pyro-ppl / pyro-ppl/numpyro

Non-bijective deterministic objective

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Description

Hi, I have been using numpyro for my research and have been finding it very useful!

I had a quick question which isn't clear to me from the documentation. Is there a way to have an observation I want to condition on be the result of a non-bijective deterministic function? I saw in this issue #932 that this can be done using the TransformedDistribution API with a bijective transform. Is this not possible with a non-bijective transform?

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First steps

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Research direction

Start by reviewing issue #932 and the TransformedDistribution API referenced in the report, then trace how NumPyro handles deterministic observations. Establish whether non-bijective transforms are supported and define the expected behavior and coverage needed for a complete solution.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
machine-learning
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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