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paq8l Documentation

20070308-3

open source file compressor and archiverPaq8l is one of a series of open source data compression archivers that have evolved through collaborative development to top rankings on several benchmarks measuring compression ratio (although at the expense of speed and memory usage). The paq compressors use context mixing: a large number of models estimate the probability that the next bit of data will be a 0 or 1. These predictions are combined and arithmetic coded (similar to PPM). In paq6, predictions are combined by weighted averaging, then adjusting the weights to favor the most accurate models. Paq7 and later differ mainly in that model predictions are combined using a neural network rather than by weighted averaging.
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