code: def import_state(solver, tol=1e-15):
      r"""Convert an external wavefunction to a state vector.
  
      The sources of wavefunctions that are currently accepted are listed below.
  
          * The PySCF library (the restricted and unrestricted CISD/CCSD
            methods are supported). The `solver` argument is then the associated PySCF CISD/CCSD Solver object.
          * The library Dice implementing the SHCI method. The `solver` argument is then the tuple(list[str], array[float]) of Slater determinants and their coefficients.
          * The library Block2 implementing the DMRG method. The `solver` argument is then the tuple(list[int], array[float]) of Slater determinants and their coefficients.
  
      Args:
          solver: external wavefunction object
          tol (float): the tolerance for discarding Slater determinants based on their coefficients
  
      Raises:
          ValueError: if external object type is not supported
  
      Returns:
          array: normalized state vector of length :math:`2^M`, where :math:`M` is the number of spin orbitals
  
      **Example**
  
      >>> from pyscf import gto, scf, ci
      >>> mol = gto.M(atom=[['H', (0, 0, 0)], ['H', (0,0,0.71)]], basis='sto6g')
      >>> myhf = scf.UHF(mol).run()
      >>> myci = ci.UCISD(myhf).run()
      >>> wf_cisd = qml.qchem.import_state(myci, tol=1e-1)
      >>> print(wf_cisd)
      [ 0.        +0.j  0.        +0.j  0.        +0.j  0.1066467 +0.j
        0.        +0.j  0.        +0.j  0.        +0.j  0.        +0.j
        0.        +0.j  0.        +0.j  0.        +0.j  0.        +0.j
       -0.99429698+0.j  0.        +0.j  0.        +0.j  0.        +0.j]
      """
  
      method = str(solver.__str__)
  
      if "CISD" in method and "UCISD" not in method:
          wf_dict = _rcisd_state(solver, tol=tol)
      elif "UCISD" in method:
          wf_dict = _ucisd_state(solver, tol=tol)
      elif "CCSD" in method and "UCCSD" not in method:
          wf_dict = _rccsd_state(solver, tol=tol)
      elif "UCCSD" in method:
          wf_dict = _uccsd_state(solver, tol=tol)
      elif "tuple" in method and len(solver) == 2:
          if isinstance(solver[0][0], str):
              wf_dict = _shci_state(solver, tol=tol)
          elif isinstance(solver[0][0][0], int):
              wf_dict = _dmrg_state(solver, tol=tol)
          else:
              raise ValueError(
                  "For tuple input, the supported objects are"
                  " tuple(list[str], array[float]) for SHCI calculations with Dice library and "
                  "tuple(list[int], array[float]) for DMRG calculations with the Block2 library."
              )
      else:
          raise ValueError(
              "The supported objects are RCISD, UCISD, RCCSD, and UCCSD for restricted and"
              " unrestricted configuration interaction and coupled cluster calculations, and"
              " tuple(list[str], array[float]) for SHCI calculations with Dice library and "
              "tuple(list[int], array[float]) for DMRG calculations with the Block2 library."
          )
      if "tuple" in method:
          wf = _wfdict_to_statevector(wf_dict, len(solver[0][0]))
      else:
          wf = _wfdict_to_statevector(wf_dict, solver.mol.nao)
  
      return wf
  
imports: import warnings
  from itertools import product
  import numpy
  import pennylane
  from pennylane.operation import Tensor, active_new_opmath
  from pennylane.pauli import pauli_sentence
  from pennylane.wires import Wires
label_desc: Use image node_id 10 for calling a global function with example usage: import_state(solver, tol) and returns: wf