code: def _l2_loss(*tensors):
      l2_loss = 0
      for tensor in tensors:
          l2_loss += torch.sum(tensor**2) / 2
      return l2_loss
  
file_path: cornac/cornac/models/vmf/vmf.py
imports: from tqdm.auto import tqdm
  import numpy
  import torch
  from ...utils.common import scale
  from ...utils.init_utils import normal
  from ...utils import get_rng
label_desc: Use image node_id 2 for calling a global function with example usage: _l2_loss() and returns: l2_loss