code: def do_expand(st):
      c = [i for i, s in enumerate(st.shape) if s == 1]
      if len(c) == 0:
          return
      c = random.choice(c)
      expand = tuple(
          random.choice([2, 3, 4]) if i == c else s
          for i, s in enumerate(st.shape)
      )
      if DEBUG >= 1:
          print("st.expand(", expand, ")")
      st.expand(expand)
  
file_path: tinygrad/test/external/fuzz_shapetracker.py
imports: import random
  from tinygrad.helpers import DEBUG, getenv
  from test.unit.test_shapetracker import CheckingShapeTracker
label_desc: Use image node_id 8 for calling a global function with example usage: do_expand(st) without return types