Crate bayespam

bayespam

A simple bayesian spam classifier.

About

Bayespam is inspired by Naive Bayes classifiers, a popular statistical technique of e-mail filtering.

Here, the message to be identified is cut into simple words, also called tokens. That are compared to all the corpus of messages (spam or not), to determine the frequency of different tokens in both categories.

A probabilistic formula is used to calculate the probability that the message is a spam. When the probability is high enough, the classifier categorizes the message as likely a spam, otherwise as likely a ham. The probability threshold is fixed at 0.8 by default.

Usage

Add to your Cargo.toml manifest:

[dependencies]
bayespam = "1.0.3"

Use a pre-trained model

Add a model.json file to your package root. Then, you can use it to score and identify messages:

extern crate bayespam;

use bayespam::classifier;

fn main() -> Result<(), std::io::Error> {
    // Identify a typical spam message
    let spam = "Lose up to 19% weight. Special promotion on our new weightloss.";
    let is_spam = classifier::identify(spam)?;
    assert!(is_spam);

    // Identify a typical ham message
    let ham = "Hi Bob, can you send me your machine learning homework?";
    let is_spam = classifier::identify(ham)?;
    assert!(!is_spam);

    Ok(())
}

Train your own model

You can train a new model from scratch:

extern crate bayespam;

use bayespam::classifier::Classifier;

fn main() {
    // Create a new classifier with an empty model
    let mut classifier = Classifier::new();

    // Train the classifier with a new spam example
    let spam = "Don't forget our special promotion: -30% on men shoes, only today!";
    classifier.train_spam(spam);

    // Train the classifier with a new ham example
    let ham = "Hi Bob, don't forget our meeting today at 4pm.";
    classifier.train_ham(ham);

    // Identify a typical spam message
    let spam = "Lose up to 19% weight. Special promotion on our new weightloss.";
    let is_spam = classifier.identify(spam);
    assert!(is_spam);

    // Identify a typical ham message
    let ham = "Hi Bob, can you send me your machine learning homework?";
    let is_spam = classifier.identify(ham);
    assert!(!is_spam);
}

Modules

classifier