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BytePrefixMass

infotheory::api

Struct BytePrefixMass 

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

Live byte-prefix state used to query a 256-way byte PDF as conditional bits.

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impl BytePrefixMass

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pub fn from_pdf(pdf: &[f64], order: BitOrder) -> Self

Build a prefix-mass state from a byte PDF.

Slices shorter than 256 are treated as zero-padded on the right (i.e. missing entries contribute 0 mass). This is an explicit construction-time contract for the public API (graceful handling of partial rows); see also the private from_raw_weights and module-level docs on legitimate uniform fallbacks.

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pub fn from_log_probs(log_probs: &[f64], order: BitOrder) -> Self

Build a prefix-mass state from byte log-probabilities or log-weights.

Finite entries are exponentiated after subtracting the maximum finite entry for numerical stability. Non-finite entries are treated as zero mass, and an all-invalid row therefore falls back to the same uniform distribution as Self::from_pdf.

The input slice is truncated to at most 256 entries (excess ignored); shorter slices are zero-padded (explicit contract, see Self::from_pdf).

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pub fn from_cdf(cdf: [f64; 257], order: BitOrder) -> Self

Build a prefix-mass state from a normalized byte CDF row.

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pub fn prediction(&self) -> BinaryPrediction

Query the current conditional probability of the next bit.

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pub fn observe(&mut self, bit: bool)

Observe a bit, discarding the impossible sibling branch.

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pub fn is_complete(&self) -> bool

Whether a full byte has been observed.

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pub fn has_partial_bits(&self) -> bool

Whether the current byte prefix has consumed at least one bit but has not completed a full byte yet.

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pub fn symbol(&self) -> u8

Current completed symbol. Meaningful once Self::is_complete is true.

Trait Implementations§

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impl Clone for BytePrefixMass

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fn clone(&self) -> BytePrefixMass

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for BytePrefixMass

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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