Inverse and determinant trait for ndarray Array2

When creating some kalman filter code there was a need for Matrix inversion...

Installing external code to calculate inverses was clunky and painful. Hence this little trait. It's 'reasonably' quick for small Matrices, a dedicated library, even on a CPU is ~8x faster for bigger Matrices, as you would expect. Relatively small matrices / infrequent need for inverses are the use case here. With huge matrices for Machine Learning, you would be using iterative/approximate mathods anyway, such as gradient decent.

If your priority is ease of installation, pure Rust and portability then this code might be useful.

Simple reference with:

use ndarray_inverse::Inverse;

Add a cargo dependency too:

ndarray-inverse = "*"