py-why / py-why/EconML

SparseLinearDML and DML with Debaised Lasso output only NaNs

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Description

With identical data, when I use DML with WeightedMultiTaskLassoCV as the final model, the output is fine (not necessarily accurate, I just mean they are numbers) whereas when I use SparseLinearDML or DML with MultiOutputDebiasedLasso, the outputs from the final model are all NaNs. The residuals appear fine however

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Research direction

Reproduce the issue with SparseLinearDML, DML using MultiOutputDebiasedLasso, and the working WeightedMultiTaskLassoCV comparison on identical data. Trace the final-model output path while checking the residuals, and consider the issue resolved when the affected models return numeric outputs rather than NaNs.

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Assessment

Tech stack
python
Domain
machine-learning
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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