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>