Split

Versioned name: Split-1

Category: Data movement operations

Short description: Split operation splits an input tensor into pieces of the same length along some axis.

Attributes

• num_splits
  • Description: it specifies the number of outputs into which the initial "*data*" tensor will be split along *"axis"*
  • Range of values: a positive integer less than or equal to the size of the dimension being split over
  • Type: any integer type
  • Default value: None
  • Required: Yes

Inputs

• 1: "data" - A tensor of type T1. Required.
• 2: "axis" - axis along *"data"* to split. A scalar of type T2 with value from range -rank(data) .. rank(data)-1. Negative values address dimensions from the end. Required.

Outputs

• Multiple outputs: Tensors of the same type as the 1st input tensor. The shape of the i-th output has the same shape as the *"data"* except along dimension *"axis"* where the size is data.shape[i]/num_splits.

Detailed Description

Split operation splits the *"data"* input tensor into pieces of the same length along *"axis"*. The i-th shape of output tensor will be equal to the *"data"* shape except along dimension *"axis"* where the shape will be data.shape[i]/num_splits. The sum of elements of split_lengths must match data.shape[axis].

Shape of output tensor will be:

\[ shape_output_tensor = shape_input_tensor[shape_input_tensor[0], shape_input_tensor[1], ... ,split_lengths[axis], ... shape_input_tensor[D-1]], where D rank of input tensor. \]

Types

• T1: arbitrary supported type.
• T2: any integer type.

Example

<layer id="1" type="Split" ...>
    <data num_splits="3" />
    <input>
        <port id="0">       <!-- some data -->
            <dim>6</dim>
            <dim>12</dim>
            <dim>10</dim>
            <dim>24</dim>
        </port>
        <port id="1">       <!-- axis: 1 -->
        </port>
    </input>
    <output>
        <port id="2">
            <dim>6</dim>
            <dim>4</dim>
            <dim>10</dim>
            <dim>24</dim>
        </port>
        <port id="3">
            <dim>6</dim>
            <dim>4</dim>
            <dim>10</dim>
            <dim>24</dim>
        </port>
        <port id="4">
            <dim>6</dim>
            <dim>4</dim>
            <dim>10</dim>
            <dim>24</dim>
        </port>
    </output>
</layer>