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Bug in `strides` for reshaped views

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#2 4 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
julia
Domain
performance

Research direction

Start by reproducing the reported Julia REPL cases for ArrayInterface.strides on u_view and the two reshaped views. Trace the strides entry point for view and reshape behavior, then compare the results with the expected (10,) and (10, 20) semantics. Done means the behavior is clarified or corrected and the reported cases are covered by tests.

Written by the indexing model from the issue text.

Description

julia> using ArrayInterface

julia> u_base = randn(10, 10); u_view = view(u_base, 3, :); u_reshaped_view1 = reshape(u_view, 1, :); u_reshaped_view2 = reshape(u_view, 2, :);

julia> ArrayInterface.strides(u_reshaped_view1)
(static(1), 1)

julia> ArrayInterface.strides(u_reshaped_view2)
(static(1), 2)

These seem to be wrong, I think. Because of ArrayInterface.strides(u_view) == (10,), the strides should be

  • ArrayInterface.strides(u_reshaped_view1) = (10 #= doesn't matter since there is only one element in this dimension =#, 10)
  • ArrayInterface.strides(u_reshaped_view1) = (10, 20)

Is that correct?

Dominant language
Julia
Stars
14
Forks
8
PR merge metrics
No merged PRs in 30d

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