optimflex: Derivative-Based Optimization with User-Defined Convergence
Criteria
Provides a derivative-based optimization framework that allows users
to combine eight convergence criteria. Unlike standard optimization functions, this package includes a
built-in mechanism to verify the positive definiteness of the Hessian matrix
at the point of convergence. This additional check helps prevent the solver
from falsely identifying non-optimal solutions, such as saddle points, as
valid minima.
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