ELBO in SVI tutorial part one

Shouldn’t the ELBO be written as a function of x in the tutorial?
i.e. ELBO(x)

it’s common to suppress dependence on things where the context makes that dependence reasonably obvious. technically the elbo depends on x, the parameters of the model theta, and the parameters of the guide phi. you could indicate all that explicitly but it would make the notation (unnecessarily) clunky