code: def _get_relu_activation_prefix(layer_num):
      if layer_num == 0:
          return "model/activation/Relu;"
      return f"model/activation_{layer_num}/Relu;"
  
imports: import numpy
  from PIL import Image
  import pytest
  import tvm
  import tvm.testing
  from tvm import meta_schedule, relay
  from tvm.testing.aot import AOTTestModel, run_and_check, AOTCompiledTestModel
  from tvm.relay.backend import Executor, Runtime
  from tvm.micro.testing.aot_test_utils import AOT_CORSTONE300_RUNNER
  from tvm.contrib.download import download_testdata
  from test_generalized_conv2d import change_ndarray_layout
label_desc: Use image node_id 4 for calling a global function with example usage: _get_relu_activation_prefix(layer_num) and returns: str, layer_num, str, str