Does sagemath support something similar to numpy's einsum for symbolic arrays?

[Anton Todorov]

Einsum: https://numpy.org/doc/stable/reference/generated/numpy.einsum.html

It is a way to define multiple operations on arrays of arbitrary shape. I've not seen anything that suggests this is implemented in sagemath, but I was hoping there might be something hidden.

What I need this for is to calculate symbolic results of array operations which are too cumbersome to represent as matrix operations.

[Matthias Koeppe]

You might be looking for https://doc.sagemath.org/html/en/reference/tensor_free_modules/sage/tensor/modules/tensor_with_indices.html

[Anton Todorov]

Looks close but not quite.

I'm interested in what's described here: https://stats.stackexchange.com/a/198395

Basically a dumb as bricks extension to matrices to higher dimensions with a contraction along selectable axes, with no notion of co and contravariance, and ability to have any number of elements in each dimension, e.g. a (8,1,512) shaped tensor (or n-way-array) should be possible.

From what I've seen of tensors with indices are forced to be n-dimensional cubes (along with having the co and contravariant limitations to contractions). 

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