def test_PlotTargets(self):
"""Test plotting targets."""
ldict = {'elements': ['iaf_neuron', 'iaf_psc_alpha'], 'rows': 3,
'columns': 3,
'extent': [2., 2.], 'edge_wrap': True}
cdict = {'connection_type': 'divergent',
'mask': {'grid': {'rows': 2, 'columns': 2}}}
nest.ResetKernel()
l = topo.CreateLayer(ldict)
ian = [gid for gid in nest.GetLeaves(l)[0]
if nest.GetStatus([gid], 'model')[0] == 'iaf_neuron']
ipa = [gid for gid in nest.GetLeaves(l)[0]
if nest.GetStatus([gid], 'model')[0] == 'iaf_psc_alpha']
# connect ian -> all using static_synapse
cdict.update({'sources': {'model': 'iaf_neuron'},
'synapse_model': 'static_synapse'})
topo.ConnectLayers(l, l, cdict)
for k in ['sources', 'synapse_model']:
cdict.pop(k)
# connect ipa -> ipa using stdp_synapse
cdict.update({'sources': {'model': 'iaf_psc_alpha'},
'targets': {'model': 'iaf_psc_alpha'},
'synapse_model': 'stdp_synapse'})
topo.ConnectLayers(l, l, cdict)
for k in ['sources', 'targets', 'synapse_model']:
cdict.pop(k)
ctr = topo.FindCenterElement(l)
fig = topo.PlotTargets(ctr, l)
fig.gca().set_title('Plain call')
self.assertTrue(True)
def test_GetTargetNodesPositions(self):
"""Interface check for finding targets."""
ldict = {'elements': ['iaf_neuron', 'iaf_psc_alpha'], 'rows': 3, 'columns':3,
'extent': [2., 2.], 'edge_wrap': True}
cdict = {'connection_type': 'divergent',
'mask': {'grid': {'rows':2, 'columns':2}}}
nest.ResetKernel()
l = topo.CreateLayer(ldict)
ian = [gid for gid in nest.GetLeaves(l)[0]
if nest.GetStatus([gid], 'model')[0] == 'iaf_neuron']
ipa = [gid for gid in nest.GetLeaves(l)[0]
if nest.GetStatus([gid], 'model')[0] == 'iaf_psc_alpha']
# connect ian -> all using static_synapse
cdict.update({'sources': {'model': 'iaf_neuron'},
'synapse_model': 'static_synapse'})
topo.ConnectLayers(l, l, cdict)
for k in ['sources', 'synapse_model']: cdict.pop(k)
# connect ipa -> ipa using stdp_synapse
cdict.update({'sources': {'model': 'iaf_psc_alpha'},
'targets': {'model': 'iaf_psc_alpha'},
'synapse_model': 'stdp_synapse'})
topo.ConnectLayers(l, l, cdict)
for k in ['sources', 'targets', 'synapse_model']: cdict.pop(k)
t = topo.GetTargetNodes(ian[:1], l)
self.assertEqual(len(t), 1)
p = topo.GetTargetPositions(ian[:1], l)
self.assertEqual(len(p), 1)
self.assertTrue(all([len(pp)==2 for pp in p[0]]))
t = topo.GetTargetNodes(ian, l)
self.assertEqual(len(t), len(ian))
self.assertTrue(all([len(g)==8 for g in t])) # 2x2 mask x 2 neurons / element -> eight targets
p = topo.GetTargetPositions(ian, l)
self.assertEqual(len(p), len(ian))
t = topo.GetTargetNodes(ian, l, tgt_model='iaf_neuron')
self.assertEqual(len(t), len(ian))
self.assertTrue(all([len(g)==4 for g in t])) # 2x2 mask -> four targets
t = topo.GetTargetNodes(ian, l, tgt_model='iaf_psc_alpha')
self.assertEqual(len(t), len(ian))
self.assertTrue(all([len(g)==4 for g in t])) # 2x2 mask -> four targets
t = topo.GetTargetNodes(ipa, l)
self.assertEqual(len(t), len(ipa))
self.assertTrue(all([len(g)==4 for g in t])) # 2x2 mask -> four targets
t = topo.GetTargetNodes(ipa, l, syn_model='static_synapse')
self.assertEqual(len(t), len(ipa))
self.assertTrue(all([len(g)==0 for g in t])) # no static syns
t = topo.GetTargetNodes(ipa, l, syn_model='stdp_synapse')
self.assertEqual(len(t), len(ipa))
self.assertTrue(all([len(g)==4 for g in t])) # 2x2 mask -> four targets
def lgn_to_v1_connections(l_exc, l_inh, sd_exc, sd_inh, l_poiss,
self_orientation):
tp.ConnectLayers(l_poiss, l_exc, dict_poiss_to_v1)
tp.ConnectLayers(l_poiss, l_inh, dict_poiss_to_v1)
leaves_exc = nest.GetLeaves(l_exc, local_only=True)[0]
nest.Connect(leaves_exc, sd_exc)
leaves_inh = nest.GetLeaves(l_inh, local_only=True)[0]
nest.Connect(leaves_inh, sd_inh)
def inspect_network():
model_list, model_dict = models()
layer_list, connect_list = network(model_dict)
# Create neurons and synapses
layer_dic = {}
for name, model, props in layer_list:
my_nest.MyLoadModels(model_dict, [model[1]])
#! Create layer, retrieve neurons ids per elements and p
if model[0] == 'spike_generator':
layer = MyLayerPoissonInput(layer_props=props, sd=False)
else:
layer = MyLayerGroup(layer_props=props,
sd=True,
mm=True,
mm_dt=0.1)
layer_dic[name] = layer
# Connect populations
for conn in connect_list:
my_nest.MyLoadModels(model_dict, [conn[2]['synapse_model']])
name = conn[0] + '_' + conn[1] + '_' + conn[3]
tp.ConnectLayers(layer_dic[conn[0]].layer_id,
layer_dic[conn[1]].layer_id, conn[2])
layer_dic[conn[1]].add_connection(source=layer_dic[conn[0]],
type=conn[3],
props=conn[2])
return layer_dic
def create(self):
from nest import topology as tp
import nest
# Create sublayers
self._layer_call('create')
# Set the GID
self._gid = flatten(self._layer_get('gid'))
# Connect stimulators to parrots, one-to-one
# IMPORTANT: This assumes that all layers are the same size!
radius = self.extent_units(0.1)
one_to_one_connection = {
'sources': {
'model': self.stimulator_model
},
'targets': {
'model': self.PARROT_MODEL
},
'connection_type': 'convergent',
'synapse_model': 'static_synapse',
'mask': {
'circular': {
'radius': radius
}
}
}
tp.ConnectLayers(self._gid, self._gid, one_to_one_connection)
# Get stimulator type
self.stimulator_type = nest.GetDefaults(self.stimulator_model,
'type_id')
def test_DumpConns(self):
"""Test dumping connections."""
ldict = {
'elements': 'iaf_psc_alpha',
'rows': 3,
'columns': 3,
'extent': [2., 2.],
'edge_wrap': True
}
cdict = {
'connection_type': 'divergent',
'mask': {
'circular': {
'radius': 1.
}
}
}
nest.ResetKernel()
l = topo.CreateLayer(ldict)
topo.ConnectLayers(l, l, cdict)
topo.DumpLayerConnections(
l, 'static_synapse',
os.path.join(self.nest_tmpdir(), 'test_DumpConns.out.cnn'))
self.assertTrue(True)
def pn_fig(fig, loc, ldict, cdict,
xlim=[0., .5], ylim=[0, 3.5], xticks=range(0, 51, 5),
yticks=np.arange(0., 1.1, 0.2), clr='blue',
label=''):
nest.ResetKernel()
l = tp.CreateLayer(ldict)
tp.ConnectLayers(l, l, cdict)
ax = fig.add_subplot(loc)
rn = nest.GetLeaves(l)[0]
conns = nest.GetConnections(rn)
cstat = nest.GetStatus(conns)
srcs = [sd['source'] for sd in cstat]
tgts = [sd['target'] for sd in cstat]
dist = np.array(tp.Distance(srcs, tgts))
ax.hist(dist, bins=50, histtype='stepfilled', normed=True)
r = np.arange(0., 0.51, 0.01)
plt.plot(r, 2 * np.pi * r * (1 - 2 * r) * 12 / np.pi, 'r-', lw=3,
zorder=-10)
ax.set_xlim(xlim)
ax.set_ylim(ylim)
"""ax.set_xticks(xticks)
ax.set_yticks(yticks)"""
# ax.set_aspect(100, 'box')
ax.set_xlabel('Source-target distance d')
ax.set_ylabel('Connection probability pconn(d)')
def wd_fig(fig,
loc,
ldict,
cdict,
what,
rpos=None,
xlim=[-1, 51],
ylim=[0, 1],
xticks=range(0, 51, 5),
yticks=np.arange(0., 1.1, 0.2),
clr='blue',
label=''):
nest.ResetKernel()
l = tp.CreateLayer(ldict)
tp.ConnectLayers(l, l, cdict)
ax = fig.add_subplot(loc)
if rpos is None:
rn = nest.GetLeaves(l)[0][:1] # first node
else:
rn = tp.FindNearestElement(l, rpos)
conns = nest.GetConnections(rn)
cstat = nest.GetStatus(conns)
vals = np.array([sd[what] for sd in cstat])
tgts = [sd['target'] for sd in cstat]
locs = np.array(tp.GetPosition(tgts))
ax.plot(locs[:, 0], vals, 'o', mec='none', mfc=clr, label=label)
ax.set_xlim(xlim)
ax.set_ylim(ylim)
ax.set_xticks(xticks)
ax.set_yticks(yticks)
def create_local_circular_connections(layer,
r_loc=0.5,
p_loc=0.7,
allow_autapses=False,
allow_multapses=False):
"""
Create local connections with in a circular radius
:param layer: The layer where the local connections should be established
:param r_loc: radius for local connections
:param p_loc: probability of establishing local connections
:param allow_autapses: Flag to allow self-connections
:param allow_multapses: Flag to allow multiple connections between neurons
"""
# Define mask
mask_dict = {"circular": {"radius": r_loc}}
# Define connection parameters
connection_dict = {
"connection_type": "divergent",
"mask": mask_dict,
"kernel": p_loc,
"allow_autapses": allow_autapses,
"allow_multapses": allow_multapses,
"synapse_model": "static_synapse"
}
tp.ConnectLayers(layer, layer, connection_dict)
def connect(pre, post, syn_type, weight_coef=1, params=None):
"""
Connect outer parts of two 3d layers
Args:
pre: source layer
post: target layer
syn_type: synapse type
weight_coef: weight coefficient for synapses
params: custom connection params
Returns: None
"""
# Create dictionary of connection rules
conn_dict = {
'connection_type': 'divergent',
'weights': float(weight_coef * synapses[syn_type][basic_weight]),
'delays': {
'linear': { # linear is y = ax+c TODO appropriate function
'c': 1.,
'a': .5
}
},
'synapse_model': synapses[syn_type][model]
}
if params is not None:
conn_dict.update(params)
tp.ConnectLayers(pre[k_outer], post[k_outer], conn_dict)
# Show data of new connection
count = len(
nest.GetConnections(source=pre[k_outer_ids], target=post[k_outer_ids]))
g.SYNAPSES += count
log_connection(pre, post, synapses[syn_type][model], conn_dict['weights'],
count)
def free_mask_fig(fig, loc, cdict):
nest.ResetKernel()
l = tp.CreateLayer({'rows': 11, 'columns': 11, 'extent': [11., 11.],
'elements': 'iaf_psc_alpha'})
tp.ConnectLayers(l, l, cdict)
fig.add_subplot(loc)
conn_figure(fig, l, cdict, xticks=range(-5, 6, 2), yticks=range(-5, 6, 2))
def kernel_fig(fig, loc, cdict, showkern=True):
nest.ResetKernel()
l = tp.CreateLayer({'rows': 11, 'columns': 11, 'extent': [11., 11.],
'elements': 'iaf_neuron'})
tp.ConnectLayers(l, l, cdict)
fig.add_subplot(loc)
conn_figure(fig, l, cdict, xticks=range(-5, 6, 2), yticks=range(-5, 6, 2),
showkern=showkern)
def free_mask_3d_fig(fig, loc, cdict):
nest.ResetKernel()
l = tp.CreateLayer(
{'rows': 11, 'columns': 11, 'layers': 11, 'extent': [11., 11., 11.],
'elements': 'iaf_neuron'})
tp.ConnectLayers(l, l, cdict)
fig.add_subplot(loc, projection='3d')
conn_figure_3d(fig, l, cdict, xticks=range(-5, 6, 2),
yticks=range(-5, 6, 2))
def plot_layer_targets(cds, savename):
layer = topo.CreateLayer(layer_dict)
for cd in cds:
topo.ConnectLayers(layer, layer, cd)
ctr = topo.FindCenterElement(layer)
fig = topo.PlotLayer(layer, nodesize=20)
topo.PlotTargets(ctr, layer, fig=fig, tgt_color="red")
plt.savefig("%s.png" % savename)
plt.close()
def plot_layer_targets(cds, savename):
nest.ResetKernel()
layer = topp.CreateLayer({"rows":rowcol, "columns":rowcol,
"extent":extent, "elements":model})
for cd in cds:
topp.ConnectLayers(layer, layer, cd)
ctr = topp.FindCenterElement(layer)
fig = topp.PlotLayer(layer, nodesize=20)
topp.PlotTargets(ctr,layer, fig=fig, tgt_color="red")
pylab.savefig("%s.png"%savename)
pylab.close()
def check_distance():
layer = tp.CreateLayer(l3d_specs)
tp.ConnectLayers(layer, layer, conn_dict1)
nodes = nest.GetChildren(layer)[0]
positions = tp.GetPosition(nodes)
target_positions = tp.GetTargetPositions(nodes, layer)
deltas = filter(
lambda x: x > 0.35,
[[get_delta(positions[i], pos2) for pos2 in target_positions[i]]
for i in range(len(positions))])
print len(deltas)
def kolmogorov_smirnov(self, weight_dict, expected_cdf_func):
"""
Create connections with given distribution of weights and test that it
fits the given expected cumulative distribution using K-S.
"""
# n = rows * cols * Nconn
rows = 10
cols = 10
Nconn = 100
nest.ResetKernel()
# Create layer and connect with given weight distribution
layer = topo.CreateLayer({
'rows': rows,
'columns': cols,
'elements': 'iaf_psc_alpha'
})
topo.ConnectLayers(
layer, layer, {
'connection_type': 'convergent',
'number_of_connections': Nconn,
'weights': weight_dict
})
# Get connection weights and sort
connectome = nest.GetConnections()
weights = numpy.array(nest.GetStatus(connectome, 'weight'))
weights.sort()
n = len(weights)
# The observed (empirical) cdf is simply i/n for weights[i]
observed_cdf = numpy.arange(n + 1, dtype=float) / n
expected_cdf = expected_cdf_func(weights)
D = max(
numpy.abs(expected_cdf - observed_cdf[:-1]).max(),
numpy.abs(expected_cdf - observed_cdf[1:]).max())
# Code to find Kalpha corresponding to level alpha:
# alpha = 0.05
# import scipy.optimize,scipy.stats
# Kalpha = scipy.optimize.fmin(lambda x:
# abs(alpha-scipy.stats.ksprob(x)), 1)[0]
Kalpha = 1.3581054687500012
self.assertTrue(sqrt(n) * D < Kalpha)
def plot_layer_targets(cds, savename):
nest.ResetKernel()
layer = topp.CreateLayer({
'rows': rowcol,
'columns': rowcol,
'extent': extent,
'elements': model
})
for cd in cds:
topp.ConnectLayers(layer, layer, cd)
ctr = topp.FindCenterElement(layer)
fig = topp.PlotLayer(layer, nodesize=20)
topp.PlotTargets(ctr, layer, fig=fig, tgt_color='red')
pylab.savefig('%s.png' % savename)
pylab.close()
def get_Relative_Weight(params, radius):
# Create a fictional network and count the number of target connections
layerProps = {
'rows': params['N'],
'columns': params['N'],
'extent': [params['visSize'], params['visSize']],
'edge_wrap': True,
'elements': 'iaf_cond_exp'
}
l = tp.CreateLayer(layerProps)
dict = {
"connection_type": "convergent",
"mask": {
"circular": {
"radius": radius
}
},
"kernel": 1.0,
"weights": {
"gaussian": {
"p_center": 1.0,
"sigma": radius / 3.0
}
}
}
tp.ConnectLayers(l, l, dict)
ctr = tp.FindCenterElement(l)
targets = tp.GetTargetNodes(ctr, l)
# print ("Number of targets = ",len(targets[0]))
conn = nest.GetConnections(ctr, targets[0])
st = nest.GetStatus(conn)
w = 0.0
for n in np.arange(len(st)):
w += st[n]['weight']
# print ("Total weight = ",w)
return w, len(targets[0])
def plot_connections(layer_dict, conn_dict, file_name):
conn_dict['synapse_model'] = 'static_synapse'
layer = tp.CreateLayer(layer_dict)
tp.ConnectLayers(layer, layer, conn_dict)
fig = tp.PlotLayer(layer)
tp.PlotTargets(tp.FindCenterElement(layer),
layer,
fig=fig,
tgt_color='red')
pylab.savefig(file_name)
#pylab.show()
tp.DumpLayerConnections(layer, conn_dict['synapse_model'],
file_name + ".dump")
positions = tp.GetTargetPositions(layer, layer)
def build_network(self, conn_type):
"""
Build network with randomized weights.
conn_type: 'convergent' or 'divergent'
"""
n_vp = nest.GetKernelStatus()['total_num_virtual_procs']
nest.SetKernelStatus({
'grng_seed':
self.master_seed + n_vp,
'rng_seeds':
range(self.master_seed + n_vp + 1, self.master_seed + 2 * n_vp + 1)
})
layer = topo.CreateLayer({
'rows': 10,
'columns': 10,
'edge_wrap': False,
'elements': 'iaf_psc_delta'
})
topo.ConnectLayers(
layer, layer, {
'connection_type': conn_type,
'mask': {
'circular': {
'radius': 0.5
}
},
'kernel': 1.0,
'weights': {
'uniform': {
'min': 1.0,
'max': 1.5
}
},
'delays': 1.0
})
def create_overlapping_patches(layer,
r_loc=0.5,
p_loc=0.7,
distance=2.5,
num_patches=3,
allow_multapses=False):
"""
Create long-range patchy connections with overlapping patches such that all neurons share almost the same
parameters for these links
:param layer: The layer in which the connections should be established
:param r_loc: Radius of local connections
:param p_loc: Probability of local connections
:param distance: Distance of patches
:param num_patches: Number of patches
:param allow_multapses: Flag to allow multiple links between neurons
:return: Neurons of the layer for debugging (plotting)
"""
# Calculate parameters for pathces
r_p = r_loc / 2.
p_p = get_lr_connection_probability_patches(r_loc, p_loc, r_p)
# Create overlapping patches as every neuron shares the same patch parameter
for n in range(1, num_patches + 1):
angle = n * 360. / float(num_patches)
coordinates = to_coordinates(angle, distance)
mask_dict = {"circular": {"radius": r_p, "anchor": coordinates}}
connection_dict = {
"connection_type": "divergent",
"mask": mask_dict,
"kernel": p_p,
"allow_autapses": False,
"allow_multapses": allow_multapses,
"synapse_model": "static_synapse"
}
tp.ConnectLayers(layer, layer, connection_dict)
# Return nodes of layer for debugging
return nest.GetNodes(layer)[0]
def v1_lateral_connections(l_exc_i, l_exc_j, l_inh_i, l_inh_j, orientation_i,
orientation_j):
if orientation_i == orientation_j:
tp.ConnectLayers(l_exc_i, l_inh_j, short_range_exc_inh)
tp.ConnectLayers(l_exc_i, l_exc_j, short_range_exc_exc)
tp.ConnectLayers(l_inh_i, l_inh_j, short_range_inh_inh)
tp.ConnectLayers(l_inh_i, l_exc_j, short_range_inh_exc)
tp.ConnectLayers(
l_exc_i, l_exc_j,
create_lat_exc('PlosOne_J', kappa_j, orientation_i, orientation_j,
weight_large_range_exc_exc, delay_exc_large,
slowness_exc_large))
tp.ConnectLayers(
l_exc_i, l_inh_j,
create_lat_exc('PlosOne_W', kappa_w, orientation_i, orientation_j,
weight_large_range_exc_inh, delay_exc_large,
slowness_exc_large))
def create_distant_np_connections(layer,
r_loc=0.5,
p_loc=0.7,
allow_multapses=False):
"""
Create long distance connections without any patches
:param layer: Layer in which the connections should be established
:param r_loc: radius for local connections needed to calculate the long range connection probability
:param p_loc: probability for local connections needed to calculate the long range connection probability
:param allow_multapses: allow multiple connections between neurons
:return Neurons of the layer for debugging (plotting)
"""
# Mask for area to which long-range connections can be established
mask_dict = {
"doughnut": {
"inner_radius": r_loc,
"outer_radius": R_MAX / 2.
}
}
# Get possibility to establish a single long-range connection
p_lr = get_lr_connection_probability_np(r_loc, p_loc)
connection_dict = {
"connection_type": "divergent",
"mask": mask_dict,
"kernel": p_lr,
"allow_autapses": False,
"allow_multapses": allow_multapses,
"allow_oversized_mask": True,
}
tp.ConnectLayers(layer, layer, connection_dict)
# Return nodes of layer for debugging
return nest.GetNodes(layer)[0]
def test_get_in_out_degree(self):
self.reset()
layer = create_torus_layer_with_jitter(4, jitter=0, layer_size=2.)
conn_dict = {
"connection_type": "divergent",
"mask": {
"rectangular": {
"lower_left": [-1.0, -1.0],
"upper_right": [1.0, 1.0]
}
},
"kernel": 1.0
}
expect_in = [9, 6, 6, 4]
expect_out = [4, 6, 6, 9]
tp.ConnectLayers(layer, layer, conn_dict)
in_degree, out_degree, _, _, _, _ = tu.get_in_out_degree(
nest.GetNodes(layer)[0])
self.assertListEqual(expect_in, in_degree,
"In degree was not computed correctly")
self.assertListEqual(expect_out, out_degree,
"Out degree was not computed correctly")
#! Corticoreticular
#! ----------------
#! In this case, there is only a single connection, so we write the
#! dictionary itself; it is very similar to the corThalBase, and to
#! show that, we copy first, then update. We need no ``targets`` entry,
#! since Rp has only one neuron per location.
corRet = corThalBase.copy()
corRet.update({"sources": {"model": "L56pyr"}, "weights": 2.5})
#! Build all connections beginning in cortex
#! -----------------------------------------
#! Cortico-cortical, same orientation
print "Connecting: cortico-cortical, same orientation"
[topo.ConnectLayers(Vp_h, Vp_h, conn) for conn in ccConnections]
[topo.ConnectLayers(Vp_v, Vp_v, conn) for conn in ccConnections]
#! Cortico-cortical, cross-orientation
print "Connecting: cortico-cortical, other orientation"
[topo.ConnectLayers(Vp_h, Vp_v, conn) for conn in ccxConnections]
[topo.ConnectLayers(Vp_v, Vp_h, conn) for conn in ccxConnections]
#! Cortico-thalamic connections
print "Connecting: cortico-thalamic"
[topo.ConnectLayers(Vp_h, Tp, conn) for conn in ctConnections]
[topo.ConnectLayers(Vp_v, Tp, conn) for conn in ctConnections]
topo.ConnectLayers(Vp_h, Rp, corRet)
topo.ConnectLayers(Vp_v, Rp, corRet)
#! Thalamo-cortical connections
def setup_network():
print "[ Creating excitatory population ]"
# 1) create excitatory populations
l0_exc_population = tp.CreateLayer({
'rows':
1,
'columns':
num['l0_exc_neurons'],
'extent': [float(num['l0_exc_neurons']), 1.],
'elements':
'iaf_cond_exp',
'edge_wrap':
True
})
print "[ Creating inhibitory population ]"
# 2) create inhibitory population
l0_inh_population = tp.CreateLayer({
'rows':
1,
'columns':
num['l0_inh_neurons'],
'extent': [float(num['l0_inh_neurons']), 1.],
'elements':
'iaf_cond_exp',
'edge_wrap':
True
})
print "[ Projecting excitatory -> inhibitory population ]"
# 3) exc -> inh
CopyModel('static_synapse', 'exc_inh', {'weight': w_exc0_inh0})
l0_exc_inh_dict = {
'connection_type': 'convergent',
'mask': {
'rectangular': {
'lower_left': [-0.5, -0.5],
'upper_right': [0.5, 0.5]
}
},
#'kernel':p_exc0_inh0,
'synapse_model': 'exc_inh'
}
tp.ConnectLayers(l0_exc_population, l0_inh_population, l0_exc_inh_dict)
print "[ Projecting excitatory -> excitatory population ]"
# 4) exc -> exc
# Since these connections are distance-dependent, we can use topological connections here
CopyModel('static_synapse', 'exc_exc', {'weight': w_exc0_exc0_max})
l0_exc_exc_dict = {
'connection_type': 'convergent',
'mask': {
'rectangular': {
'lower_left': [float(num['l0_exc_neurons'] / (-2.0)), -0.5],
'upper_right': [float(num['l0_exc_neurons'] / (2.0)), 0.5]
}
},
'synapse_model': 'exc_exc',
'weights': {
'gaussian': {
'p_center': 1.,
'sigma': sigma_exc0_exc0
}
}
}
#tp.ConnectLayers(l0_exc_population,l0_exc_population,l0_exc_exc_dict)
print "[ Projecting inhibitory -> excitatory population ]"
# 5) inh -> exc
CopyModel('static_synapse', 'inh_exc', {'weight': w_inh0_exc0})
l0_inh_exc_dict = {
'connection_type': 'convergent',
'mask': {
'grid': {
'rows': 1,
'columns': num['l0_inh_neurons'] - 1,
},
'anchor': {
'row': 0,
'column': -1,
}
},
#'kernel':p_inh0_exc0,
'synapse_model': 'inh_exc'
}
tp.ConnectLayers(l0_inh_population, l0_exc_population, l0_inh_exc_dict)
print "[ Creating input population ]"
# 6) create input population
CopyModel('poisson_generator', 'input_model', {'rate': 40.0})
input_population = tp.CreateLayer({
'rows': 1,
'columns': num['inputs'],
'extent': [float(num['inputs']), 1.],
'elements': 'input_model',
'edge_wrap': True
})
parrot_population = tp.CreateLayer({
'rows': 1,
'columns': num['inputs'],
'extent': [float(num['inputs']), 1.],
'elements': 'parrot_neuron',
'edge_wrap': True
})
print "[ Projecting input -> excitatory population ]"
# 7) input -> exc
CopyModel('static_synapse', 'input_parrot', {'weight': 1.0})
CopyModel(
'rect_stdp_synapse', 'parrot_exc', {
'tau_plus': 10.0,
'alpha_minus': alpham_inp_exc0,
'alpha_plus': alphap_inp_exc0,
'Wmax': w_inp_exc0_max
})
#CopyModel('static_synapse','parrot_exc')
CopyModel('static_synapse', 'parrot_inh', {'weight': w_inp_inh0})
input_parrot_dict = {
'connection_type': 'convergent',
'mask': {
'rectangular': {
# this is intended: only connect to one neuron!
'lower_left': [-0.5, -0.5],
'upper_right': [0.5, 0.5]
}
},
'synapse_model': 'input_parrot'
}
parrot_exc_dict = {
'connection_type': 'convergent',
'mask': {
'grid': {
'rows': 1,
'columns': num['inputs'],
},
'anchor': {
'row': 0,
'column': 0,
}
},
#'kernel': {'gaussian': {'p_center':1.0,'sigma':sigma_inp_exc0}},
'weights': {
'uniform': {
'min': w_inp_exc0_min,
'max': w_inp_exc0_peak
}
},
'synapse_model': 'parrot_exc'
}
parrot_inh_dict = copy.copy(parrot_exc_dict)
#parrot_inh_dict['synapse_model'] = 'parrot_inh'
#parrot_inh_dict['kernel'] = {'gaussian': {'p_center':1.0,'sigma':sigma_inp_exc0}}
tp.ConnectLayers(input_population, parrot_population, input_parrot_dict)
tp.ConnectLayers(parrot_population, l0_exc_population, parrot_exc_dict)
#tp.ConnectLayers(parrot_population,l0_inh_population,parrot_inh_dict)
# 7) input -> inh
CopyModel('poisson_generator', 'inh_bias_model', {'rate': 150.0})
inh_bias_population = tp.CreateLayer({
'rows':
1,
'columns':
num['inputs_inh_sources'],
'extent': [float(num['inputs_inh_sources']), 1.],
'elements':
'inh_bias_model',
'edge_wrap':
True
})
CopyModel('static_synapse', 'bias_inh', {'weight': w_inp_inh0})
inh_bias_dict = {
'connection_type': 'convergent',
'mask': {
'rectangular': {
# this is intended: only connect to one neuron!
'lower_left': [-0.5, -0.5],
'upper_right': [0.5, 0.5]
}
},
'synapse_model': 'bias_inh',
'weights': w_inp_inh0,
}
tp.ConnectLayers(inh_bias_population, l0_inh_population, inh_bias_dict)
return l0_exc_population, l0_inh_population, input_population, parrot_population
'connection_type': 'divergent',
'mask': {
'circular': {
'radius': 0.5
}
},
"synapse_model": "static_synapse",
'kernel': {
'gaussian': {
'p_center': 1.0,
'sigma': 0.15
}
}
}
tp.ConnectLayers(lexc, lexc, conndict)
tp.ConnectLayers(linh, lexc, conndict)
nest.DivergentConnect(mm, nest.GetLeaves(lexc)[0])
nest.DivergentConnect(exc, nest.GetLeaves(lexc)[0])
nest.DivergentConnect(inh, nest.GetLeaves(linh)[0])
d = nest.GetStatus(mm)[0]['events']['V_m']
nest.Simulate(100)
events = nest.GetStatus(mm)[0]['events']
t = events['times']
print d, t, events
pl.clf()
pl.subplot(211)
# xext, yext = nest.GetStatus(l1, 'topology')[0]['extent']
# xctr, yctr = nest.GetStatus(l1, 'topology')[0]['center']
# l1_children is a work-around until NEST 3.0 is released
l1_children = nest.hl_api.GetChildren(l1)[0]
# extract position information, transpose to list of x, y and z positions
xpos, ypos, zpos = zip(*topo.GetPosition(l1_children))
fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')
ax.scatter(xpos, ypos, zpos, s=15, facecolor='b', edgecolor='none')
# Gaussian connections in full volume [-0.75,0.75]**3
topo.ConnectLayers(l1, l1,
{'connection_type': 'divergent', 'allow_autapses': False,
'mask': {'volume': {'lower_left': [-0.75, -0.75, -0.75],
'upper_right': [0.75, 0.75, 0.75]}},
'kernel': {'gaussian': {'p_center': 1., 'sigma': 0.25}}})
# show connections from center element
# sender shown in red, targets in green
ctr = topo.FindCenterElement(l1)
xtgt, ytgt, ztgt = zip(*topo.GetTargetPositions(ctr, l1)[0])
xctr, yctr, zctr = topo.GetPosition(ctr)[0]
ax.scatter([xctr], [yctr], [zctr], s=40, facecolor='r', edgecolor='none')
ax.scatter(xtgt, ytgt, ztgt, s=40, facecolor='g', edgecolor='g')
tgts = topo.GetTargetNodes(ctr, l1)[0]
d = topo.Distance(ctr, tgts)
plt.figure()
l = tp.CreateLayer({
'rows': 11,
'columns': 11,
'extent': [11., 11.],
'elements': 'iaf_neuron'
})
conndict = {
'connection_type': 'divergent',
'mask': {
'rectangular': {
'lower_left': [-2., -1.],
'upper_right': [2., 1.]
}
}
}
tp.ConnectLayers(l, l, conndict)
# { end #}
fig = plt.figure()
fig.add_subplot(121)
conn_figure(fig,
l,
conndict,
targets=((tp.FindCenterElement(l), 'red'),
(tp.FindNearestElement(l, [4., 5.]), 'yellow')))
# same another time, with periodic bcs
lpbc = tp.CreateLayer({
'rows': 11,
'columns': 11,
'extent': [11., 11.],