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comparison src/LazyTensors/tuple_manipulation.jl @ 1229:8f4259fbd39c refactor/LazyTensors/tuple_manipulation

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Simplify split_index
author Jonatan Werpers <jonatan@werpers.com>
date Sun, 19 Feb 2023 11:43:29 +0100
parents 73f262a0a384
children 723a583cef96
comparison
equal deleted inserted replaced
1228:73f262a0a384 1229:8f4259fbd39c
1 """ 1 """
2 split_index(::Val{dim_before}, ::Val{dim_view}, ::Val{dim_index}, ::Val{dim_after}, I...) 2 split_index(dim_before, dim_view, dim_index, dim_after, I...)
3 3
4 Splits the multi-index `I` into two parts. One part which is expected to be 4 Splits the multi-index `I` into two parts. One part which is expected to be
5 used as a view, and one which is expected to be used as an index. 5 used as a view, and one which is expected to be used as an index.
6 Eg. 6 Eg.
7 ``` 7 ```
8 split_index(Val(1),Val(3),Val(2),Val(1),(1,2,3,4)) -> (1,:,:,:,4), (2,3) 8 split_index(1, 3, 2, 1, (1,2,3,4)) -> (1,:,:,:,4), (2,3)
9 ``` 9 ```
10 10
11 `dim_view` controls how many colons are in the view, and `dim_index` controls 11 `dim_view` controls how many colons are in the view, and `dim_index` controls
12 how many elements are extracted from the middle. 12 how many elements are extracted from the middle.
13 `dim_before` and `dim_after` decides the length of the index parts before and after the colons in the view index. 13 `dim_before` and `dim_after` decides the length of the index parts before and after the colons in the view index.
16 16
17 The returned values satisfy 17 The returned values satisfy
18 * `length(view_index) == dim_before + dim_view + dim_after` 18 * `length(view_index) == dim_before + dim_view + dim_after`
19 * `length(I_middle) == dim_index` 19 * `length(I_middle) == dim_index`
20 """ 20 """
21 function split_index(::Val{dim_before}, ::Val{dim_view}, ::Val{dim_index}, ::Val{dim_after}, I...) where {dim_before,dim_view, dim_index,dim_after} 21 function split_index(dim_before, dim_view, dim_index, dim_after, I...)
22 I_before, I_middle, I_after = @inline split_tuple(I, (dim_before, dim_index, dim_after)) 22 @inline
23 I_before, I_middle, I_after = split_tuple(I, (dim_before, dim_index, dim_after))
23 24
24 view_index = (I_before..., ntuple((i)->:, dim_view)..., I_after...) 25 view_index = (I_before..., ntuple((i)->:, dim_view)..., I_after...)
25 26
26 return view_index, I_middle 27 return view_index, I_middle
27 end 28 end