Search Results for author: Gayan K. Kulatilleke

Found 11 papers, 5 papers with code

Ugly Ducklings or Swans: A Tiered Quadruplet Network with Patient-Specific Mining for Improved Skin Lesion Classification

no code implementations18 Sep 2023 Nathasha Naranpanawa, H. Peter Soyer, Adam Mothershaw, Gayan K. Kulatilleke, ZongYuan Ge, Brigid Betz-Stablein, Shekhar S. Chandra

An ugly duckling is an obviously different skin lesion from surrounding lesions of an individual, and the ugly duckling sign is a criterion used to aid in the diagnosis of cutaneous melanoma by differentiating between highly suspicious and benign lesions.

Lesion Classification Metric Learning +1

NBC-Softmax : Darkweb Author fingerprinting and migration tracking

1 code implementation15 Dec 2022 Gayan K. Kulatilleke, Shekhar S. Chandra, Marius Portmann

An author style detection task is a metric learning problem, where learning style features with small intra-class variations and larger inter-class differences is of great importance to achieve better performance.

Metric Learning

Efficient block contrastive learning via parameter-free meta-node approximation

1 code implementation28 Sep 2022 Gayan K. Kulatilleke, Marius Portmann, Shekhar S. Chandra

In this work, we propose a meta-node based approximation technique that can (a) proxy all negative combinations (b) in quadratic cluster size time complexity, (c) at graph level, not node level, and (d) exploit graph sparsity.

Contrastive Learning Graph Clustering

Empirical study of Machine Learning Classifier Evaluation Metrics behavior in Massively Imbalanced and Noisy data

no code implementations25 Aug 2022 Gayan K. Kulatilleke, Sugandika Samarakoon

In this work, we develop a theoretical foundation to model human annotation errors and extreme imbalance typical in real world fraud detection data sets.

Fraud Detection

Credit card fraud detection - Classifier selection strategy

no code implementations25 Aug 2022 Gayan K. Kulatilleke

Machine learning has opened up new tools for financial fraud detection.

Fraud Detection

Challenges and Complexities in Machine Learning based Credit Card Fraud Detection

no code implementations20 Aug 2022 Gayan K. Kulatilleke

Given past transactions, a machine learning algorithm has the ability to 'learn' infinitely complex characteristics in order to identify frauds in real-time, surpassing the best human investigators.

Fraud Detection

SCGC : Self-Supervised Contrastive Graph Clustering

1 code implementation27 Apr 2022 Gayan K. Kulatilleke, Marius Portmann, Shekhar S. Chandra

We also propose SCGC*, with a more effective, novel, Influence Augmented Contrastive (IAC) loss to fuse richer structural information, and half the original model parameters.

Clustering Graph Clustering

Inspection-L: Self-Supervised GNN Node Embeddings for Money Laundering Detection in Bitcoin

no code implementations20 Mar 2022 Wai Weng Lo, Gayan K. Kulatilleke, Mohanad Sarhan, Siamak Layeghy, Marius Portmann

The proposed method was evaluated on the Elliptic dataset and shows that our approach outperforms the state-of-the-art in terms of key classification metrics, which demonstrates the potential of self-supervised GNN in the detection of illicit cryptocurrency transactions.

FDGATII : Fast Dynamic Graph Attention with Initial Residual and Identity Mapping

1 code implementation21 Oct 2021 Gayan K. Kulatilleke, Marius Portmann, Ryan Ko, Shekhar S. Chandra

While Graph Neural Networks have gained popularity in multiple domains, graph-structured input remains a major challenge due to (a) over-smoothing, (b) noisy neighbours (heterophily), and (c) the suspended animation problem.

Fairness Graph Attention +1

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