code: def forward(self, x):
      residual = x
      conv1 = self.conv1(x)
      conv2 = self.conv2(conv1)
  
      if self.downsample:
          residual = self.conv_down(x)
  
      if self.has_se:
          conv2 = self.se(conv2)
  
      y = conv2 + residual
      y = F.relu(y)
      return y
  
imports: import math
  import paddle
  import paddle.nn
  import paddle.nn.functional
  from paddleseg.cvlibs import manager, param_init
  from paddleseg.models import layers
  from paddleseg.utils import utils
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: y