Zihe Zhou

Zihe Zhou (周子贺)

Researcher in graph-structured learning & overlapping community detection · PhD applicant, Fall 2027

I build fast, scalable algorithms and systems for graphs. My flagship work, Highway, detects overlapping communities in networks up to 1.13 million nodes using sparse backbones — and is now integrated into cdlib, a mainstream community-detection library.

I'm currently finishing my MEng at the University of Toronto and applying to CS/EECS PhD programs for Fall 2027. I'm drawn to research where algorithmic ideas meet real-world scale — and increasingly to bringing graph structure into how models represent and control meaning.

News

Publications

Highway

Overlapping Network Community Detection Using Sparse Backbones

Zihe Zhou, Samin Aref

ASONAM 2026 (Springer proceedings) · Accepted · journal extension in preparation (SNAM)

A four-step sparse-backbone method. Evaluated on ~3,000 synthetic graphs and three real SNAP networks (up to 1.13M nodes / 2.99M edges); the only method to finish all three within 300s (7.34× faster on the largest instance).

Triad

Triad: Suppressing Structural Degeneracy in Overlapping Community Detection

Zihe Zhou, Samin Aref

WAW 2026 · Presentation (not a proceedings paper)

A QCP formulation with node/edge/community constraints that explicitly suppresses structural degeneracy — the predecessor method that led to Highway.

Research & Projects

Highway OCD Benchmark ↗

An open, reproducible benchmark for overlapping community detection — plug in your own algorithm and compare against Highway plus eight cdlib baselines on five metrics. Requested by the WAW program chair.

DSEG — Dynamic Semantic Evolution Graph

An exploratory direction carrying overlapping-community ideas into how models represent meaning: a graph-structured, interpretable semantic-control layer. My proposed future research direction.

HELM

A full-stack system that grew out of a finance-ML course project — a six-layer data platform with governed data spine and multiple clients. Evidence of engineering maturity rather than a research thrust.

Background

University of Toronto — MEng, Mechanical & Industrial Engineering (Data Analytics & ML), 2025–2026.

University of Waterloo — B.C.S. Honours with Distinction; CS major, AI specialization, Computational Math minor, 2020–2025.