def make_vertices(self, model, n_steps):
"""Create the vertices to be simulated on the machine."""
# Create the system region
self.system_region = SystemRegion(model.machine_timestep,
self.period is not None, n_steps)
# Get all the outgoing signals to determine how big the size out is and
# to build a list of keys.
sigs_conns = model.get_signals_from_object(self)
if len(sigs_conns) == 0:
return netlistspec([])
keys = list()
self.transmission_parameters = list()
for sig, transmission_params in sigs_conns[OutputPort.standard]:
# Add the keys for this connection
transform, sig_keys = get_transform_keys(sig, transmission_params)
keys.extend(sig_keys)
self.transmission_parameters.append((transmission_params,
transform))
size_out = len(keys)
# Build the keys region
self.keys_region = regions.KeyspacesRegion(
keys, [regions.KeyField({"cluster": "cluster"})],
partitioned_by_atom=True
)
# Create the output region
self.output_region = regions.MatrixRegion(
np.zeros((n_steps, size_out)),
sliced_dimension=regions.MatrixPartitioning.columns
)
self.regions = [self.system_region, self.keys_region,
self.output_region]
# Partition by output dimension to create vertices
transmit_constraint = partition.Constraint(10)
sdram_constraint = partition.Constraint(8*2**20) # Max 8MiB
constraints = {
transmit_constraint: lambda s: s.stop - s.start,
sdram_constraint: (
lambda s: regions.utils.sizeof_regions(self.regions, s)),
}
for sl in partition.partition(slice(0, size_out), constraints):
# Determine the resources
resources = {
Cores: 1,
SDRAM: regions.utils.sizeof_regions(self.regions, sl),
}
vsl = VertexSlice(sl, self._label, get_application("value_source"),
resources)
self.vertices.append(vsl)
# Return the vertices and callback methods
return netlistspec(self.vertices, self.load_to_machine,
self.before_simulation)
def test_constraint():
"""Test creating a constraint."""
# Constraints consist of: a limit, and an optional target.
constraint = pac.Constraint(100)
assert constraint.maximum == 100
assert constraint.target == 1.0
assert constraint.max_usage == 100.0
constraint = pac.Constraint(100, 0.9)
assert constraint.maximum == 100
assert constraint.target == 0.9
assert constraint.max_usage == 90.0
def test_single_partition_step(self):
# Create the constraint
constraint_a = pac.Constraint(100, .7)
constraint_b = pac.Constraint(50)
# Create the constraint -> usage mapping
constraints = {
constraint_a: lambda sl: sl.stop - sl.start + 10,
constraint_b: lambda sl: sl.stop - sl.start
}
# Perform the partitioning
assert list(pac.partition(
slice(100), constraints)) == [slice(0, 50),
slice(50, 100)]
def test_unpartitionable(self):
# Create the constraint
constraint_a = pac.Constraint(50)
# Create the constraint -> usage mapping
constraints = {constraint_a: lambda sl: sl.stop - sl.start + 100}
# Perform the partitioning
with pytest.raises(pac.UnpartitionableError):
list(pac.partition(slice(100), constraints))
def test_no_partitioning(self):
# Create the constraint
constraint = pac.Constraint(100, 0.9)
# Create the constraint -> usage mapping
constraints = {constraint: lambda sl: sl.stop - sl.start + 10}
# Perform the partitioning
assert list(pac.partition(slice(0, 80), constraints)) == [slice(0, 80)]
assert list(pac.partition(slice(80), constraints)) == [slice(0, 80)]
def test_just_partitionable(self):
# Create the constraint
constraint_a = pac.Constraint(50)
# Create the constraint -> usage mapping
constraints = {constraint_a: lambda sl: sl.stop - sl.start + 49}
# Perform the partitioning
assert (list(pac.partition(slice(100), constraints)) == [
slice(n, n + 1) for n in range(100)
]) # pragma : no cover
def test_unpartitionable(self):
# Create the constraint
constraint = pac.Constraint(50)
# Create the constraint -> usage mapping
def cons(*slices):
return sum(sl.stop - sl.start for sl in slices) + 50
constraints = {constraint: cons}
# Perform the partitioning
with pytest.raises(pac.UnpartitionableError):
list(pac.partition_multiple((slice(10), slice(2)), constraints))
def test_single_partition_step(self):
# Create the constraint
constraint = pac.Constraint(50)
# Create the constraint -> usage mapping
def cons(*slices):
return sum(sl.stop - sl.start for sl in slices)
constraints = {constraint: cons}
# Perform the partitioning
assert (list(
pac.partition_multiple(
(slice(80), slice(20)),
constraints)) == [(slice(0, 40), slice(0, 10)),
(slice(40, 80), slice(10, 20))])
def test_no_partitioning(self):
# Create the constraint
constraint = pac.Constraint(100, 0.9)
# Create the constraint -> usage mapping
def cons(*slices):
return sum(sl.stop - sl.start for sl in slices) + 10
constraints = {constraint: cons}
# Perform the partitioning
assert (list(
pac.partition_multiple(
(slice(0, 40), slice(0, 30)), constraints)) == list(
pac.partition_multiple(
(slice(40), slice(30)), constraints)) == [(slice(
0, 40), slice(0, 30))])
def make_vertices(self, model, n_steps):
"""Construct the data which can be loaded into the memory of a
SpiNNaker machine.
"""
# Build encoders, gain and bias regions
params = model.params[self.ensemble]
ens_regions = dict()
# Convert the encoders combined with the gain to S1615 before creating
# the region.
encoders_with_gain = params.scaled_encoders
ens_regions[EnsembleRegions.encoders] = regions.MatrixRegion(
tp.np_to_fix(encoders_with_gain),
sliced_dimension=regions.MatrixPartitioning.rows)
# Combine the direct input with the bias before converting to S1615 and
# creating the region.
bias_with_di = params.bias + np.dot(encoders_with_gain,
self.direct_input)
assert bias_with_di.ndim == 1
ens_regions[EnsembleRegions.bias] = regions.MatrixRegion(
tp.np_to_fix(bias_with_di),
sliced_dimension=regions.MatrixPartitioning.rows)
# Convert the gains to S1615 before creating the region
ens_regions[EnsembleRegions.gain] = regions.MatrixRegion(
tp.np_to_fix(params.gain),
sliced_dimension=regions.MatrixPartitioning.rows)
# Extract all the filters from the incoming connections
incoming = model.get_signals_to_object(self)
(ens_regions[EnsembleRegions.input_filters],
ens_regions[EnsembleRegions.input_routing]) = make_filter_regions(
incoming[InputPort.standard],
model.dt,
True,
model.keyspaces.filter_routing_tag,
width=self.ensemble.size_in)
(ens_regions[EnsembleRegions.inhibition_filters],
ens_regions[EnsembleRegions.inhibition_routing]) = \
make_filter_regions(
incoming[EnsembleInputPort.global_inhibition], model.dt, True,
model.keyspaces.filter_routing_tag, width=1
)
# Extract all the decoders for the outgoing connections and build the
# regions for the decoders and the regions for the output keys.
outgoing = model.get_signals_from_object(self)
if OutputPort.standard in outgoing:
decoders, output_keys = \
get_decoders_and_keys(outgoing[OutputPort.standard], True)
else:
decoders = np.array([])
output_keys = list()
size_out = decoders.shape[0]
ens_regions[EnsembleRegions.decoders] = regions.MatrixRegion(
tp.np_to_fix(decoders / model.dt),
sliced_dimension=regions.MatrixPartitioning.rows)
ens_regions[EnsembleRegions.keys] = regions.KeyspacesRegion(
output_keys,
fields=[regions.KeyField({'cluster': 'cluster'})],
partitioned_by_atom=True)
# The population length region stores information about groups of
# co-operating cores.
ens_regions[EnsembleRegions.population_length] = \
regions.ListRegion("I")
# The ensemble region contains basic information about the ensemble
ens_regions[EnsembleRegions.ensemble] = EnsembleRegion(
model.machine_timestep, self.ensemble.size_in)
# The neuron region contains information specific to the neuron type
ens_regions[EnsembleRegions.neuron] = LIFRegion(
model.dt, self.ensemble.neuron_type.tau_rc,
self.ensemble.neuron_type.tau_ref)
# Manage profiling
n_profiler_samples = 0
self.profiled = getconfig(model.config, self.ensemble, "profile",
False)
if self.profiled:
# Try and get number of samples from config
n_profiler_samples = getconfig(model.config, self.ensemble,
"profile_num_samples")
# If it's not specified, calculate sensible default
if n_profiler_samples is None:
n_profiler_samples = (len(EnsembleSlice.profiler_tag_names) *
n_steps * 2)
# Create profiler region
ens_regions[EnsembleRegions.profiler] = regions.Profiler(
n_profiler_samples)
ens_regions[EnsembleRegions.ensemble].n_profiler_samples = \
n_profiler_samples
# Manage probes
for probe in self.local_probes:
if probe.attr in ("output", "spikes"):
self.record_spikes = True
elif probe.attr == "voltage":
self.record_voltages = True
else:
raise NotImplementedError(
"Cannot probe {} on Ensembles".format(probe.attr))
# Set the flags
ens_regions[EnsembleRegions.ensemble].record_spikes = \
self.record_spikes
ens_regions[EnsembleRegions.ensemble].record_voltages = \
self.record_voltages
# Create the probe recording regions
ens_regions[EnsembleRegions.spikes] = regions.SpikeRecordingRegion(
n_steps if self.record_spikes else 0)
ens_regions[EnsembleRegions.voltages] = regions.VoltageRecordingRegion(
n_steps if self.record_voltages else 0)
# Create constraints against which to partition, initially assume that
# we can devote 16 cores to every problem.
sdram_constraint = partition.Constraint(128 * 2**20,
0.9) # 90% of 128MiB
dtcm_constraint = partition.Constraint(16 * 64 * 2**10,
0.9) # 90% of 16 cores DTCM
# The number of cycles available is 200MHz * the machine timestep; or
# 200 * the machine timestep in microseconds.
cycles = 200 * model.machine_timestep
cpu_constraint = partition.Constraint(cycles * 16,
0.8) # 80% of 16 cores compute
# Form the constraints dictionary
def _make_constraint(f, size_in, size_out, **kwargs):
"""Wrap a usage computation method to work with the partitioner."""
def f_(vertex_slice):
# Calculate the number of neurons
n_neurons = vertex_slice.stop - vertex_slice.start
# Call the original method
return f(size_in, size_out, n_neurons, **kwargs)
return f_
partition_constraints = {
sdram_constraint:
_make_constraint(_lif_sdram_usage, self.ensemble.size_in,
size_out),
dtcm_constraint:
_make_constraint(_lif_dtcm_usage, self.ensemble.size_in, size_out),
cpu_constraint:
_make_constraint(_lif_cpu_usage, self.ensemble.size_in, size_out),
}
# Partition the ensemble to create clusters of co-operating cores
self.clusters = list()
vertices = list()
constraints = list()
for sl in partition.partition(slice(0, self.ensemble.n_neurons),
partition_constraints):
# For each slice we create a cluster of co-operating cores. We
# instantiate the cluster and then ask it to produce vertices which
# will be added to the netlist.
cluster = EnsembleCluster(sl, self.ensemble.size_in, size_out,
ens_regions)
self.clusters.append(cluster)
# Get the vertices for the cluster
cluster_vertices = cluster.make_vertices(cycles)
vertices.extend(cluster_vertices)
# Create a constraint which forces these vertices to be present on
# the same chip
constraints.append(SameChipConstraint(cluster_vertices))
# Return the vertices and callback methods
return netlistspec(vertices,
self.load_to_machine,
after_simulation_function=self.after_simulation,
constraints=constraints)
def make_vertices(self, cycles):
"""Partition the neurons onto multiple cores."""
# Make reduced constraints to partition against, we don't partition
# against SDRAM as we're already sure that there is sufficient SDRAM
# (and if there isn't we can't possibly fit all the vertices on a
# single chip).
dtcm_constraint = partition.Constraint(64 * 2**10, 0.9) # 90% of DTCM
cpu_constraint = partition.Constraint(cycles, 0.8) # 80% of compute
# Get the number of neurons in this cluster
n_neurons = self.neuron_slice.stop - self.neuron_slice.start
# Form the constraints dictionary
def _make_constraint(f, size_in, **kwargs):
"""Wrap a usage computation method to work with the partitioner."""
def f_(neuron_slice, output_slice):
# Calculate the number of neurons
n_neurons = neuron_slice.stop - neuron_slice.start
# Calculate the number of outgoing dimensions
size_out = output_slice.stop - output_slice.start
# Call the original method
return f(size_in, size_out, n_neurons, **kwargs)
return f_
constraints = {
dtcm_constraint:
_make_constraint(_lif_dtcm_usage,
self.size_in,
n_neurons_in_cluster=n_neurons),
cpu_constraint:
_make_constraint(_lif_cpu_usage,
self.size_in,
n_neurons_in_cluster=n_neurons),
}
# Partition the slice of neurons that we have
self.neuron_slices = list()
output_slices = list()
for neurons, outputs in partition.partition_multiple(
(self.neuron_slice, slice(self.size_out)), constraints):
self.neuron_slices.append(neurons)
output_slices.append(outputs)
n_slices = len(self.neuron_slices)
assert n_slices <= 16 # Too many cores in the cluster
# Also partition the input space
input_slices = partition.divide_slice(slice(0, self.size_in), n_slices)
# Zip these together to create the vertices
all_slices = zip(input_slices, output_slices)
for i, (in_slice, out_slice) in enumerate(all_slices):
# Create the vertex
vertex = EnsembleSlice(i, self.neuron_slices, in_slice, out_slice,
self.regions)
# Add to the list of vertices
self.vertices.append(vertex)
# Return all the vertices
return self.vertices