Einsum

[raphaelDkhn]

Feature Request

Describe the Feature Request

Tensor contraction over specified indices and outer product.

Here is a full description of Einsum in ONNX: https://github.com/onnx/onnx/blob/main/docs/Operators.md#einsum

Additional Context

You can take inspiration to EZKL or Julia-lang implementation of Einsum:

• https://github.com/zkonduit/ezkl/blob/bc5abf50a23bc00b95e133d380c5b0926a1528fd/src/tensor/ops.rs#L367
• https://github.com/ahwillia/Einsum.jl