code: def save(self, fpath):
      np.save(fpath, self.C)
  
file_path: hypertools/hypertools/_externals/ppca.py
imports: import os
  import numpy
  from scipy.linalg import orth
label_desc: Use image node_id 6 for calling the PPCA obj's underlying member method code with example usage: obj.save(fpath) without return types