Distributions

List some distribution types.

bernoulli
multinomial
gaussian
poisson
gamma
tweedie
laplace
quantile
huber

References:
https://en.wikipedia.org/wiki/Probability_distribution
https://en.wikipedia.org/wiki/Multinomial_distribution
https://en.wikipedia.org/wiki/Bernoulli_distribution
https://en.wikipedia.org/wiki/Quantile_function