code: def get_serialization_context(self, driver_id):
          
          # This function needs to be proctected by a lock, because it will be
          # called by`register_class_for_serialization`, as well as the import
          # thread, from different threads. Also, this function will recursively
          # call itself, so we use RLock here.
          with self.lock:
              if driver_id not in self.serialization_context_map:
                  _initialize_serialization(driver_id)
              return self.serialization_context_map[driver_id]
docs: Get the SerializationContext of the driver that this worker is processing.
  
          Args:
              driver_id: The ID of the driver that indicates which driver to get
                  the serialization context for.
  
          Returns:
              The serialization context of the given driver.