class_docstr: Quantum Chemistry calculation. This class is the interface to the users
  regarding parameters that can be calculated after the self-consistent
  iterations (or other processes).
  
  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: Obtain the energy of the system.
docstr_tok: ["Obtain","the","energy","of","the","system","."]
code: def energy(self) -> torch.Tensor:
      """
      Obtain the energy of the system.
      """
      pass
  
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 3 for calling the BaseQCCalc obj's underlying member method code with example usage: obj.energy() without return types