[Ipopt] run time constraint violation

[Ming Ji]

I am trying to solve a NLP problem with IPOPT. I noticed that constraints
can be violated during the optimization. I need to take sqrt to estimate
one term in my target function. So it is natural to add a constraint to
make sure the sqrt calculation is always valid. However, during the
iterations, IPOPT use some trial parameters that violate this constraint.
The optimization almost always terminates before it finds any solution. Any
work around for this?
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