Convert Array<A, D> into ArrayBase<S, D>

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技术栈
rust
领域
data

调研方向

Start by reading Array, ArrayBase, into_owned, and into_shared, then review the strongly typed strides discussion in issue #283. Determine whether an owned array can be generalized to ArrayBase without copying while preserving its strides, with results usable as both Array and RcArray.

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描述

enhancement

I would like to switch array type to implement a general library

pub fn algorithm<A, Si, So, D>(a: ArrayBase<Si, D>) -> ArrayBase<So, D>
where Si: Data<Elem = A>, So: DataOwned<Elem =A>, D: Dimension
{ ... }

Users of this library can get the result using both Array and RcArray:

let result1: Array2<f64> = algorithm(a);
let result2: RcArray2<f64> = algorithm(a);

However, some algorithm in this crate (e.g. ndarray::linalg::Dot::dot) returns Array,
and thus I try to write a function that convert Array<D> into ArrayBase<S: DataOwned, D> without data copy:

fn generalize<A, S, D>(a: Array<A, D>) -> ArrayBase<S, D>
where
  S: DataOwned<Elem =A>,
  D: Dimension,
{
  ArrayBase::from_shape_vec(a.dim(), a.into_raw_vec())
}

This is an generalization of into_owned and into_shared. This generalize can be compiled, but does not keep its stride.

let a: Array3<f64> = Array::zeros((3, 2, 4).f()); // f-order
let ans = a.clone();
let a: Array3<f64> = generalize(a); // c-order
assert_eq!(a, ans); /// panic!

I cannot find a way to keep strides :< I suspect that I need the strongly typed strides #283
Is it possible to implement it correctly out of this crate? If impossible, please add such function.

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