Bir politikayı iyileştirme

Önceki egzersizde, MyGridWorld ortamındaki her durum-eylem çifti için Q-değerlerini hesaplattın. Şimdi bu Q-değerlerini mevcut politikayı iyileştirmek için kullanacaksın. Politika iyileştirme, reinforcement learning'de kritik bir adımdır; her durumda beklenen faydayı (Q-değeri) en çoklayan eylemleri seçerek politikayı geliştirirsin. Politikayı iyileştirdikten sonra, bu geliştirilmiş politikaya göre yeni hareketleri görselleştireceksin.

Ortam env olarak, Q-değerleri Q olarak ve render() fonksiyonu birlikte içe aktarılmıştır.

Bu egzersiz

Python ile Gymnasium'da Reinforcement Learning

kursunun bir parçasıdır

Kursu Görüntüle

Egzersiz talimatları

Q-değerlerine göre her durum için en iyi eylemi bul.
improved_policy'ye göre doğru action'ı seç.
Sonucunu gözlemlemek için seçilen action'ı yürüt.

Uygulamalı interaktif egzersiz

Bu örnek kodu tamamlayarak bu egzersizi bitirin.

improved_policy = {}

for state in range(num_states-1):
    # Find the best action for each state based on Q-values
    max_action = ____
    improved_policy[state] = max_action

terminated = False
while not terminated:
  # Select action based on policy 
  action = ____
  # Execute the action
  state, reward, terminated, truncated, info = ____
  render()

Kodu Düzenle ve Çalıştır

Bu egzersiz

Python ile Gymnasium'da Reinforcement Learning

kursunun bir parçasıdır

AvançadoNível de habilidade

4.8+

Kursa Ücretsiz Başlayın

Dive into the exciting world of Reinforcement Learning (RL) by exploring its foundational concepts, roles, and applications. Navigate through the RL framework, uncovering the agent-environment interaction. You'll also learn how to use the Gymnasium library to create environments, visualize states, and perform actions, thus gaining a practical foundation in RL concepts and applications.

Exercise 1: Fundamentals of reinforcement learning Exercise 2: What is Reinforcement Learning?Exercise 3: RL vs. other ML sub-domains Exercise 4: Scenarios for applying RL Exercise 5: Navigating the RL framework Exercise 6: RL interaction loop Exercise 7: Episodic and continuous RL tasks Exercise 8: Calculating discounted returns for agent strategies Exercise 9: Interacting with Gymnasium environments Exercise 10: Setting up a Mountain Car environment Exercise 11: Visualizing the Mountain Car Environment Exercise 12: Interacting with the Frozen Lake environment

Delve deeper into the world of RL focusing on model-based learning. Unravel the complexities of Markov Decision Processes (MDPs), understanding their essential components. Enhance your skill set by learning about policies and value functions. Gain expertise in policy optimization with policy iteration and value Iteration techniques.

Exercise 1: Markov Karar Süreçleri Exercise 2: Özel Frozen Lake MDP bileşenleri Exercise 3: Durum ve eylem uzaylarını keşfetme Exercise 4: Geçiş olasılıkları ve ödüller Exercise 5: Politikalar ve durum-değer fonksiyonları Exercise 6: Deterministik bir politika tanımlama Exercise 7: Bir politika için durum-değerlerini hesaplama Exercise 8: Politikaları karşılaştırma Exercise 9: Eylem-değer fonksiyonları Exercise 10: Q-değerlerini hesaplama Exercise 11: Bir politikayı iyileştirme

Geçerli Egzersiz

Exercise 12: Politika yinelemesi ve değer yinelemesi Exercise 13: En iyi politikayı bulmak için policy iteration uygulama Exercise 14: Değer yinelemesini (value iteration) uygulama

Embark on a journey through the dynamic realm of Model-Free Learning in RL. Get introduced to to the foundational Monte Carlo methods, and apply first-visit and every-visit Monte Carlo prediction algorithms. Transition into the world of Temporal Difference Learning, exploring the SARSA algorithm. Finally, dive into the depths of Q-Learning, and analyze its convergence in challenging environments.

Exercise 1: Monte Carlo methods Exercise 2: Episode generation for Monte Carlo methods Exercise 3: Implementing first-visit Monte Carlo Exercise 4: Implementing every-visit Monte Carlo Exercise 5: Temporal difference learning Exercise 6: Implementing the SARSA update rule Exercise 7: Solving 8x8 Frozen Lake with SARSA Exercise 8: Q-learning Exercise 9: Implementing Q-learning update rule Exercise 10: Solving 8x8 Frozen Lake with Q-learning Exercise 11: Evaluating policy on a slippery Frozen Lake

Dive into advanced strategies in Model-Free RL, focusing on enhancing decision-making algorithms. Learn about Expected SARSA for more accurate policy updates and Double Q-learning to mitigate overestimation bias. Explore the Exploration-Exploitation Tradeoff, mastering epsilon-greedy and epsilon-decay strategies for optimal action selection. Tackle the Multi-Armed Bandit Problem, applying strategies to solve decision-making challenges under uncertainty.

Exercise 1: Expected SARSA Exercise 2: Expected SARSA update rule Exercise 3: Applying Expected SARSA Exercise 4: Double Q-learning Exercise 5: Implementing double Q-learning update rule Exercise 6: Applying double Q-learning Exercise 7: Balancing exploration and exploitation Exercise 8: Defining epsilon-greedy function Exercise 9: Solving CliffWalking with epsilon greedy strategy Exercise 10: Solving CliffWalking with decayed epsilon-greedy strategy Exercise 11: Multi-armed bandits Exercise 12: Creating a multi-armed bandit Exercise 13: Solving a multi-armed bandit Exercise 14: Assessing convergence in a multi-armed bandit Exercise 15: Congratulations!