Fix a Gibbs bug with models where linking changes variable dimension #2472
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Codecov ReportAll modified and coverable lines are covered by tests ✅
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## master #2472 +/- ##
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Coverage 84.45% 84.45%
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Files 21 21
Lines 1570 1570
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Hits 1326 1326
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I'll update the compat bound for DynamicPPL once the release is out, and add the new test that prevents regression. |
penelopeysm
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Jan 23, 2025
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Currently this PR only adds a test, the actual fix is to be implemented. The test reproduces the issue encountered in TuringLang/docs#579.
I think the fix is to just remove this assertion in DPPL: https://github.com/TuringLang/DynamicPPL.jl/blob/938a69dfabb7089f52700ef01fa3a9f2d667b7d1/src/varinfo.jl#L532
I don't see a reason why, when merging two
VarInfos, all the variables should have the same dimension in both VIs being merged. However, due to Chesterton's fence I'm uncomfortable making that change before I've understood why the assertion is there in the first place.