def save_config(self, config):
        """
        Log an experiment configuration.

        Call this once at the top of your experiment, passing in all important
        config vars as a dict. This will serialize the config to JSON, while
        handling anything which can't be serialized in a graceful way (writing
        as informative a string as possible). 

        Example use:

        .. code-block:: python

            logger = EpochLogger(**logger_kwargs)
            logger.save_config(locals())
        """
        config_json = convert_json(config)
        if self.exp_name is not None:
            config_json['exp_name'] = self.exp_name
        if proc_id()==0:
            output = json.dumps(config_json, separators=(',',':\t'), indent=4, sort_keys=True)
            print(colorize('Saving config:\n', color='cyan', bold=True))
            print(output)
            with open(osp.join(self.output_dir, "config.json"), 'w') as out:
                out.write(output)

        Log an experiment configuration.

        Call this once at the top of your experiment, passing in all important
        config vars as a dict. This will serialize the config to JSON, while
        handling anything which can't be serialized in a graceful way (writing
        as informative a string as possible). 

        Example use:

        .. code-block:: python

            logger = EpochLogger(**logger_kwargs)
            logger.save_config(locals())
        
spinup/utils/logx.py