o }oi@sddlZGdddeZdS)Ncs,eZdZdZiZeZfddZZ S) Singletonzx Implementation of a generic, tread-safe singleton meta-class. Can be used as meta-class, i.e. will create cs`||jvr+|j||jvrtt|j|i||j|<Wdn1s&wY|j|S)z; Returns singleton instance. A thread safe implementation. N)_Singleton__instances_Singleton__locksuperr__call__)clsargskwargs __class__J/home/ubuntu/.local/lib/python3.10/site-packages/nemo/utils/metaclasses.pyrs   zSingleton.__call__) __name__ __module__ __qualname____doc__r threadingLockrr __classcell__r r r r rs r)rtyperr r r r s