foxhunt/ml/tests/ppo_param_conversion_test.rs

use ml::hyperopt::adapters::ppo::PPOParams;
use ml::hyperopt::traits::ParameterSpace;

#[test]
fn test_from_continuous_6_params() {
    let x = vec![
        1e-6_f64.ln(),   // policy_lr
        0.001_f64.ln(),  // value_lr
        0.2,             // clip_epsilon
        1.0,             // value_loss_coeff
        0.01_f64.ln(),   // entropy_coeff
        128.0,           // minibatch_size
    ];
    
    let params = PPOParams::from_continuous(&x).unwrap();
    assert_eq!(params.minibatch_size, 128);
}

#[test]
fn test_from_continuous_rejects_5_params() {
    let x = vec![1e-6_f64.ln(), 0.001_f64.ln(), 0.2, 1.0, 0.01_f64.ln()];
    assert!(PPOParams::from_continuous(&x).is_err());
}

#[test]
fn test_to_continuous_returns_6_values() {
    let params = PPOParams::default();
    let continuous = params.to_continuous();
    assert_eq!(continuous.len(), 6);
}

#[test]
fn test_roundtrip_conversion() {
    let original = PPOParams {
        policy_learning_rate: 1e-6,
        value_learning_rate: 0.002,
        clip_epsilon: 0.15,
        value_loss_coeff: 1.5,
        entropy_coeff: 0.02,
        minibatch_size: 192,
    };
    
    let continuous = original.to_continuous();
    let reconstructed = PPOParams::from_continuous(&continuous).unwrap();
    
    assert_eq!(reconstructed.minibatch_size, 192);
    assert!((reconstructed.policy_learning_rate - 1e-6).abs() < 1e-9);
}

#[test]
fn test_param_names_has_6_entries() {
    let names = PPOParams::param_names();
    assert_eq!(names.len(), 6);
    assert_eq!(names[5], "minibatch_size");
}

#[test]
fn test_minibatch_size_clamped_to_vram_limits() {
    // Test lower bound
    let x = vec![1e-6_f64.ln(), 0.001_f64.ln(), 0.2, 1.0, 0.01_f64.ln(), 32.0];
    let params = PPOParams::from_continuous(&x).unwrap();
    assert_eq!(params.minibatch_size, 64); // Clamped to lower bound
    
    // Test upper bound
    let x = vec![1e-6_f64.ln(), 0.001_f64.ln(), 0.2, 1.0, 0.01_f64.ln(), 500.0];
    let params = PPOParams::from_continuous(&x).unwrap();
    assert_eq!(params.minibatch_size, 230); // Clamped to upper bound
}