code: def forward(self, x):
      identity = x
  
      out = self.conv1(x)
      out = self.bn1(out)
      out = self.activation(out)
  
      out = self.conv2(out)
      out = self.bn2(out)
  
      if self.upsample is not None:
          identity = self.upsample(x)
  
      out += identity
      out = self.activation(out)
  
      return out
  
imports: import paddle
  import paddle.nn
  import paddle.nn.functional
  from paddleseg.models import layers
  from paddleseg import utils
  from paddleseg.cvlibs import manager, param_init
  from ppmatting.models.layers import GuidedCxtAtten
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