def main(model='diehl_and_cook_2015', data='mnist', param_string=None):
assert param_string is not None, 'Pass "--param_string" argument on command line or main method.'
f = os.path.join(ROOT_DIR, 'params', data, model,
f'auxiliary_{param_string}.pt')
if not os.path.isfile(f):
print(
'File not found locally. Attempting download from swarm2 cluster.')
download_params.main(model=model, data=data, param_string=param_string)
auxiliary = torch.load(open(f, 'rb'))
if data in ['breakout']:
assignments = auxiliary[0]
assignments = get_square_assignments(assignments=assignments,
n_sqrt=int(
np.sqrt(assignments.numel())))
plot_assignments(assignments=assignments,
classes=['no-op', 'fire', 'right', 'left'])
path = os.path.join(ROOT_DIR, 'plots', data, model, 'assignments')
if not os.path.isdir(path):
os.makedirs(path)
plt.savefig(os.path.join(path, f'{param_string}.png'))
# Get voltage recording.
exc_voltages = exc_voltage_monitor.get("v")
inh_voltages = inh_voltage_monitor.get("v")
# Add to spikes recording.
spike_record[i % update_interval] = spikes["Ae"].get("s").view(
50, n_neurons)
# Optionally plot various simulation information.
if plot:
inpt = inpts["X"].view(time, 784).sum(0).view(28, 28)
input_exc_weights = network.connections[("X", "Ae")].w
square_weights = get_square_weights(
input_exc_weights.view(784, n_neurons), n_sqrt, 28)
square_assignments = get_square_assignments(assignments, n_sqrt)
voltages = {"Ae": exc_voltages, "Ai": inh_voltages}
if i == 0:
inpt_axes, inpt_ims = plot_input(image.sum(1).view(28, 28),
inpt,
label=label)
spike_ims, spike_axes = plot_spikes(
{layer: spikes[layer].get("s")
for layer in spikes})
weights_im = plot_weights(square_weights)
assigns_im = plot_assignments(square_assignments)
perf_ax = plot_performance(accuracy)
voltage_ims, voltage_axes = plot_voltages(voltages)
else:
def main(seed=0,
n_neurons=100,
n_train=60000,
n_test=10000,
c_low=1,
c_high=25,
p_low=0.5,
time=250,
dt=1,
theta_plus=0.05,
theta_decay=1e-7,
intensity=1,
progress_interval=10,
update_interval=250,
plot=False,
train=True,
gpu=False):
assert n_train % update_interval == 0 and n_test % update_interval == 0,\
'No. examples must be divisible by update_interval'
params = [
seed, n_neurons, n_train, c_low, c_high, p_low, time, dt, theta_plus,
theta_decay, intensity, progress_interval, update_interval
]
model_name = '_'.join([str(x) for x in params])
if not train:
test_params = [
seed, n_neurons, n_train, n_test, c_low, c_high, p_low, time, dt,
theta_plus, theta_decay, intensity, progress_interval,
update_interval
]
np.random.seed(seed)
if gpu:
torch.set_default_tensor_type('torch.cuda.FloatTensor')
torch.cuda.manual_seed_all(seed)
else:
torch.manual_seed(seed)
n_examples = n_train if train else n_test
n_sqrt = int(np.ceil(np.sqrt(n_neurons)))
n_classes = 10
# Build network.
if train:
network = Network(dt=dt)
input_layer = Input(n=784, traces=True)
exc_layer = DiehlAndCookNodes(n=n_neurons, traces=True)
w = torch.rand(input_layer.n, exc_layer.n)
input_exc_conn = Connection(input_layer,
exc_layer,
w=w,
update_rule=PostPre,
norm=78.4,
nu=(1e-4, 1e-2),
wmax=1.0)
w = torch.zeros(exc_layer.n, exc_layer.n)
for k1 in range(n_neurons):
for k2 in range(n_neurons):
if k1 != k2:
x1, y1 = k1 // np.sqrt(n_neurons), k1 % np.sqrt(n_neurons)
x2, y2 = k2 // np.sqrt(n_neurons), k2 % np.sqrt(n_neurons)
w[k1, k2] = max(
-c_high,
-c_low * np.sqrt(euclidean([x1, y1], [x2, y2])))
recurrent_conn = Connection(exc_layer, exc_layer, w=w)
network.add_layer(input_layer, name='X')
network.add_layer(exc_layer, name='Y')
network.add_connection(input_exc_conn, source='X', target='Y')
network.add_connection(recurrent_conn, source='Y', target='Y')
else:
network = load_network(os.path.join(params_path, model_name + '.pt'))
network.connections['X', 'Y'].update_rule = NoOp(
connection=network.connections['X', 'Y'],
nu=network.connections['X', 'Y'].nu)
network.layers['Y'].theta_decay = 0
network.layers['Y'].theta_plus = 0
# Load MNIST data.
dataset = MNIST(data_path, download=True)
if train:
images, labels = dataset.get_train()
else:
images, labels = dataset.get_test()
images = images.view(-1, 784)
images *= intensity
# Record spikes during the simulation.
spike_record = torch.zeros(update_interval, int(time / dt), n_neurons)
# Neuron assignments and spike proportions.
if train:
assignments = -torch.ones_like(torch.Tensor(n_neurons))
proportions = torch.zeros_like(torch.Tensor(n_neurons, 10))
rates = torch.zeros_like(torch.Tensor(n_neurons, 10))
ngram_scores = {}
else:
path = os.path.join(params_path,
'_'.join(['auxiliary', model_name]) + '.pt')
assignments, proportions, rates, ngram_scores = torch.load(
open(path, 'rb'))
# Sequence of accuracy estimates.
curves = {'all': [], 'proportion': [], 'ngram': []}
predictions = {scheme: torch.Tensor().long() for scheme in curves.keys()}
if train:
best_accuracy = 0
spikes = {}
for layer in set(network.layers) - {'X'}:
spikes[layer] = Monitor(network.layers[layer],
state_vars=['s'],
time=int(time / dt))
network.add_monitor(spikes[layer], name='%s_spikes' % layer)
# Train the network.
if train:
print('\nBegin training.\n')
else:
print('\nBegin test.\n')
inpt_axes = None
inpt_ims = None
spike_ims = None
spike_axes = None
weights_im = None
assigns_im = None
perf_ax = None
# Calculate linear increase every update interval.
if train:
n_increase = int(p_low * n_examples) / update_interval
increase = (c_high - c_low) / n_increase
increases = 0
inhib = c_low
start = t()
for i in range(n_examples):
if train and i % update_interval == 0 and i > 0 and increases < n_increase:
inhib = inhib + increase
print(f'\nIncreasing inhibition to {inhib}.\n')
w = torch.zeros(n_neurons, n_neurons)
for k1 in range(n_neurons):
for k2 in range(n_neurons):
if k1 != k2:
x1, y1 = k1 // np.sqrt(n_neurons), k1 % np.sqrt(
n_neurons)
x2, y2 = k2 // np.sqrt(n_neurons), k2 % np.sqrt(
n_neurons)
w[k1, k2] = max(
-c_high,
-inhib * np.sqrt(euclidean([x1, y1], [x2, y2])))
network.connections['Y', 'Y'].w = w
increases += 1
if i % progress_interval == 0:
print(f'Progress: {i} / {n_examples} ({t() - start:.4f} seconds)')
start = t()
if i % update_interval == 0 and i > 0:
if i % len(labels) == 0:
current_labels = labels[-update_interval:]
else:
current_labels = labels[i % len(images) - update_interval:i %
len(images)]
# Update and print accuracy evaluations.
curves, preds = update_curves(curves,
current_labels,
n_classes,
spike_record=spike_record,
assignments=assignments,
proportions=proportions,
ngram_scores=ngram_scores,
n=2)
print_results(curves)
for scheme in preds:
predictions[scheme] = torch.cat(
[predictions[scheme], preds[scheme]], -1)
# Save accuracy curves to disk.
to_write = ['train'] + params if train else ['test'] + params
f = '_'.join([str(x) for x in to_write]) + '.pt'
torch.save((curves, update_interval, n_examples),
open(os.path.join(curves_path, f), 'wb'))
if train:
if any([x[-1] > best_accuracy for x in curves.values()]):
print(
'New best accuracy! Saving network parameters to disk.'
)
# Save network to disk.
network.save(os.path.join(params_path, model_name + '.pt'))
path = os.path.join(
params_path,
'_'.join(['auxiliary', model_name]) + '.pt')
torch.save((assignments, proportions, rates, ngram_scores),
open(path, 'wb'))
best_accuracy = max([x[-1] for x in curves.values()])
# Assign labels to excitatory layer neurons.
assignments, proportions, rates = assign_labels(
spike_record, labels[i - update_interval:i], 10, rates)
# Compute ngram scores.
ngram_scores = update_ngram_scores(
spike_record, labels[i - update_interval:i], 10, 2,
ngram_scores)
print()
# Get next input sample.
image = images[i]
sample = poisson(datum=image, time=int(time / dt))
inpts = {'X': sample}
# Run the network on the input.
network.run(inpts=inpts, time=time)
retries = 0
while spikes['Y'].get('s').sum() < 5 and retries < 3:
retries += 1
image *= 2
sample = poisson(datum=image, time=int(time / dt))
inpts = {'X': sample}
network.run(inpts=inpts, time=time)
# Add to spikes recording.
spike_record[i % update_interval] = spikes['Y'].get('s').t()
# Optionally plot various simulation information.
if plot:
inpt = inpts['X'].view(time, 784).sum(0).view(28, 28)
_spikes = {layer: spikes[layer].get('s') for layer in spikes}
input_exc_weights = network.connections['X', 'Y'].w
square_weights = get_square_weights(
input_exc_weights.view(784, n_neurons), n_sqrt, 28)
square_assignments = get_square_assignments(assignments, n_sqrt)
# inpt_axes, inpt_ims = plot_input(images[i].view(28, 28), inpt, label=labels[i], axes=inpt_axes, ims=inpt_ims)
spike_ims, spike_axes = plot_spikes(_spikes,
ims=spike_ims,
axes=spike_axes)
weights_im = plot_weights(square_weights, im=weights_im)
# assigns_im = plot_assignments(square_assignments, im=assigns_im)
# perf_ax = plot_performance(curves, ax=perf_ax)
plt.pause(1e-8)
network.reset_() # Reset state variables.
print(f'Progress: {n_examples} / {n_examples} ({t() - start:.4f} seconds)')
i += 1
if i % len(labels) == 0:
current_labels = labels[-update_interval:]
else:
current_labels = labels[i % len(images) - update_interval:i %
len(images)]
# Update and print accuracy evaluations.
curves, preds = update_curves(curves,
current_labels,
n_classes,
spike_record=spike_record,
assignments=assignments,
proportions=proportions,
ngram_scores=ngram_scores,
n=2)
print_results(curves)
for scheme in preds:
predictions[scheme] = torch.cat([predictions[scheme], preds[scheme]],
-1)
if train:
if any([x[-1] > best_accuracy for x in curves.values()]):
print('New best accuracy! Saving network parameters to disk.')
# Save network to disk.
network.save(os.path.join(params_path, model_name + '.pt'))
path = os.path.join(params_path,
'_'.join(['auxiliary', model_name]) + '.pt')
torch.save((assignments, proportions, rates, ngram_scores),
open(path, 'wb'))
if train:
print('\nTraining complete.\n')
else:
print('\nTest complete.\n')
print('Average accuracies:\n')
for scheme in curves.keys():
print(f'\t%s: %.2f' % (scheme, float(np.mean(curves[scheme]))))
# Save accuracy curves to disk.
to_write = ['train'] + params if train else ['test'] + params
to_write = [str(x) for x in to_write]
f = '_'.join(to_write) + '.pt'
torch.save((curves, update_interval, n_examples),
open(os.path.join(curves_path, f), 'wb'))
results = [
np.mean(curves['all']),
np.mean(curves['proportion']),
np.mean(curves['ngram']),
np.max(curves['all']),
np.max(curves['proportion']),
np.max(curves['ngram'])
]
to_write = params + results if train else test_params + results
to_write = [str(x) for x in to_write]
name = 'train.csv' if train else 'test.csv'
if not os.path.isfile(os.path.join(results_path, name)):
with open(os.path.join(results_path, name), 'w') as f:
if train:
f.write(
'random_seed,n_neurons,n_train,excite,c_low,c_high,p_low,time,timestep,theta_plus,theta_decay,'
'intensity,progress_interval,update_interval,mean_all_activity,mean_proportion_weighting,'
'mean_ngram,max_all_activity,max_proportion_weighting,max_ngram\n'
)
else:
f.write(
'random_seed,n_neurons,n_train,n_test,excite,c_low,c_high,p_low,time,timestep,theta_plus,theta_decay,'
'intensity,progress_interval,update_interval,mean_all_activity,mean_proportion_weighting,'
'mean_ngram,max_all_activity,max_proportion_weighting,max_ngram\n'
)
with open(os.path.join(results_path, name), 'a') as f:
f.write(','.join(to_write) + '\n')
if labels.numel() > n_examples:
labels = labels[:n_examples]
else:
while labels.numel() < n_examples:
if 2 * labels.numel() > n_examples:
labels = torch.cat(
[labels, labels[:n_examples - labels.numel()]])
else:
labels = torch.cat([labels, labels])
# Compute confusion matrices and save them to disk.
confusions = {}
for scheme in predictions:
confusions[scheme] = confusion_matrix(labels, predictions[scheme])
to_write = ['train'] + params if train else ['test'] + test_params
f = '_'.join([str(x) for x in to_write]) + '.pt'
torch.save(confusions, os.path.join(confusion_path, f))
print()
def main(seed=0,
n_neurons=100,
n_train=60000,
n_test=10000,
inhib=250,
time=50,
lr=1e-2,
lr_decay=0.99,
dt=1,
theta_plus=0.05,
theta_decay=1e-7,
progress_interval=10,
update_interval=250,
train=True,
plot=False,
gpu=False):
assert n_train % update_interval == 0 and n_test % update_interval == 0, \
'No. examples must be divisible by update_interval'
params = [
seed, n_neurons, n_train, inhib, time, lr, lr_decay, theta_plus,
theta_decay, progress_interval, update_interval
]
test_params = [
seed, n_neurons, n_train, n_test, inhib, time, lr, lr_decay,
theta_plus, theta_decay, progress_interval, update_interval
]
model_name = '_'.join([str(x) for x in params])
np.random.seed(seed)
if gpu:
torch.set_default_tensor_type('torch.cuda.FloatTensor')
torch.cuda.manual_seed_all(seed)
else:
torch.manual_seed(seed)
if train:
n_examples = n_train
else:
n_examples = n_test
n_sqrt = int(np.ceil(np.sqrt(n_neurons)))
n_classes = 10
# Build network.
if train:
network = Network(dt=dt)
input_layer = Input(n=784, traces=True, trace_tc=5e-2)
network.add_layer(input_layer, name='X')
output_layer = DiehlAndCookNodes(n=n_neurons,
traces=True,
rest=0,
reset=0,
thresh=1,
refrac=0,
decay=1e-2,
trace_tc=5e-2,
theta_plus=theta_plus,
theta_decay=theta_decay)
network.add_layer(output_layer, name='Y')
w = 0.3 * torch.rand(784, n_neurons)
input_connection = Connection(source=network.layers['X'],
target=network.layers['Y'],
w=w,
update_rule=PostPre,
nu=[0, lr],
wmin=0,
wmax=1,
norm=78.4)
network.add_connection(input_connection, source='X', target='Y')
w = -inhib * (torch.ones(n_neurons, n_neurons) -
torch.diag(torch.ones(n_neurons)))
recurrent_connection = Connection(source=network.layers['Y'],
target=network.layers['Y'],
w=w,
wmin=-inhib,
wmax=0)
network.add_connection(recurrent_connection, source='Y', target='Y')
else:
path = os.path.join('..', '..', 'params', data, model)
network = load_network(os.path.join(path, model_name + '.pt'))
network.connections['X', 'Y'].update_rule = NoOp(
connection=network.connections['X', 'Y'],
nu=network.connections['X', 'Y'].nu)
network.layers['Y'].theta_decay = 0
network.layers['Y'].theta_plus = 0
# Load Fashion-MNIST data.
dataset = FashionMNIST(path=os.path.join('..', '..', 'data',
'FashionMNIST'),
download=True)
if train:
images, labels = dataset.get_train()
else:
images, labels = dataset.get_test()
images = images.view(-1, 784)
images = images / 255
# if train:
# for i in range(n_neurons):
# network.connections['X', 'Y'].w[:, i] = images[i] + images[i].mean() * torch.randn(784)
# Record spikes during the simulation.
spike_record = torch.zeros(update_interval, time, n_neurons)
# Neuron assignments and spike proportions.
if train:
assignments = -torch.ones_like(torch.Tensor(n_neurons))
proportions = torch.zeros_like(torch.Tensor(n_neurons, n_classes))
rates = torch.zeros_like(torch.Tensor(n_neurons, n_classes))
ngram_scores = {}
else:
path = os.path.join('..', '..', 'params', data, model)
path = os.path.join(path, '_'.join(['auxiliary', model_name]) + '.pt')
assignments, proportions, rates, ngram_scores = torch.load(
open(path, 'rb'))
# Sequence of accuracy estimates.
curves = {'all': [], 'proportion': [], 'ngram': []}
if train:
best_accuracy = 0
spikes = {}
for layer in set(network.layers):
spikes[layer] = Monitor(network.layers[layer],
state_vars=['s'],
time=time)
network.add_monitor(spikes[layer], name='%s_spikes' % layer)
# Train the network.
if train:
print('\nBegin training.\n')
else:
print('\nBegin test.\n')
inpt_axes = None
inpt_ims = None
spike_ims = None
spike_axes = None
weights_im = None
assigns_im = None
perf_ax = None
start = t()
for i in range(n_examples):
if i % progress_interval == 0 and train:
network.connections['X', 'Y'].update_rule.nu[1] *= lr_decay
if i % progress_interval == 0:
print(f'Progress: {i} / {n_examples} ({t() - start:.4f} seconds)')
start = t()
if i % update_interval == 0 and i > 0:
if i % len(labels) == 0:
current_labels = labels[-update_interval:]
else:
current_labels = labels[i % len(images) - update_interval:i %
len(images)]
# Update and print accuracy evaluations.
curves, predictions = update_curves(curves,
current_labels,
n_classes,
spike_record=spike_record,
assignments=assignments,
proportions=proportions,
ngram_scores=ngram_scores,
n=2)
print_results(curves)
if train:
if any([x[-1] > best_accuracy for x in curves.values()]):
print(
'New best accuracy! Saving network parameters to disk.'
)
# Save network to disk.
path = os.path.join('..', '..', 'params', data, model)
if not os.path.isdir(path):
os.makedirs(path)
network.save(os.path.join(path, model_name + '.pt'))
path = os.path.join(
path, '_'.join(['auxiliary', model_name]) + '.pt')
torch.save((assignments, proportions, rates, ngram_scores),
open(path, 'wb'))
best_accuracy = max([x[-1] for x in curves.values()])
# Assign labels to excitatory layer neurons.
assignments, proportions, rates = assign_labels(
spike_record, current_labels, n_classes, rates)
# Compute ngram scores.
ngram_scores = update_ngram_scores(spike_record,
current_labels, n_classes,
2, ngram_scores)
print()
# Get next input sample.
image = images[i % n_examples]
sample = rank_order(datum=image, time=time, dt=dt)
inpts = {'X': sample}
# Run the network on the input.
network.run(inpts=inpts, time=time)
retries = 0
while spikes['Y'].get('s').sum() < 5 and retries < 3:
retries += 1
image *= 2
sample = rank_order(datum=image, time=time, dt=dt)
inpts = {'X': sample}
network.run(inpts=inpts, time=time)
# Add to spikes recording.
spike_record[i % update_interval] = spikes['Y'].get('s').t()
# Optionally plot various simulation information.
if plot:
_input = images[i % n_examples].view(28, 28)
reconstruction = inpts['X'].view(time, 784).sum(0).view(28, 28)
_spikes = {layer: spikes[layer].get('s') for layer in spikes}
input_exc_weights = network.connections['X', 'Y'].w
square_weights = get_square_weights(
input_exc_weights.view(784, n_neurons), n_sqrt, 28)
square_assignments = get_square_assignments(assignments, n_sqrt)
# inpt_axes, inpt_ims = plot_input(_input, reconstruction, label=labels[i], axes=inpt_axes, ims=inpt_ims)
spike_ims, spike_axes = plot_spikes(_spikes,
ims=spike_ims,
axes=spike_axes)
weights_im = plot_weights(square_weights, im=weights_im, wmax=0.25)
# assigns_im = plot_assignments(square_assignments, im=assigns_im)
# perf_ax = plot_performance(curves, ax=perf_ax)
plt.pause(1e-8)
network.reset_() # Reset state variables.
print(f'Progress: {n_examples} / {n_examples} ({t() - start:.4f} seconds)')
i += 1
if i % len(labels) == 0:
current_labels = labels[-update_interval:]
else:
current_labels = labels[i % len(images) - update_interval:i %
len(images)]
# Update and print accuracy evaluations.
curves, predictions = update_curves(curves,
current_labels,
n_classes,
spike_record=spike_record,
assignments=assignments,
proportions=proportions,
ngram_scores=ngram_scores,
n=2)
print_results(curves)
if train:
if any([x[-1] > best_accuracy for x in curves.values()]):
print('New best accuracy! Saving network parameters to disk.')
# Save network to disk.
if train:
path = os.path.join('..', '..', 'params', data, model)
if not os.path.isdir(path):
os.makedirs(path)
network.save(os.path.join(path, model_name + '.pt'))
path = os.path.join(
path, '_'.join(['auxiliary', model_name]) + '.pt')
torch.save((assignments, proportions, rates, ngram_scores),
open(path, 'wb'))
if train:
print('\nTraining complete.\n')
else:
print('\nTest complete.\n')
print('Average accuracies:\n')
for scheme in curves.keys():
print('\t%s: %.2f' % (scheme, float(np.mean(curves[scheme]))))
# Save accuracy curves to disk.
path = os.path.join('..', '..', 'curves', data, model)
if not os.path.isdir(path):
os.makedirs(path)
if train:
to_write = ['train'] + params
else:
to_write = ['test'] + params
to_write = [str(x) for x in to_write]
f = '_'.join(to_write) + '.pt'
torch.save((curves, update_interval, n_examples),
open(os.path.join(path, f), 'wb'))
# Save results to disk.
path = os.path.join('..', '..', 'results', data, model)
if not os.path.isdir(path):
os.makedirs(path)
results = [
np.mean(curves['all']),
np.mean(curves['proportion']),
np.mean(curves['ngram']),
np.max(curves['all']),
np.max(curves['proportion']),
np.max(curves['ngram'])
]
if train:
to_write = params + results
else:
to_write = test_params + results
to_write = [str(x) for x in to_write]
if train:
name = 'train.csv'
else:
name = 'test.csv'
if not os.path.isfile(os.path.join(path, name)):
with open(os.path.join(path, name), 'w') as f:
if train:
f.write(
'random_seed,n_neurons,n_train,inhib,time,lr,lr_decay,theta_plus,theta_decay,'
'progress_interval,update_interval,mean_all_activity,mean_proportion_weighting,'
'mean_ngram,max_all_activity,max_proportion_weighting,max_ngram\n'
)
else:
f.write(
'random_seed,n_neurons,n_train,n_test,inhib,time,lr,lr_decay,theta_plus,theta_decay,'
'progress_interval,update_interval,mean_all_activity,mean_proportion_weighting,'
'mean_ngram,max_all_activity,max_proportion_weighting,max_ngram\n'
)
with open(os.path.join(path, name), 'a') as f:
f.write(','.join(to_write) + '\n')
# Get voltage recording.
exc_voltages = exc_voltage_monitor.get("v")
inh_voltages = inh_voltage_monitor.get("v")
# Add to spikes recording.
spike_record[i % update_interval] = spikes["Ae"].get("s").view(
time, n_neurons)
# Optionally plot various simulation information.
if plot:
inpt = inputs["X"].view(time, 32 * 32 * 3).sum(0).view(32, 32 * 3)
input_exc_weights = network.connections[("X", "Ae")].w
square_weights = get_square_weights(
input_exc_weights.view(32 * 32 * 3, n_neurons), n_sqrt,
(32, 32 * 3))
square_assignments = get_square_assignments(assignments, n_sqrt)
voltages = {"Ae": exc_voltages, "Ai": inh_voltages}
inpt_axes, inpt_ims = plot_input(image.sum(1).view(32, 32, 3),
inpt,
label=label,
axes=inpt_axes,
ims=inpt_ims)
spike_ims, spike_axes = plot_spikes(
{
layer: spikes[layer].get("s").view(time, 1, -1)
for layer in spikes
},
ims=spike_ims,
axes=spike_axes,
)
def main(seed=0,
n_neurons=100,
n_train=60000,
n_test=10000,
inhib=100,
lr=1e-2,
lr_decay=1,
time=350,
dt=1,
theta_plus=0.05,
tc_theta_decay=1e7,
intensity=1,
progress_interval=10,
update_interval=250,
plot=False,
train=True,
gpu=False):
assert n_train % update_interval == 0 and n_test % update_interval == 0, \
'No. examples must be divisible by update_interval'
params = [
seed, n_neurons, n_train, inhib, lr, lr_decay, time, dt, theta_plus,
tc_theta_decay, intensity, progress_interval, update_interval
]
test_params = [
seed, n_neurons, n_train, n_test, inhib, lr, lr_decay, time, dt,
theta_plus, tc_theta_decay, intensity, progress_interval,
update_interval
]
model_name = '_'.join([str(x) for x in params])
np.random.seed(seed)
if gpu:
torch.set_default_tensor_type('torch.cuda.FloatTensor')
torch.cuda.manual_seed_all(seed)
else:
torch.manual_seed(seed)
n_examples = n_train if train else n_test
n_sqrt = int(np.ceil(np.sqrt(n_neurons)))
n_classes = 10
# Build network.
if train:
network = DiehlAndCook2015v2(n_inpt=784,
n_neurons=n_neurons,
inh=inhib,
dt=dt,
norm=78.4,
theta_plus=theta_plus,
tc_theta_decay=tc_theta_decay,
nu=[0, lr])
else:
network = load(os.path.join(params_path, model_name + '.pt'))
network.connections['X', 'Y'].update_rule = NoOp(
connection=network.connections['X', 'Y'],
nu=network.connections['X', 'Y'].nu)
network.layers['Y'].tc_theta_decay = 0
network.layers['Y'].theta_plus = 0
# Load MNIST data.
dataset = MNIST(path=data_path, download=True)
if train:
images, labels = dataset.get_train()
else:
images, labels = dataset.get_test()
images = images.view(-1, 784)
images *= intensity
# Record spikes during the simulation.
spike_record = torch.zeros(update_interval, time, n_neurons)
full_spike_record = torch.zeros(n_examples, n_neurons).long()
# Neuron assignments and spike proportions.
if train:
assignments = -torch.ones_like(torch.Tensor(n_neurons))
proportions = torch.zeros_like(torch.Tensor(n_neurons, n_classes))
rates = torch.zeros_like(torch.Tensor(n_neurons, n_classes))
ngram_scores = {}
else:
path = os.path.join(params_path,
'_'.join(['auxiliary', model_name]) + '.pt')
assignments, proportions, rates, ngram_scores = torch.load(
open(path, 'rb'))
# Sequence of accuracy estimates.
curves = {'all': [], 'proportion': [], 'ngram': []}
predictions = {scheme: torch.Tensor().long() for scheme in curves.keys()}
if train:
best_accuracy = 0
spikes = {}
for layer in set(network.layers):
spikes[layer] = Monitor(network.layers[layer],
state_vars=['s'],
time=time)
network.add_monitor(spikes[layer], name='%s_spikes' % layer)
# Train the network.
if train:
print('\nBegin training.\n')
else:
print('\nBegin test.\n')
inpt_axes = None
inpt_ims = None
spike_ims = None
spike_axes = None
weights_im = None
assigns_im = None
perf_ax = None
start = t()
for i in range(n_examples):
if i % progress_interval == 0:
print(f'Progress: {i} / {n_examples} ({t() - start:.4f} seconds)')
start = t()
if i % update_interval == 0 and i > 0:
if train:
network.connections['X', 'Y'].update_rule.nu[1] *= lr_decay
if i % len(labels) == 0:
current_labels = labels[-update_interval:]
else:
current_labels = labels[i % len(images) - update_interval:i %
len(images)]
# Update and print accuracy evaluations.
curves, preds = update_curves(curves,
current_labels,
n_classes,
spike_record=spike_record,
assignments=assignments,
proportions=proportions,
ngram_scores=ngram_scores,
n=2)
print_results(curves)
for scheme in preds:
predictions[scheme] = torch.cat(
[predictions[scheme], preds[scheme]], -1)
# Save accuracy curves to disk.
to_write = ['train'] + params if train else ['test'] + params
f = '_'.join([str(x) for x in to_write]) + '.pt'
torch.save((curves, update_interval, n_examples),
open(os.path.join(curves_path, f), 'wb'))
if train:
if any([x[-1] > best_accuracy for x in curves.values()]):
print(
'New best accuracy! Saving network parameters to disk.'
)
# Save network to disk.
network.save(os.path.join(params_path, model_name + '.pt'))
path = os.path.join(
params_path,
'_'.join(['auxiliary', model_name]) + '.pt')
torch.save((assignments, proportions, rates, ngram_scores),
open(path, 'wb'))
best_accuracy = max([x[-1] for x in curves.values()])
# Assign labels to excitatory layer neurons.
assignments, proportions, rates = assign_labels(
spike_record, current_labels, n_classes, rates)
# Compute ngram scores.
ngram_scores = update_ngram_scores(spike_record,
current_labels, n_classes,
2, ngram_scores)
print()
# Get next input sample.
image = images[i % len(images)]
sample = poisson(datum=image, time=time, dt=dt)
inpts = {'X': sample}
# Run the network on the input.
network.run(inpts=inpts, time=time)
retries = 0
while spikes['Y'].get('s').sum() < 1 and retries < 3:
retries += 1
image *= 2
sample = poisson(datum=image, time=time, dt=dt)
inpts = {'X': sample}
network.run(inpts=inpts, time=time)
# Add to spikes recording.
spike_record[i % update_interval] = spikes['Y'].get('s').t()
full_spike_record[i] = spikes['Y'].get('s').t().sum(0).long()
# Optionally plot various simulation information.
if plot:
_input = image.view(28, 28)
reconstruction = inpts['X'].view(time, 784).sum(0).view(28, 28)
_spikes = {layer: spikes[layer].get('s') for layer in spikes}
input_exc_weights = network.connections[('X', 'Y')].w
square_weights = get_square_weights(
input_exc_weights.view(784, n_neurons), n_sqrt, 28)
square_assignments = get_square_assignments(assignments, n_sqrt)
inpt_axes, inpt_ims = plot_input(_input,
reconstruction,
label=labels[i],
axes=inpt_axes,
ims=inpt_ims)
spike_ims, spike_axes = plot_spikes(_spikes,
ims=spike_ims,
axes=spike_axes)
weights_im = plot_weights(square_weights, im=weights_im)
assigns_im = plot_assignments(square_assignments, im=assigns_im)
perf_ax = plot_performance(curves, ax=perf_ax)
plt.pause(1e-8)
network.reset_() # Reset state variables.
print(f'Progress: {n_examples} / {n_examples} ({t() - start:.4f} seconds)')
i += 1
if i % len(labels) == 0:
current_labels = labels[-update_interval:]
else:
current_labels = labels[i % len(images) - update_interval:i %
len(images)]
# Update and print accuracy evaluations.
curves, preds = update_curves(curves,
current_labels,
n_classes,
spike_record=spike_record,
assignments=assignments,
proportions=proportions,
ngram_scores=ngram_scores,
n=2)
print_results(curves)
for scheme in preds:
predictions[scheme] = torch.cat((predictions[scheme], preds[scheme]),
-1)
if train:
if any([x[-1] > best_accuracy for x in curves.values()]):
print('New best accuracy! Saving network parameters to disk.')
# Save network to disk.
if train:
network.save(os.path.join(params_path, model_name + '.pt'))
path = os.path.join(
params_path, '_'.join(['auxiliary', model_name]) + '.pt')
torch.save((assignments, proportions, rates, ngram_scores),
open(path, 'wb'))
if train:
print('\nTraining complete.\n')
else:
print('\nTest complete.\n')
print('Average accuracies:\n')
for scheme in curves.keys():
print('\t%s: %.2f' % (scheme, float(np.mean(curves[scheme]))))
# Save accuracy curves to disk.
to_write = ['train'] + params if train else ['test'] + params
f = '_'.join([str(x) for x in to_write]) + '.pt'
torch.save((curves, update_interval, n_examples),
open(os.path.join(curves_path, f), 'wb'))
# Save results to disk.
results = [
np.mean(curves['all']),
np.mean(curves['proportion']),
np.mean(curves['ngram']),
np.max(curves['all']),
np.max(curves['proportion']),
np.max(curves['ngram'])
]
to_write = params + results if train else test_params + results
to_write = [str(x) for x in to_write]
name = 'train.csv' if train else 'test.csv'
if not os.path.isfile(os.path.join(results_path, name)):
with open(os.path.join(results_path, name), 'w') as f:
if train:
f.write(
'random_seed,n_neurons,n_train,inhib,lr,lr_decay,time,timestep,theta_plus,tc_theta_decay,intensity,'
'progress_interval,update_interval,mean_all_activity,mean_proportion_weighting,'
'mean_ngram,max_all_activity,max_proportion_weighting,max_ngram\n'
)
else:
f.write(
'random_seed,n_neurons,n_train,n_test,inhib,lr,lr_decay,time,timestep,theta_plus,tc_theta_decay,'
'intensity,progress_interval,update_interval,mean_all_activity,mean_proportion_weighting,'
'mean_ngram,max_all_activity,max_proportion_weighting,max_ngram\n'
)
with open(os.path.join(results_path, name), 'a') as f:
f.write(','.join(to_write) + '\n')
if labels.numel() > n_examples:
labels = labels[:n_examples]
else:
while labels.numel() < n_examples:
if 2 * labels.numel() > n_examples:
labels = torch.cat(
[labels, labels[:n_examples - labels.numel()]])
else:
labels = torch.cat([labels, labels])
# Compute confusion matrices and save them to disk.
confusions = {}
for scheme in predictions:
confusions[scheme] = confusion_matrix(labels, predictions[scheme])
to_write = ['train'] + params if train else ['test'] + test_params
f = '_'.join([str(x) for x in to_write]) + '.pt'
torch.save(confusions, os.path.join(confusion_path, f))
# Save full spike record to disk.
torch.save(full_spike_record, os.path.join(spikes_path, f))
def main():
#TEST
# hyperparameters
n_neurons = 100
n_test = 10000
inhib = 100
time = 350
dt = 1
intensity = 0.25
# extra args
progress_interval = 10
update_interval = 250
plot = True
seed = 0
train = True
gpu = False
n_classes = 10
n_sqrt = int(np.ceil(np.sqrt(n_neurons)))
# TESTING
assert n_test % update_interval == 0
np.random.seed(seed)
save_weights_fn = "plots_snn/weights/weights_test.png"
save_performance_fn = "plots_snn/performance/performance_test.png"
save_assaiments_fn = "plots_snn/assaiments/assaiments_test.png"
# load network
network = load('net_output.pt') # here goes file with network to load
network.train(False)
# pull dataset
data, targets = torch.load(
'data/MNIST/TorchvisionDatasetWrapper/processed/test.pt')
data = data * intensity
data_stretched = data.view(len(data), -1, 784)
testset = torch.utils.data.TensorDataset(data_stretched, targets)
testloader = torch.utils.data.DataLoader(testset,
batch_size=1,
shuffle=True)
# spike init
spike_record = torch.zeros(update_interval, time, n_neurons)
full_spike_record = torch.zeros(n_test, n_neurons).long()
# load parameters
assignments, proportions, rates, ngram_scores = torch.load(
'parameters_output.pt') # here goes file with parameters to load
# accuracy initialization
curves = {'all': [], 'proportion': [], 'ngram': []}
predictions = {scheme: torch.Tensor().long() for scheme in curves.keys()}
spikes = {}
for layer in set(network.layers):
spikes[layer] = Monitor(network.layers[layer],
state_vars=['s'],
time=time)
network.add_monitor(spikes[layer], name='%s_spikes' % layer)
print("Begin test.")
inpt_axes = None
inpt_ims = None
spike_ims = None
spike_axes = None
weights_im = None
assigns_im = None
perf_ax = None
i = 0
current_labels = torch.zeros(update_interval)
# test
test_time = t.time()
time1 = t.time()
for sample, label in testloader:
sample = sample.view(1, 1, 28, 28)
if i % progress_interval == 0:
print(f'Progress: {i} / {n_test} took {(t.time()-time1)*10000} s')
if i % update_interval == 0 and i > 0:
# update accuracy evaluation
curves, preds = update_curves(curves,
current_labels,
n_classes,
spike_record=spike_record,
assignments=assignments,
proportions=proportions,
ngram_scores=ngram_scores,
n=2)
print_results(curves)
for scheme in preds:
predictions[scheme] = torch.cat(
[predictions[scheme], preds[scheme]], -1)
sample_enc = poisson(datum=sample, time=time, dt=dt)
inpts = {'X': sample_enc}
# Run the network on the input.
network.run(inputs=inpts, time=time)
retries = 0
while spikes['Ae'].get('s').sum() < 1 and retries < 3:
retries += 1
sample = sample * 2
inpts = {'X': poisson(datum=sample, time=time, dt=dt)}
network.run(inputs=inpts, time=time)
# Spikes reocrding
spike_record[i % update_interval] = spikes['Ae'].get('s').view(
time, n_neurons)
full_spike_record[i] = spikes['Ae'].get('s').view(
time, n_neurons).sum(0).long()
if plot:
_input = sample.view(28, 28)
reconstruction = inpts['X'].view(time, 784).sum(0).view(28, 28)
_spikes = {layer: spikes[layer].get('s') for layer in spikes}
input_exc_weights = network.connections[('X', 'Ae')].w
square_assignments = get_square_assignments(assignments, n_sqrt)
assigns_im = plot_assignments(square_assignments, im=assigns_im)
if i % update_interval == 0: # plot weights on every update interval
square_weights = get_square_weights(
input_exc_weights.view(784, n_neurons), n_sqrt, 28)
weights_im = plot_weights(square_weights, im=weights_im)
[weights_im,
save_weights_fn] = plot_weights(square_weights,
im=weights_im,
save=save_weights_fn)
inpt_axes, inpt_ims = plot_input(_input,
reconstruction,
label=label,
axes=inpt_axes,
ims=inpt_ims)
spike_ims, spike_axes = plot_spikes(_spikes,
ims=spike_ims,
axes=spike_axes)
assigns_im = plot_assignments(square_assignments,
im=assigns_im,
save=save_assaiments_fn)
perf_ax = plot_performance(curves,
ax=perf_ax,
save=save_performance_fn)
plt.pause(1e-8)
current_labels[i % update_interval] = label[0]
network.reset_state_variables()
if i % 10 == 0 and i > 0:
preds = ngram(
spike_record[i % update_interval - 10:i % update_interval],
ngram_scores, n_classes, 2)
print(f'Predictions: {(preds*1.0).numpy()}')
print(
f'True value: {current_labels[i%update_interval-10:i%update_interval].numpy()}'
)
time1 = t.time()
i += 1
# Compute confusion matrices and save them to disk.
confusions = {}
for scheme in predictions:
confusions[scheme] = confusion_matrix(targets, predictions[scheme])
to_write = 'confusion_test'
f = '_'.join([str(x) for x in to_write]) + '.pt'
torch.save(confusions, os.path.join('.', f))
print("Test completed. Testing took " + str((t.time() - test_time) / 6) +
" min.")
def main(seed=0,
n_train=60000,
n_test=10000,
kernel_size=(8, ),
stride=(4, ),
n_filters=25,
n_full=100,
padding=0,
inhib=100,
time=100,
lr=1e-3,
lr_decay=0.99,
dt=1,
intensity=1,
progress_interval=10,
update_interval=250,
plot=False,
train=True,
gpu=False):
assert n_train % update_interval == 0 and n_test % update_interval == 0, \
'No. examples must be divisible by update_interval'
params = [
seed, n_train, kernel_size, stride, n_filters, n_full, padding, inhib,
time, lr, lr_decay, dt, intensity, update_interval
]
model_name = '_'.join([str(x) for x in params])
if not train:
test_params = [
seed, n_train, n_test, kernel_size, stride, n_filters, n_full,
padding, inhib, time, lr, lr_decay, dt, intensity, update_interval
]
np.random.seed(seed)
if gpu:
torch.set_default_tensor_type('torch.cuda.FloatTensor')
torch.cuda.manual_seed_all(seed)
else:
torch.manual_seed(seed)
n_examples = n_train if train else n_test
input_shape = [28, 28]
if kernel_size == input_shape:
conv_size = [1, 1]
else:
conv_size = (int((input_shape[0] - kernel_size[0]) / stride[0]) + 1,
int((input_shape[1] - kernel_size[1]) / stride[1]) + 1)
n_classes = 10
total_kernel_size = int(np.prod(kernel_size))
total_conv_size = int(np.prod(conv_size))
n_neurons = n_filters * total_conv_size
n_sqrt = int(np.ceil(np.sqrt(n_neurons)))
# Build network.
if train:
network = Network()
input_layer = Input(n=784, shape=(1, 1, 28, 28), traces=True)
conv_layer = DiehlAndCookNodes(n=n_filters * total_conv_size,
shape=(1, n_filters, *conv_size),
thresh=-64.0,
traces=True,
theta_plus=0.05,
refrac=0)
conv_layer_prime = LIFNodes(n=n_filters * total_conv_size,
shape=(1, n_filters, *conv_size),
refrac=0,
traces=True)
conv_conn = Conv2dConnection(input_layer,
conv_layer,
kernel_size=kernel_size,
stride=stride,
update_rule=PostPre,
norm=0.5 *
int(np.sqrt(total_kernel_size)),
nu=[0, lr],
wmax=2.0)
conv_conn_prime = Conv2dConnection(input_layer,
conv_layer_prime,
w=conv_conn.w,
kernel_size=kernel_size,
stride=stride,
nu=[0, 0],
wmax=2.0)
w = -inhib * torch.ones(n_filters, conv_size[0], conv_size[1],
n_filters, conv_size[0], conv_size[1])
for f in range(n_filters):
for i in range(conv_size[0]):
for j in range(conv_size[1]):
w[f, i, j, f, i, j] = 0
w = w.view(n_filters * conv_size[0] * conv_size[1],
n_filters * conv_size[0] * conv_size[1])
recurrent_conn = Connection(conv_layer, conv_layer, w=w)
full_layer = DiehlAndCookNodes(n=n_full,
thresh=-52.0,
traces=True,
theta_plus=0.05,
refrac=0)
full_layer_prime = LIFNodes(n=n_full, refrac=0)
full_conn = Connection(conv_layer_prime,
full_layer,
update_rule=PostPre,
norm=0.2 * n_neurons,
nu=[0, 10 * lr],
wmax=1)
full_conn_prime = Connection(conv_layer_prime,
full_layer_prime,
0,
wmax=1)
w = -inhib * (torch.ones(n_full, n_full) -
torch.diag(torch.ones(n_full)))
recurrent_conn2 = Connection(full_layer, full_layer, w=w)
network.add_layer(input_layer, name='X')
network.add_layer(conv_layer, name='Y')
network.add_layer(conv_layer_prime, name='Y_')
network.add_layer(full_layer, name='Z')
network.add_layer(full_layer_prime, name='Z_')
network.add_connection(conv_conn, source='X', target='Y')
network.add_connection(conv_conn_prime, source='X', target='Y_')
network.add_connection(recurrent_conn, source='Y', target='Y')
network.add_connection(full_conn, source='Y_', target='Z')
network.add_connection(full_conn_prime, source='Y_', target='Z_')
network.add_connection(recurrent_conn2, source='Z', target='Z')
# Voltage recording for excitatory and inhibitory layers.
voltage_monitor = Monitor(network.layers['Y'], ['v'], time=time)
network.add_monitor(voltage_monitor, name='output_voltage')
else:
network = load_network(os.path.join(params_path, model_name + '.pt'))
for connection in network.connections.values():
connection.update_rule = NoOp(connection, connection.nu)
connection.theta_decay = 0
connection.theta_plus = 0
# Load MNIST data.
dataset = MNIST(data_path, download=True)
if train:
images, labels = dataset.get_train()
else:
images, labels = dataset.get_test()
images *= intensity
# Record spikes during the simulation.
spike_record = torch.zeros(update_interval, time, n_full)
# Neuron assignments and spike proportions.
if train:
assignments = -torch.ones_like(torch.Tensor(n_full))
proportions = torch.zeros_like(torch.Tensor(n_full, n_classes))
rates = torch.zeros_like(torch.Tensor(n_full, n_classes))
logreg_model = LogisticRegression(warm_start=True,
n_jobs=-1,
solver='lbfgs')
logreg_model.coef_ = np.zeros([n_classes, n_full])
logreg_model.intercept_ = np.zeros(n_classes)
logreg_model.classes_ = np.arange(n_classes)
else:
path = os.path.join(params_path,
'_'.join(['auxiliary', model_name]) + '.pt')
assignments, proportions, rates, logreg_coef, logreg_intercept = torch.load(
open(path, 'rb'))
logreg_model = LogisticRegression(warm_start=True,
n_jobs=-1,
solver='lbfgs')
logreg_model.coef_ = logreg_coef
logreg_model.intercept_ = logreg_intercept
logreg_model.classes_ = np.arange(n_classes)
# Sequence of accuracy estimates.
curves = {'all': [], 'proportion': [], 'logreg': []}
predictions = {scheme: torch.Tensor().long() for scheme in curves.keys()}
if train:
best_accuracy = 0
spikes = {}
for layer in set(network.layers):
spikes[layer] = Monitor(network.layers[layer],
state_vars=['s'],
time=time)
network.add_monitor(spikes[layer], name='%s_spikes' % layer)
# Train the network.
if train:
print('\nBegin training.\n')
else:
print('\nBegin test.\n')
inpt_ims = None
inpt_axes = None
spike_ims = None
spike_axes = None
weights_im = None
weights_im2 = None
assigns_im = None
start = t()
for i in range(n_examples):
if i % progress_interval == 0:
print('Progress: %d / %d (%.4f seconds)' %
(i, n_examples, t() - start))
start = t()
if i % update_interval == 0 and i > 0:
if train:
network.connections['X', 'Y'].update_rule.nu[1] *= lr_decay
if i % len(labels) == 0:
current_labels = labels[-update_interval:]
else:
current_labels = labels[i % len(images) - update_interval:i %
len(images)]
# Update and print accuracy evaluations.
curves, preds = update_curves(curves,
current_labels,
n_classes,
spike_record=spike_record,
assignments=assignments,
proportions=proportions,
logreg=logreg_model)
print_results(curves)
for scheme in preds:
predictions[scheme] = torch.cat(
[predictions[scheme], preds[scheme]], -1)
# Save accuracy curves to disk.
to_write = ['train'] + params if train else ['test'] + params
f = '_'.join([str(x) for x in to_write]) + '.pt'
torch.save((curves, update_interval, n_examples),
open(os.path.join(curves_path, f), 'wb'))
if train:
if any([x[-1] > best_accuracy for x in curves.values()]):
print(
'New best accuracy! Saving network parameters to disk.'
)
# Save network to disk.
network.save(os.path.join(params_path, model_name + '.pt'))
path = os.path.join(
params_path,
'_'.join(['auxiliary', model_name]) + '.pt')
torch.save((assignments, proportions, rates,
logreg_model.coef_, logreg_model.intercept_),
open(path, 'wb'))
best_accuracy = max([x[-1] for x in curves.values()])
# Assign labels to excitatory layer neurons.
assignments, proportions, rates = assign_labels(
spike_record, current_labels, n_classes, rates)
# Refit logistic regression model.
logreg_model = logreg_fit(spike_record, current_labels,
logreg_model)
print()
# Get next input sample.
image = images[i % len(images)]
sample = bernoulli(datum=image, time=time, dt=dt,
max_prob=0.5).unsqueeze(1).unsqueeze(1)
inpts = {'X': sample}
# Run the network on the input.
network.run(inpts=inpts, time=time)
retries = 0
while spikes['Z'].get('s').sum() < 5 and retries < 3:
retries += 1
sample = bernoulli(datum=image,
time=time,
dt=dt,
max_prob=0.5 +
retries * 0.15).unsqueeze(1).unsqueeze(1)
inpts = {'X': sample}
network.run(inpts=inpts, time=time)
# Add to spikes recording.
spike_record[i % update_interval] = spikes['Z'].get('s').view(time, -1)
# Optionally plot various simulation information.
if plot:
_input = inpts['X'].view(time, 784).sum(0).view(28, 28)
w = network.connections['X', 'Y'].w
w2 = network.connections['Y_', 'Z'].w
_spikes = {
'X': spikes['X'].get('s').view(28**2, time),
'Y': spikes['Y'].get('s').view(n_neurons, time),
'Y_': spikes['Y_'].get('s').view(n_neurons, time),
'Z': spikes['Z'].get('s').view(n_full, time),
'Z_': spikes['Z_'].get('s').view(n_full, time)
}
square_assignments = get_square_assignments(assignments, n_sqrt)
inpt_axes, inpt_ims = plot_input(image.view(28, 28),
_input,
label=labels[i],
ims=inpt_ims,
axes=inpt_axes)
spike_ims, spike_axes = plot_spikes(spikes=_spikes,
ims=spike_ims,
axes=spike_axes)
weights_im = plot_conv2d_weights(w, im=weights_im, wmax=0.2)
weights_im2 = plot_weights(w2, im=weights_im2, wmax=1)
assigns_im = plot_assignments(square_assignments, im=assigns_im)
plt.pause(1e-8)
network.reset_() # Reset state variables.
print(f'Progress: {n_examples} / {n_examples} ({t() - start:.4f} seconds)')
i += 1
if i % len(labels) == 0:
current_labels = labels[-update_interval:]
else:
current_labels = labels[i % len(images) - update_interval:i %
len(images)]
# Update and print accuracy evaluations.
curves, preds = update_curves(curves,
current_labels,
n_classes,
spike_record=spike_record,
assignments=assignments,
proportions=proportions,
logreg=logreg_model)
print_results(curves)
for scheme in preds:
predictions[scheme] = torch.cat([predictions[scheme], preds[scheme]],
-1)
if train:
if any([x[-1] > best_accuracy for x in curves.values()]):
print('New best accuracy! Saving network parameters to disk.')
# Save network to disk.
network.save(os.path.join(params_path, model_name + '.pt'))
path = os.path.join(params_path,
'_'.join(['auxiliary', model_name]) + '.pt')
torch.save((assignments, proportions, rates, logreg_model.coef_,
logreg_model.intercept_), open(path, 'wb'))
if train:
print('\nTraining complete.\n')
else:
print('\nTest complete.\n')
print('Average accuracies:\n')
for scheme in curves.keys():
print('\t%s: %.2f' % (scheme, float(np.mean(curves[scheme]))))
# Save accuracy curves to disk.
to_write = ['train'] + params if train else ['test'] + params
to_write = [str(x) for x in to_write]
f = '_'.join(to_write) + '.pt'
torch.save((curves, update_interval, n_examples),
open(os.path.join(curves_path, f), 'wb'))
# Save results to disk.
results = [
np.mean(curves['all']),
np.mean(curves['proportion']),
np.mean(curves['logreg']),
np.max(curves['all']),
np.max(curves['proportion']),
np.max(curves['logreg'])
]
to_write = params + results if train else test_params + results
to_write = [str(x) for x in to_write]
name = 'train.csv' if train else 'test.csv'
if not os.path.isfile(os.path.join(results_path, name)):
with open(os.path.join(results_path, name), 'w') as f:
if train:
columns = [
'seed', 'n_train', 'kernel_size', 'stride', 'n_filters',
'padding', 'inhib', 'time', 'lr', 'lr_decay', 'dt',
'intensity', 'update_interval', 'mean_all_activity',
'mean_proportion_weighting', 'mean_logreg',
'max_all_activity', 'max_proportion_weighting',
'max_logreg'
]
header = ','.join(columns) + '\n'
f.write(header)
else:
columns = [
'seed', 'n_train', 'n_test', 'kernel_size', 'stride',
'n_filters', 'padding', 'inhib', 'time', 'lr', 'lr_decay',
'dt', 'intensity', 'update_interval', 'mean_all_activity',
'mean_proportion_weighting', 'mean_logreg',
'max_all_activity', 'max_proportion_weighting',
'max_logreg'
]
header = ','.join(columns) + '\n'
f.write(header)
with open(os.path.join(results_path, name), 'a') as f:
f.write(','.join(to_write) + '\n')
if labels.numel() > n_examples:
labels = labels[:n_examples]
else:
while labels.numel() < n_examples:
if 2 * labels.numel() > n_examples:
labels = torch.cat(
[labels, labels[:n_examples - labels.numel()]])
else:
labels = torch.cat([labels, labels])
# Compute confusion matrices and save them to disk.
confusions = {}
for scheme in predictions:
confusions[scheme] = confusion_matrix(labels, predictions[scheme])
to_write = ['train'] + params if train else ['test'] + test_params
f = '_'.join([str(x) for x in to_write]) + '.pt'
torch.save(confusions, os.path.join(confusion_path, f))
def main():
seed = 0 #random seed
n_neurons = 100 # number of neurons per layer
n_train = 60000 # number of traning examples to go through
n_epochs = 1
inh = 120.0 # strength of synapses from inh. layer to exci. layer
exc = 22.5
lr = 1e-2 # learning rate
lr_decay = 0.99 # learning rate decay
time = 350 # duration of each sample after running through possion encoder
dt = 1 # timestep
theta_plus = 0.05 # post spike threshold increase
tc_theta_decay = 1e7 # threshold decay
intensity = 0.25 # number to multiply input Diehl Cook maja 0.25
progress_interval = 10
update_interval = 250
plot = False
gpu = False
load_network = False # load network from disk
n_classes = 10
n_sqrt = int(np.ceil(np.sqrt(n_neurons)))
# TRAINING
save_weights_fn = "plots_snn/weights/weights_train.png"
save_performance_fn = "plots_snn/performance/performance_train.png"
save_assaiments_fn = "plots_snn/assaiments/assaiments_train.png"
directorys = [
"plots_snn", "plots_snn/weights", "plots_snn/performance",
"plots_snn/assaiments"
]
for directory in directorys:
if not os.path.exists(directory):
os.makedirs(directory)
assert n_train % update_interval == 0
np.random.seed(seed)
if gpu:
torch.set_default_tensor_type('torch.cuda.FloatTensor')
torch.cuda.manual_seed_all(seed)
else:
torch.manual_seed(seed)
# Build network
if load_network:
network = load('net_output.pt') # here goes file with network to load
else:
network = DiehlAndCook2015(
n_inpt=784,
n_neurons=n_neurons,
exc=exc,
inh=inh,
dt=dt,
norm=78.4,
nu=(1e-4, lr),
theta_plus=theta_plus,
inpt_shape=(1, 28, 28),
)
if gpu:
network.to("cuda")
# Pull dataset
data, targets = torch.load(
'data/MNIST/TorchvisionDatasetWrapper/processed/training.pt')
data = data * intensity
trainset = torch.utils.data.TensorDataset(data, targets)
trainloader = torch.utils.data.DataLoader(trainset,
batch_size=1,
shuffle=False,
num_workers=1)
# Spike recording
spike_record = torch.zeros(update_interval, time, n_neurons)
full_spike_record = torch.zeros(n_train, n_neurons).long()
# Intialization
if load_network:
assignments, proportions, rates, ngram_scores = torch.load(
'parameter_output.pt')
else:
assignments = -torch.ones_like(torch.Tensor(n_neurons))
proportions = torch.zeros_like(torch.Tensor(n_neurons, n_classes))
rates = torch.zeros_like(torch.Tensor(n_neurons, n_classes))
ngram_scores = {}
curves = {'all': [], 'proportion': [], 'ngram': []}
predictions = {scheme: torch.Tensor().long() for scheme in curves.keys()}
best_accuracy = 0
# Initilize spike records
spikes = {}
for layer in set(network.layers):
spikes[layer] = Monitor(network.layers[layer],
state_vars=['s'],
time=time)
network.add_monitor(spikes[layer], name='%s_spikes' % layer)
i = 0
current_labels = torch.zeros(update_interval)
inpt_axes = None
inpt_ims = None
spike_ims = None
spike_axes = None
weights_im = None
assigns_im = None
perf_ax = None
# train
train_time = t.time()
current_labels = torch.zeros(update_interval)
time1 = t.time()
for j in range(n_epochs):
i = 0
for sample, label in trainloader:
if i >= n_train:
break
if i % progress_interval == 0:
print(f'Progress: {i} / {n_train} took {(t.time()-time1)} s')
time1 = t.time()
if i % update_interval == 0 and i > 0:
#network.connections['X','Y'].update_rule.nu[1] *= lr_decay
curves, preds = update_curves(curves,
current_labels,
n_classes,
spike_record=spike_record,
assignments=assignments,
proportions=proportions,
ngram_scores=ngram_scores,
n=2)
print_results(curves)
for scheme in preds:
predictions[scheme] = torch.cat(
[predictions[scheme], preds[scheme]], -1)
# Accuracy curves
if any([x[-1] > best_accuracy for x in curves.values()]):
print(
'New best accuracy! Saving network parameters to disk.'
)
# Save network and parameters to disk.
network.save(os.path.join('net_output.pt'))
path = "parameters_output.pt"
torch.save((assignments, proportions, rates, ngram_scores),
open(path, 'wb'))
best_accuracy = max([x[-1] for x in curves.values()])
assignments, proportions, rates = assign_labels(
spike_record, current_labels, n_classes, rates)
ngram_scores = update_ngram_scores(spike_record,
current_labels, n_classes,
2, ngram_scores)
sample_enc = poisson(datum=sample, time=time, dt=dt)
inpts = {'X': sample_enc}
# Run the network on the input.
network.run(inputs=inpts, time=time)
retries = 0
# Spikes reocrding
spike_record[i % update_interval] = spikes['Ae'].get('s').view(
time, n_neurons)
full_spike_record[i] = spikes['Ae'].get('s').view(
time, n_neurons).sum(0).long()
if plot:
_input = sample.view(28, 28)
reconstruction = inpts['X'].view(time, 784).sum(0).view(28, 28)
_spikes = {layer: spikes[layer].get('s') for layer in spikes}
input_exc_weights = network.connections[('X', 'Ae')].w
square_assignments = get_square_assignments(
assignments, n_sqrt)
assigns_im = plot_assignments(square_assignments,
im=assigns_im)
if i % update_interval == 0:
square_weights = get_square_weights(
input_exc_weights.view(784, n_neurons), n_sqrt, 28)
weights_im = plot_weights(square_weights, im=weights_im)
[weights_im,
save_weights_fn] = plot_weights(square_weights,
im=weights_im,
save=save_weights_fn)
inpt_axes, inpt_ims = plot_input(_input,
reconstruction,
label=label,
axes=inpt_axes,
ims=inpt_ims)
spike_ims, spike_axes = plot_spikes(_spikes,
ims=spike_ims,
axes=spike_axes)
assigns_im = plot_assignments(square_assignments,
im=assigns_im,
save=save_assaiments_fn)
perf_ax = plot_performance(curves,
ax=perf_ax,
save=save_performance_fn)
plt.pause(1e-8)
current_labels[i % update_interval] = label[0]
network.reset_state_variables()
if i % 10 == 0 and i > 0:
preds = all_activity(
spike_record[i % update_interval - 10:i % update_interval],
assignments, n_classes)
print(f'Predictions: {(preds * 1.0).numpy()}')
print(
f'True value: {current_labels[i % update_interval - 10:i % update_interval].numpy()}'
)
i += 1
print(f'Number of epochs {j}/{n_epochs+1}')
torch.save(network.state_dict(), 'net_final.pt')
path = "parameters_final.pt"
torch.save((assignments, proportions, rates, ngram_scores),
open(path, 'wb'))
print("Training completed. Training took " +
str((t.time() - train_time) / 6) + " min.")
print("Saving network...")
network.save(os.path.join('net_final.pt'))
torch.save((assignments, proportions, rates, ngram_scores),
open('parameters_final.pt', 'wb'))
print("Network saved.")
