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annotate src/LazyTensors/tuple_manipulation.jl @ 1000:1091ac8c69ad refactor/lazy_tensors

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Rename another struct
author Jonatan Werpers <jonatan@werpers.com>
date Fri, 18 Mar 2022 21:54:01 +0100
parents 20c376dffe84
children 0905cec43d2e
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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 = split_tuple(I, Val(dim_before), Val(dim_index))
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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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28
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29 # TODO: Can this be replaced by something more elegant while still being type stable? 2020-10-21
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30 # See:
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31 # https://github.com/JuliaLang/julia/issues/34884
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32 # https://github.com/JuliaLang/julia/issues/30386
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33 """
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34 slice_tuple(t, Val(l), Val(u))
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35
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36 Get a slice of a tuple in a type stable way.
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37 Equivalent to `t[l:u]` but type stable.
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38 """
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39 function slice_tuple(t,::Val{L},::Val{U}) where {L,U}
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40 return ntuple(i->t[i+L-1], U-L+1)
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41 end
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42
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43 """
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44 split_tuple(t::Tuple{...}, ::Val{M}) where {N,M}
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45
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46 Split the tuple `t` into two parts. the first part is `M` long.
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47 E.g
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48 ```julia
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49 split_tuple((1,2,3,4),Val(3)) -> (1,2,3), (4,)
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50 ```
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51 """
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52 function split_tuple(t::NTuple{N,Any},::Val{M}) where {N,M}
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53 return slice_tuple(t,Val(1), Val(M)), slice_tuple(t,Val(M+1), Val(N))
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54 end
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55
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56 """
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57 split_tuple(t::Tuple{...},::Val{M},::Val{K}) where {N,M,K}
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58
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59 Same as `split_tuple(t::NTuple{N},::Val{M})` but splits the tuple in three parts. With the first
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60 two parts having lenght `M` and `K`.
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61 """
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62 function split_tuple(t::NTuple{N,Any},::Val{M},::Val{K}) where {N,M,K}
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63 p1, tail = split_tuple(t, Val(M))
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64 p2, p3 = split_tuple(tail, Val(K))
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65 return p1,p2,p3
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66 end
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67
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68
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69 """
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70 flatten_tuple(t)
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71
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72 Takes a nested tuple and flattens the whole structure
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73 """
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74 flatten_tuple(t::NTuple{N, Number} where N) = t
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75 flatten_tuple(t::Tuple) = ((flatten_tuple.(t)...)...,) # simplify?
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76 flatten_tuple(ts::Vararg) = flatten_tuple(ts)