Menerapkan Expected SARSA

Sekarang Anda akan menerapkan algoritma Expected SARSA dalam sebuah environment kustom seperti di bawah ini, dengan tujuan membuat agen menavigasi grid untuk mencapai target secepat mungkin. Aturan yang sama seperti sebelumnya tetap berlaku: agen menerima reward +10 saat mencapai berlian, -2 saat melewati gunung, dan -1 untuk setiap state lainnya.

Environment telah diimpor sebagai env.

Latihan ini adalah bagian dari kursus

Reinforcement Learning dengan Gymnasium di Python

Petunjuk latihan

Inisialisasi Q-table Q dengan nol untuk setiap pasangan state-action.
Perbarui Q-table menggunakan fungsi update_q_table().
Ekstrak policy sebagai dictionary dari Q-table yang telah dipelajari.

Latihan interaktif praktis

Cobalah latihan ini dengan menyelesaikan kode contoh berikut.

# Initialize the Q-table with random values
Q = ____
for i_episode in range(num_episodes):
    state, info = env.reset()    
    done = False    
    while not done: 
        action = env.action_space.sample()               
        next_state, reward, done, truncated, info = env.step(action)
        # Update the Q-table
        ____
        state = next_state
# Derive policy from Q-table        
policy = {state: ____ for state in range(____)}
render_policy(policy)

Edit dan Jalankan Kode

Latihan ini adalah bagian dari kursus

Reinforcement Learning dengan Gymnasium di Python

SkillTag.level.advancedSkillTag.label

4.8+

Mulai Kursus Gratis

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 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: Aturan pembaruan Expected SARSA Exercise 3: Menerapkan Expected SARSA

Latihan Saat Ini

Exercise 4: Double Q-learning Exercise 5: Menerapkan aturan pembaruan Double Q-learning Exercise 6: Menerapkan Double Q-learning Exercise 7: Menyeimbangkan eksplorasi dan eksploitasi Exercise 8: Mendefinisikan fungsi epsilon-greedy Exercise 9: Menyelesaikan CliffWalking dengan strategi epsilon-greedy Exercise 10: Menyelesaikan CliffWalking dengan strategi epsilon-greedy tereduksi Exercise 11: Multi-armed bandits Exercise 12: Membuat multi-armed bandit Exercise 13: Menyelesaikan multi-armed bandit Exercise 14: Menilai konvergensi pada multi-armed bandit Exercise 15: Selamat!