Interpolate

Interpolate#

General#

Interpolate layer performs interpolation on \(\src\) tensor at spatial dimensions.

Operation attributes#

Attribute Name

Description

Value Type

Supported Values

Required or Optional

mode

Specifies type of interpolation.

string

nearest , linear , bilinear , trilinear

Required

coordinate_transformation_mode

Specifies how to transform the coordinate in the resized tensor to the coordinate in the original tensor.

string

half_pixel (default), align_corners

Optional

sizes

Specifies dst shape for spatial axes.

s64

A s64 list containing positive values, none is default

Optional

scales

Specifies scales for spatial axes.

f32

A f32 list, none is default

Optional

data_format

Controls how to interpret the shape of src and dst .

string

NCX , NXC (default)

Optional

Note

Either sizes or scales should be provided. When sizes is used, scales will be ignored.

Note

The attribute coordinate_transformation_mode is the name of transformation mode in string format.

Here scale[x] is dst_shape[x]/src_shape[x] and x_resized is a coordinate in axis x,for any axis x from the src axis.

For half_pixel : the coordinate in the original tensor axis x is calculated as ((x_resized + 0.5) / scale[x]) - 0.5.

For align_corners : the coordinate in the original tensor axis x is calculated as 0 if dst_shape[x] == 1 else x_resized * (src_shape[x] - 1) / (dst_shape[x] - 1).

Execution arguments#

The inputs and outputs must be provided according to below index order when constructing an operation.

Inputs#

Index

Argument Name

Required or Optional

0

src

Required

1

sizes

Optional

Note

sizes is a 1D tensor describing output shape for spatial axes. It is a non-differentiable tensor.

Outputs#

Index

Argument Name

Required or Optional

0

dst

Required

Note

The shape of the dst matches src shape except spatial dimensions. For spatial dimensions, they should match sizes from sizes or calculated from scales attribute.

Supported data types#

Interpolate operation supports the following data type combinations.

Src

Dst

Sizes

f32

f32

s32

bf16

bf16

s32

f16

f16

s32
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