Frequently Asked Questions

[junpenglao]

This comes up a couple time:

How to do sample_ppc after fitting the model that contains pm.Minibatch?

Answer: you cannot do that directly. But there is a workaround.

Evaluating minibatch trained model on test set

see the comment by @ferrine in this issue. Copied below: To sample ppc after minibatch inference is the following: Initialize model with shared data, not minibatch. Create minibatches for inference using pm.Minibatch Use more_replacements argument in fit like approx = pm.fit(more_replacements={full_x: minibatch_x, full_y:minibatch_y}, ...) After that you can get trace from approximation and pass it to sample_ppc. Note that it will perform ppc for examples you defined in step 1, not miniba…