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Learning Trajectory Preferences for Manipulators via Iterative Improvement
"... We consider the problem of learning good trajectories for manipulation tasks. This is challenging because the criterion defining a good trajectory varies with users, tasks and environments. In this paper, we propose a co-active online learning framework for teaching robots the preferences of its use ..."
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Cited by 25 (7 self)
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We consider the problem of learning good trajectories for manipulation tasks. This is challenging because the criterion defining a good trajectory varies with users, tasks and environments. In this paper, we propose a co-active online learning framework for teaching robots the preferences of its users for object manipulation tasks. The key novelty of our approach lies in the type of feedback expected from the user: the human user does not need to demonstrate optimal trajectories as training data, but merely needs to iteratively provide trajectories that slightly improve over the trajectory currently proposed by the system. We argue that this co-active preference feedback can be more easily elicited from the user than demonstrations of optimal trajectories, while, nevertheless, theoretical regret bounds of our algorithm match the asymptotic rates of optimal trajectory algorithms. We demonstrate the generalization ability of our algorithm on a variety of tasks, for whom, the preferences were not only influenced by the object being manipulated but also by the surrounding environment. 1.
COMPANION: A constraint-optimizing method for person-acceptable navigation
- IN THE PROCEEDINGS OF THE IEEE INTERNATIONAL SYMPOSIUM ON ROBOT AND HUMAN INTERACTIVE COMMUNICATION
, 2009
"... This paper introduces the COMPANION framework: ..."
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Understanding human interaction for probabilistic autonomous navigation using RiskRRT approach
- in IEEE/RSJ International Conference on Intelligent Robots and Systems
, 2011
"... Abstract — With the growing demand of personal assistance to mobility and mobile service robotics, robot navigation systems must be “aware ” of the social conventions followed by people. They must respect proximity constraints but also respect people interacting. For example, they may not break inte ..."
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Cited by 17 (10 self)
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Abstract — With the growing demand of personal assistance to mobility and mobile service robotics, robot navigation systems must be “aware ” of the social conventions followed by people. They must respect proximity constraints but also respect people interacting. For example, they may not break interaction between people talking, unless the occupants want to take part in the conversation. In this case, they must be able to join the group using a socially adapted behavior. This paper proposes a risk-based navigation method including both the traditional notion of risk of collision and the notion of risk of disturbance. Results exhibit new emerging behavior showing how a robot takes into account social conventions in its navigation strategy. Index Terms — Proxemics, Human aware navigation, risk assessment.
Addressing Cost-Space Chasms in Manipulation Planning
"... Abstract — Finding paths in high-dimensional spaces becomes difficult when we wish to optimize the cost of a path in addition to obeying feasibility constraints. Recently the T-RRT algorithm was presented as a method to plan in high-dimensional costspaces and it was shown to perform well across a va ..."
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Cited by 15 (6 self)
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Abstract — Finding paths in high-dimensional spaces becomes difficult when we wish to optimize the cost of a path in addition to obeying feasibility constraints. Recently the T-RRT algorithm was presented as a method to plan in high-dimensional costspaces and it was shown to perform well across a variety of problems. However, since the T-RRT relies solely on sampling to explore the space, it has difficulty navigating cost-space chasms– narrow low-cost regions surrounded by increasing cost. Such chasms are particularly common in planning for manipulators because many useful cost functions induce narrow or lowerdimensional low-cost areas. This paper presents the GradienT-RRT algorithm, which combines the T-RRT with a local gradient method to bias the search toward lower-cost regions. GradienT-RRT is effective at navigating chasms because it explores low-cost regions that are too narrow to explore by sampling alone. We compare the performance of T-RRT and GradienT-RRT on planning problems involving cost functions defined in workspace, task space, and C-space. We find that GradienT-RRT outperforms T-RRT in terms of the cost of the final path while maintaining better or comparable computation time. We also find that the cost of paths generated by GradienT-RRT is far less sensitive to changes in a key parameter, making it easier to tune the algorithm. Finally, we conclude with a demonstration of GradienT-RRT on a planning-withuncertainty task on the physical HERB robot. I.
Planning human-aware motions using a sampling-based costmap planner
- in Proc. IEEE ICRA
, 2011
"... Abstract — This paper addresses the motion planning problem while considering Human-Robot Interaction (HRI) constraints. The proposed planner generates collision-free paths that are acceptable and legible to the human. The method extends our previous work on human-aware path planning to cluttered en ..."
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Cited by 13 (6 self)
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Abstract — This paper addresses the motion planning problem while considering Human-Robot Interaction (HRI) constraints. The proposed planner generates collision-free paths that are acceptable and legible to the human. The method extends our previous work on human-aware path planning to cluttered environments. A randomized cost-based exploration method provides an initial path that is relevant with respect to HRI and workspace constraints. The quality of the path is further improved with a local path-optimization method. Simulation results on mobile manipulators in the presence of humans demonstrate the overall efficacy of the approach. I.
Integration of 6D object localization and obstacle detection for collision free robotic manipulation
- in Proc. IEEE/SICE Int. Sym. System Integration
, 2008
"... Abstract — The major goal of research regarding mobile service robotics is to enable a robot to assist human beings in their everyday life. This implies that the robot will have to deal with everyday life environments. One of the most important steps towards able service robots is to enhance the abi ..."
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Cited by 6 (1 self)
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Abstract — The major goal of research regarding mobile service robotics is to enable a robot to assist human beings in their everyday life. This implies that the robot will have to deal with everyday life environments. One of the most important steps towards able service robots is to enhance the ability to operate well in unstructured living environments. In this paper we focus on the integration of object recognition, obstacle detection and collision free manipulation to increase the service robots manipulation abilities in the context of highly unstructured environments.
Modeling environments from a route perspective
- In: ACM/IEEE international conference on human robot interaction (HRI2011). Piscataway: IEEE
, 2011
"... Environment attributes are perceived or remembered differently according to the perspective used. In this study, two different perspectives, a survey perspective and a route perspective, are explained and discussed. This paper proposes an approach for modeling human environments from a route perspec ..."
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Cited by 6 (3 self)
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Environment attributes are perceived or remembered differently according to the perspective used. In this study, two different perspectives, a survey perspective and a route perspective, are explained and discussed. This paper proposes an approach for modeling human environments from a route perspective, which is the perspective used when a human navigates through the environment. The process for route perspective semi-autonomous data extraction and modeling by a mobile robot equipped with a laser sensor and a camera is detailed. Finally, as an example of a route perspective application, a route direction robot was developed and tested in a real mall environment. Experimental results show the advantages of the proposed route perspective model compared with a survey perspective approach. Moreover, the route model is comparable to the performance of an expert person giving route guidance in the mall.
How Do People Walk Side-By-Side? – Using A Computational Model Of Human Behavior For A Social Robot
"... This paper presents a computational model for side-by-side walking for human-robot interaction (HRI). In this work we address the importance of future motion utility (motion anticipation) of the two walking partners. Previous studies only considered a robot moving alongside a person without collisio ..."
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Cited by 5 (1 self)
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This paper presents a computational model for side-by-side walking for human-robot interaction (HRI). In this work we address the importance of future motion utility (motion anticipation) of the two walking partners. Previous studies only considered a robot moving alongside a person without collisions with simple velocity-based predictions. In contrast, our proposed model includes two major considerations. First, it considers the current goal, modeling side-by-side walking, as a process of moving towards a goal while maintaining a relative position with the partner. Second, it takes the partner's utility into consideration; it models side-by-side walking as a phenomenon where two agents maximize mutual utilities rather than only considering a single agent utility. The model is constructed and validated with a set of trajectories from pairs of people recorded in side-by-side walking. Finally, our proposed model was tested in an autonomous robot walking side-by-side with participants and demonstrated to be effective.
Multiple depth/presence sensors: Integration and optimal placement for human/robot coexistence
- in Proc. IEEE Int. Conf. on Robotics and Automation, 2010
"... Abstract — Depth and presence sensors are used to prevent collisions in environments where human/robot coexistence is relevant. To address the problem of occluded areas, we extend in this paper a recently introduced efficient approach for preventing collisions using a single depth sensor to multiple ..."
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Cited by 4 (2 self)
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Abstract — Depth and presence sensors are used to prevent collisions in environments where human/robot coexistence is relevant. To address the problem of occluded areas, we extend in this paper a recently introduced efficient approach for preventing collisions using a single depth sensor to multiple depth and/or presence sensors. Their integration is systemat-ically handled by resorting to the concept of image planes, where computations can be suitable carried out on 2D data without reconstructing obstacles in 3D. To maximize the on-line collision detection performance by multiple sensor integration, an off-line optimal sensor placement problem is formulated in a probabilistic framework, using a cell decomposition and characterizing the probability of cells being in the shadow of obstacles or unobserved. This approach allows to fit the optimal numerical solution to the most probable operating conditions of a human and a robot sharing the same working area. Three examples of optimal sensor placement are presented. I.
Autonomous person following for telepresence robots
- IEEE International Conference on Robotics and Automation (ICRA
, 2013
"... Abstract-We present a method for a mobile robot to follow a person autonomously where there is an interaction between the robot and human during following. The planner takes into account the predicted trajectory of the human and searches future trajectories of the robot for the path with the highes ..."
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Cited by 3 (0 self)
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Abstract-We present a method for a mobile robot to follow a person autonomously where there is an interaction between the robot and human during following. The planner takes into account the predicted trajectory of the human and searches future trajectories of the robot for the path with the highest utility. Contrary to traditional motion planning, instead of determining goal points close to the person, we introduce a task dependent goal function which provides a map of desirable areas for the robot to be at, with respect to the person. The planning framework is flexible and allows encoding of different social situations with the help of the goal function. We implemented our approach on a telepresence robot and conducted a controlled user study to evaluate the experiences of the users on the remote end of the telepresence robot. The user study compares manual teleoperation to our autonomous method for following a person while having a conversation. By designing a behavior specific to a flat screen telepresence robot, we show that the person following behavior is perceived as safe and socially acceptable by remote users. All 10 participants preferred our autonomous following method over manual teleoperation.