Mercurial > repos > public > sbplib_julia
diff src/LazyTensors/lazy_tensor_operations.jl @ 429:46acb2560451 feature/lazy_identity
Start implementing LazyIdentity
author | Jonatan Werpers <jonatan@werpers.com> |
---|---|
date | Sun, 18 Oct 2020 22:30:17 +0200 |
parents | 4aa59af074ef |
children | 541c16a8c791 904aae1899df |
line wrap: on
line diff
--- a/src/LazyTensors/lazy_tensor_operations.jl Sun Oct 18 22:21:43 2020 +0200 +++ b/src/LazyTensors/lazy_tensor_operations.jl Sun Oct 18 22:30:17 2020 +0200 @@ -141,3 +141,24 @@ function apply_transpose(llm::LazyLinearMap{T,R,D}, v::AbstractArray{T,R}, I::Vararg{Index,D}) where {T,R,D} apply(LazyLinearMap(llm.A, llm.domain_indicies, llm.range_indicies), v, I...) end + + +""" + LazyIdentity{T,D} <: TensorMapping{T,D,D} + +The lazy identity TensorMapping for a given size. Usefull for building up higher dimensional tensor mappings from lower +dimensional ones through outer products. Also used in the Implementation for InflatedTensorMapping. +""" +struct LazyIdentity{T,D} <: TensorMapping{T,D,D} + size::NTuple{D,Int} +end +export LazyIdentity + +LazyIdentity{T}(size::NTuple{D,Int}) where {T,D} = LazyIdentity{T,D}(size) + +range_size(tmi::LazyIdentity) = tmi.size +domain_size(tmi::LazyIdentity) = tmi.size + +apply(tmi::LazyIdentity{T,D}, v::AbstractArray{T,D}, I::Vararg{Index,D}) where {T,D} = v[Int.(I)...] +apply_transpose(tmi::LazyIdentity{T,D}, v::AbstractArray{T,D}, I::Vararg{Index,D}) where {T,D} = v[Int.(I)...] +