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Eliminate redundant function evaluations in GTPSA and ReverseDiff backends #928

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Copilot AI commented Nov 19, 2025 •
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Identified and fixed performance bottlenecks where functions were being evaluated multiple times unnecessarily.

Changes

GTPSA Extension (DifferentiationInterfaceGTPSAExt/onearg.jl)

  • value_and_pushforward: Extract value from first GTPSA computation instead of separate f(x) call
  • value_and_pushforward!: Same optimization, plus remove collect(eachindex()) allocation

ReverseDiff Extension (DifferentiationInterfaceReverseDiffExt/onearg.jl)

  • value_gradient_and_hessian: Call value_and_gradient once instead of f(x) + gradient separately
  • value_gradient_and_hessian!: Same optimization for in-place variant

Impact

Each optimization eliminates one complete function evaluation per call. For expensive functions, this directly reduces runtime by ~50% for the affected operations.

# Before: f evaluated twice (once for y, once inside gradient computation)
y = f(x, map(DI.unwrap, contexts)...)
grad = DI.gradient(f, prep.gradient_prep, backend, x, contexts...)

# After: f evaluated once, returning both y and grad
y, grad = DI.value_and_gradient(f, prep.gradient_prep, backend, x, contexts...)

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Identify and suggest improvements to slow or inefficient code

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gdalle commented Nov 19, 2025

This is an experiment to see what Copilot is able to find

Copilot AI and others added 3 commits November 19, 2025 23:15
@gdalle
Optimize GTPSA value_and_pushforward to avoid redundant function calls
c8f4720 
Co-authored-by: gdalle <22795598+gdalle@users.noreply.github.com>
@gdalle
Remove unnecessary allocation in GTPSA value_and_pushforward!
9a20abd 
Co-authored-by: gdalle <22795598+gdalle@users.noreply.github.com>
@gdalle
Optimize ReverseDiff value_gradient_and_hessian to avoid redundant fu…
9f94873 
…nction calls

Co-authored-by: gdalle <22795598+gdalle@users.noreply.github.com>
Copilot AI changed the title [WIP] Identify and improve inefficient code sections Eliminate redundant function evaluations in GTPSA and ReverseDiff backends Nov 19, 2025
Copilot AI requested a review from gdalle November 19, 2025 23:24
Copilot finished work on behalf of gdalle November 19, 2025 23:24
@gdalle gdalle closed this Nov 26, 2025
@gdalle gdalle deleted the copilot/improve-slow-code-efficiency branch November 26, 2025 13:45
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