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Poster
Node Embeddings and Exact Low-Rank Representations of Complex Networks
Sudhanshu Chanpuriya · Cameron Musco · Konstantinos Sotiropoulos · Charalampos Tsourakakis

Tue Dec 08 09:00 AM -- 11:00 AM (PST) @ Poster Session 1 #460
in Poster Session 2 »

Low-dimensional embeddings, from classical spectral embeddings to modern neural-net-inspired methods, are a cornerstone in the modeling and analysis of complex networks. Recent work by Seshadhri et al. (PNAS 2020) suggests that such embeddings cannot capture local structure arising in complex networks. In particular, they show that any network generated from a natural low-dimensional model cannot be both sparse and have high triangle density (high clustering coefficient), two hallmark properties of many real-world networks.

In this work we show that the results of Seshadhri et al. are intimately connected to the model they use rather than the low-dimensional structure of complex networks. Specifically, we prove that a minor relaxation of their model can generate sparse graphs with high triangle density. Surprisingly, we show that this same model leads to exact low-dimensional factorizations of many real-world networks. We give a simple algorithm based on logistic principal component analysis (LPCA) that succeeds in finding such exact embeddings. Finally, we perform a large number of experiments that verify the ability of very low-dimensional embeddings to capture local structure in real-world networks.

Author Information

Sudhanshu Chanpuriya (University of Massachusetts Amherst)
Cameron Musco (University of Massachusetts Amherst)
Konstantinos Sotiropoulos (Boston University)
Charalampos Tsourakakis (Boston University/ISI foundation)

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