def testCreateSynapse(self):
# empty connections, create segment and a synapse
co = Connections(NUM_CELLS, 0.51)
self.assertEqual(co.numSynapses(), 0)
self.assertEqual(co.numSegments(), 0)
# 1st, create a segment
seg = co.createSegment(NUM_CELLS - 1, 1)
self.assertEqual(co.numSegments(), 1)
#1. create a synapse on that segment
syn1 = co.createSynapse(seg, NUM_CELLS - 1, 0.52)
self.assertEqual(pytest.approx(co.permanenceForSynapse(syn1)), 0.52)
self.assertEqual(co.numSynapses(), 1)
#2. creating a duplicit synapse should not crash!
syn2 = co.createSynapse(seg, NUM_CELLS - 1, 0.52)
self.assertEqual(syn1, syn2,
"creating duplicate synapses should return the same")
self.assertEqual(co.numSynapses(), 1,
"Duplicate synapse, number should not increase")
#3. create a different synapse
syn3 = co.createSynapse(seg, 1, 0.52)
self.assertNotEqual(
syn1, syn3, "creating a different synapse must create a new one")
self.assertEqual(co.numSynapses(), 2,
"New synapse should increase the number")
#4. create existing synapse with a new value -> should update permanence
#4.a lower permanence -> keep max()
syn4 = co.createSynapse(
seg, NUM_CELLS - 1,
0.11) #all the same just permanence is a lower val
self.assertEqual(syn1, syn4, "just updating existing syn")
self.assertEqual(co.numSynapses(), 2,
"Duplicate synapse, number should not increase")
self.assertEqual(pytest.approx(co.permanenceForSynapse(syn1)), 0.52,
"update keeps the larger value")
#4.b higher permanence -> update
syn5 = co.createSynapse(
seg, NUM_CELLS - 1,
0.99) #all the same just permanence is a higher val
self.assertEqual(syn1, syn5, "just updating existing syn")
self.assertEqual(co.numSynapses(), 2,
"Duplicate synapse, number should not increase")
self.assertEqual(pytest.approx(co.permanenceForSynapse(syn1)), 0.99,
"updated to the larger permanence value")
def testDestroySynapse(self):
# empty connections, create segment seg and a synapse syn
co = Connections(NUM_CELLS, 0.51)
seg = co.createSegment(NUM_CELLS - 1, 1)
syn1 = co.createSynapse(seg, NUM_CELLS - 1, 0.52)
# destroy the synapse
co.destroySynapse(syn1)
self.assertEqual(co.numSynapses(), 0)
with pytest.raises(
RuntimeError
): # NTA_CHECK, data for removed synapse must not be accessible!
permRemoved = co.permanenceForSynapse(syn1)
assert permRemoved == perm1
# double remove should be just ignored
co.destroySynapse(syn1)