class_docstr: generic multivariate Archimedean copula with additional power transforms
  
  Nelson p.144, equ. 4.5.2
  
  experimental, not yet tested and used
class_docstr_tok: ["generic","multivariate","Archimedean","copula","with","additional","power","transforms","Nelson","p.144",",","equ",".","4.5.2","experimental",",","not","yet","tested","and","used"]
code: def __init__(self, transform):
      self.transform = transform
  
imports: import warnings
  import numpy
  from scipy.special import expm1, gamma
label_desc: Use image node_id 1 to create a new _TransfPower object from inherited base classes: Transforms with example: obj = _TransfPower(transform)