parameters: (self, traces_dict)
docstring: traces_dict is a dictionary mapping filenames of traces to metadata
         about those traces.
docstring_summary: traces_dict is a dictionary mapping filenames of traces to metadata
         about those traces.
docstring_tokens: traces_dict is a dictionary mapping filenames of traces to metadata about those traces .
function: def __init__(self, traces_dict):
      """traces_dict is a dictionary mapping filenames of traces to metadata
         about those traces."""
      self._traces_dict = traces_dict
function_tokens: def __init__ ( self , traces_dict ) : self . _traces_dict = traces_dict