old_contents: # make functions available at the package level using shadow imports
  # since we mostly have one function per file
  from .FeatureExtraction import FeatureExtraction
  
  # list out things that are available for public use
  __all__ = (
  
      # functions and classes of this package
      'FeatureExtraction',
  )
  
new_contents: # make functions available at the package level using shadow imports
  # since we mostly have one function per file
  from .ComputeFSDs import ComputeFSDs
  from .ComputeGradientFeatures import ComputeGradientFeatures
  from .ComputeIntensityFeatures import ComputeIntensityFeatures
  from .ComputeTextureFeatures import ComputeTextureFeatures
  from .FeatureExtraction import FeatureExtraction
  
  # list out things that are available for public use
  __all__ = (
  
      # functions and classes of this package
      'ComputeFSDs',
      'ComputeGradientFeatures',
      'ComputeIntensityFeatures',
      'ComputeTextureFeatures',
      'FeatureExtraction',
  )
  
subject: Update __init__.py - ComputeFSDs.py, ComputeGradientFeatures.py, ComputeIntensityFeatures.py, ComputeTextureFeatures.py