This paper describes the software and algorithmic issues involved in developing scalable large-scale biologically-inspired spiking neural networks. These neural networks are useful in object recognition and signal pro...
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ISBN:
(纸本)9780769532721
This paper describes the software and algorithmic issues involved in developing scalable large-scale biologically-inspired spiking neural networks. These neural networks are useful in object recognition and signal processing tasks, but will also be useful in simulations to help understand the human brain. The software is written using object oriented programming and is very general and usable for processing a wide range of sensor data and for data fusion.
Neuromodulation is thought to he one of the underlying principles of learning and memory in biological neural networks. Recent experiments have shown that neuroevolutionary methods benefit from neuromodulation in simp...
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ISBN:
(纸本)9780769532721
Neuromodulation is thought to he one of the underlying principles of learning and memory in biological neural networks. Recent experiments have shown that neuroevolutionary methods benefit from neuromodulation in simple grid-world problems. In this paper we investigate the performance of a neuroevolutionary method applied to a more realistic robotic task. While confirming the favorable effect of neuromodulatory structures, our results indicate that the evolution of such architectures requires a mechanism which allows for selective modular targetting of the neuromodulatory connections.
This paper presents a learning algorithm called surprise-based learning (SBL) capable (of providing physical robot the ability to ataonomonsly learn and plan in an unknown environment without any prior knowledge of it...
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ISBN:
(纸本)9780769532721
This paper presents a learning algorithm called surprise-based learning (SBL) capable (of providing physical robot the ability to ataonomonsly learn and plan in an unknown environment without any prior knowledge of its actions or their impact on the environment. This is achieved by creating a model of the environment using prediction rules. A prediction rule describes the observations of the environment prior to the execution of an action and the forecasted or predicted observation of the environment after the action. The algorithm learns by investigating "surprises", which are inconsistencies between the predictions and observed outcome. SBL has been successfully demonstrated on a Modular robot learning and navigating in a small static environment.
We present a connectionist approach to learn forward and redundant inverse kinematics in a single recurrent network. The network architecture extends the reservoir computing idea, i.e. to read out the state of a fixed...
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ISBN:
(纸本)9780769532721
We present a connectionist approach to learn forward and redundant inverse kinematics in a single recurrent network. The network architecture extends the reservoir computing idea, i.e. to read out the state of a fixed dynamic system, into an associative setting, which learns the forward and backward mapping simultaneously. For output learning we use efficient Backpropagation-Decorrelation learning while the recurrent dynamics is adjusted by an unsupervised biologically inspired learning rule based on intrinsic plasticity. Including linear connections between input and output allows to train the network for autonomous movement generation. We show results for the 7-DOF redundant PA-10 robot arm in simulation.
In society subsystems are formed to reduce uncertainty Subsystems are composed by agents with a reduced behavioural complexity. For example in society there are people who produce goods and other who distribute them. ...
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ISBN:
(纸本)9780769532721
In society subsystems are formed to reduce uncertainty Subsystems are composed by agents with a reduced behavioural complexity. For example in society there are people who produce goods and other who distribute them. In this paper we show, that sub-systems emerge when the agents art able to learn and have the ability to communicate. Both the behaviour and communication is learned by the agent and is not imposed on the agent. Here the task is to collect food, keep it and eat it until sated. Every agent communicates its satedness state to neighbouring agents. This results in two subsystems whereas agents in the first collect food and in the latter steal food from others. The ratio between the number of agents that belongs to the first system and to the second system, depends on the number of food resources which are limited in space and time.
We present a genetic programming system to evolve vision based obstacle avoidance algorithms. In order to develop autonomous behavior in a mobile robot, our purpose is to design automatically an obstacle avoidance con...
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ISBN:
(纸本)9780769532721
We present a genetic programming system to evolve vision based obstacle avoidance algorithms. In order to develop autonomous behavior in a mobile robot, our purpose is to design automatically an obstacle avoidance controller adapted to the current context. We first record short sequences where we manually guide the robot to move away from the walls. This set of recorded video images and commands is our learning base. Genetic programming is used as a supervised learning system to generate algorithms that exhibit this corridor centering behavior: We show that the generated algorithms are efficient in the corridor that was used to build the learning base, and that they generalize to some extent when the robot is placed in a visually different corridor More, the evolution process has produced algorithms that go past a limitation of our system, that is the lack of adequate edge extraction primitives. This is a good indication of the ability of this method to find efficient solutions kinds of environments.
A conceptual framework for online evolution in roboticsystems called Indirect Online Evolution (IDOE) is presented. A model specie automatically infers models of a hidden physical system by the use of Gene Expression...
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ISBN:
(纸本)9780769532721
A conceptual framework for online evolution in roboticsystems called Indirect Online Evolution (IDOE) is presented. A model specie automatically infers models of a hidden physical system by the use of Gene Expression Programming (GEP). A parameter specie simultaneously optimizes the parameters of the inferred models according to a specified target vector. Training vectors required for modelling are automatically provided online by the interplay between the two coevolving species and the physical system. At every generation, only the estimated fittest individual of the parameter specie is executed on the physical system. This approach thus limits both the evaluation time, the wear out and the potential hazards normally associated with direct online evolution (DOE) where every individual has to be evaluated on the physical system. Additionally, the approach enables continuous system identification and adaptation during normal operation. Features of IDOE are illustrated by inferring models of a simplified, robotic arm, and further optimizing the parameters of the system according to a target position of the end effector. Simulated experiments indicate that the fitness of the IDOE approach is generally higher than the average fitness of IDOE.
Accurate models of the robot dynamics allow the design of significantly more precise, energy-efficient and more compliant computed torque control for robots. However, in some cases the accuracy of rigid-body models do...
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ISBN:
(纸本)9780769532721
Accurate models of the robot dynamics allow the design of significantly more precise, energy-efficient and more compliant computed torque control for robots. However, in some cases the accuracy of rigid-body models does not suffice for sound control performance due to unmodeled nonlinearities such as hydraulic cables, complex friction, or actuator dynamics. In such cases, learning the models from data poses an interesting alternative and estimating the dynamics model using regression techniques becomes an important problem. However, the most accurate regression methods, e.g. Gaussian processes regression (GPR) and support vector regression (SVR), suffer from exceptional high computational complexity which prevents their usage for large numbers of samples or online learning to date. We proposed an approximation to the standard GPR using local Gaussian processes models inspired by [1], [2]. Due to reduced computational cost, local Gaussian processes (LGP) is capable for an online learning. Comparisons with other nonparametric regressions, e.g. standard GPR, v-SVR and locally weighted projection regression (LWPR), show that LGP has higher accuracy than LWPR and close to the performance of standard GPR and v-SVR while being sufficiently fast for online learning.
Autonomous vehicles con significantly improve efficiency and safety in applications ranging from warfare to transportation. However, to supply those benefits they must be shown to operate effectively, safely, and reli...
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ISBN:
(纸本)9780769532721
Autonomous vehicles con significantly improve efficiency and safety in applications ranging from warfare to transportation. However, to supply those benefits they must be shown to operate effectively, safely, and reliably in a wide range of terrains and conditions. Most major successes with autonomous vehicles have been limited to somewhat structured environments. We are interested in autonomous vehicles that can operate in forested areas, which are one of the most unstructured and difficult terrains due to the high number and varied nature of potential obstacles, the complexity of the visual field, and the difficulty in getting a good GPS fix due to overhead interference. In this paper we present a novel control system designed with the eventual goal of forest operation. It is built on top of the learning Applied to Ground robotics (LAGR) system developed at Carnegie Mellon. The new control system consists of the University of Idaho (UI) LAGR Planner and the UI software for LAGR Vision system. The results show that the combination of these two modules significantly improve the capabilities of the LAGR robot and, more importantly, allow it to perform autonomously in complex environments such as primitive forest trails that the base system could not navigate.
A major concern for robotic guidance systems is that a temporary or permanent failure of a given sensor within the system will erroneously trigger a potential system failure state. This paper introduces a generalised ...
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ISBN:
(纸本)9780769532721
A major concern for robotic guidance systems is that a temporary or permanent failure of a given sensor within the system will erroneously trigger a potential system failure state. This paper introduces a generalised artificial neural system which is capable of addressing such problems by means of the inclusion of a weight value able to incorporate a distinct failure value. This will serve to significantly improve the performance and reliability of the guidance system.
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