TST Fix failing fastica tests (scikit-learn#26528)

sklearn/decomposition/tests/test_fastica.py

@@ -165,8 +165,9 @@ def g_test(x):
  assert sources.shape == (1000, 2)
 
  assert_allclose(sources_fun, sources)
- # the debian 32 bit build with global dtype float32 needs an atol to pass
- atol = 1e-7 if global_dtype == np.float32 else 0
+ # Set atol to account for the different magnitudes of the elements in sources
+ # (from 1e-4 to 1e1).
+ atol = np.max(np.abs(sources)) * (1e-5 if global_dtype == np.float32 else 1e-7)
  assert_allclose(sources, ica.transform(m.T), atol=atol)
 
  assert ica.mixing_.shape == (2, 2)