not specialized for text. Time reported is wall time. It adds a DMC model and minor improvements.
It is otherwise archive compatible with paq8f for data without JPEG images such as enwik8 and enwik9. There are two executables that produce identical archives. The current version is paq8o ver. The benchmark is based on the first version. Text compression is unchanged from paq8l, paq8m, paq8o, or paq8o2.
Text compression is unaffected. It is archive compatible with v1. The improved compression of enwik8 comes from this StateMap.1 2. 2 0 4.
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