code: def first_value(self) -> Any:
      return self[self.first_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 21 for calling the TreeArrayView obj's underlying member method code with example usage: obj.first_value() and returns: self