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Colby Ham

dblp:270/8717 · DBLP profile ↗
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2ranked-venue papers
0as first author
2since 2021 · last 2021
—ORCID · unresolved

Domains — the database's venue-derived domains; a paper can count in several

Applied, interdisciplinary, general and emerging computing · 2 · 2 since 2021Databases, data management, data science and information retrieval · 1 · 1 since 2021

Expertise — from the expertise taxonomy: the topics of the expert's papers under the CCF categories. A weight counts papers with recency: 1 for a paper about the topic, 0.3 when the topic is its context, halved every five years.

Artificial intelligence
1 paper
Graph learning · 100%
Databases, data mining, and information retrieval
1 paper
Web and social media mining · 100%

Topics — the 4 heaviest of 4, each with the papers that count most for it

TopicWeightPapersLastEvidence papers
Machine learning › Graph learning
graph self-supervised learning
0.512021
Self-Supervised Learning of Contextual Embeddings for Link Prediction in Heterogeneous Networks · WWW 2021
Machine learning › Graph learning › network embedding
heterogeneous graph embedding
0.512021
Self-Supervised Learning of Contextual Embeddings for Link Prediction in Heterogeneous Networks · WWW 2021
Machine learning › Graph learning
link prediction
0.512021
Self-Supervised Learning of Contextual Embeddings for Link Prediction in Heterogeneous Networks · WWW 2021
Web and social media mining › web mining
web graph analysis
0.112021
Self-Supervised Learning of Contextual Embeddings for Link Prediction in Heterogeneous Networks · WWW 2021

Methods — techniques the papers use, named apart from their topics

self-supervised pretraining · 1.0meta-path aggregation · 1.0attention mechanism · 1.0
YearPublicationVenuePosition
2021 Tracking the Evolution of COVID-19 via Temporal Comorbidity Analysis from Multi-Modal Data
Sutanay Choudhury, Khushbu Agarwal, Colby Ham, Pritam Mukherjee, Siyi Tang, Sindhu Tipirneni, Veysel Kocaman, Suzanne Tamang, Robert Rallo, Chandan K. Reddy
AMIA3
2021 Self-Supervised Learning of Contextual Embeddings for Link Prediction in Heterogeneous Networks
abstract
Representation learning methods for heterogeneous networks produce a low-dimensional vector embedding (that is typically fixed for all tasks) for each node. Many of the existing methods focus on obtaining a static vector representation for a node in a way that is agnostic to the downstream application where it is being used. In practice, however, downstream tasks such as link prediction require specific contextual information that can be extracted from the subgraphs related to the nodes provided as input to the task. To tackle this challenge, we develop , a framework for bridging static representation learning methods using global information from the entire graph with localized attention driven mechanisms to learn contextual node representations. We first pre-train our model in a self-supervised manner by introducing higher-order semantic associations and masking nodes, and then fine-tune our model for a specific link prediction task. Instead of training node representations by aggregating information from all semantic neighbors connected via metapaths, we automatically learn the composition of different metapaths that characterize the context for a specific task without the need for any pre-defined metapaths. significantly outperforms both static and contextual embedding learning methods on several publicly available benchmark network datasets. We also demonstrate the interpretability, effectiveness of contextual learning, and the scalability of through extensive evaluation.
Ping Wang 0024, Khushbu Agarwal, Colby Ham, Sutanay Choudhury, Chandan K. Reddy
WWW3