UpsamplingNearest2d

class torch.nn.UpsamplingNearest2d(size=None, scale_factor=None)

Applies a 2D nearest neighbor upsampling to an input signal composed of several input channels.

To specify the scale, it takes either the size or the scale_factor as it’s constructor argument.

When size is given, it is the output size of the image (h, w).

Parameters:

• size (int or Tuple[int, int], optional) – output spatial sizes

• scale_factor (float or Tuple[float, float], optional) – multiplier for spatial size.

Warning

This class is deprecated in favor of interpolate().

Shape:

• Input: $(N, C, H_{in}, W_{in})$

• Output: $(N, C, H_{out}, W_{out})$ where

$$H_{out} = \left\lfloor H_{in} \times \text{scale\_factor} \right\rfloor$$

$$W_{out} = \left\lfloor W_{in} \times \text{scale\_factor} \right\rfloor$$

Examples:

>>> input = torch.arange(1, 5, dtype=torch.float32).view(1, 1, 2, 2)
>>> input
tensor([[[[1., 2.],
          [3., 4.]]]])

>>> m = nn.UpsamplingNearest2d(scale_factor=2)
>>> m(input)
tensor([[[[1., 1., 2., 2.],
          [1., 1., 2., 2.],
          [3., 3., 4., 4.],
          [3., 3., 4., 4.]]]])