spaces 4.1.0

Set/space primitives for defining machine learning problems.
Documentation 
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use core::{BoundedSpace, Space, Card, Surjection};

/// Type representing the set of non-negative real numbers, R(≥0).
#[derive(Clone, Copy, Serialize)]
pub struct NonNegativeReals;

impl Space for NonNegativeReals {
    type Value = f64;

    fn dim(&self) -> usize { 1 }

    fn card(&self) -> Card { Card::Infinite }
}

impl BoundedSpace for NonNegativeReals {
    type BoundValue = Self::Value;

    fn inf(&self) -> Option<f64> { Some(0.0) }

    fn sup(&self) -> Option<f64> { None }

    fn contains(&self, val: Self::BoundValue) -> bool { val >= 0.0 }
}

impl Surjection<f64, f64> for NonNegativeReals {
    fn map(&self, val: f64) -> f64 { val.max(0.0) }
}