8x8 Frozen Lake mit SARSA lösen

In dieser Übung wendest du den SARSA-Algorithmus an und nutzt dabei die Funktion update_q_table(), die du zuvor implementiert hast, um eine optimale Strategie für die 8x8-Variante der Frozen-Lake-Umgebung zu erlernen. Diese Umgebung ist identisch mit der klassischen 4x4-Version, nur eben größer. Du verwendest SARSA, um die Policy des Agenten iterativ anhand der aus der Umgebung erhaltenen Belohnungen zu verbessern.

Eine Q-Tabelle Q wurde für dich initialisiert und vorab geladen, zusammen mit der Funktion update_q_table() aus der vorherigen Übung.

Diese Übung ist Teil des Kurses

Reinforcement Learning mit Gymnasium in Python

Anleitung zur Übung

Führe für jede Episode im Trainingsprozess die gewählte action aus.
Wähle die next_action zufällig.
Aktualisiere die Q-Tabelle für den gegebenen state und die action.

Interaktive Übung

Vervollständige den Beispielcode, um diese Übung erfolgreich abzuschließen.

for episode in range(num_episodes):
    state, info = env.reset()
    action = env.action_space.sample()
    terminated = False
    while not terminated:
      	# Execute the action
        next_state, reward, terminated, truncated, info = ____
        # Choose the next action randomly
        next_action = ____
        # Update the Q-table
        ____
        state, action = next_state, next_action   
render_policy(get_policy())

Code bearbeiten und ausführen

Diese Übung ist Teil des Kurses

Reinforcement Learning mit Gymnasium in Python

Hohe SchwierigkeitSchwierigkeitsgrad

4.8+

Kurs kostenlos starten

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 Decision Processes Exercise 2: Custom Frozen Lake MDP components Exercise 3: Exploring state and action spaces Exercise 4: Transition probabilities and rewards Exercise 5: Policies and state-value functions Exercise 6: Defining a deterministic policy Exercise 7: Computing state-values for a policy Exercise 8: Comparing policies Exercise 9: Action-value functions Exercise 10: Computing Q-values Exercise 11: Improving a policy Exercise 12: Policy iteration and value iteration Exercise 13: Applying policy iteration for optimal policy Exercise 14: Implementing value iteration

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-Methoden Exercise 2: Episodenerzeugung für Monte-Carlo-Methoden Exercise 3: First-Visit Monte Carlo implementieren Exercise 4: Every-Visit Monte Carlo implementieren Exercise 5: Temporal-Differenzen-Lernen Exercise 6: Die SARSA-Aktualisierungsregel implementieren Exercise 7: 8x8 Frozen Lake mit SARSA lösen

Aktuelle Übung

Exercise 8: Q-Learning Exercise 9: Q-Learning-Aktualisierungsregel implementieren Exercise 10: 8x8 Frozen Lake mit Q-Learning lösen Exercise 11: Richtlinie auf einem rutschigen Frozen Lake evaluieren

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!