code: def forward(self, x):
      y = []
      for i, x_i in enumerate(paddle.chunk(x, self.scale, axis=1)):
          if i == 0:
              y_i = x_i
          elif i == 1:
              y_i = self.blocks[i - 1](x_i)
          else:
              y_i = self.blocks[i - 1](x_i + y_i)
          y.append(y_i)
      y = paddle.concat(y, axis=1)
      return y
  
imports: import math
  import os
  import paddle
  import paddle.nn
  import paddle.nn.functional
label_desc: Use image node_id 2 for calling the Res2NetBlock obj's underlying member method code with example usage: obj.forward(x) and returns: y