code: def get_arrays_from_file(params_file, params=None):
          
          try:
              f = h5py.File(params_file, 'r')
          except:
              raise ValueError('File not found.')
          if params is not None:
              if not isinstance(params, list):
                  params = [params]
              for p in params:
                  if p not in f.keys():
                      raise ValueError('Parameter {} is not in {}'
                                       .format(p, params_file))
          else:
              params = [str(k) for k in f.keys()]
          params_values = {p:f[p][:] for p in params}
          try:
              bandwidth = f.attrs["bandwidth"]
          except KeyError:
              bandwidth = "scott"
  
          f.close()
          return params_values, bandwidth
docs: Reads the values of one or more parameters from an hdf file and
          returns as a dictionary.
  
          Parameters
          ----------
          params_file : str
              The hdf file that contains the values of the parameters.
          params : {None, list}
              If provided, will just retrieve the given parameter names.
  
          Returns
          -------
          dict
              A dictionary of the parameters mapping `param_name -> array`.