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Eye <a name=”Eye”></a>

Versioned name : Eye-9

Category : Generation

Short description : Eye operation generates shift matrix or a batch of matrices.

Detailed description :

Eye operation generates an identity matrix or a batch matrices with ones on the diagonal and zeros everywhere else. The index of the diagonal to be populated with ones is given by diagonal_index : output[..., i, i + diagonal_index] = 1.

Example 1. Eye output with output_type = i32 :

num_rows = 3

num_columns = 4

diagonal_index = 2

output  = [[0 0 1 0]
           [0 0 0 1]
           [0 0 0 0]]

Example 2. Eye output with output_type = i32 :

num_rows = 3

num_columns = 4

diagonal_index = -1

output  = [[0 0 0 0]
           [1 0 0 0]
           [0 1 0 0]]

Example 3. Eye output with output_type = f16 :

num_rows = 2

diagonal_index = 5

batch_shape = [1, 2]

output  = [[[[0. 0.]
             [0. 0.]]
            [[0. 0.]
             [0. 0.]]]]

Attributes :

  • output_type

    • Description : the type of the output

    • Range of values : any numeric type

    • Type : string

    • Required : Yes

Inputs :

  • 1 : num_rows - scalar or 1D tensor with 1 non-negative element of type T_NUM describing the number of rows in matrix. Required.

  • 2 : num_columns - scalar or 1D tensor with 1 non-negative element of type T_NUM describing the number of columns in matrix. Required.

  • 3 : diagonal_index - scalar or 1D tensor with element of type T_NUM describing the index of the diagonal to be populated. A positive value refers to an upper diagonal and a negative value refers to a lower diagonal. Value 0 populates the main diagonal. If diagonal_index is a positive value and is not smaller than num_rows or if diagonal_index is a negative value and is not larger than num_columns, the matrix will be filled with only zeros. Required.

  • 4 : batch_shape - 1D tensor with non-negative values of type T_NUM defines leading batch dimensions of output shape. If batch_shape is an empty list, Eye operation generates a 2D tensor (matrix). This input is optional, and its default value equal to an empty tensor.

Outputs :

  • 1 : A tensor with the type specified by the output_type attribute. The shape is batch_shape + [num_rows, num_columns]

Types

  • T_NUM : int32 or int64.

Examples

Example 1

<layer ... name="Eye" type="Eye">
    <data output_type="i8"/>
    <input>
        <port id="0" precision="I32"/>  <!-- num rows: 5 -->
        <port id="1" precision="I32"/>  <!-- num columns: 5 -->
        <port id="2" precision="I32"/>  <!-- diagonal index -->
    </input>
    <output>
        <port id="3" precision="I8" names="Eye:0">
            <dim>5</dim>
            <dim>5</dim>
        </port>
    </output>
</layer>

Example 2

<layer ... name="Eye" type="Eye">
    <data output_type="f32"/>
    <input>
        <port id="0" precision="I32"/>  <!-- num rows -->
        <port id="1" precision="I32"/>  <!-- num columns -->
        <port id="2" precision="I32"/>  <!-- diagonal index -->
        <port id="3" precision="I32"/>  <!-- batch_shape : [2, 3] -->
    </input>
    <output>
        <port id="3" precision="F32" names="Eye:0">
            <dim>2</dim>
            <dim>3</dim>
            <dim>-1</dim>
            <dim>-1</dim>
        </port>
    </output>
</layer>
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