AI/ML

Guided Uncertainty-Aware Policy Optimization: Combining Learning and Model-Based Strategies for Sample-Efficient Policy Learning. (arXiv:2005.10872v1 [cs.RO])




Traditional robotic approaches rely on an accurate model of the environment,
a detailed description of how to perform the task, and a robust perception
system to keep track of the current state. On the other hand, reinforcement
learning approaches can operate directly from raw sensory inputs with only a
reward signal to describe the task, but are extremely sample-inefficient and
brittle. In this work, we combine the strengths of model-based methods with the
flexibility of learning-based methods to obtain a general method that is able
to overcome inaccuracies in the robotics perception/actuation pipeline, while
requiring minimal interactions with the environment. This is achieved by
leveraging uncertainty estimates to divide the space in regions where the given
model-based policy is reliable, and regions where it may have flaws or not be
well defined. In these uncertain regions, we show that a locally learned-policy
can be used directly with raw sensory inputs. We test our algorithm, Guided
Uncertainty-Aware Policy Optimization (GUAPO), on a real-world robot performing
peg insertion. Videos are available at:
url{https://sites.google.com/view/guapo-rl}

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Thanks Vijay and agree. Can’t wait to read your post as well!

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