JuliaDiff / JuliaDiff/ChainRulesCore.jl

Defined dot on Composite

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LinearOperators pending-clear-need Structural Tangent
Dominant language
Julia
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Description

Follow up to https://github.com/JuliaDiff/ChainRulesCore.jl/pull/201

Dot its defined recursively, (like adjoint and transpose).

julia> using LinearAlgebra

julia> x = [1, 10];

julia> y = [x, x]
2-element Vector{Vector{Int64}}:
 [1, 10]
 [1, 10]


julia> dot(y,y)
202

It that should have a natural defintion for Composites, even for Composites of Composites.

It seems like a thing that is generally defined on vector spaces.

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reviewing PR #201 and the existing Composite behavior, then compare how dot, adjoint, and transpose are defined recursively. Verify the intended behavior with nested Composites, including the shown nested-vector example, and add coverage demonstrating that dot works at each nesting level.

Written by the indexing model from the issue text.

Assessment

Tech stack
julia
Domain
machine-learning
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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