chore(candle): Allow enabling accelerate

[dcvz]

Checklist

• Confirmed that run-checks all script has been executed.
• Made sure the book is up to date with changes in this PR.

Related Issues/PRs

Fixes #968

Changes

Enables using accelerate for macOS

Testing

Tests have been run

[nathanielsimard]

@louisfd can you check why the test fails on accelerate?

[dcvz]

@louisfd @nathanielsimard I fixed the failing test on accelerate. Error previously was:

---- tests::ad_transpose::tests::should_diff_swap_dims stdout ----
thread 'tests::ad_transpose::tests::should_diff_swap_dims' panicked at burn-candle/src/ops/tensor.rs:141:68:
called `Result::unwrap()` on an `Err` value: MatMulUnexpectedStriding(MatMulUnexpectedStriding { lhs_l: Layout { shape: [2, 2, 2], stride: [4, 2, 1], start_offset: 0 }, rhs_l: Layout { shape: [2, 2, 2], stride: [1, 2, 4], start_offset: 0 }, bmnk: (2, 2, 2, 2), msg: "non-contiguous rhs" })

I resolve this by making sure the rhs is contiguous. This is a noop if it was already contiguous so I think it should be ok, but take a look.

[antimora]

LGTM.

I have tested on M3 Max and it's working.