code: def load(cls, folder):
          
          popset = PopulationSet.load_hdf(os.path.join(folder,'popset.h5'))
          sigfile = os.path.join(folder,'trsig.pkl')
          with open(sigfile, 'rb') as f:
              trsig = pickle.load(f)
          return cls(trsig, popset, folder=folder)
docs: Loads PopulationSet from folder
  
          ``popset.h5`` and ``trsig.pkl`` must exist in folder.
  
          :param folder:
              Folder from which to load.