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annotate src/LazyTensors/tuple_manipulation.jl @ 1227:06b983f0d236 refactor/LazyTensors/tuple_manipulation

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Delete complicated versions of split_tuple and slice_tuple
author Jonatan Werpers <jonatan@werpers.com>
date Sat, 18 Feb 2023 21:56:29 +0100
parents ea5b4fca85e0
children 73f262a0a384
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1 """
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2 split_index(::Val{dim_before}, ::Val{dim_view}, ::Val{dim_index}, ::Val{dim_after}, I...)
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3
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4 Splits the multi-index `I` into two parts. One part which is expected to be
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5 used as a view, and one which is expected to be used as an index.
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6 Eg.
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7 ```
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8 split_index(Val(1),Val(3),Val(2),Val(1),(1,2,3,4)) -> (1,:,:,:,4), (2,3)
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9 ```
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10
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11 `dim_view` controls how many colons are in the view, and `dim_index` controls
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12 how many elements are extracted from the middle.
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13 `dim_before` and `dim_after` decides the length of the index parts before and after the colons in the view index.
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14
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15 Arguments should satisfy `length(I) == dim_before+B_domain+dim_after`.
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16
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17 The returned values satisfy
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18 * `length(view_index) == dim_before + dim_view + dim_after`
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19 * `length(I_middle) == dim_index`
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20 """
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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}
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22 I_before, I_middle, I_after = @inline split_tuple(I, (dim_before, dim_index, dim_after))
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23
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24 view_index = (I_before..., ntuple((i)->:, dim_view)..., I_after...)
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25
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26 return view_index, I_middle
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27 end
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29
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30 """
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31 split_tuple(t, szs)
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32
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33 Split the tuple `t` into a set of tuples of the sizes given in `szs`.
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34 `sum(szs)` should equal `lenght(t)`.
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35
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36 E.g
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37 ```julia
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38 split_tuple((1,2,3,4,5,6), (3,1,2)) -> (1,2,3),(4,),(5,6)
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39 ```
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40 """
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41 function split_tuple(t, szs)
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42 if length(t) != sum(szs; init=0)
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43 throw(ArgumentError("length(t) must equal sum(szs)"))
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44 end
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45
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46 rs = sizes_to_ranges(szs)
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47 return map(r->t[r], rs)
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48 end
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49
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50 function sizes_to_ranges(szs)
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51 cum_szs = cumsum((0, szs...))
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52 return ntuple(i->cum_szs[i]+1:cum_szs[i+1], length(szs))
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53 end
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54
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55 concatenate_tuples(t::Tuple,ts::Vararg{Tuple}) = (t..., concatenate_tuples(ts...)...)
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56 concatenate_tuples(t::Tuple) = t
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59 """
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60 left_pad_tuple(t, val, N)
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61
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62 Left pad the tuple `t` to length `N` using the value `val`.
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63 """
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64 function left_pad_tuple(t, val, N)
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65 if N < length(t)
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66 throw(DomainError(N, "Can't pad tuple of length $(length(t)) to $N elements"))
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67 end
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68
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69 padding = ntuple(i->val, N-length(t))
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70 return (padding..., t...)
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71 end
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72
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73 """
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74 right_pad_tuple(t, val, N)
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75
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76 Right pad the tuple `t` to length `N` using the value `val`.
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77 """
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78 function right_pad_tuple(t, val, N)
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79 if N < length(t)
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80 throw(DomainError(N, "Can't pad tuple of length $(length(t)) to $N elements"))
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81 end
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82
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83 padding = ntuple(i->val, N-length(t))
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84 return (t..., padding...)
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85 end
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86