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annotate src/LazyTensors/lazy_array.jl @ 371:241bd2512c20 feature/lazy_function

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Add a LazyFunctionArray that evaluates a function for each index.
author Jonatan Werpers <jonatan@werpers.com>
date Wed, 30 Sep 2020 19:48:17 +0200
parents 01b851161018
children 33c360c3c6bc
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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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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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21
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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 function Base.getindex(lfa::LazyFunctionArray{F,T,D}, I::Vararg{Int,D}) where {F,T,D}
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37 @boundscheck checkbounds(lfa, I...)
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38 return lfa.f(I...)
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39 end
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42 """
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43 LazyElementwiseOperation{T,D,Op} <: LazyArray{T,D}
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44 Struct allowing for lazy evaluation of elementwise operations on AbstractArrays.
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46 A LazyElementwiseOperation contains two arrays together with an operation.
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47 The operations are carried out when the LazyElementwiseOperation is indexed.
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48 """
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49 struct LazyElementwiseOperation{T,D,Op} <: LazyArray{T,D}
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50 a::AbstractArray{T,D}
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51 b::AbstractArray{T,D}
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53 function LazyElementwiseOperation{T,D,Op}(a::AbstractArray{T,D},b::AbstractArray{T,D}) where {T,D,Op}
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54 @boundscheck if size(a) != size(b)
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55 throw(DimensionMismatch("dimensions must match"))
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56 end
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57 return new{T,D,Op}(a,b)
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58 end
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59
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60 LazyElementwiseOperation{T,D,Op}(a::AbstractArray{T,D},b::T) where {T,D,Op} = new{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} = new{T,D,Op}(LazyConstantArray(a, size(b)), b)
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62 end
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63 # TODO: Move Op to be the first parameter? Compare to Binary operations
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65 Base.size(v::LazyElementwiseOperation) = size(v.a)
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67 evaluate(leo::LazyElementwiseOperation{T,D,:+}, I::Vararg{Int,D}) where {T,D} = leo.a[I...] + leo.b[I...]
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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
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72 # TODO: Make sure boundschecking is done properly and that the lenght of the vectors are equal
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73 # NOTE: Boundschecking in getindex functions now assumes that the size of the
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74 # vectors in the LazyElementwiseOperation are the same size. If we remove the
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75 # size assertion in the constructor we might have to handle
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76 # boundschecking differently.
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77 Base.@propagate_inbounds @inline function Base.getindex(leo::LazyElementwiseOperation{T,D}, I::Vararg{Int,D}) where {T,D}
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78 @boundscheck if !checkbounds(Bool, leo.a, I...)
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79 throw(BoundsError([leo], I...))
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80 end
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81 return evaluate(leo, I...)
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82 end
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83
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84 # Define lazy operations for AbstractArrays. Operations constructs a LazyElementwiseOperation which
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85 # can later be indexed into. Lazy operations are denoted by the usual operator followed by a tilde
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86 Base.@propagate_inbounds +̃(a::AbstractArray{T,D}, b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:+}(a,b)
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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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91 Base.@propagate_inbounds +̃(a::AbstractArray{T,D}, b::T) 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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96 Base.@propagate_inbounds +̃(a::T, b::AbstractArray{T,D}) 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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103 # NOTE: Är det knas att vi har till exempel * istället för .* ??
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104 # Oklart om det ens går att lösa..
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105 Base.@propagate_inbounds Base.:+(a::LazyArray{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::AbstractArray{T,D}) where {T,D} = a +̃ b
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107 Base.@propagate_inbounds Base.:+(a::AbstractArray{T,D}, b::LazyArray{T,D}) where {T,D} = a +̃ b
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108
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109 Base.@propagate_inbounds Base.:-(a::LazyArray{T,D}, b::LazyArray{T,D}) where {T,D} = a -̃ b
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110 Base.@propagate_inbounds Base.:-(a::LazyArray{T,D}, b::AbstractArray{T,D}) where {T,D} = a -̃ b
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111 Base.@propagate_inbounds Base.:-(a::AbstractArray{T,D}, b::LazyArray{T,D}) where {T,D} = a -̃ b
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112
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113 # Element wise operation for `*` and `\` are not overloaded due to conflicts with the behavior
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114 # of regular `*` and `/` for AbstractArrays. Use tilde versions instead.
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115
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116 export +̃, -̃, *̃, /̃