code: def forward(self, x1):
      x1 = x1 + self.drop_path(self.attn(x1))
      x1 = x1 + self.drop_path(self.mlp(x1))
      return x1
  
imports: import paddle
  import paddle.nn
  import paddle.nn.functional
  from paddleseg.cvlibs import manager, param_init
  from paddleseg.models import layers
  from paddleseg.models.backbones.transformer_utils import DropPath, zeros_, ones_
  from paddleseg.utils import utils
label_desc: Use image node_id 2 for calling the Block obj's underlying member method code with example usage: obj.forward(x1) and returns: x1