def METHOD_NAME():
    """
    >>> from pulsar.managers.queued_pbs import PbsQueueManager
    >>> _get_managers_dict()['queued_pbs'] == PbsQueueManager
    True
    >>> from pulsar.managers.queued_drmaa import DrmaaQueueManager
    >>> _get_managers_dict()['queued_drmaa'] == DrmaaQueueManager
    True
    """
    managers = {}
    for manager_module in _load_manager_modules():
        for _, obj in inspect.getmembers(manager_module):
            if inspect.isclass(obj) and hasattr(obj, 'manager_type'):
                managers[obj.manager_type] = obj
    return managers