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Observational Learning01:12

Observational Learning

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Albert Bandura's observational learning, also known as imitation or modeling, occurs when a person observes and imitates another's behavior. It is a quicker process than operant conditioning. A well-known example is the Bobo doll study, where children who saw an adult acting aggressively towards the doll were more likely to act aggressively when left alone, compared to those who observed a nonaggressive adult. Many psychologists view observational learning as a form of latent learning...
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Multi-Step Reactions02:31

Multi-Step Reactions

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Chemical reactions often occur in a stepwise fashion involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs. Each of the steps in a reaction mechanism is called an elementary reaction. These...
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Reinforcement01:23

Reinforcement

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Positive and negative reinforcement are key concepts in operant conditioning, a learning process where the consequences of a behavior affect the likelihood of that behavior being repeated.
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Reinforcements in Concrete01:25

Reinforcements in Concrete

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Reinforced concrete is a composite material used extensively in construction, combining the compressive strength of concrete with the tensile strength of steel. This synergy is essential as concrete, while excellent at resisting compression, is weak under tension. Steel bars, or rebars, are embedded in the concrete to handle these tensile forces. The choice of steel is strategic; it shares a similar coefficient of thermal expansion with concrete, which ensures uniformity in response to...
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Corrosion of Reinforcement01:27

Corrosion of Reinforcement

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The corrosion of steel reinforcement within concrete is a process influenced by the material's inherent properties and external factors. The high pH level of around 13, provided by calcium hydroxide present in concrete, initially protects the steel reinforcement by promoting the formation of a passive iron oxide layer on its surface.
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
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Reinforcement Schedules01:24

Reinforcement Schedules

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Positive reinforcement is a powerful method for teaching new behaviors to both animals and humans. B.F. Skinner demonstrated this with his experiments using rats in a Skinner box. When a rat pressed a lever, it received a food pellet. This immediate reward encouraged the rat to repeat the behavior. This method, where a reward follows every instance of the behavior, is known as continuous reinforcement. It is highly effective for establishing new behaviors quickly.
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部分観測下での頑健な連続制御のための軽量深層強化学習戦略:複数ステップの導入

Lingheng Meng1, Rob Gorbet2, Michael Burke3

  • 1Electrical and Computer Engineering, University of Waterloo, 200 University Avenue West, Waterloo, N2L 3G1, ON, Canada; Electrical and Computer Systems Engineering, Monash University, 18 Alliance Lane, Clayton, 3800, VIC, Australia; Data61, CSIRO, Research Way, Calyton, 3168, VIC, Australia.

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PubMed
まとめ
この要約は機械生成です。

プロキシマル方策最適化(PPO)は、ツイン遅延型深層決定方策勾配(TD3)およびソフトアクタークリティック(SAC)と比較して、部分観測環境においてより高い頑健性を示す。PPOにおける複数ステップブートストラップおよびTD3/SACへの適応は、これらの困難な設定における性能を向上させる。

キーワード:
深層強化学習複数ステップ法部分観測マルコフ決定過程ロボット学習

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科学分野:

  • ロボット工学および人工知能
  • 機械学習および制御理論

背景:

  • 深層強化学習(DRL)は、完全に観測可能なマルコフ決定過程(MDP)で優れた性能を発揮する。
  • 部分観測マルコフ決定過程(POMDP)では、不完全な状態情報のために性能のダイナミクスが変化する。
  • 既存のDRLベンチマークはMDPに焦点を当てることが多く、POMDPの性能はあまり理解されていない。

研究 の 目的:

  • 連続制御タスクのPOMDPバリアントでPPO、TD3、SACアルゴリズムを経験的に比較すること。
  • 主要なDRLアルゴリズムの相対的な性能に対する部分観測の影響を調査すること。
  • POMDP設定における頑健性を向上させるアルゴリズムの適応を特定すること。

主な方法:

  • プロキシマル方策最適化(PPO)、ツイン遅延型深層決定方策勾配(TD3)、およびソフトアクタークリティック(SAC)の比較分析。
  • 標準的な連続制御ベンチマークの代表的なPOMDP定式化での評価。
  • PPOへの複数ステップブートストラップおよびTD3(MTD3)およびSAC(MSAC)への複数ステップターゲットの導入。

主要な成果:

  • PPOは、部分観測下で、通常のMDPの結果とは対照的に、優れた頑健性と性能を示した。
  • TD3およびSACは、MDPの対応物と比較して、POMDPにおいて性能が低下した。
  • 複数ステップターゲットを持つ修正TD3(MTD3)およびSAC(MSAC)は、POMDPにおいて改善された頑健性を示した。

結論:

  • 部分観測はDRLアルゴリズムの性能に大きく影響し、通常のランキングを逆転させる。
  • PPOの固有の複数ステップブートストラップは、POMDPにおいて安定化の利点を提供する。
  • 複数ステップターゲットを持つTD3およびSACのようなアルゴリズムの適応は、部分観測環境におけるそれらの頑健性を向上させるための実用的な方法を提供する。