Search Results for author: Konstantina Christakopoulou

Found 7 papers, 0 papers with code

Large Language Models for User Interest Journeys

no code implementations24 May 2023 Konstantina Christakopoulou, Alberto Lalama, Cj Adams, Iris Qu, Yifat Amir, Samer Chucri, Pierce Vollucci, Fabio Soldo, Dina Bseiso, Sarah Scodel, Lucas Dixon, Ed H. Chi, Minmin Chen

We argue, and demonstrate through extensive experiments, that LLMs as foundation models can reason through user activities, and describe their interests in nuanced and interesting ways, similar to how a human would.

Natural Language Understanding Recommendation Systems

Reward Shaping for User Satisfaction in a REINFORCE Recommender

no code implementations30 Sep 2022 Konstantina Christakopoulou, Can Xu, Sai Zhang, Sriraj Badam, Trevor Potter, Daniel Li, Hao Wan, Xinyang Yi, Ya Le, Chris Berg, Eric Bencomo Dixon, Ed H. Chi, Minmin Chen

How might we design Reinforcement Learning (RL)-based recommenders that encourage aligning user trajectories with the underlying user satisfaction?

Imputation Reinforcement Learning (RL)

Rethinking Reinforcement Learning for Recommendation: A Prompt Perspective

no code implementations15 Jun 2022 Xin Xin, Tiago Pimentel, Alexandros Karatzoglou, Pengjie Ren, Konstantina Christakopoulou, Zhaochun Ren

As reinforcement learning (RL) naturally fits this objective -- maximizing an user's reward per session -- it has become an emerging topic in recommender systems.

Recommendation Systems reinforcement-learning +1

Towards Content Provider Aware Recommender Systems: A Simulation Study on the Interplay between User and Provider Utilities

no code implementations6 May 2021 Ruohan Zhan, Konstantina Christakopoulou, Ya Le, Jayden Ooi, Martin Mladenov, Alex Beutel, Craig Boutilier, Ed H. Chi, Minmin Chen

We then build a REINFORCE recommender agent, coined EcoAgent, to optimize a joint objective of user utility and the counterfactual utility lift of the provider associated with the recommended content, which we show to be equivalent to maximizing overall user utility and the utilities of all providers on the platform under some mild assumptions.

counterfactual Recommendation Systems

Adversarial Recommendation: Attack of the Learned Fake Users

no code implementations21 Sep 2018 Konstantina Christakopoulou, Arindam Banerjee

We propose a framework for generating fake user profiles which, when incorporated in the training of a recommendation system, can achieve an adversarial intent, while remaining indistinguishable from real user profiles.

Recommendation Systems

Glass-Box Program Synthesis: A Machine Learning Approach

no code implementations25 Sep 2017 Konstantina Christakopoulou, Adam Tauman Kalai

Our results show that (i) performing 4 rounds of our framework typically solves about 70% of the target problems, (ii) our framework can improve itself even in domain agnostic scenarios, and (iii) it can solve problems that would be otherwise too slow to solve with brute-force search.

BIG-bench Machine Learning Program Synthesis

Recommendation under Capacity Constraints

no code implementations18 Jan 2017 Konstantina Christakopoulou, Jaya Kawale, Arindam Banerjee

In this paper, we investigate the common scenario where every candidate item for recommendation is characterized by a maximum capacity, i. e., number of seats in a Point-of-Interest (POI) or size of an item's inventory.

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