How to use the threadpoolctl._ThreadpoolInfo function in threadpoolctl

user_api = [user_api]
            else:
                raise ValueError(
                    "user_api must be either in {} or None. Got "
                    "{} instead.".format(_ALL_USER_APIS, user_api))

            if limits is not None:
                limits = {api: limits for api in user_api}
            prefixes = []
        else:
            if isinstance(limits, list):
                # This should be a list of dicts of modules, for compatibility
                # with the result from threadpool_info.
                limits = {module["prefix"]: module["num_threads"]
                          for module in limits}
            elif isinstance(limits, _ThreadpoolInfo):
                # To set the limits from the modules of a _ThreadpoolInfo
                # object.
                limits = {module.prefix: module.num_threads
                          for module in limits}

            if not isinstance(limits, dict):
                raise TypeError("limits must either be an int, a list or a "
                                "dict. Got {} instead".format(type(limits)))

            # With a dictionary, can set both specific limit for given modules
            # and global limit for user_api. Fetch each separately.
            prefixes = [prefix for prefix in limits if prefix in _ALL_PREFIXES]
            user_api = [api for api in limits if api in _ALL_USER_APIS]

        return limits, user_api, prefixes

def get_modules(self, key, values):
        """Return all modules such that values contains module[key]"""
        if key == "user_api" and values is None:
            values = list(_ALL_USER_APIS)
        if not isinstance(values, list):
            values = [values]
        modules = [module for module in self.modules
                   if getattr(module, key) in values]
        return _ThreadpoolInfo(modules=modules)

def _set_threadpool_limits(self):
        """Change the maximal number of threads in selected thread pools.

        Return a list with all the supported modules that have been found
        matching `self._prefixes` and `self._user_api`.
        """
        if self._limits is None:
            return None

        modules = _ThreadpoolInfo(prefixes=self._prefixes,
                                  user_api=self._user_api)
        for module in modules:
            # self._limits is a dict {key: num_threads} where key is either
            # a prefix or a user_api. If a module matches both, the limit
            # corresponding to the prefix is chosed.
            if module.prefix in self._limits:
                num_threads = self._limits[module.prefix]
            else:
                num_threads = self._limits[module.user_api]

            if num_threads is not None:
                module.set_num_threads(num_threads)
        return modules

def get_original_num_threads(self):
        """Original num_threads from before calling threadpool_limits

        Return a dict `{user_api: num_threads}`.
        """
        if self._original_info is not None:
            original_limits = self._original_info
        else:
            original_limits = _ThreadpoolInfo(user_api=self._user_api)

        num_threads = {}
        warning_apis = []

        for user_api in self._user_api:
            limits = [module.num_threads for module in
                      original_limits.get_modules("user_api", user_api)]
            limits = set(limits)
            n_limits = len(limits)

            if n_limits == 1:
                limit = limits.pop()
            elif n_limits == 0:
                limit = None
            else:
                limit = min(limits)