code: def mean_flat(tensor):
      """
      Take the mean over all non-batch dimensions.
      """
      return tensor.mean(dim=list(range(1, len(tensor.shape))))
  
imports: import math
  from typing import Optional
  import torch
  import torch.nn
  from einops import rearrange, repeat
label_desc: Use image node_id 8 for calling a global function with example usage: mean_flat(tensor) and returns: tensor