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: Returns the density matrix in atomic orbital. For polarized case, it
  returns a SpinParam of 2 tensors representing the density matrices for
  spin-up and spin-down.
docstr_tok: ["Returns","the","density","matrix","in","atomic","orbital",".","For","polarized","case",",","it","returns","a","SpinParam","of","2","tensors","representing","the","density","matrices","for","spin-up","and","spin-down","."]
code: def aodm(self) -> Union[torch.Tensor, SpinParam[torch.Tensor]]:
      """
      Returns the density matrix in atomic orbital. For polarized case, it
      returns a SpinParam of 2 tensors representing the density matrices for
      spin-up and spin-down.
      """
      # return: (nao, nao)
      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 4 for calling the BaseQCCalc obj's underlying member method code with example usage: obj.aodm() without return types