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We investigate how reinforcement learning can be used to train level-designing agents. This represents a new approach to procedural content generation in games, where level design is framed as a game, and the content generator itself is…

Machine Learning · Computer Science 2020-08-14 Ahmed Khalifa , Philip Bontrager , Sam Earle , Julian Togelius

Procedural Content Generation via Reinforcement Learning (PCGRL) foregoes the need for large human-authored data-sets and allows agents to train explicitly on functional constraints, using computable, user-defined measures of quality…

Artificial Intelligence · Computer Science 2022-08-16 Zehua Jiang , Sam Earle , Michael Cerny Green , Julian Togelius

Procedural Content Generation (PCG) is widely used to create scalable and diverse environments in games. However, existing methods, such as the Wave Function Collapse (WFC) algorithm, are often limited to static scenarios and lack the…

Artificial Intelligence · Computer Science 2025-03-14 Aniruddha Srinivas Joshi

Procedural Content Generation via Reinforcement Learning (PCGRL) offers a method for training controllable level designer agents without the need for human datasets, using metrics that serve as proxies for level quality as rewards. Existing…

Artificial Intelligence · Computer Science 2025-10-07 Sam Earle , Zehua Jiang , Eugene Vinitsky , Julian Togelius

Procedural Content Generation via Reinforcement Learning (PCGRL) has been introduced as a means by which controllable designer agents can be trained based only on a set of computable metrics acting as a proxy for the level's quality and key…

Machine Learning · Computer Science 2024-08-23 Sam Earle , Zehua Jiang , Julian Togelius

Deep Reinforcement Learning achieves very good results in domains where reward functions can be manually engineered. At the same time, there is growing interest within the community in using games based on Procedurally Content Generation…

Machine Learning · Computer Science 2020-12-07 Alessandro Sestini , Alexander Kuhnle , Andrew D. Bagdanov

Text generation is a crucial task in NLP. Recently, several adversarial generative models have been proposed to improve the exposure bias problem in text generation. Though these models gain great success, they still suffer from the…

Computation and Language · Computer Science 2018-06-08 Zhan Shi , Xinchi Chen , Xipeng Qiu , Xuanjing Huang

Reward design plays a pivotal role in the training of game AIs, requiring substantial domain-specific knowledge and human effort. In recent years, several studies have explored reward generation for training game agents and controlling…

Artificial Intelligence · Computer Science 2026-05-26 In-Chang Baek , Sung-Hyun Kim , Sam Earle , Zehua Jiang , Jin-Ha Noh , Julian Togelius , Kyung-Joong Kim

Process Reward Models (PRMs) enhance reasoning ability of LLMs by providing step-level supervision. However, their widespread adoption is limited due to expensive manual step-level annotation and poor generalization of static training data…

Machine Learning · Computer Science 2025-12-01 Gurusha Juneja , Deepak Nathani , William Yang Wang

Large Language Models (LLMs) excel at code generation, yet their outputs often contain subtle bugs, for which effective test cases are a critical bottleneck. Existing test generation methods, whether based on prompting or supervised…

Software Engineering · Computer Science 2025-10-17 Qingyao Li , Xinyi Dai , Weiwen Liu , Xiangyang Li , Yasheng Wang , Ruiming Tang , Yong Yu , Weinan Zhang

Most of the existing generative adversarial networks (GAN) for text generation suffer from the instability of reinforcement learning training algorithms such as policy gradient, leading to unstable performance. To tackle this problem, we…

Computation and Language · Computer Science 2019-08-21 Pei Ke , Fei Huang , Minlie Huang , Xiaoyan Zhu

Recently, empowered with the powerful capabilities of neural networks, reinforcement learning (RL) has successfully tackled numerous challenging tasks. However, while these models demonstrate enhanced decision-making abilities, they are…

Machine Learning · Computer Science 2025-10-09 Zhengpeng Xie , Yulong Zhang

There are great interests as well as many challenges in applying reinforcement learning (RL) to recommendation systems. In this setting, an online user is the environment; neither the reward function nor the environment dynamics are clearly…

Machine Learning · Computer Science 2020-01-03 Xinshi Chen , Shuang Li , Hui Li , Shaohua Jiang , Yuan Qi , Le Song

Procedural Content Generation (PCG) refers to the practice, in videogames and other games, of generating content such as levels, quests, or characters algorithmically. Motivated by the need to make games replayable, as well as to reduce…

Artificial Intelligence · Computer Science 2020-03-18 Sebastian Risi , Julian Togelius

Deep reinforcement learning (RL) has shown impressive results in a variety of domains, learning directly from high-dimensional sensory streams. However, when neural networks are trained in a fixed environment, such as a single level in a…

Machine Learning · Computer Science 2018-11-30 Niels Justesen , Ruben Rodriguez Torrado , Philip Bontrager , Ahmed Khalifa , Julian Togelius , Sebastian Risi

Asynchronous Advantage Actor Critic (A3C) is an effective Reinforcement Learning (RL) algorithm for a wide range of tasks, such as Atari games and robot control. The agent learns policies and value function through trial-and-error…

Machine Learning · Computer Science 2019-12-03 Zhaoyuan Gu , Zhenzhong Jia , Howie Choset

We introduce Procgen Benchmark, a suite of 16 procedurally generated game-like environments designed to benchmark both sample efficiency and generalization in reinforcement learning. We believe that the community will benefit from increased…

Machine Learning · Computer Science 2020-07-28 Karl Cobbe , Christopher Hesse , Jacob Hilton , John Schulman

Reinforcement learning is a powerful technique to train an agent to perform a task. However, an agent that is trained using reinforcement learning is only capable of achieving the single task that is specified via its reward function. Such…

Machine Learning · Computer Science 2018-07-24 Carlos Florensa , David Held , Xinyang Geng , Pieter Abbeel

Retrieval-Augmented Generation (RAG) systems have emerged as a promising solution to mitigate LLM hallucinations and enhance their performance in knowledge-intensive domains. However, these systems are vulnerable to adversarial poisoning…

Information Retrieval · Computer Science 2025-07-29 Jinyan Su , Jin Peng Zhou , Zhengxin Zhang , Preslav Nakov , Claire Cardie

Learning to autonomously navigate the web is a difficult sequential decision making task. The state and action spaces are large and combinatorial in nature, and websites are dynamic environments consisting of several pages. One of the…

Machine Learning · Computer Science 2021-03-04 Izzeddin Gur , Natasha Jaques , Kevin Malta , Manoj Tiwari , Honglak Lee , Aleksandra Faust
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