code: def calculate_std_dev(X):
      """Calculate the standard deviations of the features in dataset X"""
      std_dev = np.sqrt(calculate_variance(X))
      return std_dev
  
file_path: ML-From-Scratch/mlfromscratch/utils/data_operation.py
imports: from __future__ import division
  import numpy
  import math
  import sys
label_desc: Use image node_id 4 for calling a global function with example usage: calculate_std_dev(X) and returns: std_dev