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fix sigmoid implementation bug #523

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fix sigmoid implementation bug #523

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2 changes: 1 addition & 1 deletion csrc/velox/functions/numeric_functions.h
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Original file line number Diff line number Diff line change
Expand Up @@ -192,7 +192,7 @@ struct sigmoid {
template <typename TOutput, typename TInput = TOutput>
FOLLY_ALWAYS_INLINE bool call(TOutput& result, const TInput& x) {
if (x >= 0) {
result = 1 / (1 + exp(x));
result = 1 / (1 + exp(-x));
} else {
const auto z = exp(x);
result = z / (1 + z);
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