pytorch中的上采樣以及各種反操作,求逆操作詳解-創(chuàng)新互聯(lián)

import torch.nn.functional as F

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import torch.nn as nn

F.upsample(input, size=None, scale_factor=None,mode='nearest', align_corners=None)

  r"""Upsamples the input to either the given :attr:`size` or the given
  :attr:`scale_factor`
  The algorithm used for upsampling is determined by :attr:`mode`.
  Currently temporal, spatial and volumetric upsampling are supported, i.e.
  expected inputs are 3-D, 4-D or 5-D in shape.
  The input dimensions are interpreted in the form:
  `mini-batch x channels x [optional depth] x [optional height] x width`.
  The modes available for upsampling are: `nearest`, `linear` (3D-only),
  `bilinear` (4D-only), `trilinear` (5D-only)
  Args:
    input (Tensor): the input tensor
    size (int or Tuple[int] or Tuple[int, int] or Tuple[int, int, int]):
      output spatial size.
    scale_factor (int): multiplier for spatial size. Has to be an integer.
    mode (string): algorithm used for upsampling:
      'nearest' | 'linear' | 'bilinear' | 'trilinear'. Default: 'nearest'
    align_corners (bool, optional): if True, the corner pixels of the input
      and output tensors are aligned, and thus preserving the values at
      those pixels. This only has effect when :attr:`mode` is `linear`,
      `bilinear`, or `trilinear`. Default: False
  .. warning::
    With ``align_corners = True``, the linearly interpolating modes
    (`linear`, `bilinear`, and `trilinear`) don't proportionally align the
    output and input pixels, and thus the output values can depend on the
    input size. This was the default behavior for these modes up to version
    0.3.1. Since then, the default behavior is ``align_corners = False``.
    See :class:`~torch.nn.Upsample` for concrete examples on how this
    affects the outputs.
  """

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