topos 0.11.0

A tiny autograd engine for the GPU-poor, written in idiomatic Rust.
Documentation 
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use super::Shape;

#[test]
fn scalar_has_rank_zero_and_volume_one() {
    let shape = Shape::scalar();
    assert_eq!(shape.rank(), 0);
    assert_eq!(shape.volume(), 1);
    assert_eq!(shape.axes(), &[] as &[usize]);
}

#[test]
fn axes_determine_rank_and_volume() {
    let shape = Shape::new([2, 3, 4]);
    assert_eq!(shape.rank(), 3);
    assert_eq!(shape.volume(), 24);
    assert_eq!(shape.axes(), &[2, 3, 4]);
}

#[test]
fn display_lists_the_axes() {
    assert_eq!(Shape::new([3, 2]).to_string(), "[3, 2]");
    assert_eq!(Shape::scalar().to_string(), "[]");
}

#[test]
#[should_panic(expected = "overflows")]
fn volume_rejects_overflow() {
    Shape::new([usize::MAX, 2]).volume();
}

#[test]
fn without_axis_drops_the_named_axis() {
    let shape = Shape::new([2, 3, 4]);
    assert_eq!(shape.without_axis(0), Shape::new([3, 4]));
    assert_eq!(shape.without_axis(1), Shape::new([2, 4]));
    assert_eq!(Shape::new([5]).without_axis(0), Shape::scalar());
}

#[test]
#[should_panic(expected = "out of rank")]
fn without_axis_rejects_excessive_axes() {
    Shape::new([2, 3]).without_axis(2);
}