FIX/TEST: Use higher precision serialization for FSLLinearTransform

Author: effigies

nitransforms/io/fsl.py

@@ -20,7 +20,7 @@ class FSLLinearTransform(LinearParameters):
     def __str__(self):
         """Generate a string representation."""
         lines = [
-            " ".join(["%g" % col for col in row])
+            " ".join("%.08f" % col for col in row)
             for row in self.structarr["parameters"]
         ]
         return "\n".join(lines + [""])

nitransforms/tests/test_linear.py

@@ -92,13 +92,11 @@ def test_loadsave(tmp_path, data_path, testdata_path, fmt):
             assert np.allclose(
                 xfm.matrix,
                 nitl.load(fname, fmt=fmt, reference=ref_file).matrix,
-                rtol=1e-2,  # FSL incurs into large errors due to rounding
             )
 
         assert np.allclose(
             xfm.matrix,
             nitl.load(fname, fmt=fmt, reference=ref_file, moving=ref_file).matrix,
-            rtol=1e-2,  # FSL incurs into large errors due to rounding
         )
     else:
         assert xfm == nitl.load(fname, fmt=fmt, reference=ref_file)