class_docstr: An abstract base class for a model that implements the
  self-concordant constant
  
  Attributes
  ----------
  dtype : `{'float64', 'float32'}`, default='float64'
      Type of the arrays used. This value is set from model and prox dtypes.
  
  Notes
  -----
  This class should be not used by end-users, it is intended for
  development only.
code: def _sc_constant(self) -> float:
      if not self._fitted:
          raise ValueError(
              "call ``fit`` before using " "``sc_constant``"
          )
      return self._get_sc_constant()
  
imports: from abc import abstractmethod
  from .None import Model
label_desc: Use image node_id 2 for calling the ModelSelfConcordant obj's underlying member method code with example usage: obj._sc_constant() and returns: self