code: def forward(self, x, mask):
      b, _, h, w = x.shape
      x = self.trans_layer(x)
      x = self.channel_att(x)
      x = self.pred_layer(x)
  
      if mask is not None:
          x = x * mask
      x = paddle.reshape(x, [b, self.out_channel, -1])
      x1 = paddle.sum(x, axis=-1)
  
      return x1, paddle.reshape(x, [b, self.out_channel, h, w])
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import paddle.nn
  import paddle
  import math
label_desc: Use image node_id 2 for calling the CountingDecoder obj's underlying member method code with example usage: obj.forward(x, mask) and returns: x1,  paddle