Read csv paths to list of dataframes.

def _parse_prior(self):
        """Read csv paths to list of dataframes."""
        paths = self.prior_
        if isinstance(paths, str):
            paths = [paths]
        chain_data = []
        for path in paths:
            parsed_output = _read_output(path)
            for sample, sample_stats, config, adaptation, timing in parsed_output:
                chain_data.append(
                    {
                        "sample": sample,
                        "sample_stats": sample_stats,
                        "configuration_info": config,
                        "adaptation_info": adaptation,
                        "timing_info": timing,
                    }
                )
        self.prior = [item["sample"] for item in chain_data]
        self.sample_stats_prior = [item["sample_stats"] for item in chain_data]