How create Array from exists Memory without copy?

Question

How create Array from exists Memory without copy?

ZHUI opened this issue 2 years ago · 1 comments

ZHUI commented 2 years ago

I find https://docs.rs/numpy/latest/numpy/array/struct.PyArray.html#method.from_slice

by it copy the memory.

Answer 1 · 2024-04-08T09:29:31.000Z

Conversions which take ownership of Rust data and transfer it over to Python use the IntoPyArray trait.

It basically supports Vec<T>, Box<[T]> and Array<T, D> where T is any of the supported element types.

If this ties in with PyO3/pyo3#4058, I could image adding support for Mmap reinterpreted as [T] to turn this into a one-dimensional NumPy array without copying which you can then reshape into the final form without copying via the usual NumPy API.