code: def instance(*args: Any, **kwargs: Any) -> "SourcesRegistry":
      return Singleton.instance(SourcesRegistry, *args, **kwargs)
  
file_path: hydra/hydra/_internal/sources_registry.py
imports: from typing import Any, Dict, Type
  from hydra.core.singleton import Singleton
  from hydra.plugins.config_source import ConfigSource
label_desc: Use image node_id 4 for calling the SourcesRegistry obj's underlying member method code with example usage: obj.instance() and returns: Singleton