49 results about "Inverse reinforcement learning" patented technology

A powertrain of a hybrid electric vehicle (HEV) is controlled. A first value α₁ and a second value α₂ are determined, α₁ represents a proportion of an instantaneous power requirement (P_req) supplied by an engine of the HEV. α₂ controls a recharging rate of a battery of the HEV. A determination is performed, based on α₁ and α₂, regarding how much engine power to use (P_eng) and how much battery power to use (P_batt). P_eng and P_batt are sent to the powertrain.

The invention relates to an automatic driving system based on relative-entropy deep and inverse reinforcement learning. The system comprises a client, a driving basic data collection sub-system and astorage module, wherein the client displays a driving strategy; the driving basic data collection sub-system collects road information; the storage module is connected with the client and the drivingbasic data collection sub-system and stores the road information collected by the driving basic data collection sub-system. The driving basic data collection sub-system collects the road information and transmits the road information to the client and the storage module; the storage module receives the road information, stores a piece of continuous road information into a historical route, conducts analysis and calculation according to the historical route so as to simulate the driving strategy, and transmits the driving strategy to the client so that a user can select the driving strategy; the client receives the road information and implements automatic driving according to the selection of the user. In the automatic driving system, the relative-entropy deep and inverse reinforcement learning algorithm is adopted, so that automatic driving under the model-free condition is achieved.

The invention discloses a robot imitation learning method based on virtual scene training. The method comprises the following steps: designing a robot model and a virtual interaction environment according to a specific task; collecting and arranging an expert data set; determining a state value space S and an action value space A according to the specific task, and determining structures of the network of a strategy generator and the network of a discriminator according to the state value space S and the action value space A; sampling data from the strategy generator, designing a parameter updating strategy, and alternately training the strategy generator and the discriminator by combining the expert data set and adopting an adversarial training method until the discriminator converges toa saddle point; and testing a network model composed of the strategy generator and the discriminator obtained by training, and taking a real environment state as input of the strategy generator so asto obtain action output. According to the method, a value return function is judged and learned; a large number of complex intermediate steps of inverse reinforcement learning with high calculation amount are bypassed; and the learning process is simpler and more efficient.

A method is provided for rule creation that includes receiving (i) a MDP model with a set of states, a set of actions, and a set of transition probabilities, (ii) a policy that corresponds to rules for a rule engine, and (iii) a set of candidate states that can be added to the set of states. The method includes transforming the MDP model to include a reward function using an inverse reinforcement learning process on the MDP model and on the policy. The method includes finding a state from the candidate states, and generating a refined MDP model with the reward function by updating the transition probabilities related to the state. The method includes obtaining an optimal policy for the refined MDP model with the reward function, based on the reward policy, the state, and the updated probabilities. The method includes updating the rule engine based on the optimal policy.

The invention discloses an improved Bayesian inverse reinforcement learning method based on combined feedback, and provides an interactive learning method combining expert feedback and demonstration,in an LfF, an expert evaluates the behavior of a learner and gives feedback with different rewards, so as to improve the strategy of the learner. In the LfD, the Agent attempts to learn its policy byobserving expert demonstration. The research algorithm of the method is divided into three learning stages: learning is carried out from non-optimal demonstration; learning from the feedback; demonstration and feedback learning; to reduce states requiring iteration According to the number of actions, the Agent strategy is improved through iteration of the graphical Bayesian rule to enhance the learned reward function, and the speed of finding the optimal action is increased.

A method of inverse reinforcement learning for estimating reward and value functions of behaviors of a subject includes: acquiring data representing changes in state variables that define the behaviors of the subject; applying a modified Bellman equation given by Eq. (1) to the acquired data:

where r(x) and V(x) denote a reward function and a value function, respectively, at state x, and γ represents a discount factor, and b(y|x) and π(y|x) denote state transition probabilities before and after learning, respectively; estimating a logarithm of the density ratio π(x)/b(x) in Eq. (2); estimating r(x) and V(x) in Eq. (2) from the result of estimating a log of the density ratio π(x,y)/b(x,y); and outputting the estimated r(x) and V(x).

A method is provided for rule creation that includes receiving (i) a MDP model with a set of states, a set of actions, and a set of transition probabilities, (ii) a policy that corresponds to rules for a rule engine, and (iii) a set of candidate states that can be added to the set of states. The method includes transforming the MDP model to include a reward function using an inverse reinforcement learning process on the MDP model and on the policy. The method includes finding a state from the candidate states, and generating a refined MDP model with the reward function by updating the transition probabilities related to the state. The method includes obtaining an optimal policy for the refined MDP model with the reward function, based on the reward policy, the state, and the updated probabilities. The method includes updating the rule engine based on the optimal policy.

Systems and methods for automatic generation of robot control policies include a CAD-based simulation engine for simulating CAD-based trajectories for the robot based on cost function parameters, a demonstration module configured to record demonstrative trajectories of the robot, an optimization engine for optimizing a ratio of CAD-based trajectories to demonstrative trajectories based on computation resource limits, a cost learning module for learning cost functions by adjusting the cost function parameters using a minimized divergence between probability distribution of CAD-based trajectories and demonstrative trajectories; and a deep inverse reinforcement learning engine for generating robot control policies based on the learned cost functions.

In example embodiments, a method of interactive imitation learning method is disclosed. An input is received from an input device. The input includes data describing a first set of example actions defining a behavior for a virtual character. Inverse reinforcement learning is used to estimate a reward function for the set of example actions. The reward function and the set of example actions is used as input to a reinforcement learning model to train a machine learning agent to mimic the behavior in a training environment. Based on a measure of failure of the training of the machine learning agent reaching a threshold, the training of the machine learning agent is paused to request a second set of example actions from the input device. The second set of example actions is used in addition to the first set of example actions to estimate a new reward function.

The invention discloses a traffic organization scheme optimization method based on multi-agent reinforcement learning, and the method comprises the steps: improving an Actor network in MADDPG, improving an experience library in a Critic network based on a birth and death process, employing the maximum traffic flow at an early peak as an agent return index, training a maximum entropy inverse reinforcement learning model by using trajectory data to serve as a multi-agent return mechanism, and designing a return function of reinforcement learning based on the return mechanism. According to the method, the current urban traffic organization scheme is optimized, the current traffic data are analyzed to find out the cause of traffic jam, the method can well adapt to and quickly find out the optimal scheme, traffic guidance suggestions are provided for traffic police experts, and a foundation is laid for a smart city.

The invention discloses an automatic testing method and device, and relates to the technical field of computers. A specific embodiment of the method comprises the following steps: collecting decisiontrack data of a tester during testing, and taking the decision track data as an expert strategy; Creating a model of a reward function; taking the expert strategy as an input of an inverse reinforcement learning algorithm to obtain a return coefficient enabling the value of the reward function to be maximum; and according to the reward function corresponding to the maximum return coefficient, calculating a strategy corresponding to the maximum cumulative reward function value so as to carry out an automatic test according to the strategy. According to the implementation mode, the reward function is designed through the inverse reinforcement learning algorithm, then the strategy corresponding to the expert strategy is obtained, automatic testing is carried out according to the strategy, onone hand, testing resources are saved, and on the other hand, the testing depth and the coverage range can be close to the testing effect of a tester.

The invention belongs to the technical field of intelligent driving, and discloses a vehicle following system and method for simulating a driving style based on deep inverse reinforcement learning. The vehicle following system comprises a millimeter-wave radar which collects the information of the distance between a vehicle and a front vehicle, the lateral distance between the vehicle and the front vehicle, the relative speed and the azimuth angle, a vehicle speed collection device which collects the speed of the vehicle, and a vehicle-mounted industrial personal computer. A vehicle followingdata processor in the vehicle-mounted industrial personal computer processes information acquired by the millimeter wave radar and the vehicle speed collection device, extracts a vehicle following data fragment required by vehicle following model training, and performs vehicle following model training on the vehicle following data fragment to obtain a vehicle following strategy model; the vehiclefollowing system is simple in structure, a reward function is learned from the historical vehicle following data of a driver through the deep inverse reinforcement learning method, the vehicle following strategy of the driver is solved through the reward function and the reinforcement learning method, the obtained vehicle following model can simulate the driving styles of different drivers and understand the preference of the driver in the vehicle following process, and a personified vehicle following behavior is generated.

The invention discloses a problem generation method and device, and the method comprises the steps: taking an original problem sample and a target problem sample as training samples, and carrying outthe inverse reinforcement learning training of a discriminator composed of a machine reading model and a scoring function, wherein the target problem sample is a semantic similarity problem generatedby inputting the original problem sample into a problem generation model; and taking the overlap ratio score output by the scoring function as a return; taking the original problem sample as a training sample, and carrying out reinforcement learning training on a generator formed by the problem generation model, so as to further form adversarial training between the generator and the discriminator and taking the target problem sample as an adversarial sample corresponding to the original problem sample, wherein the problem generation model after adversarial training can be used for generatingtarget problems with similar semantics.

The invention belongs to the technical field of artificial intelligence, and discloses a generative adversarial interactive imitation learning method and system, a storage medium and application, the generative adversarial interactive imitation learning method combines generative adversarial interactive imitation learning and an interactive learning framework to form generative adversarial interactive imitation learning GA2IL; the GA2IL is composed of two stages: (1) a GAIL-like stage based on maximum entropy inverse reinforcement learning; and (2) an interactive reinforcement learning stage. The GA2IL intelligent agent can surpass the performance of expert demonstration and obtain the optimal or near-optimal strategy under the condition that expert demonstration is optimal or suboptimal, the stability of the strategy can be improved, and the GA2IL intelligent agent can be expanded to large-scale complex tasks. According to the method, under the condition that whether optimal expert demonstration or suboptimal expert demonstration is given, the GA2IL intelligent agent can always surpass the performance of expert demonstration and can obtain an optimal strategy or a strategy close to the optimal strategy.

Systems and method are provided for controlling a vehicle. In one embodiment, a vehicle includes: one or more onboard sensing devices, one or more onboard actuators, and a controller that, by a processor, obtains sensor data from the one or more sensing devices, identifies an assistance event based at least in part on the sensor data, determines an automated response to the assistance event basedat least in part on the sensor data and an autonomous assistance policy, and autonomously operates the one or more actuators onboard the vehicle in accordance with the automated response. In exemplaryembodiments, the autonomous assistance policy is determined using inverse reinforcement learning to optimize a reward function and mimic a remote human assistor.

The invention relates to a mobile robot navigation method and device, computer equipment and a storage medium. The method comprises the following steps of: extracting features of a target point image and a scene image through a feature extraction module to obtain state features of a current state; resolving a preset expert track through an inverse reinforcement learning module to obtain a reward function; outputting a predicted execution action of a robot through a strategy network in an A3C reinforcement learning network, obtaining a predicted value function through a value network, and after the execution action obtains a next state, calculating a TD error according to the current state, the next state and the execution action to obtain a first loss function; obtaining an expert reward value according to the state features and a weight parameter, and obtaining a second loss function according to the network reward value and the expert reward value; and training the A3C reinforcement learning network and a reward network to obtain a trained mobile robot navigation model for navigation. According to the invention, the accuracy and efficiency of indoor navigation of the robot can be improved, and the generalization ability is high.

The invention relates to a method (200) for using machine learning to determine control parameters (thetaj) for a control system (100), in particular a control system (100) of a motor vehicle (110), in particular a control system (100) for controlling a driving operation of the motor vehicle (110). The method (200)includes: providing (210) travel trajectories (D); deriving (220) reward functions (Rj) from the travel trajectories (D), using an inverse reinforcement learning method; deriving (230) driver type-specific clusters (Cj) based on the reward functions (Rj); determining (240) control parameters (thetaj) for a particular driver type-specific cluster (cj).

The invention provides a carrier rocket load shedding control method based on inverse reinforcement learning. The carrier rocket load shedding control method comprises the following specific steps: 1, establishing a carrier rocket dynamic model considering a wind field condition; 2, generating a passive load shedding expert demonstration; 3, training an inverse reinforcement learning load shedding control strategy; and 4, migrating the load shedding controller, that is, load shedding control strategy network parameters obtained through training are solidified, a closed loop is achieved through input and output interfaces of carrier rocket dynamics, and the load shedding controller serves as the load shedding controller. Through the above steps, the method can achieve the load shedding control of the carrier rocket, solves a problem that the existing method depends on precise wind field information and cannot guarantee the guidance precision, and achieves better stability and universality. The guidance control method is scientific and good in manufacturability and has wide application and popularization value.

The embodiment of the invention provides an inverse reinforcement learning processing method and device, a storage medium and an electronic device, and the method comprises the steps of obtaining a target demonstration track which is provided by taking a target state in a preset state candidate set as an initial state; adding the target demonstration track into the initialized demonstration set to obtain an updated demonstration set; and performing inverse reinforcement learning training according to the updated demonstration set to obtain a target strategy meeting a preset condition. According to the invention, the problem of high cost caused by a large number of expert demonstration due to the need of collecting a large number of expert demonstration in inverse reinforcement learning in related technologies can be solved; comprising selecting a most valuable state (a target state with a maximum contribution value) from a state candidate set as an initial state; obtaining a demonstration track taking the target state as an initial state; and updating the demonstration set, and training a strategy according to the updated demonstration set, thereby achieving the purpose of reducing the demonstration cost.

The invention discloses an automatic driving method and device, electronic equipment and a computer readable storage medium. The method comprises the steps that multi-mode sensing information and driving behavior data of a driving environment are acquired; extracting multi-scale features of the multi-modal perception information by using a convolutional neural network, and fusing the multi-scale features by using Transform to obtain fused feature data; the fusion feature data and the driving behavior data are combined into expert demonstration data, and an automatic driving process is modeled into a Markov decision process; obtaining a reward function of an automatic driving process by using expert demonstration data and maximum entropy inverse reinforcement learning, and optimizing a driving strategy model by using deep reinforcement learning; and outputting the optimized driving strategy model to the client, so that the client realizes automatic driving by using the optimized driving strategy model according to the environmental perception information. The reliability of automatic driving perception data is ensured, and the reasonability of decision planning in the automatic driving process is improved.

The invention discloses a server-free computing resource allocation method, device and equipment based on maximum entropy inverse reinforcement learning and a storage medium thereof. The method comprises the steps that an intelligent agent randomly generates a preset strategy; comparing the data obtained by sampling the preset strategy with the data obtained by sampling the expert data, and learning a reward function; carrying out reinforcement learning by utilizing the learned reward function to obtain a reinforced self-strategy; and judging the difference of the own strategies, and stopping comparison when the difference of the own strategies is smaller than a threshold value. According to the scheme provided by the invention, after basic training is completed, the scheme is a completely online learning method, and the training is not needed. According to the invention, the parameters can be dynamically adjusted, and the space of price and income is fully explored, so that the benefits of the user and the platform are maximized.

A method for estimating the reverse reinforcement learning of the reward and value function of the behavior of an object, the method comprising: obtaining data representing changes in a state variable, which defines the behavior of the object; will be given by formula (1) The modified Bellman equation is applied to the acquired data, where r(x) and V(x) represent the reward function and value function in state x, respectively, while γ represents the discount factor, and b(y|x) and π(y |x) respectively represent the state transition probability before and after learning; estimate the logarithm of the density ratio π(x)/b(x) in formula (2); according to the estimated density ratio π(x,y)/b( x, y), estimate r(x) and V(x) in Equation 2; and output the estimated r(x) and V(x).