Function solve 

pub fn solve<F: Function>(
    eqs: &[F],
    vars: &HashMap<Var, Parameter>,
) -> Result<HashMap<Var, f32>, Error>

Least-squares minimization on a set of functions

Returns a map from free variable to its final value

Minimization is accomplished using a relatively basic implementation of the Levenberg-Marquardt algorithm.

References

• The Levenberg-Marquardt Algorithm (Ranganathan 2004)
• Basics on Continuous Optimization § Levenberg-Marquardt
• Improvements to the Levenberg-Marquardt algorithm for nonlinear least-squares minimization (Transtrum 2012)