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Minor tidy: use peel rather than [1] and drop #483

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Merged
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Oct 8, 2021
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Minor tidy: use peel rather than [1] and drop #483

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4 changes: 2 additions & 2 deletions src/rule_definition_tools.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -294,8 +294,8 @@ function propagation_expr(Δs, ∂s, _conj=false, proj=identity)

# Apply `muladd` iteratively.
# Explicit multiplication is only performed for the first pair of partial and gradient.
init_expr = :(*($(_∂s[1]), $(Δs[1])))
_∂s_Δs_tail = Iterators.drop(zip(_∂s, Δs), 1)
(∂s_1, Δs_1), _∂s_Δs_tail = Iterators.peel(zip(_∂s, Δs))
init_expr = :($∂s_1 * $Δs_1)
summed_∂_mul_Δs = foldl(_∂s_Δs_tail; init=init_expr) do ex, (∂s_i, Δs_i)
:(muladd($∂s_i, $Δs_i, $ex))
end
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