E.V.E
v2023.02.15
 
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◆ sigmoid

auto eve::sigmoid = functor<sigmoid_t>
inlineconstexpr

Header file

#include <eve/module/math.hpp>

Callable Signatures

namespace eve
{
// Regular overload
constexpr auto sigmoid(floating_value auto x) noexcept; // 1
// Lanes masking
constexpr auto sigmoid[conditional_sigmoidr auto c](floating_value auto x) noexcept; // 2
constexpr auto sigmoid[logical_value auto m](floating_value auto x) noexcept; // 2
}
The concept floating_value<T> is satisfied if and only if T satisfies eve::value and the element type...
Definition value.hpp:116
The concept logical_value<T> is satisfied if and only if T satisfies eve::value and the element type ...
Definition value.hpp:132
constexpr auto sigmoid
elementwise_callable object computing the sigmoid (logistic function).
Definition sigmoid.hpp:75
EVE Main Namespace.
Definition abi.hpp:18

Parameters

Return value

  1. Returns the elementwise sigmoid of the input. In particular:
    • If the element is \(1/2\), \(1\) is returned
    • If the element is \(-\infty\), \(+0\) is returned
    • If the element is \(\infty\), \(1\) is returned
    • If the element is a NaN, NaN is returned
  2. The operation is performed conditionnaly.

External references

Example

// revision 1
#include <eve/module/math.hpp>
#include <iostream>
int main()
{
eve::wide wf = {0.0f, -0.0f, -1.0f, 1.0f, 2.0f,
std::cout << "<- wf = " << wf << "\n";
std::cout << "-> sigmoid(wf) = " << eve::sigmoid(wf) << "\n";
std::cout << "-> sigmoid[ignore_last(2)](wf)= " << eve::sigmoid[eve::ignore_last(2)](wf) << "\n";
std::cout << "-> sigmoid[wf != 2.0f](wf) = " << eve::sigmoid[wf != 2.0f](wf) << "\n";
}
constexpr auto nan
Computes the IEEE quiet NaN constant.
Definition nan.hpp:67
constexpr auto inf
Computes the infinity ieee value.
Definition inf.hpp:66
constexpr auto minf
Computes the -infinity ieee value.
Definition minf.hpp:66
Lightweight type-wrapper.
Definition as.hpp:29
Conditional expression ignoring the k last lanes from a eve::simd_value.
Definition conditional.hpp:332
Wrapper for SIMD registers.
Definition wide.hpp:70