pytorch/sagemakercv/utils/runner/runner.py [147:191]:
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        logger = logging.getLogger(__name__)
        # TODO: This is doubling up output
        logger.addHandler(logging.StreamHandler(sys.stdout))
        if log_dir and self.rank == 0:
            filename = '{}.log'.format(self.timestamp)
            log_file = os.path.join(log_dir, filename)
            self._add_file_handler(logger, log_file, level=level)
        return logger
    
    def register_hook(self, hook, priority='NORMAL'):
        """
        Register a hook into the hook list.
        Args:
            hook (:obj:`Hook`): The hook to be registered.
            priority (int or str or :obj:`Priority`): Hook priority.
                Lower value means higher priority.
        """
        assert isinstance(hook, Hook)
        if hasattr(hook, 'priority'):
            raise ValueError('"priority" is a reserved attribute for hooks')
        priority = get_priority(priority)
        hook.priority = priority
        # insert the hook to a sorted list
        inserted = False
        for i in range(len(self._hooks) - 1, -1, -1):
            if priority >= self._hooks[i].priority:
                self._hooks.insert(i + 1, hook)
                inserted = True
                break
        if not inserted:
            self._hooks.insert(0, hook)
    
    def build_hook(self, args, hook_type=None):
        if isinstance(args, Hook):
            return args
        elif isinstance(args, dict):
            assert issubclass(hook_type, Hook)
            return hook_type(**args)
        else:
            raise TypeError('"args" must be either a Hook object'
                            ' or dict, not {}'.format(type(args)))

    def call_hook(self, fn_name):
        for hook in self._hooks:
            getattr(hook, fn_name)(self)
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tensorflow/sagemakercv/utils/runner/runner.py [210:254]:
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        logger = logging.getLogger(__name__)
        # TODO: This is doubling up output
        logger.addHandler(logging.StreamHandler(sys.stdout))
        if log_dir and self.rank == 0:
            filename = '{}.log'.format(self.timestamp)
            log_file = os.path.join(log_dir, filename)
            self._add_file_handler(logger, log_file, level=level)
        return logger
    
    def register_hook(self, hook, priority='NORMAL'):
        """
        Register a hook into the hook list.
        Args:
            hook (:obj:`Hook`): The hook to be registered.
            priority (int or str or :obj:`Priority`): Hook priority.
                Lower value means higher priority.
        """
        assert isinstance(hook, Hook)
        if hasattr(hook, 'priority'):
            raise ValueError('"priority" is a reserved attribute for hooks')
        priority = get_priority(priority)
        hook.priority = priority
        # insert the hook to a sorted list
        inserted = False
        for i in range(len(self._hooks) - 1, -1, -1):
            if priority >= self._hooks[i].priority:
                self._hooks.insert(i + 1, hook)
                inserted = True
                break
        if not inserted:
            self._hooks.insert(0, hook)
    
    def build_hook(self, args, hook_type=None):
        if isinstance(args, Hook):
            return args
        elif isinstance(args, dict):
            assert issubclass(hook_type, Hook)
            return hook_type(**args)
        else:
            raise TypeError('"args" must be either a Hook object'
                            ' or dict, not {}'.format(type(args)))

    def call_hook(self, fn_name):
        for hook in self._hooks:
            getattr(hook, fn_name)(self)
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