code: def forward(self, x):
      conv = x
      for block_func in self.bottleneck_block_list:
          conv = block_func(conv)
      return conv
  
imports: import math
  import paddle
  import paddle.nn
  import paddle.nn.functional
  from .layers import ConvBNReLU, ConvBN
label_desc: Use image node_id 2 for calling the Layer1 obj's underlying member method code with example usage: obj.forward(x) and returns: conv