Function sample 

pub fn sample<T>(
    addr: Address,
    dist: impl Distribution<T> + 'static,
) -> Model<T>
where
    T: SampleType,

Sample from a distribution (generic version - chooses the right variant automatically).

Type-specific variants:

• sample_f64 - Sample from f64 distributions (continuous distributions)
• sample_bool - Sample from bool distributions (Bernoulli)
• sample_u64 - Sample from u64 distributions (Poisson, Binomial)
• sample_usize - Sample from usize distributions (Categorical)

Example:

// Automatically returns f64 for continuous distributions
let normal_sample: Model<f64> = sample(addr!("x"), Normal::new(0.0, 1.0).unwrap());
// Automatically returns bool for Bernoulli
let coin_flip: Model<bool> = sample(addr!("coin"), Bernoulli::new(0.5).unwrap());
// Automatically returns u64 for Poisson
let count: Model<u64> = sample(addr!("count"), Poisson::new(3.0).unwrap());
// Automatically returns usize for Categorical
let choice: Model<usize> = sample(addr!("choice"),
    Categorical::new(vec![0.3, 0.5, 0.2]).unwrap());