def testPathsNotInvalidatedByOtherDestroys(self):
""" Creates segments and synapses, then destroys segments and synapses on
either side of them and verifies that existing Segment and Synapse
instances still point to the same segment / synapse as before.
"""
connections = Connections(1024, [0, 1024, 0, 1024])
segment1 = connections.createSegment(11)
connections.createSegment(12)
segment3 = connections.createSegment(13)
connections.createSegment(14)
segment5 = connections.createSegment(15)
synapse1 = connections.createSynapse(segment3, 201, .85)
synapse2 = connections.createSynapse(segment3, 202, .85)
synapse3 = connections.createSynapse(segment3, 203, .85)
synapse4 = connections.createSynapse(segment3, 204, .85)
synapse5 = connections.createSynapse(segment3, 205, .85)
self.assertEqual(203, synapse3.presynapticCell)
connections.destroySynapse(synapse1)
self.assertEqual(203, synapse3.presynapticCell)
connections.destroySynapse(synapse5)
self.assertEqual(203, synapse3.presynapticCell)
connections.destroySegment(segment1)
self.assertEqual(set([synapse2, synapse3, synapse4]),
connections.synapsesForSegment(segment3))
connections.destroySegment(segment5)
self.assertEqual(set([synapse2, synapse3, synapse4]),
connections.synapsesForSegment(segment3))
self.assertEqual(203, synapse3.presynapticCell)
def testCreateSegmentReuse(self):
connections = Connections(1024, [0, 1024, 0, 1024], 2)
segment1 = connections.createSegment(42)
connections.createSynapse(segment1, 1, .5)
connections.createSynapse(segment1, 2, .5)
# Let some time pass.
connections.startNewIteration()
connections.startNewIteration()
connections.startNewIteration()
# Create a segment with 3 synapse.
segment2 = connections.createSegment(42)
connections.createSynapse(segment2, 1, .5)
connections.createSynapse(segment2, 2, .5)
connections.createSynapse(segment2, 3, .5)
connections.startNewIteration()
# Give the first segment some activity.
connections.recordSegmentActivity(segment1)
# Create a new segment with 1 synapse.
segment3 = connections.createSegment(42)
connections.createSynapse(segment3, 1, .5)
segments = connections.segmentsForCell(42)
self.assertEqual(2, len(segments))
# Verify first segment is still there with the same synapses.
self.assertEqual(
set([1, 2]),
set(synapse.presynapticCell
for synapse in connections.synapsesForSegment(segments[0])))
# Verify second segment has been replaced.
self.assertEqual(
set([1]),
set(synapse.presynapticCell
for synapse in connections.synapsesForSegment(segments[1])))
# Verify the UIDs were properly reused.
self.assertLess(segment1.UID, 2)
self.assertLess(segment3.UID, 2)
self.assertTrue(segment1 is connections.segmentForUID(segment1.UID))
self.assertTrue(segment3 is connections.segmentForUID(segment3.UID))
def testSynapseReuse(self):
""" Creates a synapse over the synapses per segment limit, and verifies
that the lowest permanence synapse is removed to make room for the new
synapse.
"""
connections = Connections(1024, [0, 1024, 0, 1024], 1024, 2)
segment = connections.createSegment(10)
synapse1 = connections.createSynapse(segment, 50, .34)
synapse2 = connections.createSynapse(segment, 51, .48)
synapses = connections.synapsesForSegment(segment)
self.assertEqual(set([synapse1, synapse2]), synapses)
# Add an additional synapse to force it over the limit of num synapses
# per segment.
connections.createSynapse(segment, 52, .52)
# Ensure lower permanence synapse was removed.
self.assertEqual(
set([51, 52]),
set(synapse.presynapticCell
for synapse in connections.synapsesForSegment(segment)))
def testReuseSegmentWithDestroyedSynapses(self):
""" Destroy a segment that has a destroyed synapse and a non-destroyed
synapse. Create a new segment in the same place. Make sure its synapse
count is correct.
"""
connections = Connections(1024, [0, 1024, 0, 1024])
segment = connections.createSegment(11)
synapse1 = connections.createSynapse(segment, 201, .85)
connections.createSynapse(segment, 202, .85)
connections.destroySynapse(synapse1)
self.assertEqual(1, connections.numSynapses(segment))
connections.destroySegment(segment)
reincarnated = connections.createSegment(11)
self.assertEqual(0, connections.numSynapses(reincarnated))
self.assertEqual(0, len(connections.synapsesForSegment(reincarnated)))
def testDestroySynapse(self):
""" Creates a segment, creates a number of synapses on it, destroys a
synapse, and makes sure it got destroyed.
"""
connections = Connections(1024, [0, 1024, 0, 1024])
segment = connections.createSegment(20)
synapse1 = connections.createSynapse(segment, 80, .85)
synapse2 = connections.createSynapse(segment, 81, .85)
synapse3 = connections.createSynapse(segment, 82, .15)
self.assertEqual(3, connections.numSynapses())
connections.destroySynapse(synapse2)
self.assertEqual(2, connections.numSynapses())
self.assertEqual({synapse1, synapse3},
connections.synapsesForSegment(segment))
(numActiveConnected,
numActivePotential) = connections.computeActivity([80, 81, 82], .5)
self.assertEqual(1, numActiveConnected[segment.UID])
self.assertEqual(2, numActivePotential[segment.UID])