code: def test_real_cepstrum(num_samps, n):
      cpu_sig = numpy.random.rand(num_samps)
      gpu_sig = cupy.array(cpu_sig)
      gpu_out = cupyx.signal.real_cepstrum(gpu_sig, n)
      cpu_out = real_cepstrum(cpu_sig, n)
      testing.assert_allclose(cpu_out, gpu_out)
  
file_path: cupy/tests/cupyx_tests/signal_tests/acoustics_tests/test_cepstrum.py
imports: import pytest
  import numpy
  import cupy
  from cupy import testing
  import cupyx.signal
label_desc: Use image node_id 6 for calling a global function with example usage: test_real_cepstrum(num_samps, n) without return types