# Sign¶

Versioned name : Sign-1

Category : Arithmetic unary

Short description : Sign performs element-wise sign operation on a given input tensor.

Detailed description : Sign performs element-wise sign operation on a given input tensor, based on the following mathematical formula:

$a_{i} = sign(a_{i})$

Attributes : Sign operation has no attributes.

Inputs

• 1 : A tensor of type T and arbitrary shape. Required.

Outputs

• 1 : The result of element-wise Sign operation. A tensor of type T with mapped elements of the input tensor to -1 (if it is negative), 0 (if it is zero), or 1 (if it is positive).

Types

• T : any numeric type.

Example

<layer ... type="Sign">
<input>
<port id="0">
<dim>256</dim>
<dim>56</dim>
</port>
</input>
<output>
<port id="1">
<dim>256</dim>
<dim>56</dim>
</port>
</output>
</layer>