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Add tip on common subexpressions #650

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Nov 30, 2024
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Add tip on common subexpressions #650

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6 changes: 6 additions & 0 deletions docs/tips.md
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Expand Up @@ -46,3 +46,9 @@ The distance calculation's square root is nonlinear and has a limited domain,
whereas sum-of-squares has the same minimum, is quadratic, and has no domain
restriction. In other words, use `minimize(x ** 2 + y ** 2 + z ** 2)` instead of
`minimize(hypot(x, y, z))`.

## Deduplicating autodiff work

Store common subexpressions in intermediate variables and reuse them instead of
writing out the subexpressions each time. This ensures common subexpressions in
the expression tree are only traversed and updated once.