code: def mean_flat(tensor):
      """
      https://github.com/openai/guided-diffusion/blob/27c20a8fab9cb472df5d6bdd6c8d11c8f430b924/guided_diffusion/nn.py#L86
      Take the mean over all non-batch dimensions.
      """
      return tensor.mean(dim=list(range(1, len(tensor.shape))))
  
file_path: ColossalAI/examples/images/diffusion/ldm/util.py
imports: import importlib
  from inspect import isfunction
  import numpy
  import torch
  from PIL import Image, ImageDraw, ImageFont
  from torch import optim
label_desc: Use image node_id 6 for calling a global function with example usage: mean_flat(tensor) and returns: tensor