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zfit / zfit-development

The developement repository for zfit with roadmaps, internal docs etc to clean up the issues
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enh: failure of hessian with singular matrix #70

Open jonas-eschle opened 3 years ago

jonas-eschle commented 3 years ago

Hesse can fail (minuit silent, numpy with SingularMatrixError) if a parameter has no derivative, e.g. a tail that wend outside of the datapoints.

We should catch this with an error message and maybe even (for numpy) point to the failing one