def test_truncated_at_zero(self):
"""Test scaling shape parameters implying a truncation at zero."""
expected = [np.array([1.0, 0, -0.5]), np.array([np.inf, np.inf, np.inf])]
shape_parameters = [0, np.inf]
plugin = Plugin(distribution="truncnorm", shape_parameters=shape_parameters)
plugin._rescale_shape_parameters(self.location_parameter, self.scale_parameter)
self.assertArrayAlmostEqual(plugin.shape_parameters, expected)
def test_discrete_shape_parameters(self):
"""Test scaling discrete shape parameters."""
expected = [np.array([-3, -2.666667, -2.5]), np.array([7, 4, 2.5])]
shape_parameters = [-4, 6]
plugin = Plugin(distribution="truncnorm", shape_parameters=shape_parameters)
plugin._rescale_shape_parameters(self.location_parameter, self.scale_parameter)
self.assertArrayAlmostEqual(plugin.shape_parameters, expected)
def test_alternative_distribution(self):
"""Test specifying a distribution other than truncated normal. In
this instance, no rescaling is applied."""
shape_parameters = [0, np.inf]
plugin = Plugin(distribution="norm", shape_parameters=shape_parameters)
plugin._rescale_shape_parameters(self.location_parameter, self.scale_parameter)
self.assertArrayEqual(plugin.shape_parameters, shape_parameters)
def test_no_shape_parameters_exception(self):
"""Test raising an exception when shape parameters are not specified
for the truncated normal distribution."""
plugin = Plugin(distribution="truncnorm")
msg = "For the truncated normal distribution"
with self.assertRaisesRegex(ValueError, msg):
plugin._rescale_shape_parameters(self.location_parameter,
self.scale_parameter)