annotate LazyTensors/src/lazy_operations.jl @ 199:a22b419bbdf0 boundary_conditions

Attempt fix for assertion inside constructor of LazyElementWiseOperation
author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Sat, 22 Jun 2019 20:56:17 +0200
parents b5c9be7f391c
children 9e737d19fcfe
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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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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
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13 """
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14 LazyTensorMappingApplication{T,R,D} <: LazyArray{T,R}
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16 Struct for lazy application of a TensorMapping. Created using `*`.
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18 Allows the result of a `TensorMapping` applied to a vector to be treated as an `AbstractArray`.
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19 With a mapping `m` and a vector `v` the LazyTensorMappingApplication object can be created by `m*v`.
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20 The actual result will be calcualted when indexing into `m*v`.
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21 """
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22 struct LazyTensorMappingApplication{T,R,D} <: LazyArray{T,R}
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23 t::TensorMapping{T,R,D}
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24 o::AbstractArray{T,D}
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25 end
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26 export LazyTensorMappingApplication
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28 Base.:*(tm::TensorMapping{T,R,D}, o::AbstractArray{T,D}) where {T,R,D} = LazyTensorMappingApplication(tm,o)
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30 Base.getindex(ta::LazyTensorMappingApplication{T,R,D}, I::Vararg) where {T,R,D} = apply(ta.t, ta.o, I...)
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31 Base.size(ta::LazyTensorMappingApplication{T,R,D}) where {T,R,D} = range_size(ta.t,size(ta.o))
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32 # TODO: What else is needed to implement the AbstractArray interface?
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33
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34 # # We need the associativity to be a→b→c = a→(b→c), which is the case for '→'
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35 Base.:*(args::Union{TensorMapping{T}, AbstractArray{T}}...) where T = foldr(*,args)
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36 # # Should we overload some other infix binary operator?
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37 # →(tm::TensorMapping{T,R,D}, o::AbstractArray{T,D}) where {T,R,D} = LazyTensorMappingApplication(tm,o)
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38 # TODO: We need to be really careful about good error messages.
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39 # For example what happens if you try to multiply LazyTensorMappingApplication with a TensorMapping(wrong order)?
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42
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43 """
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44 LazyElementwiseOperation{T,D,Op, T1<:AbstractArray{T,D}, T2 <: AbstractArray{T,D}} <: AbstractArray{T,D}
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45
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46 Struct allowing for lazy evaluation of elementwise operations on AbstractArrays.
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47
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48 A LazyElementwiseOperation contains two AbstractArrays of equal size,
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49 together with an operation. The operations are carried out when the
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50 LazyElementwiseOperation is indexed.
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51 """
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52 struct LazyElementwiseOperation{T,D,Op, T1<:AbstractArray{T,D}, T2 <: AbstractArray{T,D}} <: LazyArray{T,D}
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53 a::T1
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54 b::T2
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55
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56 @inline 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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57 # TODO: Remove boundscheck once assert can be turned off by
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58 # optimization flags. Ugly fix.
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59 # NOTE: Seems like adding the boundscheck introduces allocations. Can this
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60 # be fixed? Since boundscheck is removed when inlined into inbounds this
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61 # should not in practise effect performance.
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62 @boundscheck @assert size(a)==size(b)
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63 return new{T,D,Op,T1,T2}(a,b)
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64 end
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65 end
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66
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67 Base.size(v::LazyElementwiseOperation) = size(v.a)
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68
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69 # TODO: Make sure boundschecking is done properly and that the lenght of the vectors are equal
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70 # NOTE: Boundschecking in getindex functions now assumes that the size of the
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71 # vectors in the LazyElementwiseOperation are the same size. If we remove the
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72 # size assertion in the constructor we might have to handle
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73 # boundschecking differently.
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74 Base.@propagate_inbounds @inline function Base.getindex(leo::LazyElementwiseOperation{T,D,:+}, I...) where {T,D}
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75 @boundscheck if !checkbounds(Bool,leo.a,I...)
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76 throw(BoundsError([leo],[I...]))
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77 end
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78 return leo.a[I...] + leo.b[I...]
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79 end
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80 Base.@propagate_inbounds @inline function Base.getindex(leo::LazyElementwiseOperation{T,D,:-}, I...) where {T,D}
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81 @boundscheck if !checkbounds(Bool,leo.a,I...)
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82 throw(BoundsError([leo],[I...]))
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83 end
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84 return leo.a[I...] - leo.b[I...]
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85 end
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86 Base.@propagate_inbounds @inline function Base.getindex(leo::LazyElementwiseOperation{T,D,:*}, I...) where {T,D}
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87 @boundscheck if !checkbounds(Bool,leo.a,I...)
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88 throw(BoundsError([leo],[I...]))
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89 end
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90 return leo.a[I...] * leo.b[I...]
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91 end
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92 Base.@propagate_inbounds @inline function Base.getindex(leo::LazyElementwiseOperation{T,D,:/}, I...) where {T,D}
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93 @boundscheck if !checkbounds(Bool,leo.a,I...)
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94 throw(BoundsError([leo],[I...]))
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95 end
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96 return leo.a[I...] / leo.b[I...]
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97 end
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98
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99 # Define lazy operations for AbstractArrays. Operations constructs a LazyElementwiseOperation which
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100 # can later be indexed into. Lazy operations are denoted by the usual operator followed by a tilde
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101 Base.@propagate_inbounds +̃(a::AbstractArray{T,D},b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:+}(a,b)
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102 Base.@propagate_inbounds -̃(a::AbstractArray{T,D},b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:-}(a,b)
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103 Base.@propagate_inbounds *̃(a::AbstractArray{T,D},b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:*}(a,b)
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104 Base.@propagate_inbounds /̃(a::AbstractArray{T,D},b::AbstractArray{T,D}) where {T,D} = LazyElementwiseOperation{T,D,:/}(a,b)
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105
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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} = b + a
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108 Base.@propagate_inbounds Base.:-(a::LazyArray{T,D},b::AbstractArray{T,D}) where {T,D} = a -̃ b
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109 Base.@propagate_inbounds Base.:-(a::AbstractArray{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} = b * a
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112 # TODO: / seems to be ambiguous
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113 # Base.:/(a::LazyArray{T,D},b::AbstractArray{T,D}) where {T,D} = a /̃ b
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114 # Base.:/(a::AbstractArray{T,D},b::LazyArray{T,D}) where {T,D} = a /̃ b
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115
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116 export +̃, -̃, *̃, /̃
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117
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118
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119
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120 """
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121 LazyTensorMappingTranspose{T,R,D} <: TensorMapping{T,D,R}
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122
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123 Struct for lazy transpose of a TensorMapping.
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124
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125 If a mapping implements the the `apply_transpose` method this allows working with
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126 the transpose of mapping `m` by using `m'`. `m'` will work as a regular TensorMapping lazily calling
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127 the appropriate methods of `m`.
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128 """
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129 struct LazyTensorMappingTranspose{T,R,D} <: TensorMapping{T,D,R}
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130 tm::TensorMapping{T,R,D}
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131 end
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132 export LazyTensorMappingTranspose
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133
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134 # # TBD: Should this be implemented on a type by type basis or through a trait to provide earlier errors?
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135 Base.adjoint(t::TensorMapping) = LazyTensorMappingTranspose(t)
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136 Base.adjoint(t::LazyTensorMappingTranspose) = t.tm
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137
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138 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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139 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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140
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141 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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142 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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143
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144
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145
190
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146 # TODO: Write tests and documentation for LazyTensorMappingComposition
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147 # struct LazyTensorMappingComposition{T,R,K,D} <: TensorMapping{T,R,D}
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148 # t1::TensorMapping{T,R,K}
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149 # t2::TensorMapping{T,K,D}
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150 # end
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151
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152 # Base.:∘(s::TensorMapping{T,R,K}, t::TensorMapping{T,K,D}) where {T,R,K,D} = LazyTensorMappingComposition(s,t)
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153
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154 # function range_size(tm::LazyTensorMappingComposition{T,R,K,D}, domain_size::NTuple{D,Integer}) where {T,R,K,D}
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155 # range_size(tm.t1, domain_size(tm.t2, domain_size))
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156 # end
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157
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158 # function domain_size(tm::LazyTensorMappingComposition{T,R,K,D}, range_size::NTuple{R,Integer}) where {T,R,K,D}
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159 # domain_size(tm.t1, domain_size(tm.t2, range_size))
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160 # end
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161
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162 # function apply(c::LazyTensorMappingComposition{T,R,K,D}, v::AbstractArray{T,D}, I::Vararg) where {T,R,K,D}
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163 # apply(c.t1, LazyTensorMappingApplication(c.t2,v), I...)
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164 # end
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165
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166 # function apply_transpose(c::LazyTensorMappingComposition{T,R,K,D}, v::AbstractArray{T,D}, I::Vararg) where {T,R,K,D}
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167 # apply_transpose(c.t2, LazyTensorMappingApplication(c.t1',v), I...)
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168 # end
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169
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170 # # Have i gone too crazy with the type parameters? Maybe they aren't all needed?
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171
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172 # export →