def _addDelayExtension(self, numSrcNeurons, max_delay_for_projection,
max_delay_per_neuron, original_connector,
original_synapse_list, presynaptic_population,
postsynaptic_population, label, synapse_dynamics):
"""
Instantiate new delay extension component, connecting a new edge from
the source vertex to it and new edges from it to the target (given
by numBlocks).
The outgoing edges cover each required block of delays, in groups of
MAX_DELAYS_PER_NEURON delay slots (currently 16).
"""
global controller
# If there are any connections with a delay of less than the maximum,
# create a direct connection between the two populations only containing
# these connections
direct_synaptic_sublist = original_synapse_list.create_delay_sublist(
0, max_delay_per_neuron)
if (direct_synaptic_sublist.get_max_n_connections() != 0):
direct_edge = ProjectionEdge(presynaptic_population.vertex,
postsynaptic_population.vertex,
controller.dao.machineTimeStep,
synapse_list=direct_synaptic_sublist,
label=label)
controller.add_edge(direct_edge)
self.projection_edge = direct_edge
# Create a delay extension vertex to do the extra delays
self.delay_vertex = presynaptic_population.vertex.delay_vertex
if self.delay_vertex is None:
sourceName = presynaptic_population.vertex.label
delayName = "%s_delayed" % (sourceName)
self.delay_vertex = DelayExtension(numSrcNeurons,
max_delay_per_neuron,
label=delayName)
presynaptic_population.vertex.delay_vertex = self.delay_vertex
#controller.add_vertex(self.delay_vertex)
# Create a connection from the source population to the delay vertex
new_label = "%s_to_DE" % (label)
remaining_edge = DelayAfferentEdge(presynaptic_population.vertex,
self.delay_vertex,
label=new_label)
controller.add_edge(remaining_edge)
# Create a list of the connections with delay larger than that which
# can be handled by the neuron itself
remaining_synaptic_sublist = original_synapse_list.create_delay_sublist(
max_delay_per_neuron, max_delay_for_projection)
# Create a special DelayEdge from the delay vertex to the outgoing
# population, with the same set of connections
delay_label = "DE to %s" % (label)
num_blocks = int(
math.ceil(
float(max_delay_for_projection) /
float(max_delay_per_neuron))) - 1
self.delay_edge = DelayProjectionEdge(
self.delay_vertex,
postsynaptic_population.vertex,
controller.dao.machineTimeStep,
num_blocks,
max_delay_per_neuron,
synapse_list=remaining_synaptic_sublist,
synapse_dynamics=synapse_dynamics,
label=delay_label)
controller.add_edge(self.delay_edge)
