rlkit 0.0.3

A deep reinforcement learning library based on Rust and Candle, providing complete implementations of Q-Learning and DQN algorithms, supporting custom environments, various policy choices, and flexible training configurations. Future support will include more reinforcement learning algorithms, such as DDPG, PPO, A2C, etc.
Documentation 
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use super::env::*;
use rlkit::algs::{Algorithm, QLearning, TrainArgs};
use rlkit::policies::EpsilonGreedy;

pub fn train_with_q_learning() {
    println!("开始Q-Learning算法测试...");

    // 2. 创建环境
    let size = 50;
    // 设置障碍物密度（0.0-1.0之间，推荐0.2-0.3）
    let obstacle_density = 0.1;
    // 随机生成障碍物
    let obstacles = GridWorld::generate_random_obstacles(size, obstacle_density);
    println!("生成了 {} 个随机障碍物", obstacles.len());
    // 创建包含随机障碍物的环境
    let mut env = GridWorld::new(size, obstacles);

    // 3. 创建Q-Learning算法
    println!("创建Q-Learning算法实例...");
    let mut q_learning = QLearning::new(&env, 10000).unwrap();
    let mut policy = EpsilonGreedy::new(1.0, 0.01, 0.995);

    // 5. 训练前测试未训练模型
    let max_steps = (size * size) as usize;
    let (pre_train_reward, pre_train_steps, pre_train_reached_goal) =
        test_model(&mut q_learning, &mut policy, &mut env, max_steps, "训练前");

    // 6. 配置训练参数
    let train_args = TrainArgs {
        epochs: 1000,
        max_steps,
        batch_size: 64,
        learning_rate: 0.5,
        gamma: 0.99,
        ..Default::default()
    };

    // 7. 训练模型
    println!("\n开始训练模型...");
    if let Err(e) = q_learning.train(&mut env, &mut policy, train_args) {
        println!("训练失败: {}", e);
        return;
    }

    // 8. 重置策略的epsilon值以便测试（可选）
    policy.epsilon = 0.01; // 设置很低的探索率用于测试
    println!("\n测试时设置epsilon值为0.01以减少随机探索");

    // 9. 测试训练后的模型
    let (post_train_reward, post_train_steps, post_train_reached_goal) =
        test_model(&mut q_learning, &mut policy, &mut env, max_steps, "训练后");

    // 10. 比较训练前后的效果
    println!("\n=== 训练前后效果对比 ===");
    println!(
        "训练前总奖励: {:.2}, 训练后总奖励: {:.2}, 提升: {:.2}%",
        pre_train_reward,
        post_train_reward,
        if pre_train_reward != 0.0 {
            (post_train_reward - pre_train_reward) / pre_train_reward.abs() * 100.0
        } else {
            0.0
        }
    );
    println!(
        "训练前步数: {}, 训练后步数: {}, 减少: {} 步 ({:.2}%)",
        pre_train_steps,
        post_train_steps,
        if pre_train_steps > post_train_steps {
            pre_train_steps - post_train_steps
        } else {
            0
        },
        if pre_train_steps != 0 {
            ((pre_train_steps as f32 - post_train_steps as f32) / pre_train_steps as f32).abs() * 100.0
        } else {
            0.0
        }
    );
    println!(
        "训练前是否到达目标: {}, 训练后是否到达目标: {}",
        pre_train_reached_goal, post_train_reached_goal
    );

    println!("\n测试结束");
}