code: def __init__(self, dim, keep_dim=False):
      super(Mean, self).__init__()
      self.dim = dim
      self.keep_dim = keep_dim
  
imports: import torch
  import torch.nn
  import torch.nn.functional
  from pywick.models.segmentation.da_basenets.segbase import SegBaseModel
  from pywick.models.segmentation.da_basenets.fcn import _FCNHead
label_desc: Use image node_id 1 to create a new Mean object from inherited base classes: nn with example: obj = Mean(dim, keep_dim)