Deep reinforcement learning rests on three pillars: an agent, an environment, and a reward signal. The agent is the learner — often a deep neural network — that selects actions based on its current state. The environment is everything the agent interacts with, whether it’s a video game, a robotic arm, or a city street. The reward signal serves as the feedback mechanism, telling the agent whether its actions led to desirable outcomes. Through this continuous loop of action, observation, and adaptation, the agent re…
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