code: def _loads(self, data_string, layer=None, source=None):
          
          data_dict = yaml.full_load(data_string)
          self._read_dict(data_dict, layer, source)
docs: Load data from a yaml formatted string.
  
          Parameters
          ----------
          data_string : str
              yaml formatted string. The root element of the document should be
              an associative array
          layer : str
              layer to load data into. If none is supplied the outermost one is used
          source : str
              Source to attribute the values to