Range¶

Versioned name : Range-1

Category : Generation

Short description : Range operation generates a sequence of numbers according input values [start, stop) with a step.

Attributes :

No attributes available.

Inputs :

1 : “start” - A scalar of type T. Required.
2 : “stop” - A scalar of type T. Required.
3 : “step” - A scalar of type T. Required.

Outputs :

1 : A tensor of type T.

Types

T : any numeric type.

Detailed description :

Range operation generates a sequence of numbers starting from the value in the first input (start) up to but not including the value in the second input (stop) with a step equal to the value in the third input, according to the following formula:

For a positive step :

\[start<=val[i]<stop,\]

for a negative step :

\[start>=val[i]>stop,\]

where

\[val[i]=start+i\*step\]

Examples

Example 1: positive step

<layer ... type="Range">
    <input>
        <port id="0">  <!-- start value: 2 -->
        </port>
        <port id="1">  <!-- stop value: 23 -->
        </port>
        <port id="2">  <!-- step value: 3 -->
        </port>
    </input>
    <output>
        <port id="3">
            <dim>7</dim> <!-- [ 2,  5,  8, 11, 14, 17, 20] -->
        </port>
    </output>
</layer>

Example 2: negative step

<layer ... type="Range">
    <input>
        <port id="0">  <!-- start value: 23 -->
        </port>
        <port id="1">  <!-- stop value: 2 -->
        </port>
        <port id="2">  <!-- step value: -3 -->
        </port>
    </input>
    <output>
        <port id="3">
            <dim>7</dim> <!-- [23, 20, 17, 14, 11, 8, 5] -->
        </port>
    </output>
</layer>