code: def vars(self) -> Set[Variable]:
      flatten_mask = (
          tuple(x for m in self.mask for x in m)
          if self.mask is not None
          else tuple()
      )
      return functools.reduce(
          operator.or_,
          [
              x.vars()
              for x in self.shape
              + self.strides
              + (self.offset,)
              + flatten_mask
              if isinstance(x, Node)
          ],
          set(),
      )
  
imports: from __future__ import annotations
  import functools, operator, itertools
  from dataclasses import dataclass
  from typing import Tuple, List, Optional, Dict, cast
  from tinygrad.helpers import prod, all_int, argsort
  from tinygrad.shape.symbolic import Node, NumNode, Variable, Set, sint
label_desc: Use image node_id 3 for calling the View obj's underlying member method code with example usage: obj.vars() and returns: functools