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annotate src/LazyTensors/lazy_tensor_operations.jl @ 434:648a36ebac99 feature/lazy_identity

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Change name from LazyIdentity to IdentityMapping
author Jonatan Werpers <jonatan@werpers.com>
date Mon, 19 Oct 2020 09:51:56 +0200
parents 7327a3e41df0
children 00c317c9ccfb 27e0e256e5d9
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1 """
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2 LazyTensorMappingApplication{T,R,D} <: LazyArray{T,R}
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3
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4 Struct for lazy application of a TensorMapping. Created using `*`.
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5
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6 Allows the result of a `TensorMapping` applied to a vector to be treated as an `AbstractArray`.
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7 With a mapping `m` and a vector `v` the LazyTensorMappingApplication object can be created by `m*v`.
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8 The actual result will be calcualted when indexing into `m*v`.
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9 """
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10 struct LazyTensorMappingApplication{T,R,D, TM<:TensorMapping{T,R,D}, AA<:AbstractArray{T,D}} <: LazyArray{T,R}
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11 t::TM
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12 o::AA
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13 end
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14 # TODO: Do boundschecking on creation!
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15 export LazyTensorMappingApplication
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16
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17 # TODO: Go through and remove unneccerary type parameters on functions
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18
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19 Base.:*(tm::TensorMapping{T,R,D}, o::AbstractArray{T,D}) where {T,R,D} = LazyTensorMappingApplication(tm,o)
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20 Base.getindex(ta::LazyTensorMappingApplication{T,R,D}, I::Vararg{Index,R}) where {T,R,D} = apply(ta.t, ta.o, I...)
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21 Base.getindex(ta::LazyTensorMappingApplication{T,R,D}, I::Vararg{Int,R}) where {T,R,D} = apply(ta.t, ta.o, Index{Unknown}.(I)...)
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22 Base.size(ta::LazyTensorMappingApplication) = range_size(ta.t)
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23 # TODO: What else is needed to implement the AbstractArray interface?
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24
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25 # # We need the associativity to be a→b→c = a→(b→c), which is the case for '→'
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26 Base.:*(a::TensorMapping{T,R,D}, b::TensorMapping{T,D,K}, args::Union{TensorMapping{T}, AbstractArray{T}}...) where {T,R,D,K} = foldr(*,(a,b,args...))
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27 # # Should we overload some other infix binary opesrator?
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28 # →(tm::TensorMapping{T,R,D}, o::AbstractArray{T,D}) where {T,R,D} = LazyTensorMappingApplication(tm,o)
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29 # TODO: We need to be really careful about good error messages.
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30 # For example what happens if you try to multiply LazyTensorMappingApplication with a TensorMapping(wrong order)?
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31
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32 """
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33 LazyTensorMappingTranspose{T,R,D} <: TensorMapping{T,D,R}
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34
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35 Struct for lazy transpose of a TensorMapping.
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36
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37 If a mapping implements the the `apply_transpose` method this allows working with
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38 the transpose of mapping `m` by using `m'`. `m'` will work as a regular TensorMapping lazily calling
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39 the appropriate methods of `m`.
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40 """
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41 struct LazyTensorMappingTranspose{T,R,D} <: TensorMapping{T,D,R}
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42 tm::TensorMapping{T,R,D}
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43 end
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44 export LazyTensorMappingTranspose
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45
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46 # # TBD: Should this be implemented on a type by type basis or through a trait to provide earlier errors?
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47 # Jonatan 2020-09-25: Is the problem that you can take the transpose of any TensorMapping even if it doesn't implement `apply_transpose`?
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48 Base.adjoint(tm::TensorMapping) = LazyTensorMappingTranspose(tm)
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49 Base.adjoint(tmt::LazyTensorMappingTranspose) = tmt.tm
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50
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51 apply(tmt::LazyTensorMappingTranspose{T,R,D}, v::AbstractArray{T,R}, I::Vararg{Index,D}) where {T,R,D} = apply_transpose(tmt.tm, v, I...)
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52 apply_transpose(tmt::LazyTensorMappingTranspose{T,R,D}, v::AbstractArray{T,D}, I::Vararg{Index,R}) where {T,R,D} = apply(tmt.tm, v, I...)
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53
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54 range_size(tmt::LazyTensorMappingTranspose) = domain_size(tmt.tm)
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55 domain_size(tmt::LazyTensorMappingTranspose) = range_size(tmt.tm)
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57
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58 struct LazyTensorMappingBinaryOperation{Op,T,R,D,T1<:TensorMapping{T,R,D},T2<:TensorMapping{T,R,D}} <: TensorMapping{T,D,R}
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59 tm1::T1
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60 tm2::T2
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61
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62 @inline function LazyTensorMappingBinaryOperation{Op,T,R,D}(tm1::T1,tm2::T2) where {Op,T,R,D, T1<:TensorMapping{T,R,D},T2<:TensorMapping{T,R,D}}
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63 return new{Op,T,R,D,T1,T2}(tm1,tm2)
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64 end
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65 end
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66 # TODO: Boundschecking in constructor.
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67
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68 apply(tmBinOp::LazyTensorMappingBinaryOperation{:+,T,R,D}, v::AbstractArray{T,D}, I::Vararg{Index,R}) where {T,R,D} = apply(tmBinOp.tm1, v, I...) + apply(tmBinOp.tm2, v, I...)
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69 apply(tmBinOp::LazyTensorMappingBinaryOperation{:-,T,R,D}, v::AbstractArray{T,D}, I::Vararg{Index,R}) where {T,R,D} = apply(tmBinOp.tm1, v, I...) - apply(tmBinOp.tm2, v, I...)
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70
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71 range_size(tmBinOp::LazyTensorMappingBinaryOperation{Op,T,R,D}) where {Op,T,R,D} = range_size(tmBinOp.tm1)
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72 domain_size(tmBinOp::LazyTensorMappingBinaryOperation{Op,T,R,D}) where {Op,T,R,D} = domain_size(tmBinOp.tm1)
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73
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74 Base.:+(tm1::TensorMapping{T,R,D}, tm2::TensorMapping{T,R,D}) where {T,R,D} = LazyTensorMappingBinaryOperation{:+,T,R,D}(tm1,tm2)
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75 Base.:-(tm1::TensorMapping{T,R,D}, tm2::TensorMapping{T,R,D}) where {T,R,D} = LazyTensorMappingBinaryOperation{:-,T,R,D}(tm1,tm2)
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76
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77 """
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78 TensorMappingComposition{T,R,K,D}
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79
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80 Lazily compose two TensorMappings, so that they can be handled as a single TensorMapping.
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81 """
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82 struct TensorMappingComposition{T,R,K,D, TM1<:TensorMapping{T,R,K}, TM2<:TensorMapping{T,K,D}} <: TensorMapping{T,R,D}
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83 t1::TM1
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84 t2::TM2
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85
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86 @inline function TensorMappingComposition(t1::TensorMapping{T,R,K}, t2::TensorMapping{T,K,D}) where {T,R,K,D}
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87 @boundscheck if domain_size(t1) != range_size(t2)
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88 throw(DimensionMismatch("the first argument has domain size $(domain_size(t1)) while the second has range size $(range_size(t2)) "))
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89 end
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90 return new{T,R,K,D, typeof(t1), typeof(t2)}(t1,t2)
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91 end
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92 # Add check for matching sizes as a boundscheck
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93 end
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94 export TensorMappingComposition
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95
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96 range_size(tm::TensorMappingComposition) = range_size(tm.t1)
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97 domain_size(tm::TensorMappingComposition) = domain_size(tm.t2)
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98
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99 function apply(c::TensorMappingComposition{T,R,K,D}, v::AbstractArray{T,D}, I::Vararg{S,R} where S) where {T,R,K,D}
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100 apply(c.t1, c.t2*v, I...)
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101 end
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102
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103 function apply_transpose(c::TensorMappingComposition{T,R,K,D}, v::AbstractArray{T,R}, I::Vararg{S,D} where S) where {T,R,K,D}
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104 apply_transpose(c.t2, c.t1'*v, I...)
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105 end
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106
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107 Base.@propagate_inbounds Base.:∘(s::TensorMapping, t::TensorMapping) = TensorMappingComposition(s,t)
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108
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109 """
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110 LazyLinearMap{T,R,D,...}(A, range_indicies, domain_indicies)
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111
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112 TensorMapping defined by the AbstractArray A. `range_indicies` and `domain_indicies` define which indicies of A should
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113 be considerd the range and domain of the TensorMapping. Each set of indices must be ordered in ascending order.
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114
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115 For instance, if A is a m x n matrix, and range_size = (1,), domain_size = (2,), then the LazyLinearMap performs the
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116 standard matrix-vector product on vectors of size n.
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117 """
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118 struct LazyLinearMap{T,R,D, RD, AA<:AbstractArray{T,RD}} <: TensorMapping{T,R,D}
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119 A::AA
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120 range_indicies::NTuple{R,Int}
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121 domain_indicies::NTuple{D,Int}
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122
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123 function LazyLinearMap(A::AA, range_indicies::NTuple{R,Int}, domain_indicies::NTuple{D,Int}) where {T,R,D, RD, AA<:AbstractArray{T,RD}}
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124 if !issorted(range_indicies) || !issorted(domain_indicies)
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125 throw(DomainError("range_indicies and domain_indicies must be sorted in ascending order"))
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126 end
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127
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128 return new{T,R,D,RD,AA}(A,range_indicies,domain_indicies)
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129 end
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130 end
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131 export LazyLinearMap
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132
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133 range_size(llm::LazyLinearMap) = size(llm.A)[[llm.range_indicies...]]
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134 domain_size(llm::LazyLinearMap) = size(llm.A)[[llm.domain_indicies...]]
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135
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136 function apply(llm::LazyLinearMap{T,R,D}, v::AbstractArray{T,D}, I::Vararg{Index,R}) where {T,R,D}
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137 view_index = ntuple(i->:,ndims(llm.A))
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138 for i ∈ 1:R
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139 view_index = Base.setindex(view_index, Int(I[i]), llm.range_indicies[i])
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140 end
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141 A_view = @view llm.A[view_index...]
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142 return sum(A_view.*v)
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143 end
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144
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145 function apply_transpose(llm::LazyLinearMap{T,R,D}, v::AbstractArray{T,R}, I::Vararg{Index,D}) where {T,R,D}
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146 apply(LazyLinearMap(llm.A, llm.domain_indicies, llm.range_indicies), v, I...)
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147 end
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148
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149
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150 """
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151 IdentityMapping{T,D} <: TensorMapping{T,D,D}
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152
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153 The lazy identity TensorMapping for a given size. Usefull for building up higher dimensional tensor mappings from lower
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154 dimensional ones through outer products. Also used in the Implementation for InflatedTensorMapping.
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155 """
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156 struct IdentityMapping{T,D} <: TensorMapping{T,D,D}
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157 size::NTuple{D,Int}
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158 end
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159 export IdentityMapping
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160
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161 IdentityMapping{T}(size::NTuple{D,Int}) where {T,D} = IdentityMapping{T,D}(size)
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162
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163 range_size(tmi::IdentityMapping) = tmi.size
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164 domain_size(tmi::IdentityMapping) = tmi.size
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165
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166 apply(tmi::IdentityMapping{T,D}, v::AbstractArray{T,D}, I::Vararg{Any,D}) where {T,D} = v[I...]
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167 apply_transpose(tmi::IdentityMapping{T,D}, v::AbstractArray{T,D}, I::Vararg{Any,D}) where {T,D} = v[I...]
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168