code: def forward(self, x):
      b, c, h, w = x.shape
  
      channels_per_group = c // self.groups
  
      # reshape
      x = paddle.reshape(x, [b, self.groups, channels_per_group, h, w])
  
      x = paddle.transpose(x, (0, 2, 1, 3, 4))
      out = paddle.reshape(x, [b, -1, h, w])
  
      return out
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import paddle
  import paddle.nn
  from ppocr.modeling.backbones.det_mobilenet_v3 import make_divisible
label_desc: Use image node_id 2 for calling the ChannelShuffle obj's underlying member method code with example usage: obj.forward(x) and returns: out