code: def __init_subclass__(cls, backend_name, **kwargs):
      """When a subclass is created, register it in _known_backends"""
      super().__init_subclass__(**kwargs)
  
      if backend_name != "":
          cls._available_tenalg_backends[backend_name.lower()] = cls
          cls.backend_name = backend_name
      else:
          warnings.warn(
              f"Creating a subclass of BaseBackend ({cls.__name__}) with no name."
          )
  
imports: import warnings
label_desc: Use image node_id 1 for calling the TenalgBackend obj's underlying member method code with example usage: obj.__init_subclass__(cls, backend_name) without return types