code: def first(self) -> Tuple[int, Any]:
      idx = self.first_idx()
      return idx, self[idx]
  
imports: import numpy
  from typing import Any, Iterator, List, Tuple, Union
  from aim.storage.treeview import TreeView
  from aim.storage.arrayview import ArrayView
label_desc: Use image node_id 19 for calling the TreeArrayView obj's underlying member method code with example usage: obj.first() and returns: idx,  self