class_docstr: Data structure to store different values for spin-up and spin-down electrons.
  
  Attributes
  ----------
  u: any type
      The parameters that corresponds to the spin-up electrons.
  d: any type
      The parameters that corresponds to the spin-down electrons.
  
  References
  ----------
  Kasim, Muhammad F., and Sam M. Vinko. "Learning the exchange-correlation
  functional from nature with fully differentiable density functional
  theory." Physical Review Letters 127.12 (2021): 126403.
  https://github.com/diffqc/dqc/blob/master/dqc/utils/datastruct.py
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docstr: Returns the sum of up and down parameters
docstr_tok: ["Returns","the","sum","of","up","and","down","parameters"]
code: def sum(self):
      """
      Returns the sum of up and down parameters
      """
  
      return self.u + self.d
  
imports: import hashlib
  import xitorch
  from dataclasses import dataclass
  from abc import abstractmethod, abstractproperty
  from typing import Union, List, TypeVar, Generic, Callable
label_desc: Use image node_id 1 for calling the SpinParam obj's underlying member method code with example usage: obj.sum() and returns: unknown