Macro numpy::einsum

macro_rules! einsum {
    ($subscripts: literal $(,$array: ident)+ $(,)*) => { ... };
}

Return the Einstein summation convention of given tensors.

For more about the Einstein summation convention, you may reffer to the numpy document.

Example

pyo3::Python::with_gil(|py| {
    let a = numpy::PyArray::arange(py, 0, 2 * 3 * 4, 1).reshape([2, 3, 4]).unwrap();
    let b = numpy::pyarray![py, [20, 30], [40, 50], [60, 70]];
    let einsum = numpy::einsum!("ijk,ji->ik", a, b).unwrap();
    assert_eq!(
        einsum.readonly().as_array(),
        ndarray::array![[640,  760,  880, 1000], [2560, 2710, 2860, 3010]]
    );
});