code: def load(cls, config: Optional[Config] = None):
          
          if cls._dfk is not None:
              raise RuntimeError('Config has already been loaded')
  
          if config is None:
              cls._dfk = DataFlowKernel(Config())
          else:
              cls._dfk = DataFlowKernel(config)
  
          return cls._dfk
docs: Load a DataFlowKernel.
  
          Args:
              - config (Config) : Configuration to load. This config will be passed to a
                new DataFlowKernel instantiation which will be set as the active DataFlowKernel.
          Returns:
              - DataFlowKernel : The loaded DataFlowKernel object.