code: def concat(
      xs: Union[(Tuple[(None, ...)], List[None])],
      /,
      *,
      axis: int = 0,
      out: Optional[Union[(None, mx.ndarray.NDArray)]] = None,
  ) -> Union[(None, mx.ndarray.NDArray)]:
      raise IvyNotImplementedException()
  
imports: import mxnet
  from numbers import Number
  from typing import Union, Tuple, Optional, List, Sequence
  import ivy
  from ivy.utils.exceptions import IvyNotImplementedException
label_desc: Use image node_id 1 for calling a global function with example usage: concat() without return types