code: def astext(program, unify_free_vars=False):
      """check that program is parsable in text format"""
      text = program.astext()
      if isinstance(program, relay.Expr):
          roundtrip_program = tvm.relay.parse_expr(text)
      else:
          roundtrip_program = tvm.relay.fromtext(text)
  
      tvm.ir.assert_structural_equal(
          roundtrip_program, program, map_free_vars=True
      )
  
imports: from cffi import FFI
  import numpy
  import tvm
  from tvm.contrib import graph_executor
  from tvm.contrib.download import download_testdata
  from tvm.relay.testing.darknet import LAYERTYPE
  from tvm.relay.testing.darknet import __darknetffi__
  from tvm.relay.frontend.darknet import ACTIVATION
  from tvm import relay
label_desc: Use image node_id 3 for calling a global function with example usage: astext(program, unify_free_vars) without return types