(July 8, 2026 16:45) IMI Colloquium in July 2026
The lecturer in the colloquium in July is Andre Fujita-sensei.
Participation is open to students and faculty members at JGMI.
We kindly ask all participants to register in advance for the IMI Colloquium, even if attending in person.
Please register using the form below. -> Registration Form
| Date & Time | Wednesday, 8 July 2026 16:45-17:45 |
| Place | IMI Auditorium (W1-D-413) and Live streaming with Zoom |
| Speaker | Andre Fujita (Division of Network AI Statistics – Medical Institute of Bioregulation – Kyushu University) |
| Title | Nonparametric inference for network generative mechanisms via graph spectra |
| Abstract | Complex systems are composed of many interacting components whose collective behavior often cannot be inferred from the properties of individual parts. Such systems arise across biology, sociology, economics, and technology and are naturally represented as networks that encode interactions among their components. Traditional approaches model these networks as random graphs and compare them using graph-level features such as edge counts, motifs, and centrality measures. However, these features are often incidental and do not directly capture the underlying generative mechanisms that define the systems of interest. I will present a nonparametric statistical framework for inference on unobserved network generation mechanisms using graph spectra, the eigenvalues of graph adjacency matrices. Because graph spectra are closely linked to both network structure and generative processes, they provide a principled basis for parameter estimation, model selection, graph comparison, correlation analysis, Granger causality for time-series graphs, clustering, and extensions to hypergraphs. The proposed methods are illustrated through applications. |
・The account name should be “Full name” in case of the faculty members, or “Student ID number (Last name)” (e.g.：1SC○○○○○A (Last name) in case of students.
・Please understand the host will mute the audience’s sound and camera.
・When you have a question, please use the “Raise hand function” or the “Chat function”. Then, the host will unmute.
IKEMATSU, Yasuhiko <ikematsu@imi.kyushu-u.ac.jp>
KURATA, Sumito <kurata@imi.kyushu-u.ac.jp>
TAGAMI, Daisuke <tagami@imi.kyushu-u.ac.jp>