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Fix a bunch of docstring mistakes
author Jonatan Werpers <jonatan@werpers.com>
date Fri, 14 Jan 2022 09:19:07 +0100
parents f65809a26a17
children 7ef605b8f132
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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 calcualted lazily when indexing.
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5
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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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9 export LazyArray
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10
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11 struct LazyConstantArray{T,D} <: LazyArray{T,D}
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12 val::T
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13 size::NTuple{D,Int}
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14 end
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16 Base.size(lca::LazyConstantArray) = lca.size
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17 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 """
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20 LazyFunctionArray{F<:Function,T, D} <: LazyArray{T,D}
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22 A lazy array where each element is defined by a function f(i,j,...)
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23 """
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24 struct LazyFunctionArray{F<:Function,T, D} <: LazyArray{T,D}
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25 f::F
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26 size::NTuple{D,Int}
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27 end
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28 export LazyFunctionArray
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30 function LazyFunctionArray(f::F, size::NTuple{D,Int}) where {F<:Function,D}
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31 T = typeof(f(ones(D)...))
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32 return LazyFunctionArray{F,T,D}(f,size)
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33 end
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35 Base.size(lfa::LazyFunctionArray) = lfa.size
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36
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37 function Base.getindex(lfa::LazyFunctionArray{F,T,D}, I::Vararg{Int,D}) where {F,T,D}
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38 @boundscheck checkbounds(lfa, I...)
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39 return lfa.f(I...)
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40 end
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43 """
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44 LazyElementwiseOperation{T,D,Op} <: LazyArray{T,D}
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45 Struct allowing for lazy evaluation of elementwise operations on `AbstractArray`s.
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46
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47 A `LazyElementwiseOperation` contains two arrays together with an operation.
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48 The operations are carried out when the `LazyElementwiseOperation` is indexed.
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49 """
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50 struct LazyElementwiseOperation{T,D,Op,T1<:AbstractArray{T,D},T2<:AbstractArray{T,D}} <: LazyArray{T,D}
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51 a::T1
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52 b::T2
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54 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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55 @boundscheck if size(a) != size(b)
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56 throw(DimensionMismatch("dimensions must match"))
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57 end
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58 return new{T,D,Op,T1,T2}(a,b)
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59 end
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61 end
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62 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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63 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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64 # TODO: Move Op to be the first parameter? Compare to Binary operations
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66 Base.size(v::LazyElementwiseOperation) = size(v.a)
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68 evaluate(leo::LazyElementwiseOperation{T,D,:+}, I::Vararg{Int,D}) where {T,D} = leo.a[I...] + leo.b[I...]
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69 evaluate(leo::LazyElementwiseOperation{T,D,:-}, I::Vararg{Int,D}) where {T,D} = leo.a[I...] - leo.b[I...]
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70 evaluate(leo::LazyElementwiseOperation{T,D,:*}, I::Vararg{Int,D}) where {T,D} = leo.a[I...] * leo.b[I...]
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71 evaluate(leo::LazyElementwiseOperation{T,D,:/}, I::Vararg{Int,D}) where {T,D} = leo.a[I...] / leo.b[I...]
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72
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73 # TODO: Make sure boundschecking is done properly and that the lenght of the vectors are equal
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74 # NOTE: Boundschecking in getindex functions now assumes that the size of the
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75 # vectors in the LazyElementwiseOperation are the same size. If we remove the
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76 # size assertion in the constructor we might have to handle
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77 # boundschecking differently.
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78 Base.@propagate_inbounds @inline function Base.getindex(leo::LazyElementwiseOperation{T,D}, I::Vararg{Int,D}) where {T,D}
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79 @boundscheck if !checkbounds(Bool, leo.a, I...)
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80 throw(BoundsError([leo], I...))
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81 end
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82 return evaluate(leo, I...)
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83 end
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85 # Define lazy operations for AbstractArrays. Operations constructs a LazyElementwiseOperation which
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86 # can later be indexed into. Lazy operations are denoted by the usual operator followed by a tilde
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87 Base.@propagate_inbounds +̃(a::AbstractArray{T,D}, b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:+}(a,b)
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88 Base.@propagate_inbounds -̃(a::AbstractArray{T,D}, b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:-}(a,b)
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89 Base.@propagate_inbounds *̃(a::AbstractArray{T,D}, b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:*}(a,b)
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90 Base.@propagate_inbounds /̃(a::AbstractArray{T,D}, b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:/}(a,b)
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92 Base.@propagate_inbounds +̃(a::AbstractArray{T,D}, b::T) where {T,D} = LazyElementwiseOperation{T,D,:+}(a,b)
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93 Base.@propagate_inbounds -̃(a::AbstractArray{T,D}, b::T) where {T,D} = LazyElementwiseOperation{T,D,:-}(a,b)
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94 Base.@propagate_inbounds *̃(a::AbstractArray{T,D}, b::T) where {T,D} = LazyElementwiseOperation{T,D,:*}(a,b)
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95 Base.@propagate_inbounds /̃(a::AbstractArray{T,D}, b::T) where {T,D} = LazyElementwiseOperation{T,D,:/}(a,b)
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97 Base.@propagate_inbounds +̃(a::T, b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:+}(a,b)
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98 Base.@propagate_inbounds -̃(a::T, b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:-}(a,b)
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99 Base.@propagate_inbounds *̃(a::T, b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:*}(a,b)
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100 Base.@propagate_inbounds /̃(a::T, b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:/}(a,b)
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104 # NOTE: Är det knas att vi har till exempel * istället för .* ??
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105 # Oklart om det ens går att lösa..
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106 Base.@propagate_inbounds Base.:+(a::LazyArray{T,D}, b::LazyArray{T,D}) where {T,D} = a +̃ b
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107 Base.@propagate_inbounds Base.:+(a::LazyArray{T,D}, b::AbstractArray{T,D}) where {T,D} = a +̃ b
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108 Base.@propagate_inbounds Base.:+(a::AbstractArray{T,D}, b::LazyArray{T,D}) where {T,D} = a +̃ b
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109
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110 Base.@propagate_inbounds Base.:-(a::LazyArray{T,D}, b::LazyArray{T,D}) where {T,D} = a -̃ b
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111 Base.@propagate_inbounds Base.:-(a::LazyArray{T,D}, b::AbstractArray{T,D}) where {T,D} = a -̃ b
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112 Base.@propagate_inbounds Base.:-(a::AbstractArray{T,D}, b::LazyArray{T,D}) where {T,D} = a -̃ b
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113
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114 # Element wise operation for `*` and `\` are not overloaded due to conflicts with the behavior
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115 # of regular `*` and `/` for AbstractArrays. Use tilde versions instead.
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116
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117 export +̃, -̃, *̃, /̃