Warnings generated in testing dipy

dipy_tests_warning.txt

dipy.core.tests.test_geometry.test_sphere_cart((array(0.5), array(0.4999999999999999), array(0.7071067811865476)), array([ 0.5       ,  0.5       ,  0.70710678])) ... ok
/home/travis/build/nipy/dipy/venv/lib/python3.5/site-packages/dipy/core/geometry.py:128: RuntimeWarning: invalid value encountered in double_scalars
  theta = np.arccos(z / r)

---

dipy.io.tests.test_io_gradients.test_read_bvals_bvecs ... ok
Doctest: dipy.reconst.benchmarks.bench_squash.old_squash ... /home/travis/build/nipy/dipy/venv/lib/python3.5/site-packages/dipy/reconst/benchmarks/bench_squash.py:75: FutureWarning: comparison to `None` will result in an elementwise object comparison in the future.
  mask = arr != np.array(None)
ok
Doctest: dipy.reconst.cache.Cache.cache_set ... ok

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Test the recursive response calibration method. ... /home/travis/build/nipy/dipy/venv/lib/python3.5/site-packages/dipy/core/sphere.py:188: UserWarning: Vertices are not on the unit sphere.
  warnings.warn("Vertices are not on the unit sphere.")
ok
dipy.reconst.tests.test_csdeconv.test_response_from_mask ... ok

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dipy.reconst.tests.test_csdeconv.test_response_from_mask ... ok
dipy.reconst.tests.test_csdeconv.test_csdeconv ... /home/travis/build/nipy/dipy/venv/lib/python3.5/site-packages/dipy/reconst/csdeconv.py:827: UserWarning: No voxel with a FA higher than 1 were found. Try a larger roi or a lower threshold.
  warnings.warn(msg, UserWarning)
/home/travis/build/nipy/dipy/venv/lib/python3.5/site-packages/numpy/core/_methods.py:59: RuntimeWarning: Mean of empty slice.
  warnings.warn("Mean of empty slice.", RuntimeWarning)
/home/travis/build/nipy/dipy/venv/lib/python3.5/site-packages/numpy/core/_methods.py:70: RuntimeWarning: invalid value encountered in double_scalars
  ret = ret.dtype.type(ret / rcount)
/home/travis/build/nipy/dipy/venv/lib/python3.5/site-packages/numpy/core/_methods.py:68: RuntimeWarning: invalid value encountered in true_divide
  ret, rcount, out=ret, casting='unsafe', subok=False)
ok
dipy.reconst.tests.test_csdeconv.test_odfdeconv ... /home/travis/build/nipy/dipy/venv/lib/python3.5/site-packages/dipy/reconst/csdeconv.py:314: RuntimeWarning: invalid value encountered in true_divide
  odf_sh /= Z
ok
dipy.reconst.tests.test_csdeconv.test_odf_sh_to_sharp ... ok

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dipy.reconst.tests.test_sfm.test_sfm_background ... /home/travis/build/nipy/dipy/venv/lib/python3.5/site-packages/dipy/reconst/sfm.py:385: RuntimeWarning: divide by zero encountered in true_divide
  flat_S = flat_data[..., ~self.gtab.b0s_mask] / flat_S0[..., None]
/home/travis/build/nipy/dipy/venv/lib/python3.5/site-packages/dipy/reconst/sfm.py:83: RuntimeWarning: divide by zero encountered in true_divide
  to_fit = data_no_b0 / s0[..., None]
ok
dipy.reconst.tests.test_sfm.test_sfm_stick ... ok

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dipy.reconst.tests.test_shore_odf.test_multivox_shore ... /home/travis/build/nipy/dipy/venv/lib/python3.5/site-packages/dipy/core/geometry.py:128: RuntimeWarning: invalid value encountered in true_divide
  theta = np.arccos(z / r)
ok
dipy.reconst.tests.test_vec_val_vect.test_vec_val_vect ... ok

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