re_view_tensor 0.26.2

A view dedicated to visualizing tensors with arbitrary dimensionality.
Documentation 
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#![expect(clippy::unwrap_used)]

use re_types::datatypes::{TensorBuffer, TensorData};
use re_types::tensor_data::TensorCastError;

#[test]
fn convert_tensor_to_ndarray_u8() {
    let t = TensorData::new(
        vec![
            TensorDimension::unnamed(3),
            TensorDimension::unnamed(4),
            TensorDimension::unnamed(5),
        ],
        TensorBuffer::U8(vec![0; 60].into()),
    );

    let n = ndarray::ArrayViewD::<u8>::try_from(&t).unwrap();

    assert_eq!(n.shape(), &[3, 4, 5]);
}

#[test]
fn convert_tensor_to_ndarray_u16() {
    let t = TensorData::new(
        vec![
            TensorDimension::unnamed(3),
            TensorDimension::unnamed(4),
            TensorDimension::unnamed(5),
        ],
        TensorBuffer::U16(vec![0_u16; 60].into()),
    );

    let n = ndarray::ArrayViewD::<u16>::try_from(&t).unwrap();

    assert_eq!(n.shape(), &[3, 4, 5]);
}

#[test]
fn convert_tensor_to_ndarray_f32() {
    let t = TensorData::new(
        vec![
            TensorDimension::unnamed(3),
            TensorDimension::unnamed(4),
            TensorDimension::unnamed(5),
        ],
        TensorBuffer::F32(vec![0_f32; 60].into()),
    );

    let n = ndarray::ArrayViewD::<f32>::try_from(&t).unwrap();

    assert_eq!(n.shape(), &[3, 4, 5]);
}

#[test]
fn convert_ndarray_u8_to_tensor() {
    let n = ndarray::array![[1., 2., 3.], [4., 5., 6.]];
    let t = TensorData::try_from(n).unwrap();

    assert_eq!(
        t.shape(),
        &[TensorDimension::unnamed(2), TensorDimension::unnamed(3)]
    );
}

#[test]
fn convert_ndarray_slice_to_tensor() {
    let n = ndarray::array![[1., 2., 3.], [4., 5., 6.]];
    let n = &n.slice(ndarray::s![.., 1]);
    let t = TensorData::try_from(*n).unwrap();

    assert_eq!(t.shape(), &[TensorDimension::unnamed(2)]);
}

#[test]
fn check_slices() {
    let t = TensorData::new(
        vec![
            TensorDimension::unnamed(3),
            TensorDimension::unnamed(4),
            TensorDimension::unnamed(5),
        ],
        TensorBuffer::U16((0_u16..60).collect::<Vec<u16>>().into()),
    );

    let n = ndarray::ArrayViewD::<u16>::try_from(&t).unwrap();

    // First element should be 0
    assert_eq!(n[[0, 0, 0]], 0);
    // Last element should be 59
    assert_eq!(n[[2, 3, 4]], 59);

    // Try all the indices:
    for z in 0..3 {
        for y in 0..4 {
            for x in 0..5 {
                assert_eq!(n[[z, y, x]] as usize, z * 4 * 5 + y * 5 + x);
            }
        }
    }

    // Slice the tensor
    let sl: ndarray::ArrayView2<'_, u16> = n.slice(ndarray::s![.., 1, ..]);

    // New slice is missing the middle dimension
    assert_eq!(sl.shape(), &[3, 5]);

    // Equivalent to (0,1,0) = 0*20 + 1*5 + 0 = 5
    assert_eq!(sl[[0, 0]], 5);
    // Equivalent to (1,1,3) = 1*20 + 1*5 + 3 = 28
    assert_eq!(sl[[1, 3]], 28);
}

#[test]
fn check_tensor_shape_error() {
    let t = TensorData::new(
        vec![
            TensorDimension::unnamed(3),
            TensorDimension::unnamed(4),
            TensorDimension::unnamed(5),
        ],
        TensorBuffer::U8(vec![0; 59].into()),
    );

    let n = ndarray::ArrayViewD::<u8>::try_from(&t);

    assert_eq!(
        n,
        Err(TensorCastError::BadTensorShape {
            source: ndarray::ShapeError::from_kind(ndarray::ErrorKind::OutOfBounds)
        })
    );
}

#[test]
fn check_tensor_type_error() {
    let t = TensorData::new(
        vec![
            TensorDimension::unnamed(3),
            TensorDimension::unnamed(4),
            TensorDimension::unnamed(5),
        ],
        TensorBuffer::U16(vec![0; 60].into()),
    );

    let n = ndarray::ArrayViewD::<u8>::try_from(&t);

    assert_eq!(n, Err(TensorCastError::TypeMismatch));
}