השוואת שיטות

	שיטות גרדיאנט מדיניות	למידת חיזוק עמוקה
תחום	למידת מכונה	למידה עמוקה
משפחה	Machine learning	Machine learning
שנת המקור	1992	2015
הוגה השיטה	Ronald Williams (REINFORCE); Sutton et al. (policy gradient theorem)	Mnih, V. et al. (DQN)
סוג	Policy-based reinforcement learning	Sequential decision-making (agent–environment interaction)
מקור מכונן	Williams, R. J. (1992). Simple statistical gradient-following algorithms for connectionist reinforcement learning. Machine Learning, 8(3–4), 229–256.	Mnih, V. et al. (2015). Human-Level Control through Deep Reinforcement Learning. Nature, 518, 529–533.
כינויים	REINFORCE, actor-critic, policy optimization, politika gradyanı	Derin Pekiştirmeli Öğrenme (DQN / PPO / A3C), derin pekiştirmeli öğrenme, deep RL, DRL
קשורות	4	4
תקציר	Policy gradient methods are reinforcement-learning algorithms that optimize a parameterized policy directly by gradient ascent on the expected return, rather than learning action-values and acting greedily. Founded on Ronald Williams' 1992 REINFORCE algorithm and the policy gradient theorem of Sutton and colleagues (2000), they naturally handle stochastic and continuous action spaces and underpin modern actor-critic and deep-RL algorithms.	Deep Reinforcement Learning combines neural networks with reinforcement learning so an agent learns by interacting with an environment, popularised by Mnih and colleagues' 2015 Nature work on human-level Atari control. Instead of learning from a fixed labelled dataset, the agent takes actions, observes rewards, and gradually shapes a policy that maximises long-run return.