Versioned name: Sigmoid-1

Category: Activation function

Short description: Sigmoid element-wise activation function.

Detailed description: Reference

Attributes: Sigmoid operation has no attributes.

Mathematical Formulation

For each element from the input tensor calculates corresponding element in the output tensor with the following formula:

\[ sigmoid( x ) = \frac{1}{1+e^{-x}} \]


  • 1: Input tensor x of any floating point type. Required.


  • 1: Result of Sigmoid function applied to the input tensor x. Floating point tensor with shape and type matching the input tensor.


<layer ... type="Sigmoid">
<port id="0">
<port id="1">