code: def test_shrink_unbind(self):
      v = Variable("v", 1, 100)
      bv = Variable("v", 1, 100).bind(2)
      t = Tensor.rand(3, 4).shrink(((bv, bv + 1), (0, 4)))
      unbound_st, var_val = t.lazydata.st.unbind()
      assert unbound_st == ShapeTracker(
          (View.create(shape=(1, 4), offset=4 * v),)
      )
      assert var_val == {v: 2}
  
imports: import unittest
  from tinygrad.shape.shapetracker import ShapeTracker, View
  from tinygrad.shape.symbolic import Variable, NumNode
  from tinygrad.tensor import Tensor
label_desc: Use image node_id 3 for calling the TestShapeTrackerUnbind obj's underlying member method code with example usage: obj.test_shrink_unbind() without return types