Class MEAL::ChainRule
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template<class T>
class ChainRule : public T Parameterizes a Function by one or more Scalar ordinates.
Given any Function, \( M({\bf a}) \), one or more parameters may be constrained by a Scalar, \( f({\bf b}) \). That is, \(a_i=f({\bf b})\). The fit flag for \(a_i\) is set to false, and the partial derivatives of \( M \) with respect to the Scalar parameters, \(\bf b\), are given by the chain rule, \({\partial M\over\partial b_k} = {\partial M\over\partial a_i}{\partial f\over\partial b_k}\).