The features (or data describing the features) identified above contain information about the system; however, they need to be transformed in a manner that can be fed into the algorithm in such a way that the output has some physical meaning. The transformation needs to be in such a way that is inspired by the constitution of the problem or the system. There should have some form of generality, and the generality has to come from the nature of the problem. The system we are studying here (PE-brush grafted nanochannel) is an inhomogeneous, but a symmetric system. The system is inhomogeneous in the z-direction because the constitution of the system changes as one goes from the grafting surface to the middle of the nanochannel. At the same time, the system is symmetric (in z) about the of the centerline of the nanochannel. The system also has a symmetry in the x-y direction as well; in other words, for a constant z value, the composition along the x-y directions of the system can be thought of as homogeneous.