flatten_params          Flattens the network parameters so they can be
                        passed to [minipack.lm::nls.lm] 'par' argument
nnetLM                  Initalize the neural network object
predict.nnetLM          Performs a forward pass
residFun                Residual function needed by
                        [minipack.lm::nls.lm]
train.nnetLM            Train the neural network with
                        Levenberg-Marquardt optimization using
                        [minipack.lm::nls.lm]
unflatten_params        Unflattens the network parameters after they
                        have been used by [minipack.lm::nls.lm]
