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paq8l Documentation


open source file compressor and archiver
Paq8l 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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