code: def test_extract_identity():
      mod = get_conv2d()
      op_freqs = relay.analysis.list_op_freqs(mod)
      assert len(op_freqs) == 1
      assert op_freqs["nn.conv2d"] == 1
  
file_path: tvm/tests/python/relay/test_analysis_extract_operators.py
imports: import pytest
  import tvm
  from tvm import relay
  from tvm.relay.testing.resnet import get_workload
  from tvm.relay.testing import run_opt_pass
label_desc: Use image node_id 3 for calling a global function with example usage: test_extract_identity() without return types