I am running a model using ordinal data. I want different thresholds across countries and different discriminations across items. The data includes 12591 cases and 13 items. After 5 iterations, the model is still running, but not producing any output.

The syntax is below. What is wrong? Many thanks!!!

```
control <- list(adapt_delta=0.99,max_treedepth=20)
###########the same discrimination across the countries and different thresholds
formula_va_ord_2pl <- bf(
response ~ 1 + age + int1_sex + (cs(countrycode)|i|item) + (1 | id_insci),
disc ~ 0 + (1|i|item))
get_prior(formula = bf(response ~ 1 + age + int1_sex + (cs(countrycode)|i|item) + (1 | id_insci),
disc ~ 0 + (1|i|item)),
brmsfamily(family="acat",link = "logit"),
data=data_training)
prior_va_ord_2pl <-
prior("normal(0, sqrt(10))", class = "b") +
prior("normal(0, sqrt(10))", class = "Intercept",) +
prior("student_t(3, 0, 2)", class = "sd") +
prior("student_t(3, 0, 2)", class = "sd", group = "item") +
prior("student_t(3, 0, 2)", class = "sd", group = "item", dpar = "disc")+
prior("student_t(3, 0, 2)", class = "sd", dpar = "disc")
# fit the model
fit_va_ord_2pl<- brm(
formula = formula_va_ord_2pl,
chains = 1, iter = 100, warmup = 20,
control = control,
data = data_training,
family = brmsfamily("acat", "logit",threshold = c("flexible")),
prior = prior_va_ord_2pl,
seed = 1234,
inits=0
)
```