code: def forward(self, x):
      out = self.conv1(x)
      out = self.bn1(out)
      out = self.relu(out)
      out = self.conv2(out)
      out = self.bn2(out)
  
      residual = x
      if self.downsample is not None:
          residual = self.downsample(x)
  
      out += residual
  
      return out if self.no_relu else self.relu(out)
  
imports: from functools import partial
  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
  from paddleseg.models.backbones.transformer_utils import DropPath, Identity
  from paddleseg.cvlibs.param_init import constant_init, kaiming_normal_init, trunc_normal_init
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: unknown