pyro-ppl / pyro-ppl/numpyro

numpyro.render_model render unexpected graph with handler.do

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Description

Similar to #1710.
The reproduced code is as follows.

import numpyro
import numpyro.distributions as dist

from numpyro.handlers import do

def model(y=None):
    alpha = numpyro.sample("alpha", dist.Normal(0., 1.))
    beta = numpyro.sample("beta", dist.Normal(alpha, 1.))
    gamma = numpyro.sample("gamma", dist.HalfNormal(beta))

    return gamma
    
intervention = {
    "beta": 0.,
}
model_intervention = do(model, intervention)

numpyro.render_model(model_intervention)

This code render the graph below.
model_intervention

But expected is the edge between alpha and beta is cut and the edge between beta and gamma exists.
model_inervention_expected

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Research direction

Start by running the reproduced Python snippet with numpyro.render_model and handlers.do, then compare its graph with the expected image and the related behavior in #1710. Done means the intervention graph cuts the alpha-to-beta edge while retaining the beta-to-gamma edge.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
machine-learning
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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