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GraphChef: Decision-Tree Recipes to Explain Graph Neural Networks
(2024)The Twelfth International Conference on Learning RepresentationsWe propose a new self-explainable Graph Neural Network (GNN) model: GraphChef. GraphChef integrates decision trees into the GNN message passing framework. Given a dataset, GraphChef returns a set of rules (a recipe) that explains each class in the dataset unlike existing GNNs and explanation methods that reason on individual graphs. Thanks to the decision trees, GraphChef recipes are human understandable. We also present a new pruning ...Conference Paper -
Efficient and Scalable Graph Generation through Iterative Local Expansion
(2024)In the realm of generative models for graphs, extensive research has been conducted. However, most existing methods struggle with large graphs due to the complexity of representing the entire joint distribution across all node pairs and capturing both global and local graph structures simultaneously. To overcome these issues, we introduce a method that generates a graph by progressively expanding a single node to a target graph. In each ...Conference Paper -
Optimus: Warming Serverless ML Inference via Inter-Function Model Transformation
(2024)Conference Paper -
Dissecting the EIP-2930 Optional Access Lists
(2024)Ethereum introduced Transaction Access Lists (TALs) in 2020 to optimize gas costs during transaction execution. In this work, we present a comprehensive analysis of TALs in Ethereum, focusing on adoption, quality, and gas savings. Analyzing a full month of mainnet data with 31,954,474 transactions, we found that only 1.46% of transactions included a TAL, even though 42.6% of transactions would have benefited from it. On average, access ...Conference Paper -
The Role of Facial and Speech Features in Emotion Classification
(2024)In this study, we investigate the role of facial and speech features in improving the accuracy of emotion classification methods. First, we evaluate the performance of state-of-the-art models in speech and facial emotion classification, ranging from computationally intensive ones to those employing efficient feature extraction techniques. We also evaluate the utility of partial facial features (eyes and mouth) when a complete video feed ...Conference Paper -
A Fair and Resilient Decentralized Clock Network for Transaction Ordering
(2024)Leibniz International Proceedings in Informatics (LIPIcs) ~ 27th International Conference on Principles of Distributed Systems (OPODIS 2023)Traditional blockchain design gives miners or validators full control over transaction ordering, i.e., they can freely choose which transactions to include or exclude, as well as in which order. While not an issue initially, the emergence of decentralized finance has introduced new transaction order dependencies allowing parties in control of the ordering to make a profit by front-running others’ transactions. In this work, we present the ...Conference Paper -
DeFi and NFTs Hinder Blockchain Scalability
(2024)Lecture Notes in Computer Science ~ Financial Cryptography and Data SecurityMany classical blockchains are known to have an embarrassingly low transaction throughput, down to Bitcoin's notorious seven transactions per second limit. Various proposals and implementations for increasing throughput emerged in the first decade of blockchain research. But how much concurrency is possible? In their early days, blockchains were mostly used for simple transfers from user to user. More recently, however, decentralized ...Conference Paper -
The Hidden Shortcomings of (D)AOs - An Empirical Study of On-Chain Governance
(2024)Lecture Notes in Computer Science ~ Financial Cryptography and Data Security. FC 2023 International WorkshopsDecentralized autonomous organizations (DAOs) are a recent innovation in organizational structures, which are already widely used in the blockchain ecosystem. We empirically study the on-chain governance systems of 21 DAOs and open source the live dataset. The DAOs we study are of various size and activity, and govern a wide range of protocols and services, such as decentralized exchanges, lending protocols, infrastructure projects and ...Conference Paper -
DeFi Auditing: Mechanisms, Effectiveness, and User Perceptions
(2024)Lecture Notes in Computer Science ~ Financial Cryptography and Data Security. FC 2023 International Workshops: Voting, CoDecFin, DeFi, WTSC, Bol, Brač, Croatia, May 5, 2023, Revised Selected PapersDecentralized Finance (DeFi), a blockchain-based financial ecosystem, suffers from smart contract vulnerabilities that led to a loss exceeding 3.24 billion USD by April 2022 [67]. To address this, blockchain firms audit DeFi applications, a process known as DeFi auditing. Our research aims to comprehend the mechanism and efficacy of DeFi auditing. We discovered its ability to detect vulnerabilities in smart contract logic and interactivity ...Conference Paper -
Short Squeeze in DeFi Lending Market: Decentralization in Jeopardy?
(2024)Lecture Notes in Computer Science ~ Financial Cryptography and Data Security. FC 2023 International Workshops: Voting, CoDecFin, DeFi, WTSC, Bol, Brač, Croatia, May 5, 2023, Revised Selected PapersAnxiety levels in the Aave community spiked in November 2022 as Avi Eisenberg performed an attack on Aave. Eisenberg attempted to short the CRV token by using funds borrowed on the protocol to artificially deflate the value of CRV. While the attack was ultimately unsuccessful, it left the Aave community scared and even raised question marks regarding the feasibility of large lending platforms under decentralized governance. In this work, ...Conference Paper