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/*
* Copyright (c) 2023 Stalwart Labs Ltd.
*
* This file is part of the Stalwart Mail Server.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
* in the LICENSE file at the top-level directory of this distribution.
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* You can be released from the requirements of the AGPLv3 license by
* purchasing a commercial license. Please contact licensing@stalw.art
* for more details.
*/
use std::{collections::HashMap, hash::BuildHasherDefault};
use nohash::NoHashHasher;
use serde::{Deserialize, Serialize};
use crate::tokenizers::osb::Gram;
pub mod cache;
pub mod classify;
pub mod tokenize;
pub mod train;
#[derive(Debug, Serialize, Deserialize, Default)]
pub struct BayesModel {
pub weights: HashMap<TokenHash, Weights, BuildHasherDefault<NoHashHasher<TokenHash>>>,
pub spam_learns: u32,
pub ham_learns: u32,
}
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BayesClassifier {
pub min_token_hits: u32,
pub min_tokens: u32,
pub min_prob_strength: f64,
pub min_learns: u32,
}
#[derive(Debug, Serialize, Deserialize, Default, Copy, Clone, PartialEq, Eq)]
pub struct TokenHash {
pub h1: u64,
pub h2: u64,
}
#[derive(Debug, Serialize, Deserialize, Default, Copy, Clone, Hash, PartialEq, Eq)]
pub struct Weights {
pub spam: u32,
pub ham: u32,
}
impl BayesClassifier {
pub fn new() -> Self {
BayesClassifier {
min_token_hits: 2,
min_tokens: 11,
min_prob_strength: 0.05,
min_learns: 200,
}
}
}
impl Default for BayesClassifier {
fn default() -> Self {
Self::new()
}
}
impl From<Gram<'_>> for TokenHash {
fn from(value: Gram<'_>) -> Self {
match value {
Gram::Uni { t1 } => TokenHash {
h1: xxhash_rust::xxh3::xxh3_64(t1.as_bytes()),
h2: farmhash::hash64(t1.as_bytes()),
},
Gram::Bi { t1, t2, .. } => {
let mut buf = Vec::with_capacity(t1.len() + t2.len() + 1);
buf.extend_from_slice(t1.as_bytes());
buf.push(b' ');
buf.extend_from_slice(t2.as_bytes());
TokenHash {
h1: xxhash_rust::xxh3::xxh3_64(&buf),
h2: farmhash::hash64(&buf),
}
}
}
}
}
impl std::hash::Hash for TokenHash {
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
state.write_u64(self.h1 ^ self.h2);
}
}
impl nohash::IsEnabled for TokenHash {}
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