Struct PatchGrammarPrior 

pub struct PatchGrammarPrior {
    pub source_prob: f64,
    pub max_depth: usize,
    pub max_mod_depth: usize,
    pub source_weights: [f64; 7],
    pub op_weights: [f64; 20],
    pub mod_weights: [f64; 8],
}

The typed PCFG over patch terms.

Fields

source_prob: f64

Probability that a node (below max depth) is a source leaf.

max_depth: usize

Maximum tree depth; nodes at this depth are forced to be sources.

max_mod_depth: usize

Maximum nesting depth of a modulation term: a term at this depth is forced to be a leaf, exactly as Self::max_depth forces #leaf.

This is the mod sort’s only parsimony pressure. The audio tree pays for its own size in prior mass because every extra node is another #leaf/#op draw; a modulation chain pays the same way, but nothing about the audio term’s mass objects to a forty-node CV chain that moves one knob, so the ceiling has to be explicit. 2 means a term may wrap at most two processors before it bottoms out in a leaf.

source_weights: [f64; 7]

Weights over source kinds [Vco, Supersaw, Noise, Wavetable, Pluck, Formant, Silence].

op_weights: [f64; 20]

Weights over processor kinds [Mix, Filter, Fold, Delay, Chorus, Reverb, Distortion, Bitcrush, Phaser, RingMod, Flanger, Tremolo, Vibrato, Eq, Granular, Shift, Comp, Duck, Gate, Vocoder].

mod_weights: [f64; 8]

Weights over modulation kinds [None, Lfo, Env, Rand, Follow, Euclid, Op, Pair].

Implementations

impl PatchGrammarPrior

pub fn sample_with_rng<R: Rng>(&self, rng: &mut R) -> PatchTree

Draw a tree with a plain RNG (no trace) — the classic-layer sampler mirroring Self::model. Used by EvolutionaryGenome::generate.

Trait Implementations

impl Clone for PatchGrammarPrior

fn clone(&self) -> PatchGrammarPrior

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PatchGrammarPrior

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

Formats the value using the given formatter.

impl Default for PatchGrammarPrior

fn default() -> Self

Returns the “default value” for a type.

impl GenomePrior for PatchGrammarPrior

type Genome = PatchTree

The genome type this prior generates.

fn model(&self) -> Model<PatchTree>

The generative program p(x).

fn trace_of(&self, genome: &Self::Genome) -> Trace

Encode a genome as a trace under this prior’s address scheme — the inverse direction of running [Self::model]. The default delegates to the genome’s canonical [TraceGenome::to_trace] encoding, which is correct whenever the prior samples exactly the canonical sites (all the vector priors here). Priors with their own generative scheme — e.g. ArithmeticGrammarPrior’s tree-path grammar — override this so that scoring, weighted traces, and chain warm-starts work for any genome the prior can express.