GPy/GPy/testing/misc_tests.py

from __future__ import print_function
import numpy as np
import scipy as sp
import GPy
import warnings

class MiscTests(np.testing.TestCase):
    """
    Testing some utilities of misc
    """
    def setUp(self):
        self._lim_val = np.finfo(np.float64).max
        self._lim_val_exp = np.log(self._lim_val)

    def test_safe_exp_upper(self):
        with warnings.catch_warnings(record=True) as w:
            warnings.simplefilter('always')  # always print
            assert np.isfinite(np.exp(self._lim_val_exp))
            assert np.isinf(np.exp(self._lim_val_exp + 1))
            assert np.isfinite(GPy.util.misc.safe_exp(self._lim_val_exp + 1))

            print(w)
            print(len(w))
            assert len(w)==1 # should have one overflow warning

    def test_safe_exp_lower(self):
        assert GPy.util.misc.safe_exp(1e-10) < np.inf