There is no function to validate a metamodel from L2 norm

[mbaudin47]

Here is one draft class from Anne Dutfoy.

class MetamodelValidation:
    def __init__(self, modele, metamodele, loi):
        self.modele = modele
        self.metamodele = metamodele
        self.loi = loi

    def computeIntegrand(self, x):
        return [
            (self.modele(x)[0] - self.metamodele(x)[0]) ** 2 * self.loi.computePDF(x)
        ]

    def computeL2Norm(self):
        integrandFunction = ot.PythonFunction(1, 1, self.computeIntegrand)
        return ot.GaussKronrod().integrate(integrandFunction, self.loi.getRange())[0]