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Title: The Ingredients of Real World Robotic Reinforcement Learning

Paper content:
The success of reinforcement learning in the real world has been limited to instrumented laboratory scenarios, often requiring arduous human supervision to enable continuous learning.
In this work, we discuss the required elements of a robotic system that can continually and autonomously improve with data collected in the real world, and propose a particular instantiation of such a system.
Subsequently, we investigate a number of challenges of learning without instrumentation -- including the lack of episodic resets, state estimation, and hand-engineered rewards -- and propose simple, scalable solutions to these challenges.
We demonstrate the efficacy of our proposed system on dexterous robotic manipulation tasks in simulation and the real world, and also provide an insightful analysis and ablation study of the challenges associated with this learning paradigm.
Reinforcement learning (RL) can in principle enable real-world autonomous systems, such as robots, to autonomously acquire a large repertoire of skills.
Perhaps more importantly, reinforcement learning can enable such systems to continuously improve the proficiency of their skills from experience.
However, realizing this promise in reality has proven challenging: even with reinforcement learning methods that can acquire complex behaviors from high-dimensional low-level observations, such as images, the typical assumptions of the reinforcement learning problem setting do not fit perfectly into the constraints of the real world.
For this reason, most successful robotic learning experiments have been demonstrated with varying levels of instrumentation, in order to make it practical to define reward functions (e.g. by using auxiliary sensors (Haarnoja et al., 2018a; Kumar et al., 2016; Andrychowicz et al., 2018) ), and in order to make it practical to reset the environment between trials (e.g. using manually engineered contraptions ).
In order to really make it practical for autonomous learning systems to improve continuously through real-world operation, we must lift these constraints and design learning systems whose assumptions match the constraints of the real world, and allow for uninterrupted continuous learning with large amounts of real world experience.
What exactly is holding back our reinforcement learning algorithms from being deployed for learning robotic tasks (for instance manipulation) directly in the real world?
We hypothesize that our current reinforcement learning algorithms make a number of unrealistic assumptions that make real world deployment challenging -access to low-dimensional Markovian state, known reward functions, and availability of episodic resets.
In practice, this means that significant human engineering is required to materialize these assumptions in order to conduct real-world reinforcement learning, which limits the ability of learning-enabled robots to collect large amounts of experience automatically in a variety of naturally occuring environments.
Even if we can engineer a complex solution for instrumentation in one environment, the same may need to be done for every environment being learned in.
When using deep function approximators, actually collecting large amounts of real world experience is typically crucial for effective generalization.
The inability to collect large amounts of real world data autonomously significantly limits the ability of these robots to learn robust, generalizable behaviors.
In this work, we propose that overcoming these challenges requires designing robotic systems that possess three fundamental capabilities: (1) they are able to learn from their own raw sensory inputs, (2) they are able to assign rewards to their own behaviors with minimal human intervention, (3) they are able to learn continuously in non-episodic settings without requiring human operators to manually reset the environment.
We believe that a system with these capabilities will bring us significantly closer to the goal of continuously improv-ing robotic agents that leverage large amounts of their own real world experience, without requiring significant human instrumentation and engineering effort.
Having laid out these requirements, we propose a practical instantiation of such a learning system, which afford the above capabilities.
While prior works have studied each of these issues in isolation, combining solutions to these issues is non-trivial and results in a particularly challenging learning problem.
We provide a detailed empirical analysis of these issues, both in simulation and on a real-world robotic platform, and propose a number of simple but effective solutions that can make it possible to produce a complete robotic learning system that can learn autonomously, handle raw sensory inputs, learn reward functions from easily available supervision, and learn without manually designed reset mechanisms.
We show that this system is well suited for learning dexterous robotic manipulation tasks in the real world, and substantially outperforms ablations and prior work.
While the individual components that we combine to design our robotic learning system are based heavily on prior work, both the combination of these components and their specific instantiations are novel.
Indeed, we show that without the particular design decisions motivated by our experiments, naïve designs that follow prior work generally fail to satisfy one of the three requirements that we lay out.
We presented the design and instantiation of R3L , a system for real world reinforcement learning.
We identify and investigate the various ingredients required for such a system to scale gracefully with minimal human engineering and supervision.
We show that this system must be able to learn from raw sensory observations, learn from very easily specified reward functions without reward engineering, and learn without any episodic resets.
We describe the basic elements that are required to construct such a system, and identify unexpected learning challenges that arise from interplay of these elements.
We propose simple and scalable fixes to these challenges through introducing unsupervised representation learning and a randomized perturbation controller.
We show the effectiveness on such a system at learning without instrumentation in several simulated and real world environments.
The ability to train robots directly in the real world with minimal instrumentation opens a number of exciting avenues for future research.
Robots that can learn unattended, without resets or handdesigned reward functions, can in principle collect very large amounts of experience autonomously, which may enable very broad generalization in the future.
Furthermore, fully autonomous learning should make it possible for robots to acquire large behavioral repertoires, since each additional task requires only the initial examples needed to learn the reward.
However, there are also a number of additional challenges, including sample complexity, optimization and exploration difficulties on more complex tasks, safe operation, communication latency, sensing and actuation noise, and so forth, all of which would need to be addressed in future work in order to enable truly scalable realworld robotic learning.
Initialize RND target and predictor networks f (s),f (s)
Initialize VICE reward classifier r VICE (s)
Initialize replay buffer D

assistant: text: System to learn robotic tasks in the real world with reinforcement learning without instrumentation