code: def from_dict(cls, d):
          
          try:
              # Strip the label to recover initial string (see trick used in as_dict to handle $ chars)
              labels_dict = {k.strip(): v for k, v in d['labels_dict'].items()}
              projections = {}
              structure = None
              if d.get('projections'):
                  if isinstance(d["projections"]['1'][0][0], dict):
                      raise ValueError("Old band structure dict format detected!")
                  structure = Structure.from_dict(d['structure'])
                  projections = {Spin(int(spin)): np.array(v)
                                 for spin, v in d["projections"].items()}
  
              return BandStructureSymmLine(
                  d['kpoints'], {Spin(int(k)): d['bands'][k]
                                 for k in d['bands']},
                  Lattice(d['lattice_rec']['matrix']), d['efermi'],
                  labels_dict, structure=structure, projections=projections)
          except:
              warnings.warn("Trying from_dict failed. Now we are trying the old "
                            "format. Please convert your BS dicts to the new "
                            "format. The old format will be retired in pymatgen "
                            "5.0.")
              return BandStructureSymmLine.from_old_dict(d)
docs: Args:
              d (dict): A dict with all data for a band structure symm line
                  object.
  
          Returns:
              A BandStructureSymmLine object