code: def shape(self):
      return self.sts[0].shape
  
imports: import unittest
  from typing import List
  from tinygrad.helpers import prod
  from tinygrad.shape.view import View
  from tinygrad.shape.shapetracker import ShapeTracker
  from tinygrad.shape.symbolic import Variable, sym_infer
label_desc: Use image node_id 2 for calling the MultiShapeTracker obj's underlying member method code with example usage: obj.shape() and returns: self