crfsuite 0.3.2

Safe wrapper of crfsuite
Documentation 
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extern crate crfsuite;

use crfsuite::{Algorithm, Attribute, CrfError, GraphicalModel, Model, Trainer};

#[test]
fn test_trainer_default_impl() {
    let mut trainer = Trainer::default();
    let ret = trainer.train("tests/test.crfsuite", 1i32);
    assert_eq!(ret.err(), Some(CrfError::AlgorithmNotSelected));
}

#[test]
fn test_trainer_train_uninitialized() {
    let mut trainer = Trainer::default();
    let ret = trainer.train("tests/test.crfsuite", 1i32);
    assert_eq!(ret.err(), Some(CrfError::AlgorithmNotSelected));
}

#[test]
fn test_trainer_train_empty_data() {
    let mut trainer = Trainer::default();
    trainer
        .select(Algorithm::LBFGS, GraphicalModel::CRF1D)
        .unwrap();
    let ret = trainer.train("tests/test.crfsuite", -1i32);
    assert_eq!(ret.err(), Some(CrfError::EmptyData));
}

#[test]
fn test_train_and_tag() {
    let xseq = vec![
        vec![Attribute::new("walk", 1.0), Attribute::new("shop", 0.5)],
        vec![Attribute::new("walk", 1.0)],
        vec![Attribute::new("walk", 1.0), Attribute::new("clean", 0.5)],
        vec![Attribute::new("shop", 0.5), Attribute::new("clean", 0.5)],
        vec![Attribute::new("walk", 0.5), Attribute::new("clean", 1.0)],
        vec![Attribute::new("clean", 1.0), Attribute::new("shop", 0.1)],
        vec![Attribute::new("walk", 1.0), Attribute::new("shop", 0.5)],
        vec![],
        vec![Attribute::new("clean", 1.0)],
    ];
    let yseq = [
        "sunny", "sunny", "sunny", "rainy", "rainy", "rainy", "sunny", "sunny", "rainy",
    ];
    let mut trainer = Trainer::new(true);
    trainer
        .select(Algorithm::LBFGS, GraphicalModel::CRF1D)
        .unwrap();
    trainer.append(&xseq, &yseq, 0i32).unwrap();
    trainer.train("tests/test.crfsuite", -1i32).unwrap();
    drop(trainer);

    // tag
    let model = Model::from_file("tests/test.crfsuite").unwrap();
    let mut tagger = model.tagger().unwrap();
    let res = tagger.tag(&xseq).unwrap();
    assert_eq!(res, yseq);
}

#[test]
fn test_clear_empty() {
    let mut trainer = Trainer::default();
    trainer
        .select(Algorithm::LBFGS, GraphicalModel::CRF1D)
        .unwrap();
    trainer.clear().unwrap();
}

#[test]
fn test_clear_not_empty() {
    let xseq = vec![vec![
        Attribute::new("walk", 1.0),
        Attribute::new("shop", 0.5),
    ]];
    let yseq = ["sunny"];
    let mut trainer = Trainer::default();
    trainer
        .select(Algorithm::LBFGS, GraphicalModel::CRF1D)
        .unwrap();
    trainer.append(&xseq, &yseq, 0i32).unwrap();
    trainer.clear().unwrap();
}

#[test]
fn test_params() {
    let mut trainer = Trainer::default();
    trainer
        .select(Algorithm::LBFGS, GraphicalModel::CRF1D)
        .unwrap();
    let params = trainer.params();
    assert!(params.contains(&"c1".to_string()));
    assert!(params.contains(&"c2".to_string()));
    assert!(params.contains(&"num_memories".to_string()));

    trainer
        .select(Algorithm::L2SGD, GraphicalModel::CRF1D)
        .unwrap();
    let params = trainer.params();
    assert!(!params.contains(&"c1".to_string()));
    assert!(params.contains(&"c2".to_string()));
}

#[test]
fn test_help() {
    let mut trainer = Trainer::default();
    trainer
        .select(Algorithm::LBFGS, GraphicalModel::CRF1D)
        .unwrap();
    let msg = trainer.help("c1").unwrap();
    assert!(msg.contains("L1"));

    trainer
        .select(Algorithm::L2SGD, GraphicalModel::CRF1D)
        .unwrap();
    let msg = trainer.help("c2").unwrap();
    assert!(msg.contains("L2"));
}

#[test]
fn test_help_invalid_argument() {
    let mut trainer = Trainer::default();
    trainer
        .select(Algorithm::LBFGS, GraphicalModel::CRF1D)
        .unwrap();
    let ret = trainer.help("foo");
    match ret.err().unwrap() {
        CrfError::ParamNotFound(_) => {}
        _ => panic!("test fail"),
    }
}

#[test]
fn test_get() {
    let mut trainer = Trainer::default();
    trainer
        .select(Algorithm::L2SGD, GraphicalModel::CRF1D)
        .unwrap();
    trainer.get("c2").unwrap();
}

#[test]
fn test_get_invalid_argument() {
    let mut trainer = Trainer::default();
    trainer
        .select(Algorithm::L2SGD, GraphicalModel::CRF1D)
        .unwrap();
    let ret = trainer.get("foo");
    match ret.err().unwrap() {
        CrfError::ParamNotFound(_) => {}
        _ => panic!("test fail"),
    }
}

#[test]
fn test_set() {
    let mut trainer = Trainer::default();
    trainer
        .select(Algorithm::L2SGD, GraphicalModel::CRF1D)
        .unwrap();
    let before = trainer.get("c2").unwrap();
    trainer.set("c2", "0.5").unwrap();
    let after = trainer.get("c2").unwrap();
    assert!(before != after);
}

#[test]
fn test_set_invalid_argument() {
    let mut trainer = Trainer::default();
    trainer
        .select(Algorithm::L2SGD, GraphicalModel::CRF1D)
        .unwrap();
    let ret = trainer.set("foo", "1.0");
    match ret.err().unwrap() {
        CrfError::ParamNotFound(_) => {}
        _ => panic!("test fail"),
    }
}