Search Results for author: Sepanta Zeighami

Found 10 papers, 3 papers with code

RAG Without the Lag: Interactive Debugging for Retrieval-Augmented Generation Pipelines

no code implementations18 Apr 2025 Quentin Romero Lauro, Shreya Shankar, Sepanta Zeighami, Aditya Parameswaran

Retrieval-augmented generation (RAG) pipelines have become the de-facto approach for building AI assistants with access to external, domain-specific knowledge.

Language Modeling Language Modelling +2

LLM-Powered Proactive Data Systems

no code implementations18 Feb 2025 Sepanta Zeighami, Yiming Lin, Shreya Shankar, Aditya Parameswaran

Such data systems do as they are told, but fail to understand and leverage what the LLM is being asked to do (i. e. the underlying operations, which may be error-prone), the data the LLM is operating on (e. g., long, complex documents), or what the user really needs.

Towards Establishing Guaranteed Error for Learned Database Operations

no code implementations9 Nov 2024 Sepanta Zeighami, Cyrus Shahabi

Machine learning models have demonstrated substantial performance enhancements over non-learned alternatives in various fundamental data management operations, including indexing (locating items in an array), cardinality estimation (estimating the number of matching records in a database), and range-sum estimation (estimating aggregate attribute values for query-matched records).

Attribute

Theoretical Analysis of Learned Database Operations under Distribution Shift through Distribution Learnability

no code implementations9 Nov 2024 Sepanta Zeighami, Cyrus Shahahbi

Use of machine learning to perform database operations, such as indexing, cardinality estimation, and sorting, is shown to provide substantial performance benefits.

NUDGE: Lightweight Non-Parametric Fine-Tuning of Embeddings for Retrieval

1 code implementation4 Sep 2024 Sepanta Zeighami, Zac Wellmer, Aditya Parameswaran

Existing approaches either fine-tune the pre-trained model itself or, more efficiently, but at the cost of accuracy, train adaptor models to transform the output of the pre-trained model.

Image Retrieval RAG +1

On Distribution Dependent Sub-Logarithmic Query Time of Learned Indexing

no code implementations19 Jun 2023 Sepanta Zeighami, Cyrus Shahabi

In this paper, we significantly strengthen this result, showing that under mild assumptions on data distribution, and the same space complexity as non-learned methods, learned indexes can answer queries in $O(\log\log n)$ expected query time.

Management

Towards Accurate Spatiotemporal COVID-19 Risk Scores using High Resolution Real-World Mobility Data

1 code implementation14 Dec 2020 Sirisha Rambhatla, Sepanta Zeighami, Kameron Shahabi, Cyrus Shahabi, Yan Liu

As countries look towards re-opening of economic activities amidst the ongoing COVID-19 pandemic, ensuring public health has been challenging.

Policy Tree Network

no code implementations25 Sep 2019 Zac Wellmer, Sepanta Zeighami, James Kwok

However, decision-time planning with implicit dynamics models in continuous action space has proven to be a difficult problem.

Model-based Reinforcement Learning MuJoCo +5

Finding Average Regret Ratio Minimizing Set in Database

3 code implementations18 Oct 2018 Sepanta Zeighami, Raymong Chi-Wing Wong

This problem takes into account the probability distribution of the users and considers the satisfaction (ratio) of all users, which is more reasonable in practice, compared with the existing studies that only consider the worst-case satisfaction (ratio) of the users, which may not reflect the whole population and is not useful in some applications.

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