Struct rv::dist::Crp

pub struct Crp {
    pub alpha: f64,
    pub n: usize,
}

Chinese Restaurant Process

Example

extern crate rand;

use::rv::prelude::*;

let mut rng = rand::thread_rng();

let crp = Crp::new(1.0, 10).expect("Invalid parameters");
let partition = crp.draw(&mut rng);

assert_eq!(partition.len(), 10);

Fields

alpha: f64

Discount parameter

n: usize

number of items in the partition

Methods

impl Crp

pub fn new(alpha: f64, n: usize) -> Result<Self>

Create an empty Crp with parameter alpha

Trait Implementations

impl Debug for Crp

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

Formats the value using the given formatter.

impl Clone for Crp

fn clone(&self) -> Crp

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Rv<Partition> for Crp

fn ln_f(&self, x: &Partition) -> f64

Un-normalized probability function

fn ln_normalizer(&self) -> f64

The log of the constant term in the PDF/PMF. Should not be a function of any of the parameters.

fn draw<R: Rng>(&self, rng: &mut R) -> Partition

Single draw from the Rv

fn f(&self, x: &X) -> f64

Un-normalized probability function

fn normalizer(&self) -> f64

The constant term in the PDF/PMF. Should not be a function of any of the parameters.

fn sample<R: Rng>(&self, n: usize, rng: &mut R) -> Vec<X>

Multiple draws of the Rv

impl Support<Partition> for Crp

fn contains(&self, _x: &Partition) -> bool

Returns true if x is in the support of the Rv