code: def aggregate(A, X, C):
      A = A.unsqueeze(3)
      X = X.unsqueeze(2).expand(
          X.size(0), X.size(1), C.size(0), C.size(1)
      )
      C = C.unsqueeze(0).unsqueeze(0)
      E = A * (X - C)
      E = E.sum(1)
      return E
  
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 6 for calling the Encoding obj's underlying member method code with example usage: obj.aggregate(A, X, C) and returns: E