code: def test_long_float32(self, xp, scp):
      # regression: gh-15072.  With 32-bit float and either lfilter
      # or filtfilt, this is numerically unstable
      x = scp.signal.decimate(xp.ones(10_000, dtype=np.float32), 10)
      return x
  
imports: import cupy
  from cupy import testing
  import cupyx.scipy.signal
  import cupyx.scipy.signal.windows
  import numpy
  import pytest
  from math import gcd
label_desc: Use image node_id 11 for calling the TestDecimate obj's underlying member method code with example usage: obj.test_long_float32(xp, scp) and returns: x