3 research outputs found
Exploring Graph Classification Techniques Under Low Data Constraints: A Comprehensive Study
This survey paper presents a brief overview of recent research on graph data
augmentation and few-shot learning. It covers various techniques for graph data
augmentation, including node and edge perturbation, graph coarsening, and graph
generation, as well as the latest developments in few-shot learning, such as
meta-learning and model-agnostic meta-learning. The paper explores these areas
in depth and delves into further sub classifications. Rule based approaches and
learning based approaches are surveyed under graph augmentation techniques.
Few-Shot Learning on graphs is also studied in terms of metric learning
techniques and optimization-based techniques. In all, this paper provides an
extensive array of techniques that can be employed in solving graph processing
problems faced in low-data scenarios
QDC: Quantum Diffusion Convolution Kernels on Graphs
Graph convolutional neural networks (GCNs) operate by aggregating messages
over local neighborhoods given the prediction task under interest. Many GCNs
can be understood as a form of generalized diffusion of input features on the
graph, and significant work has been dedicated to improving predictive accuracy
by altering the ways of message passing. In this work, we propose a new
convolution kernel that effectively rewires the graph according to the
occupation correlations of the vertices by trading on the generalized diffusion
paradigm for the propagation of a quantum particle over the graph. We term this
new convolution kernel the Quantum Diffusion Convolution (QDC) operator. In
addition, we introduce a multiscale variant that combines messages from the QDC
operator and the traditional combinatorial Laplacian. To understand our method,
we explore the spectral dependence of homophily and the importance of quantum
dynamics in the construction of a bandpass filter. Through these studies, as
well as experiments on a range of datasets, we observe that QDC improves
predictive performance on the widely used benchmark datasets when compared to
similar methods
Generalized heat kernel signatures
In this work we propose a generalization of the Heat Kernel Signature (HKS). The HKS is a point signature derived from
the heat kernel of the Laplace-Beltrami operator of a surface. In the theory of exterior calculus on a Riemannian manifold,
the Laplace-Beltrami operator of a surface is a special case of the Hodge Laplacian which acts on r-forms, i. e. the Hodge
Laplacian on 0-forms (functions) is the Laplace-Beltrami operator. We investigate the usefulness of the heat kernel of the
Hodge Laplacian on 1-forms (which can be seen as the vector Laplacian) to derive new point signatures which are invariant
under isometric mappings. A similar approach used to obtain the HKS yields a symmetric tensor field of second order; for
easier comparability we consider several scalar tensor invariants. Computed examples show that these new point signatures are
especially interesting for surfaces with boundary