Language Models, Agent Models, and World Models: The LAW for Machine Reasoning and Planning
Paper · 2023 · Zhiting Hu and Tianmin Shu
Summary
This position paper argues that large language models (LLMs) such as GPT-4 reason and plan unreliably across language, embodied, and social tasks. The authors trace this to three weaknesses. In inference, LLMs generate text left to right in one pass. In learning, they imitate text corpora without interacting with the world. In modeling, language is ambiguous, lacks grounding, and is an inefficient medium for physical detail.
Drawing on cognitive science, the authors propose the LAW framework, which links language models, agent models, and world models. World and agent models act as the abstraction of reasoning: they hold beliefs, goals or rewards, predictions of action outcomes, and deliberate planning. LMs serve as the computational backend that implements these models or their parts.
The paper presents no new dataset or experiments. Instead, it surveys related work and sets out a research roadmap: training LMs on embodied and social experience, multimodal world modeling, and tool use. Its value is a unifying view that may guide work toward more robust, human-like machine reasoning.
Key points
- Authors are Zhiting Hu (UCSD) and Tianmin Shu (JHU). Figure 1 shows GPT-4 failing simple language, embodied (including Blocks World), and social reasoning tasks.
- The three models are formalized as follows:
- An LM predicts the next token, P(x_t | x_1:t−1).
- A world model gives state-transition probabilities, T(s′ | s, a).
- An agent model adds goals, beliefs about the world, and beliefs about other agents. Reasoning about others' minds requires nested agent models.
- The proposed roadmap includes:
- fine-tuning LMs on embodied experiences while preserving their language skills;
- social learning from humans and other models;
- tool use via fine-tuning, in-context learning, or tool embeddings.
- For multimodal world modeling, the authors judge models like GPT-4V, LLaVA, and Gemini insufficient because they cannot generate future states sequentially. They envision a multi-level world model that combines symbolic states (e.g., scene graphs) with action-conditioned, diffusion-based video prediction.
- Acknowledged limitations:
- The framework relies on discrete symbolic representations.
- It assumes behavior is driven by goals, overlooking influences such as social norms.
- It does not address the inherent limits of Transformer architectures.
Fields, topics and concepts
📚 Shelves 2The field of science this work belongs to (OpenAlex fields).Computer Science · 19,503 worksArtificial Intelligence · 18,805 works
🧭 Topics 2Research subjects and languages the work is about.Reasoning · 1,948 worksLegal AI · 157 works
Cite
Cite as Zhiting Hu and Tianmin Shu. 2023. Language Models, Agent Models, and World Models: The LAW for Machine Reasoning and Planning. arXiv:2312.05230.
@misc{hu2023language,
title = {{Language Models, Agent Models, and World Models: The LAW for Machine Reasoning and Planning}},
author = {Zhiting Hu and Tianmin Shu},
year = {2023},
doi = {10.48550/arxiv.2312.05230},
eprint = {2312.05230},
archivePrefix = {arXiv},
url = {https://doi.org/10.48550/arxiv.2312.05230}
}References
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