old_contents: 
  from fastats.maths.activations import relu, softplus
  from fastats.maths.deriv import deriv
  from fastats.maths.erf import erf
  from fastats.maths.logistic import logistic
  from fastats.maths.norm_pdf import norm_pdf
  from fastats.maths.sum_sq_dev import sum_sq_dev
  
  __all__ = [
      'deriv',
      'erf',
      'logistic',
      'norm_pdf',
      'sum_sq_dev',
      'relu',
      'softplus',
  ]
  
new_contents: 
  from fastats.maths.activations import relu, softplus
  from fastats.maths.deriv import deriv
  from fastats.maths.erf import erf
  from fastats.maths.ewma import ewma
  from fastats.maths.logistic import logistic
  from fastats.maths.norm_pdf import norm_pdf
  from fastats.maths.sum_sq_dev import sum_sq_dev
  
  __all__ = [
      'deriv',
      'erf',
      'ewma',
      'logistic',
      'norm_pdf',
      'sum_sq_dev',
      'relu',
      'softplus',
  ]
  
subject: Add to maths init