#wikipedia #reinforcementlearning #languagemodels
Original paper review here:
Machel Reid and Yutaro Yamada join me to discuss their recent paper on langauge model pre-training for decision transformers in offline reinforcement learning.
OUTLINE:
0:00 – Intro
1:00 – Brief paper, setup & idea recap
7:30 – Main experimental results & high standard deviations
10:00 – Why is there no clear winner?
13:00 – Why are bigger models not a lot better?
14:30 – What’s behind the name ChibiT?
15:30 – Why is iGPT underperforming?
19:15 – How are tokens distributed in Reinforcement Learning?
22:00 – What other domains could have good properties to transfer?
24:20 – A deeper dive into the models’ attention patterns
33:30 – Codebase, model sizes, and compute requirements
37:30 – Scaling behavior of pre-trained models
40:05 – What did not work out in this project?
42:00 – How can people get started and where to go next?
Paper:
Code:
My Video on Decision Transformer:
Abstract:
Fine-tuning reinforcement learning (RL) models has been challenging because of a lack of large scale off-the-shelf datasets as well as high variance in transferability among different environments. Recent work has looked at tackling offline RL from the perspective of sequence modeling with improved results as result of the introduction of the Transformer architecture. However, when the model is trained from scratch, it suffers from slow convergence speeds. In this paper, we look to take advantage of this formulation of reinforcement learning as sequence modeling and investigate the transferability of pre-trained sequence models on other domains (vision, language) when finetuned on offline RL tasks (control, games). To this end, we also propose techniques to improve transfer between these domains. Results show consistent performance gains in terms of both convergence speed and reward on a variety of environments, accelerating training by 3-6x and achieving state-of-the-art performance in a variety of tasks using Wikipedia-pretrained and GPT2 language models. We hope that this work not only brings light to the potentials of leveraging generic sequence modeling techniques and pre-trained models for RL, but also inspires future work on sharing knowledge between generative modeling tasks of completely different domains.
Authors: Machel Reid, Yutaro Yamada, Shixiang Shane Gu
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