code: def test_factor_scale(self):
      for p in TEST_NDARRAYS:
          scaler = ScaleIntensityFixedMean(factor=0.1, fixed_mean=False)
          result = scaler(p(self.imt))
          expected = p((self.imt * (1 + 0.1)).astype(np.float32))
          assert_allclose(
              result, p(expected), type_test="tensor", rtol=1e-7, atol=0
          )
  
file_path: MONAI/tests/test_scale_intensity_fixed_mean.py
imports: from __future__ import annotations
  import unittest
  import numpy
  from parameterized import parameterized
  from monai.transforms import ScaleIntensityFixedMean
  from tests.utils import TEST_NDARRAYS, NumpyImageTestCase2D, assert_allclose
label_desc: Use image node_id 1 for calling the TestScaleIntensityFixedMean obj's underlying member method code with example usage: obj.test_factor_scale() without return types