bayespam

A simple bayesian spam classifier.

About

Bayesam is inspired from 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 spam or not. When the probability is high enough, the bayesian system categorizes the message as spam. Otherwise, he lets it pass. The probability threshold is fixed at 0.8 by default.

Usage

Add to your Cargo.toml:

ini [dependencies] bayespam = "0.1.0"

Use the pre-trained model provided

```rust extern crate bayespam;

use bayespam::classifier;

fn main() { // Classify a typical spam message let m1 = String::from("Lose up to 19% weight. Special promotion on our new weightloss."); let score: f32 = classifier::score(&m1); let isspam: bool = classifier::isspam(&m1); println!("{}", score); println!("{}", is_spam);

// Classifiy a typical ham message
let m2 = String::from("Hi Bob, can you send me your machine learning homework?");
let score: f32 = classifier::score(&m2);
let is_spam: bool = classifier::is_spam(&m2);
println!("{}", score);
println!("{}", is_spam);

} ```

bash $> cargo run 0.99974066 true 0.0075160516 false

Train your own model

```rust extern crate bayespam;

use bayespam::classifier::Classifier;

fn main() { // Create a new classifier with an empty model let mut classifier = Classifier::new("mysupermodel.json", true);

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

// Train the model with a new ham example
let ham = String::from("Hi Bob, don't forget our meeting today at 4pm.");
classifier.train(&ham, false);

// Classify a typical spam message
let m1 = String::from("Lose up to 19% weight. Special promotion on our new weightloss.");
let score: f32 = classifier.score(&m1);
let is_spam: bool = classifier.is_spam(&m1);
println!("{}", score);
println!("{}", is_spam);

// Classifiy a typical ham message
let m2 = String::from("Hi Bob, can you send me your machine learning homework?");
let score: f32 = classifier.score(&m2);
let is_spam: bool = classifier.is_spam(&m2);
println!("{}", score);
println!("{}", is_spam);

} ```

bash $> cargo run 0.89681536 true 0.00059083913 false

Save your model

rust classifier.save("my_super_model.json")

bash $> cat my_super_model.json {"spam_count_total":9,"ham_count_total":6,"token_table":{"men":[0,1],"dont":[1,1],"shoes":[0,1],"today":[1,1],"promotion:":[0,1],"only":[0,1],"bob":[1,0],"meeting":[1,0],"forget":[1,1],"our":[1,1],"special":[0,1]}}

Contribution

Contribution via issues or pull requests are appreciated.

License

Bayespam is distributed under the terms of the MIT License.