Under efficiency improvement of road networks by utilizing advanced traffic signal control methods, intelligent transportation systems intend to characterize a smart city. Recently, due to significant progress in artificial intelligence, machine learning‐based framework of adaptive traffic signal control has been highly concentrated. In particular, deep Q‐learning neural network is a model‐free technique and can be applied to optimal action selection problems. However, setting variable green time is a key mechanism to reflect traffic fluctuations such that time steps need not be fixed intervals in reinforcement learning framework. In this study, the authors proposed a dynamic discount factor embedded in the iterative Bellman equation to prevent from a biased estimation of action‐value function due to the effects of inconstant time step interval. Moreover, action is added to the input layer of the neural network in the training process, and the output layer is the estimated action‐value for the denoted action. Then, the trained neural network can be used to generate action that leads to an optimal estimated value within a finite set as the agents' policy. The preliminary results show that the trained agent outperforms a fixed timing plan in all testing cases with reducing system total delay by 20%..
Value‐based deep reinforcement learning for adaptive isolated intersection signal control
IET Intelligent Transport Systems ; 12 , 9 ; 1005-1010
2018-11-01
6 pages
Article (Journal)
Electronic Resource
English
road network efficiency improvement , optimal discrete‐time action selection problems , traffic fluctuations , artificial intelligence , VISSIM software , neural nets , value‐based deep reinforcement learning , model‐free technique , road traffic , traffic engineering computing , traffic arrival patterns , iterative methods , dynamic programming , traffic arrival rates , adaptive isolated intersection signal control , smart city , dynamic discount factor , biased action‐value function estimation , variable green time , deep Q‐learning neural network , learning (artificial intelligence) , machine learning‐based framework , modern city , advanced traffic signal control methods , iterative Bellman equation , intelligent transportation systems
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