code: def forward(self, x):
      identity = x
  
      out = self.conv1(x)
      out = self.bn1(out)
      out = self.relu(out)
  
      out = self.conv2(out)
      out = self.bn2(out)
  
      if self.downsample is not None:
          identity = self.downsample(x)
  
      out += identity
      out = self.relu(out)
  
      return out
  
imports: from __future__ import division
  from __future__ import print_function
  import paddle
  import paddle.nn
  from paddle.utils.download import get_weights_path_from_url
  from ppdet.core.workspace import register, serializable
  from ..shape_spec import ShapeSpec
label_desc: Use image node_id 2 for calling the BasicBlock obj's underlying member method code with example usage: obj.forward(x) and returns: out