Mercurial > repos > public > sbplib_julia
annotate LazyTensors/src/lazy_operations.jl @ 197:a340fa91b1fc boundary_conditions
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author | Jonatan Werpers <jonatan@werpers.com> |
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date | Thu, 20 Jun 2019 23:26:43 +0200 |
parents | b3c252280a19 |
children | b5c9be7f391c |
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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 """ |
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12 LazyTensorMappingApplication{T,R,D} <: LazyArray{T,R} |
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13 |
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14 Struct for lazy application of a TensorMapping. Created using `*`. |
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15 |
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16 Allows the result of a `TensorMapping` applied to a vector to be treated as an `AbstractArray`. |
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17 With a mapping `m` and a vector `v` the LazyTensorMappingApplication object can be created by `m*v`. |
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18 The actual result will be calcualted when indexing into `m*v`. |
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19 """ |
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20 struct LazyTensorMappingApplication{T,R,D} <: LazyArray{T,R} |
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21 t::TensorMapping{T,R,D} |
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22 o::AbstractArray{T,D} |
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23 end |
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24 export LazyTensorMappingApplication |
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25 |
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26 Base.:*(tm::TensorMapping{T,R,D}, o::AbstractArray{T,D}) where {T,R,D} = LazyTensorMappingApplication(tm,o) |
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27 |
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28 Base.getindex(ta::LazyTensorMappingApplication{T,R,D}, I::Vararg) where {T,R,D} = apply(ta.t, ta.o, I...) |
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29 Base.size(ta::LazyTensorMappingApplication{T,R,D}) where {T,R,D} = range_size(ta.t,size(ta.o)) |
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30 # TODO: What else is needed to implement the AbstractArray interface? |
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31 |
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32 |
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33 # # We need the associativity to be a→b→c = a→(b→c), which is the case for '→' |
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34 Base.:*(args::Union{TensorMapping{T}, AbstractArray{T}}...) where T = foldr(*,args) |
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35 # # Should we overload some other infix binary operator? |
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36 # →(tm::TensorMapping{T,R,D}, o::AbstractArray{T,D}) where {T,R,D} = LazyTensorMappingApplication(tm,o) |
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37 # TODO: We need to be really careful about good error messages. |
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38 # For example what happens if you try to multiply LazyTensorMappingApplication with a TensorMapping(wrong order)? |
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39 |
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40 |
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41 |
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42 """ |
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43 LazyElementwiseOperation{T,D,Op, T1<:AbstractArray{T,D}, T2 <: AbstractArray{T,D}} <: AbstractArray{T,D} |
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44 |
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45 Struct allowing for lazy evaluation of elementwise operations on AbstractArrays. |
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46 |
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47 A LazyElementwiseOperation contains two AbstractArrays of equal size, |
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48 together with an operation. The operations are carried out when the |
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49 LazyElementwiseOperation is indexed. |
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50 """ |
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51 struct LazyElementwiseOperation{T,D,Op, T1<:AbstractArray{T,D}, T2 <: AbstractArray{T,D}} <: LazyArray{T,D} |
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52 a::T1 |
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53 b::T2 |
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54 |
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55 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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56 return new{T,D,Op,T1,T2}(a,b) |
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57 end |
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58 end |
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59 |
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60 Base.size(v::LazyElementwiseOperation) = size(v.a) |
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61 |
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62 # TODO: Make sure boundschecking is done properly and that the lenght of the vectors are equal |
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63 # NOTE: Boundschecking in getindex functions now assumes that the size of the |
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64 # vectors in the LazyElementwiseOperation are the same size. If we remove the |
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65 # size assertion in the constructor we might have to handle |
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66 # boundschecking differently. |
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67 Base.@propagate_inbounds @inline function Base.getindex(leo::LazyElementwiseOperation{T,D,:+}, I...) where {T,D} |
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68 @boundscheck if !checkbounds(Bool,leo.a,I...) |
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69 throw(BoundsError([leo],[I...])) |
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70 end |
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71 return leo.a[I...] + leo.b[I...] |
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72 end |
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73 Base.@propagate_inbounds @inline function Base.getindex(leo::LazyElementwiseOperation{T,D,:-}, I...) where {T,D} |
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74 @boundscheck if !checkbounds(Bool,leo.a,I...) |
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75 throw(BoundsError([leo],[I...])) |
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76 end |
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77 return leo.a[I...] - leo.b[I...] |
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78 end |
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79 Base.@propagate_inbounds @inline function Base.getindex(leo::LazyElementwiseOperation{T,D,:*}, I...) where {T,D} |
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80 @boundscheck if !checkbounds(Bool,leo.a,I...) |
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81 throw(BoundsError([leo],[I...])) |
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82 end |
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83 return leo.a[I...] * leo.b[I...] |
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84 end |
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85 Base.@propagate_inbounds @inline function Base.getindex(leo::LazyElementwiseOperation{T,D,:/}, I...) where {T,D} |
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86 @boundscheck if !checkbounds(Bool,leo.a,I...) |
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87 throw(BoundsError([leo],[I...])) |
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88 end |
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89 return leo.a[I...] / leo.b[I...] |
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90 end |
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91 |
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92 # Define lazy operations for AbstractArrays. Operations constructs a LazyElementwiseOperation which |
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93 # can later be indexed into. Lazy operations are denoted by the usual operator followed by a tilde |
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94 @inline +̃(a::AbstractArray{T,D},b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:+}(a,b) |
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95 @inline -̃(a::AbstractArray{T,D},b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:-}(a,b) |
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96 @inline *̃(a::AbstractArray{T,D},b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:*}(a,b) |
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97 @inline /̃(a::AbstractArray{T,D},b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:/}(a,b) |
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98 |
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99 |
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100 Base.:+(a::LazyArray{T,D},b::AbstractArray{T,D}) where {T,D} = a +̃ b |
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101 Base.:+(a::AbstractArray{T,D}, b::LazyArray{T,D}) where {T,D} = b + a |
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102 Base.:-(a::LazyArray{T,D},b::AbstractArray{T,D}) where {T,D} = a -̃ b |
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103 Base.:-(a::AbstractArray{T,D}, b::LazyArray{T,D}) where {T,D} = a -̃ b |
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104 Base.:*(a::LazyArray{T,D},b::AbstractArray{T,D}) where {T,D} = a *̃ b |
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105 Base.:*(a::AbstractArray{T,D},b::LazyArray{T,D}) where {T,D} = b * a |
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106 # TODO: / seems to be ambiguous |
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107 # Base.:/(a::LazyArray{T,D},b::AbstractArray{T,D}) where {T,D} = a /̃ b |
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108 # Base.:/(a::AbstractArray{T,D},b::LazyArray{T,D}) where {T,D} = a /̃ b |
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109 |
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110 export +̃, -̃, *̃, /̃ |
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111 |
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112 |
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113 |
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114 """ |
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115 LazyTensorMappingTranspose{T,R,D} <: TensorMapping{T,D,R} |
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116 |
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117 Struct for lazy transpose of a TensorMapping. |
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118 |
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119 If a mapping implements the the `apply_transpose` method this allows working with |
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120 the transpose of mapping `m` by using `m'`. `m'` will work as a regular TensorMapping lazily calling |
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121 the appropriate methods of `m`. |
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122 """ |
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123 struct LazyTensorMappingTranspose{T,R,D} <: TensorMapping{T,D,R} |
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124 tm::TensorMapping{T,R,D} |
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125 end |
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126 export LazyTensorMappingTranspose |
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127 |
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128 # # TBD: Should this be implemented on a type by type basis or through a trait to provide earlier errors? |
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129 Base.adjoint(t::TensorMapping) = LazyTensorMappingTranspose(t) |
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130 Base.adjoint(t::LazyTensorMappingTranspose) = t.tm |
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131 |
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132 apply(tm::LazyTensorMappingTranspose{T,R,D}, v::AbstractArray{T,R}, I::Vararg) where {T,R,D} = apply_transpose(tm.tm, v, I...) |
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133 apply_transpose(tm::LazyTensorMappingTranspose{T,R,D}, v::AbstractArray{T,D}, I::Vararg) where {T,R,D} = apply(tm.tm, v, I...) |
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134 |
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135 range_size(tmt::LazyTensorMappingTranspose{T,R,D}, d_size::NTuple{R,Integer}) where {T,R,D} = domain_size(tmt.tm, domain_size) |
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136 domain_size(tmt::LazyTensorMappingTranspose{T,R,D}, r_size::NTuple{D,Integer}) where {T,R,D} = range_size(tmt.tm, range_size) |
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137 |
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138 |
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139 |
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140 # TODO: Write tests and documentation for LazyTensorMappingComposition |
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141 # struct LazyTensorMappingComposition{T,R,K,D} <: TensorMapping{T,R,D} |
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142 # t1::TensorMapping{T,R,K} |
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143 # t2::TensorMapping{T,K,D} |
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144 # end |
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145 |
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146 # Base.:∘(s::TensorMapping{T,R,K}, t::TensorMapping{T,K,D}) where {T,R,K,D} = LazyTensorMappingComposition(s,t) |
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147 |
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148 # function range_size(tm::LazyTensorMappingComposition{T,R,K,D}, domain_size::NTuple{D,Integer}) where {T,R,K,D} |
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149 # range_size(tm.t1, domain_size(tm.t2, domain_size)) |
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150 # end |
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151 |
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152 # function domain_size(tm::LazyTensorMappingComposition{T,R,K,D}, range_size::NTuple{R,Integer}) where {T,R,K,D} |
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153 # domain_size(tm.t1, domain_size(tm.t2, range_size)) |
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154 # end |
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155 |
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156 # function apply(c::LazyTensorMappingComposition{T,R,K,D}, v::AbstractArray{T,D}, I::Vararg) where {T,R,K,D} |
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157 # apply(c.t1, LazyTensorMappingApplication(c.t2,v), I...) |
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158 # end |
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159 |
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160 # function apply_transpose(c::LazyTensorMappingComposition{T,R,K,D}, v::AbstractArray{T,D}, I::Vararg) where {T,R,K,D} |
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161 # apply_transpose(c.t2, LazyTensorMappingApplication(c.t1',v), I...) |
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162 # end |
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163 |
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164 # # Have i gone too crazy with the type parameters? Maybe they aren't all needed? |
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165 |
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166 # export → |