human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "optimal point placement for mesh smoothing"
  Abstract: We study the problem of moving a vertex in an unstructured mesh of triangular, quadrilateral, or tetrahedral elements to optimize the shapes of adjacent elements. We show that many such problems can be solved in linear time using generalized linear programming. We also give efficient algorithms for some mesh smooth ing problems that do not fit into the generalized linear programming paradigm.

Connected through hyperedge HE-1 (induced by source paper "consensus maximization tree search revisited"):
  with members:
    - "robust fitting in computer vision easy or hard"
    - "deterministic consensus maximization with biconvex programming"
    - "maximum consensus parameter estimation by reweighted ell_1 methods"

Connected through hyperedge HE-2 (induced by source paper "diamond kite adaptive quadrilateral meshing"):
  with members:
    - "planar lombardi drawings for subcubic graphs"
    - "the graphs of planar soap bubbles"
    - "well centered triangulation"
    - "algorithms for coloring quadtrees"
    - "quadrilateral meshing by circle packing"

Connected through hyperedge HE-3 (induced by source paper "how to place a point to maximize angles"):
  with members:
    - "sharp bounds on davenport schinzel sequences of every order"

Connected through hyperedge HE-4 (induced by source paper "efficient and global optimization based smoothing methods for mixed volume meshes"):
  with members:
    - "the modified direct method an iterative approach for smoothing planar meshes"

Connected through hyperedge HE-5 (induced by source paper "angle optimization of graphs embedded in the plane"):
  with members:
    - "drawing trees with perfect angular resolution and polynomial area"
    - "lombardi drawings of graphs"
    - "maximizing the total resolution of graphs"
    - "optimal angular resolution for face symmetric drawings"
    - "trees with convex faces and optimal angles"

Connected through hyperedge HE-6 (induced by source paper "moving walkways escalators and elevators"):
  with members:
    - "constructing optimal highways"
    - "minimum dilation stars"

Connected through hyperedge HE-7 (induced by source paper "spacetime meshing for discontinuous galerkin methods"):
  with members:
    - "efficient spacetime meshing with nonlocal cone constraints"
    - "building space time meshes over arbitrary spatial domains"

Connected through hyperedge HE-8 (induced by source paper "quasiconvex analysis of backtracking algorithms"):
  with members:
    - "the traveling salesman problem for cubic graphs"
    - "confluent drawings visualizing non planar diagrams in a planar way"
    - "optimized color gamuts for tiled displays"
    - "improved algorithms for 3 coloring 3 edge coloring and constraint satisfaction"
    - "small maximal independent sets and faster exact graph coloring"

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.CG(Computational Geometry)