code: def pc_normalize(pc):
      centroid = np.mean(pc, axis=0)
      pc = pc - centroid
      m = np.max(np.sqrt(np.sum(pc**2, axis=1)))
      pc = pc / m
      return pc
  
file_path: dgl/examples/pytorch/pointcloud/pct/ModelNetDataLoader.py
imports: import os
  import warnings
  import numpy
  from torch.utils.data import Dataset
label_desc: Use image node_id 1 for calling a global function with example usage: pc_normalize(pc) and returns: pc