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How create Array from exists Memory without copy? #425
Description
I find https://docs.rs/numpy/latest/numpy/array/struct.PyArray.html#method.from_slice
by it copy the memory.
I find https://docs.rs/numpy/latest/numpy/array/struct.PyArray.html#method.from_slice
by it copy the memory.
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adamreichold commentedon Apr 8, 2024
Conversions which take ownership of Rust data and transfer it over to Python use the
IntoPyArraytrait.It basically supports
Vec<T>,Box<[T]>andArray<T, D>whereTis any of the supported element types.If this ties in with PyO3/pyo3#4058, I could image adding support for
Mmapreinterpreted 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.