docstr: Parameters
  ----------
  ansX
  
  Returns
  -------
  csr_matrix
docstr_tok: ["Parameters","--","--","--","--","--","ansX","Returns","--","--","--","-","csr_matrix"]
code: def _anscombe_transform(self, X):
      """
      Parameters
      ----------
      ansX
  
      Returns
      -------
      csr_matrix
      """
      return 2 * np.sqrt(np.array(X) + 3.0 / 8)
  
imports: import numpy
  from scipy.sparse.linalg import lsqr
label_desc: Use image node_id 3 for calling the OLSUngarStyle obj's underlying member method code with example usage: obj._anscombe_transform(X) and returns: unknown