def MeSigmaDeriv(self, u): 
        return self.mesh.getEdgeInnerProductDeriv(self.curModel.sigma)(u) * self.curModel.sigmaDeriv
Derivative of MeSigma with respect to the model
dataset/ETHPy150Open simpeg/simpeg/SimPEG/EM/Base.py/BaseEMProblem.MeSigmaDeriv