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annotate src/LazyTensors/lazy_array.jl @ 2015:5c2448d6a201 feature/grids/geometry_functions tip

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Structure tests a bit more
author Jonatan Werpers <jonatan@werpers.com>
date Fri, 09 May 2025 15:57:38 +0200
parents dfb43fdac9fc
children
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1 """
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2 LazyArray{T,D} <: AbstractArray{T,D}
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3
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4 Array which is calculated lazily when indexing.
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6 A subtype of `LazyArray` will use lazy version of `+`, `-`, `*`, `/`.
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7 """
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8 abstract type LazyArray{T,D} <: AbstractArray{T,D} end
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10 struct LazyConstantArray{T,D} <: LazyArray{T,D}
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11 val::T
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12 size::NTuple{D,Int}
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13 end
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15 Base.size(lca::LazyConstantArray) = lca.size
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16 Base.getindex(lca::LazyConstantArray{T,D}, I::Vararg{Int,D}) where {T,D} = lca.val
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18 """
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19 LazyFunctionArray{F<:Function,T, D} <: LazyArray{T,D}
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21 A lazy array where each element is defined by a function f(i,j,...)
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22 """
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23 struct LazyFunctionArray{F<:Function,T, D} <: LazyArray{T,D}
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24 f::F
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25 size::NTuple{D,Int}
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26 end
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28 function LazyFunctionArray(f::F, size::NTuple{D,Int}) where {F<:Function,D}
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29 T = typeof(f(ones(Int, D)...))
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30 return LazyFunctionArray{F,T,D}(f,size)
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31 end
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33 Base.size(lfa::LazyFunctionArray) = lfa.size
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34
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35 function Base.getindex(lfa::LazyFunctionArray{F,T,D}, I::Vararg{Int,D}) where {F,T,D}
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36 @boundscheck checkbounds(lfa, I...)
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37 return @inbounds @inline lfa.f(I...)
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38 end
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41 """
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42 LazyElementwiseOperation{T,D,Op} <: LazyArray{T,D}
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43 Struct allowing for lazy evaluation of element-wise operations on `AbstractArray`s.
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44
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45 A `LazyElementwiseOperation` contains two arrays together with an operation.
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46 The operations are carried out when the `LazyElementwiseOperation` is indexed.
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47 """
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48 struct LazyElementwiseOperation{T,D,Op,T1<:AbstractArray{T,D},T2<:AbstractArray{T,D}} <: LazyArray{T,D}
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49 a::T1
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50 b::T2
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52 function LazyElementwiseOperation{T,D,Op}(a::T1,b::T2) where {T,D,Op,T1<:AbstractArray{T,D},T2<:AbstractArray{T,D}}
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53 @boundscheck if size(a) != size(b)
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54 throw(DimensionMismatch("dimensions must match"))
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55 end
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56 return new{T,D,Op,T1,T2}(a,b)
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57 end
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59 end
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60 LazyElementwiseOperation{T,D,Op}(a::AbstractArray{T,D},b::T) where {T,D,Op} = LazyElementwiseOperation{T,D,Op}(a, LazyConstantArray(b, size(a)))
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61 LazyElementwiseOperation{T,D,Op}(a::T,b::AbstractArray{T,D}) where {T,D,Op} = LazyElementwiseOperation{T,D,Op}(LazyConstantArray(a, size(b)), b)
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63 Base.size(v::LazyElementwiseOperation) = size(v.a)
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65 Base.@propagate_inbounds evaluate(leo::LazyElementwiseOperation{T,D,:+}, I::Vararg{Int,D}) where {T,D} = leo.a[I...] + leo.b[I...]
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66 Base.@propagate_inbounds evaluate(leo::LazyElementwiseOperation{T,D,:-}, I::Vararg{Int,D}) where {T,D} = leo.a[I...] - leo.b[I...]
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67 Base.@propagate_inbounds evaluate(leo::LazyElementwiseOperation{T,D,:*}, I::Vararg{Int,D}) where {T,D} = leo.a[I...] * leo.b[I...]
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68 Base.@propagate_inbounds evaluate(leo::LazyElementwiseOperation{T,D,:/}, I::Vararg{Int,D}) where {T,D} = leo.a[I...] / leo.b[I...]
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70 function Base.getindex(leo::LazyElementwiseOperation{T,D}, I::Vararg{Int,D}) where {T,D}
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71 @boundscheck checkbounds(leo.a, I...)
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72 return @inbounds evaluate(leo, I...)
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73 end
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75 # Define lazy operations for AbstractArrays. Operations constructs a LazyElementwiseOperation which
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76 # can later be indexed into. Lazy operations are denoted by the usual operator followed by a tilde
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77 Base.@propagate_inbounds +̃(a::AbstractArray{T,D}, b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:+}(a,b)
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78 Base.@propagate_inbounds -̃(a::AbstractArray{T,D}, b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:-}(a,b)
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79 Base.@propagate_inbounds *̃(a::AbstractArray{T,D}, b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:*}(a,b)
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80 Base.@propagate_inbounds /̃(a::AbstractArray{T,D}, b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:/}(a,b)
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82 Base.@propagate_inbounds +̃(a::AbstractArray{T,D}, b::T) where {T,D} = LazyElementwiseOperation{T,D,:+}(a,b)
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83 Base.@propagate_inbounds -̃(a::AbstractArray{T,D}, b::T) where {T,D} = LazyElementwiseOperation{T,D,:-}(a,b)
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84 Base.@propagate_inbounds *̃(a::AbstractArray{T,D}, b::T) where {T,D} = LazyElementwiseOperation{T,D,:*}(a,b)
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85 Base.@propagate_inbounds /̃(a::AbstractArray{T,D}, b::T) where {T,D} = LazyElementwiseOperation{T,D,:/}(a,b)
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87 Base.@propagate_inbounds +̃(a::T, b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:+}(a,b)
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88 Base.@propagate_inbounds -̃(a::T, b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:-}(a,b)
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89 Base.@propagate_inbounds *̃(a::T, b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:*}(a,b)
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90 Base.@propagate_inbounds /̃(a::T, b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:/}(a,b)
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94 # Overload +,-,*,/ for LazyArrays
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95 # Element wise operation for `*` and `/` are not overloaded for due to conflicts with the behavior
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96 # of regular `*` and `/` for AbstractArrays. Use tilde versions instead.
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97 Base.@propagate_inbounds Base.:+(a::LazyArray{T,D}, b::LazyArray{T,D}) where {T,D} = a +̃ b
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98 Base.@propagate_inbounds Base.:-(a::LazyArray{T,D}, b::LazyArray{T,D}) where {T,D} = a -̃ b
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99
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100 Base.@propagate_inbounds Base.:+(a::LazyArray{T,D}, b::AbstractArray{T,D}) where {T,D} = a +̃ b
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101 Base.@propagate_inbounds Base.:-(a::LazyArray{T,D}, b::AbstractArray{T,D}) where {T,D} = a -̃ b
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103 Base.@propagate_inbounds Base.:+(a::AbstractArray{T,D}, b::LazyArray{T,D}) where {T,D} = a +̃ b
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104 Base.@propagate_inbounds Base.:-(a::AbstractArray{T,D}, b::LazyArray{T,D}) where {T,D} = a -̃ b
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106 Base.@propagate_inbounds Base.:+(a::LazyArray{T,D}, b::T) where {T,D} = a +̃ b
6104db60b7a3 Export binary operations for LazyArrays and scalars
Vidar Stiernström <vidar.stiernstrom@it.uu.se>
parents: 1015
diff changeset
107 Base.@propagate_inbounds Base.:-(a::LazyArray{T,D}, b::T) where {T,D} = a -̃ b
6104db60b7a3 Export binary operations for LazyArrays and scalars
Vidar Stiernström <vidar.stiernstrom@it.uu.se>
parents: 1015
diff changeset
108
6104db60b7a3 Export binary operations for LazyArrays and scalars
Vidar Stiernström <vidar.stiernstrom@it.uu.se>
parents: 1015
diff changeset
109 Base.@propagate_inbounds Base.:+(a::T, b::LazyArray{T,D}) where {T,D} = a +̃ b
6104db60b7a3 Export binary operations for LazyArrays and scalars
Vidar Stiernström <vidar.stiernstrom@it.uu.se>
parents: 1015
diff changeset
110 Base.@propagate_inbounds Base.:-(a::T, b::LazyArray{T,D}) where {T,D} = a -̃ b