native_neural_network 0.1.6

Lib no_std Rust for native neural network (.rnn)
Documentation 
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pub fn mean(values: &[f32]) -> f32 {
    if values.is_empty() {
        return 0.0;
    }
    let mut acc = 0.0f32;
    for &v in values {
        acc += v;
    }
    acc / values.len() as f32
}

pub fn variance(values: &[f32]) -> f32 {
    if values.len() < 2 {
        return 0.0;
    }
    let m = mean(values);
    let mut acc = 0.0f32;
    for &v in values {
        let d = v - m;
        acc += d * d;
    }
    acc / values.len() as f32
}

pub fn min_max(values: &[f32]) -> Option<(f32, f32)> {
    if values.is_empty() {
        return None;
    }
    let mut min_v = values[0];
    let mut max_v = values[0];
    for &v in &values[1..] {
        if v < min_v {
            min_v = v;
        }
        if v > max_v {
            max_v = v;
        }
    }
    Some((min_v, max_v))
}