greta models are written right in R, so there's no need to learn another language like BUGS or Stan


greta uses Google TensorFlow so it's fast even on massive datasets, and runs on CPU clusters and GPUs


it's easy to write your own R functions and packages using greta

example models
package docs

Here’s a Bayesian linear regression model for the iris data using greta:

x <- iris$Petal.Length
y <- iris$Sepal.Length
int <- normal(0, 5)
coef <- normal(0, 3)
sd <- lognormal(0, 3)
mean <- int + coef * x
distribution(y) <- normal(mean, sd)
m <- model(int, coef, sd)
draws <- mcmc(m, n_samples = 1000, chains = 4)