def test_background_3_node(before_state, purview, alpha, background_3_node):
"""Looking at transition (AB = 11) -> (AC = 11)"""
after_state = (1, 1, 1)
transition = actual.Transition(background_3_node, before_state,
after_state, (0, 1), (0, 2))
causal_link = transition.find_causal_link(Direction.EFFECT, (0, 1))
assert causal_link.purview == purview
assert causal_link.alpha == alpha
def test_background_noised():
tpm = np.array([[0, 0], [1, 1], [1, 1], [1, 1]])
network = Network(tpm)
state = (1, 1)
transition = actual.Transition(network,
state,
state, (0, ), (1, ),
noise_background=True)
assert transition._ratio(Direction.EFFECT, (0, ), (1, )) == 0.415037
assert transition._ratio(Direction.CAUSE, (1, ), (0, )) == 0.415037
# Elements outside the transition are also frozen
transition = actual.Transition(network,
state,
state, (0, ), (0, ),
noise_background=True)
assert np.array_equal(transition.cause_system.tpm, network.tpm)
assert np.array_equal(transition.effect_system.tpm, network.tpm)
def background_all_on():
"""Two OR gates, both ON.
If we look at the transition A -> B, then B should be frozen at t-1, and
A should have no effect on B.
"""
tpm = np.array([[0, 0], [1, 1], [1, 1], [1, 1]])
network = Network(tpm)
state = (1, 1)
return actual.Transition(network, state, state, (0, ), (1, ))
def transition():
"""An OR gate with two inputs. The OR gate is ON, others are OFF."""
tpm = np.array([[0, 0.5, 0.5], [0, 0.5, 0.5], [1, 0.5, 0.5], [1, 0.5, 0.5],
[1, 0.5, 0.5], [1, 0.5, 0.5], [1, 0.5, 0.5], [1, 0.5,
0.5]])
cm = np.array([[0, 0, 0], [1, 0, 0], [1, 0, 0]])
network = Network(tpm, cm)
before_state = (0, 1, 1)
after_state = (1, 0, 0)
return actual.Transition(network, before_state, after_state, (1, 2), (0, ))
def test_potential_purviews(background_3_node):
"""Purviews must be a subset of the corresponding cause/effect system."""
transition = actual.Transition(background_3_node, (1, 1, 1), (1, 1, 1),
(0, 1), (0, 2))
assert transition.potential_purviews(Direction.CAUSE, (0, 2)) == [(0, ),
(1, ),
(0, 1)]
assert transition.potential_purviews(Direction.EFFECT, (0, 1)) == [(0, ),
(2, ),
(0, 2)]
def background_all_off():
"""Two OR gates, both OFF."""
# fmt: off
tpm = np.array([
[0, 0],
[1, 1],
[1, 1],
[1, 1],
])
# fmt: on
network = Network(tpm)
state = (0, 0)
return actual.Transition(network, state, state, (0,), (1,))
def empty_transition(transition):
return actual.Transition(transition.network, transition.before_state,
transition.after_state, (), ())
