def get_dataloaders(data_dir,
valid_part,
batch_size,
image_transforms,
show_transform=False,
show_sample=False):
'''
Divide ImageFolder with train set into train and validation parts using random shuffling.
'''
np.random.seed(12)
torch.manual_seed(12)
data = {
'train': datasets.ImageFolder(data_dir, image_transforms['train']),
'val': datasets.ImageFolder(data_dir, image_transforms['val']),
}
train_idx, valid_idx = [], []
counts = (data['train'].targets.count(i)
for i in data['train'].class_to_idx.values())
acc = 0
for numb in counts:
valid_split = int(np.floor(valid_part * numb))
indices = list(range(acc, acc + numb))
acc += numb
np.random.shuffle(indices)
train_idx.extend(indices[:numb - valid_split])
valid_idx.extend(indices[numb - valid_split:])
train_sampler = SubsetRandomSampler(train_idx)
valid_sampler = SubsetRandomSampler(valid_idx)
if show_transform:
show_transforms(data_dir, 0, 0, image_transforms['train'])
# exit()
# visualize some images
if show_sample:
sample_loader = DataLoader(
data['train'],
batch_size=9,
sampler=train_sampler,
)
data_iter = iter(sample_loader)
images, labels = data_iter.next()
plot_images(images, labels, data['train'].classes)
# exit()
# Dataloader iterators
dataloaders = {
'train':
DataLoader(data['train'],
batch_size=batch_size,
sampler=train_sampler,
drop_last=True),
'val':
DataLoader(data['val'],
batch_size=batch_size,
sampler=valid_sampler,
drop_last=True),
}
return dataloaders
def spiketrains(name, make = 1, plot = 1, mode = 0):
# mode: 0 is poisson
# 1 is integration
spike_file = "txt/%s_spikes_spiketrain.npy"%name
contr_file = "txt/%s_spikes_contrasts.npy"%name
spike_img = "images/%s_spiketrains.png"%name
l = 100 # number of samples for each patch
contrNr = 10
imgDim = 16
uDim = 248
dt = 0.02 # 20ms
same_int = 20 # how many integration points for one sample, in 20 ms
time_interp = arange(0, (l-1)*dt+dt/same_int, dt/same_int)
len_interp = len(time_interp)
if(make == 1):
k = 10 # 10 Hz
n = 1.1 # the exponent of nonlinearity
ut = 1.9 # the treshold potential
imgs = load('../patches/txt/patches_vanhateren_256.npy') #loadtxt('../patches/txt/patches_vanhateren_64.txt')
imgs = imgs.reshape(size(imgs)/imgDim**2, imgDim, imgDim)
imgNr = contrNr * size(imgs,0)
imgDB = zeros((imgNr, imgDim, imgDim))
for i in range(0, int(imgNr/contrNr)):
for j in range(0, contrNr):
imgDB[i*contrNr + j] = imgs[i] * ( (j+1) * 2.0/contrNr)
#plot_images(imgDB, "", "./images/imgDB.png",contr=False, rng=[0,3])
start = 0
end = 9
pointNr = 20
param_folder = "../parameters"
sigma = load("%s/sigma.npy"%param_folder)
A = load("%s/filters.npy"%param_folder)
C = load("%s/cov.npy"%param_folder)
# A = identity(dim**2) #numpy.random.random((16,16))
# C = identity(dim**2)
sum_cov = zeros(imgNr)
z_arr = zeros(imgNr)
spike_arr = zeros((imgNr, len_interp, uDim))
[sat, icorr, s, s2] = init_pux(A, C, start, end, pointNr, s2=sigma**2)
print ("done init pux")
for ni in range(0, imgNr): # imgNr
print ("img nr.%d"%ni)
[c, m, z] = pux_integration(imgDB[ni], sat, icorr, s, s2, start, end, pointNr)
z_arr[ni] = z
#sampling based on these values
samps = mixt_samp(c, m, s, l)
rates = rate_from_pot(samps, k, ut, n)
fnc = interpolate.interp1d(arange(0,l*dt,dt), rates, kind="cubic", axis=0)
rates_interp = fnc(time_interp)
rates_interp = rates_interp*(rates_interp>0)
# plt.plot(time_interp, rates_interp[:,3])
# plt.show()
if(mode == 0):
spike_arr[ni] = poisson(rates_interp * dt/same_int)
else:
spike_arr[ni] = integrate(rates_interp * dt/same_int)
#save spike_arr in sparse format
f = open(spike_file,'wb')
pickle.dump(sparse.coo_matrix(spike_arr.flatten()), f, -1)
f.close()
print (sum(spike_arr.reshape(imgNr*len_interp, uDim)))
save(contr_file, z_arr)
print ("done generating files")
else:
#load spike_arr from sparse format
f = open(spike_file,'rb')
spike_arr = pickle.load(f).todense().reshape(imgNr, len_interp, uDim)
z_arr = load(contr_file)
if (plot == 1):
small_spike_arr = zeros((imgNr, l, uDim))
for i in range(0, l):
small_spike_arr[:,i,:] = sum(spike_arr[:,same_int*i:same_int*(i+1),:] , axis = 1)
plot_images(small_spike_arr, "", spike_img, contr=False, rng=[0,100])
def gspiketrains(name, make = 1, plot = 1, mode = 0):
# mode: 0 is poisson
# 1 is integration
spike_file = "txt/%s_spikes_spiketrain.npy"%name
samp_file = "txt/%s_samps_spiketrain.npy"%name
rate_file = "txt/%s_rates_spiketrain.npy"%name
spike_img = "images/%s_spiketrains.png"%name
l = 200 # number of samples for each patch
imgNr = 16*16
dim = 2 # 8
dt = 0.02 # 20ms
same_int = 20 # how many integration points for one sample, in 20 ms
time_interp = arange(0, (l-1)*dt+dt/same_int, dt/same_int)
len_interp = len(time_interp)
if(make == 1):
C = rand(dim**2,dim**2)
C[0:2,0:2] = array([[1,0],[0,1]])
k = 10 # 10 Hz
n = 1.1 # the exponent of nonlinearity
ut = 1.9 # the treshold potential
z_arr = zeros(imgNr)
spike_arr = zeros((imgNr, len_interp, dim**2))
samp_arr = zeros((imgNr, l, dim**2))
rate_arr = zeros((imgNr, l, dim**2))
ma = uniform(0, 1, dim**2)
ma[0:2] = [0.5, 0.5]
for ni in range(0, imgNr):
print (ni)
a = ni/11.0 - 2
m = ma*ni/11.0 + a
samps = multivariate_normal(m,C,l)
samp_arr[ni] = samps
rates = rate_from_pot(samps, k, ut, n)
rate_arr[ni] = rates
fnc = interpolate.interp1d(arange(0,l*dt,dt), rates, kind="cubic", axis=0)
rates_interp = fnc(time_interp)
rates_interp = rates_interp*(rates_interp>0)
# plt.plot(time_interp, rates_interp[:,3])
# plt.show()
if(mode == 0):
spike_arr[ni] = poisson(rates_interp * dt/same_int)
else:
spike_arr[ni] = integrate(rates_interp * dt/same_int)
#save spike_arr in sparse format
f = open(spike_file,'wb')
pickle.dump(sparse.coo_matrix(spike_arr.flatten()), f, -1)
f.close()
f = open(samp_file,'wb')
pickle.dump(sparse.coo_matrix(samp_arr.flatten()), f, -1)
f.close()
f = open(rate_file,'wb')
pickle.dump(sparse.coo_matrix(rate_arr.flatten()), f, -1)
f.close()
else:
#load spike_arr from sparse format
f = open(spike_file,'rb')
spike_arr = pickle.load(f).todense().reshape(imgNr, len_interp, dim**2)
if (plot == 1):
small_spike_arr = zeros((imgNr, l, dim**2))
for i in range(0, l):
small_spike_arr[:,i,:] = sum(spike_arr[:,same_int*i:same_int*(i+1),:] , axis = 1)
plot_images(small_spike_arr, "", spike_img, contr=False, rng=[0,10])
def train(exp_dict):
S = exp_dict
torch.manual_seed(999)
data_dict = {}
data_dict['steps'] = []
data_dict['warmup'] = []
data_dict['welbo'] = []
if exp_dict['train_encoder_only']:
opt_all = optim.Adam(S['vae'].encoder.parameters(), lr=.0001)
print('training encoder only')
else:
opt_all = optim.Adam(S['vae'].parameters(), lr=.0001)
print('training encoder and decoder')
start_time = time.time()
step = 0
for step in range(0, S['max_steps'] + 1):
batch = get_batch(S['train_x'], S['batch_size'])
warmup = min((step + S['load_step']) / float(S['warmup_steps']), 1.)
outputs = S['vae'].forward(batch, warmup=warmup)
opt_all.zero_grad()
loss = -outputs['welbo']
loss.backward()
opt_all.step()
if step % S['display_step'] == 0:
print(
# 'S:{:5d}'.format(step+load_step),
'S:{:5d}'.format(step),
'T:{:.2f}'.format(time.time() - start_time),
# 'BPD:{:.4f}'.format(LL_to_BPD(outputs['elbo'].data.item())),
'welbo:{:.4f}'.format(outputs['welbo'].data.item()),
# 'elbo:{:.4f}'.format(outputs['elbo'].data.item()),
# 'lpx:{:.4f}'.format(outputs['logpx'].data.item()),
# 'lpz:{:.4f}'.format(outputs['logpz'].data.item()),
# 'lqz:{:.4f}'.format(outputs['logqz'].data.item()),
# 'lpx_v:{:.4f}'.format(valid_outputs['logpx'].data.item()),
# 'lpz_v:{:.4f}'.format(valid_outputs['logpz'].data.item()),
# 'lqz_v:{:.4f}'.format(valid_outputs['logqz'].data.item()),
# 'warmup:{:.4f}'.format(warmup),
)
start_time = time.time()
# model.eval()
# with torch.no_grad():
# valid_outputs = model.forward(x=valid_x[:50].cuda(), warmup=1., inf_net=infnet_valid)
# svhn_outputs = model.forward(x=svhn[:50].cuda(), warmup=1., inf_net=infnet_svhn)
# model.train()
if step > S['start_storing_data_step']:
data_dict['steps'].append(step)
data_dict['warmup'].append(warmup)
data_dict['welbo'].append(to_print(outputs['welbo']))
if step % S['trainingplot_steps'] == 0 and step > 0 and len(
data_dict['steps']) > 2:
plot_curve2(data_dict, S['exp_dir'])
if step % S['save_params_step'] == 0 and step > 0:
S['vae'].encoder.save_params_v3(S['params_dir'],
step,
name='encoder_params')
S['vae'].generator.save_params_v3(S['params_dir'],
step,
name='generator_params')
# model.save_params_v3(save_dir=params_dir, step=step+load_step)
# infnet_valid.save_params_v3(save_dir=params_dir, step=step+load_step, name='valid')
# infnet_svhn.save_params_v3(save_dir=params_dir, step=step+load_step, name='svhn')
if step % S['viz_steps'] == 0 and step > 0:
recon = to_print(outputs['x_hat']) #[B,784]
plot_images(to_print(batch), recon, S['images_dir'], step)
def train(exp_dict):
S = exp_dict
model = S['vae']
# torch.manual_seed(999)
data_dict = {}
data_dict['steps'] = []
data_dict['welbo'] = []
data_dict['lpx'] = []
data_dict['lpz'] = []
data_dict['lqz'] = []
data_dict['warmup'] = []
data_dict['lr'] = []
lr=.004
if exp_dict['train_encoder_only']:
opt_all = optim.Adam(model.encoder.parameters(), lr=lr, weight_decay=.0000001)
print ('training encoder only')
else:
opt_all = optim.Adam(model.parameters(), lr=lr, weight_decay=.0000001)
lr_sched = lr_scheduler.StepLR(opt_all, step_size=1, gamma=0.999995)
start_time = time.time()
step = 0
for step in range(0, S['max_steps'] + 1):
img_batch, text_batch = get_batch(image_dataset=S['train_x'], text_dataset=S['train_y'], batch_size=S['batch_size'])
# warmup = min((step+S['load_step']) / float(S['warmup_steps']), 1.)
# warmup = max(50. - (step / float(S['warmup_steps'])), 1.)
warmup = 1.
outputs = model.forward(img_batch, text_batch, warmup=warmup)
opt_all.zero_grad()
loss = -outputs['welbo']
loss.backward()
opt_all.step()
lr_sched.step()
if step%S['display_step']==0:
print(
# 'S:{:5d}'.format(step+load_step),
'S:{:5d}'.format(step),
'T:{:.2f}'.format(time.time() - start_time),
# 'BPD:{:.4f}'.format(LL_to_BPD(outputs['elbo'].data.item())),
'welbo:{:.4f}'.format(outputs['welbo'].data.item()),
'elbo:{:.4f}'.format(outputs['elbo'].data.item()),
'lpx:{:.4f}'.format(outputs['logpxz'].data.item()),
'lpz:{:.4f}'.format(outputs['logpz'].data.item()),
'lqz:{:.4f}'.format(outputs['logqz'].data.item()),
# 'lpx_v:{:.4f}'.format(valid_outputs['logpx'].data.item()),
# 'lpz_v:{:.4f}'.format(valid_outputs['logpz'].data.item()),
# 'lqz_v:{:.4f}'.format(valid_outputs['logqz'].data.item()),
'warmup:{:.2f}'.format(warmup),
)
start_time = time.time()
# model.eval()
# with torch.no_grad():
# valid_outputs = model.forward(x=valid_x[:50].cuda(),
# warmup=1., inf_net=infnet_valid)
# svhn_outputs = model.forward(x=svhn[:50].cuda(),
# warmup=1., inf_net=infnet_svhn)
# model.train()
if step > S['start_storing_data_step']:
data_dict['steps'].append(step)
data_dict['warmup'].append(warmup)
data_dict['welbo'].append(to_print(outputs['welbo']))
data_dict['lpx'].append(to_print(outputs['logpxz']))
data_dict['lpz'].append(to_print(outputs['logpz']))
data_dict['lqz'].append(to_print(outputs['logqz']))
data_dict['lr'].append(lr_sched.get_lr()[0])
if step % S['trainingplot_steps'] ==0 and step > 0 and len(data_dict['steps']) > 2:
plot_curve2(data_dict, S['exp_dir'])
if step % S['save_params_step'] ==0 and step > 0:
# model.encoder.save_params_v3(S['params_dir'], step, name='encoder_params')
# model.generator.save_params_v3(S['params_dir'], step, name='generator_params')
model.save_params_v3(S['params_dir'], step, name='model_params')
# model.save_params_v3(save_dir=params_dir, step=step+load_step)
# infnet_valid.save_params_v3(save_dir=params_dir, step=step+load_step, name='valid')
# infnet_svhn.save_params_v3(save_dir=params_dir, step=step+load_step, name='svhn')
if step % S['viz_steps']==0 and step > 0:
recon = to_print(outputs['x_hat']) #[B,784]
plot_images(to_print(img_batch), recon, S['images_dir'], step)
if (step % (int(S['viz_steps']/5))) ==0 and step > 0:
image1 = img_batch[0].view(1,3,112,112)
image2 = img_batch[1].view(1,3,112,112)
text1 = text_batch[0].view(1,9)
text2 = text_batch[1].view(1,9)
z = model.get_z(image1, text1)
new_image1 = model.generate_given_z_y(y=text1, z=z)
new_image2 = model.generate_given_z_y(y=text2, z=z)
plot_images_dif_zs(to_print(image1), to_print(image2),
get_sentence(question_idx_to_token, text1[0], [3,4]),
get_sentence(question_idx_to_token, text2[0], [3,4]),
to_print(new_image1), to_print(new_image2),
image_dir=S['images_dir'], step=step)