code: def scale_l2(X, C, S):
      S = S.view(1, 1, C.size(0), 1)
      X = X.unsqueeze(2).expand(
          X.size(0), X.size(1), C.size(0), C.size(1)
      )
      C = C.unsqueeze(0).unsqueeze(0)
      SL = S * (X - C)
      SL = SL.pow(2).sum(3)
      return SL
  
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 5 for calling the Encoding obj's underlying member method code with example usage: obj.scale_l2(X, C, S) and returns: SL