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: "boundary first flattening"
  Abstract: A conformal flattening maps a curved surface to the plane without distorting angles—such maps have become a fundamental building block for problems in geometry processing, numerical simulation, and computational design. Yet existing methods provide little direct control over the shape of the flattened domain, or else demand expensive nonlinear optimization. Boundary first flattening (BFF) is a linear method for conformal parameterization that is faster than traditional linear methods, yet provides control and quality comparable to sophisticated nonlinear schemes. The key insight is that the boundary data for many conformal mapping problems can be efficiently constructed via the Cherrier formula together with a pair of Poincare-Steklov operators; once the boundary is known, the map can be easily extended over the rest of the domain. Since computation demands only a single factorization of the real Laplace matrix, the amortized cost is about 50× less than any previously published technique for boundary-controlled conformal flattening. As a result, BFF opens the door to real-time editing or fast optimization of high-resolution maps, with direct control over boundary length or angle. We show how this method can be used to construct maps with sharp corners, cone singularities, minimal area distortion, and uniformization over the unit disk; we also demonstrate for the first time how a surface can be conformally flattened directly onto any given target shape.

Connected through hyperedge HE-1 (induced by source paper "shape analysis via inconsistent surface registration"):
  with members:
    - "tooth morphometry using quasi conformal theory"
    - "inconsistent surface registration via optimization of mapping distortions"
    - "parallelizable global conformal parameterization of simply connected surfaces via partial welding"
    - "density equalizing maps for simply connected open surfaces"
    - "a novel stretch energy minimization algorithm for equiareal parameterizations"
    - "fast spherical quasiconformal parameterization of genus 0 closed surfaces with application to adaptive remeshing"
    - "tempo feature endowed teichm uller extremal mappings of point clouds"
    - "a linear formulation for disk conformal parameterization of simply connected open surfaces"

Connected through hyperedge HE-2 (induced by source paper "parallelizable global conformal parameterization of simply connected surfaces via partial welding"):
  with members:
    - "tooth morphometry using quasi conformal theory"
    - "area preserving mapping of 3d ultrasound carotid artery images using density equalizing reference map"
    - "density equalizing maps for simply connected open surfaces"
    - "a novel stretch energy minimization algorithm for equiareal parameterizations"
    - "fast spherical quasiconformal parameterization of genus 0 closed surfaces with application to adaptive remeshing"
    - "tempo feature endowed teichm uller extremal mappings of point clouds"
    - "sparsified cholesky and multigrid solvers for connection laplacians"
    - "a linear formulation for disk conformal parameterization of simply connected open surfaces"

Connected through hyperedge HE-3 (induced by source paper "steklov spectral geometry for extrinsic shape analysis"):
  with members:
    - "on the optimality of shape and data representation in the spectral domain"
    - "geodesics in heat a new approach to computing distance based on heat flow"
    - "biomolecular electrostatics using a fast multipole bem on up to 512 gpus and a billion unknowns"

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.GR(Graphics)