rlkit/samplers/data_collector/path_collector.py [242:261]:
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    def get_diagnostics(self):
        path_lens = [len(path['actions']) for path in self._epoch_paths]
        stats = OrderedDict([
            ('num steps total', self._num_steps_total),
            ('num paths total', self._num_paths_total),
        ])
        stats.update(create_stats_ordered_dict(
            "path length",
            path_lens,
            always_show_all_stats=True,
        ))
        return stats

    def get_snapshot(self):
        return dict(
            env=self._env,
            policy=self._policy,
            observation_key=self._observation_key,
            desired_goal_key=self._desired_goal_key,
        )
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rlkit/samplers/data_collector/step_collector.py [156:175]:
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    def get_diagnostics(self):
        path_lens = [len(path['actions']) for path in self._epoch_paths]
        stats = OrderedDict([
            ('num steps total', self._num_steps_total),
            ('num paths total', self._num_paths_total),
        ])
        stats.update(create_stats_ordered_dict(
            "path length",
            path_lens,
            always_show_all_stats=True,
        ))
        return stats

    def get_snapshot(self):
        return dict(
            env=self._env,
            policy=self._policy,
            observation_key=self._observation_key,
            desired_goal_key=self._desired_goal_key,
        )
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