solver pyomo nonlinear-optimization mixed-integer-programming

Why a NonNegativeIntegers variable gets a float value in Baron solver

I am using pyomo and Baron to solve a MINLP. I declared a NonNegativeIntegers variable but when Baron solves the problem, the variable is: 2e-06 !!

How is it possible?!

Solution

Because of tolerances any integer variable can be slightly non-integer. This is normal and also happens with linear solvers.

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