code: def __init__(self, ratio=0.7):
      super(RelevantHolesNumber).__init__()
      self.ratio_ = ratio
  
imports: from abc import ABC
  import numpy
  import pandas
  from gtda.diagrams import Scaler, Filtering, PersistenceEntropy, PersistenceLandscape, BettiCurve
  from gtda.homology import VietorisRipsPersistence
label_desc: Use image node_id 1 to create a new RelevantHolesNumber object from inherited base classes: PersistenceDiagramFeatureExtractor with example: obj = RelevantHolesNumber(ratio)