code: def test_vs_convolve(self, xp, scp, dtype, down, want_len):
      random_state = np.random.RandomState(17)
      size = 10000
  
      x = random_state.randn(size).astype(dtype)
      if dtype in (np.complex64, np.complex128):
          x += 1j * random_state.randn(size)
  
      x = xp.asarray(x)
  
      h = scp.signal.firwin(31, 1.0 / down, window="hamming")
      y = scp.signal.upfirdn(h, x, up=1, down=down)
      return y
  
file_path: cupy/tests/cupyx_tests/scipy_tests/signal_tests/test_upfirdn.py
imports: from itertools import product
  import pytest
  import numpy
  from cupy import testing
  from cupyx.scipy.signal._upfirdn import _output_len
label_desc: Use image node_id 4 for calling the TestUpfirdn obj's underlying member method code with example usage: obj.test_vs_convolve(xp, scp, dtype, down, want_len) and returns: y