def connect_isotropic(self, conn_type="ee"):
"""
conn_type must be 'ee', 'ei', 'ie' or 'ii'
Connect cells in a distant dependent manner:
p_ij = exp(- d_ij / (2 * w_sigma_x**2))
This will give a 'convergence constrained' connectivity, i.e. each cell will have the same sum of incoming weights
---> could be problematic for outlier cells
"""
if self.pc_id == 0:
print "Connect isotropic %s - %s" % (conn_type[0].capitalize(), conn_type[1].capitalize())
(n_src, n_tgt, src_pop, tgt_pop, tp_src, tp_tgt, tgt_cells, syn_type) = self.resolve_src_tgt(conn_type)
if conn_type == "ee":
w_ = self.params["w_max"]
w_tgt_in = params["w_tgt_in_per_cell_%s" % conn_type]
n_max_conn = n_src * n_tgt - n_tgt
elif conn_type == "ei":
w_ = self.params["w_ei_mean"]
w_tgt_in = params["w_tgt_in_per_cell_%s" % conn_type]
n_max_conn = n_src * n_tgt
elif conn_type == "ie":
w_ = self.params["w_ie_mean"]
w_tgt_in = params["w_tgt_in_per_cell_%s" % conn_type]
n_max_conn = n_src * n_tgt
elif conn_type == "ii":
w_ = self.params["w_ii_mean"]
w_tgt_in = params["w_tgt_in_per_cell_%s" % conn_type]
n_max_conn = n_src * n_tgt - n_tgt
if self.debug_connectivity:
conn_list_fn = self.params["conn_list_%s_fn_base" % conn_type] + "%d.dat" % (self.pc_id)
# conn_file = open(conn_list_fn, 'w')
# output = ''
# output_dist = ''
w_mean = w_tgt_in / (self.params["p_%s" % conn_type] * n_max_conn / n_tgt)
w_sigma = self.params["w_sigma_distribution"] * w_mean
w_dist = RandomDistribution(
"normal", (w_mean, w_sigma), rng=self.rng_conn, constrain="redraw", boundaries=(0, w_mean * 10.0)
)
delay_dist = RandomDistribution(
"normal",
(self.params["standard_delay"], self.params["standard_delay_sigma"]),
rng=self.rng_conn,
constrain="redraw",
boundaries=(self.params["delay_range"][0], self.params["delay_range"][1]),
)
p_max = utils.get_pmax(self.params["p_%s" % conn_type], self.params["w_sigma_isotropic"], conn_type)
connector = DistanceDependentProbabilityConnector(
"%f * exp(-d/(2*%f**2))" % (p_max, params["w_sigma_isotropic"]),
allow_self_connections=False,
weights=w_dist,
delays=delay_dist,
space=self.torus,
) # , n_connections=n_conn_ee)
print "p_max for %s" % conn_type, p_max
if self.params["with_short_term_depression"]:
prj = Projection(src_pop, tgt_pop, connector, target=syn_type, synapse_dynamics=self.short_term_depression)
else:
prj = Projection(src_pop, tgt_pop, connector, target=syn_type) # , synapse_dynamics=self.STD)
self.projections[conn_type].append(prj)
if self.debug_connectivity:
# if self.pc_id == 0:
# print 'DEBUG writing to file:', conn_list_fn
prj.saveConnections(self.params["conn_list_%s_fn_base" % conn_type] + ".dat", gather=True)
def connect_isotropic(self, conn_type='ee'):
"""
conn_type must be 'ee', 'ei', 'ie' or 'ii'
Connect cells in a distant dependent manner:
p_ij = exp(- d_ij / (2 * w_sigma_x**2))
This will give a 'convergence constrained' connectivity, i.e. each cell will have the same sum of incoming weights
---> could be problematic for outlier cells
"""
if self.pc_id == 0:
print 'Connect isotropic %s - %s' % (conn_type[0].capitalize(), conn_type[1].capitalize())
(n_src, n_tgt, src_pop, tgt_pop, tp_src, tp_tgt, tgt_cells, syn_type) = self.resolve_src_tgt(conn_type)
if conn_type == 'ee':
w_= self.params['w_max']
w_tgt_in = params['w_tgt_in_per_cell_%s' % conn_type]
elif conn_type == 'ei':
w_= self.params['w_ie_mean']
w_tgt_in = params['w_tgt_in_per_cell_%s' % conn_type]
elif conn_type == 'ie':
w_= self.params['w_ie_mean']
w_tgt_in = params['w_tgt_in_per_cell_%s' % conn_type]
elif conn_type == 'ii':
w_= self.params['w_ii_mean']
w_tgt_in = params['w_tgt_in_per_cell_%s' % conn_type]
if self.debug_connectivity:
conn_list_fn = self.params['conn_list_%s_fn_base' % conn_type] + '%d.dat' % (self.pc_id)
conn_file = open(conn_list_fn, 'w')
output = ''
p_max = utils.get_pmax(self.params['p_%s' % conn_type])
for tgt in tgt_cells:
w = np.zeros(n_src, dtype='float32')
delays = np.zeros(n_src, dtype='float32')
for src in xrange(n_src):
if (src != tgt):
# d_ij = np.sqrt((tp_src[src, 0] - tp_tgt[tgt, 0])**2 + (tp_src[src, 1] - tp_tgt[tgt, 1])**2)
d_ij = utils.torus_distance2D(tp_src[src, 0], tp_tgt[tgt, 0], tp_src[src, 1], tp_tgt[tgt, 1])
p_ij = p_max * np.exp(-d_ij / (2 * params['w_sigma_x']**2))
if np.random.rand() <= p_ij:
w[src] = w_
delays[src] = d_ij * self.params['delay_scale']
w *= w_tgt_in / w.sum()
srcs = w.nonzero()[0]
for src in srcs:
if w[src] > self.params['w_thresh_connection']:
delay = min(max(delays[src], self.params['delay_range'][0]), self.params['delay_range'][1]) # map the delay into the valid range
connect(src_pop[int(src)], tgt_pop[int(tgt)], w[src], delay=delay, synapse_type=syn_type)
output += '%d\t%d\t%.2e\t%.2e\n' % (src, tgt, w[src], delay)
# connect(src_pop[int(src)], tgt_pop[int(tgt)], w[src], delay=params['standard_delay'], synapse_type=syn_type)
# output += '%d\t%d\t%.2e\t%.2e\n' % (src, tgt, w[src], params['standard_delay'])
if self.debug_connectivity:
if self.pc_id == 0:
print 'DEBUG writing to file:', conn_list_fn
conn_file.write(output)
conn_file.close()
