class_docstr: Dataset
      
code: def get_stats(self):
      return {"mean": self.mean, "std": self.std}
  
file_path: PGL/legacy/examples/stgcn/data_loader/data_utils.py
imports: import numpy
  import pandas
  from utils.math_utils import z_score
label_desc: Use image node_id 3 for calling the Dataset obj's underlying member method code with example usage: obj.get_stats() and returns: dict