def estimator(A_val, y_batch_val, hparams):
"""Function that returns the estimated image"""
best_keeper = utils.BestKeeper(hparams)
feed_dict = {A: A_val, y_batch: y_batch_val}
for i in range(hparams.num_random_restarts):
sess.run([z_batch.initializer])
for j in range(hparams.max_update_iter):
_, lr_val, total_loss_val, \
m_loss1_val, \
m_loss2_val, \
zp_loss_val = sess.run([update_op, learning_rate, total_loss,
m_loss1,
m_loss2,
zp_loss], feed_dict=feed_dict)
logging_format = 'rr {} iter {} lr {} total_loss {} m_loss1 {} m_loss2 {} zp_loss {}'
print logging_format.format(i, j, lr_val, total_loss_val,
m_loss1_val, m_loss2_val,
zp_loss_val)
if hparams.gif and ((j % hparams.gif_iter) == 0):
images = sess.run(x_hat_batch, feed_dict=feed_dict)
for im_num, image in enumerate(images):
save_dir = '{0}/{1}/'.format(hparams.gif_dir, im_num)
utils.set_up_dir(save_dir)
save_path = save_dir + '{0}.png'.format(j)
image = image.reshape(hparams.image_shape)
save_image(image, save_path)
x_hat_batch_val, total_loss_batch_val = sess.run(
[x_hat_batch, total_loss_batch], feed_dict=feed_dict)
best_keeper.report(x_hat_batch_val, total_loss_batch_val)
return best_keeper.get_best()
def estimator(A_val, y_batch_val, hparams):
"""Function that returns the estimated image"""
best_keeper = utils.BestKeeper(hparams)
if hparams.measurement_type == 'project':
# if y_batch_val.shape[0]!=hparams.batch_size:
# y_batch_val_tmp = np.zeros((hparams.batch_size,hparams.num_measurements))
# y_batch_val_tmp[:y_batch_val.shape[0],:] = y_batch_val
# y_batch_val = y_batch_val_tmp
# print('Smaller INPUT NUMBER')#Or change hparams on the fly
feed_dict = {y_batch: y_batch_val}
else:
feed_dict = {A: A_val, y_batch: y_batch_val}
for i in range(hparams.num_random_restarts):
sess.run(opt_reinit_op)
for j in range(hparams.max_update_iter):
_, lr_val, total_loss_val, \
m_loss1_val, \
m_loss2_val, \
zp_loss_val = sess.run([update_op, learning_rate, total_loss,
m_loss1,
m_loss2,
zp_loss], feed_dict=feed_dict)
logging_format = 'rr {} iter {} lr {} total_loss {} m_loss1 {} m_loss2 {} zp_loss {}'
print(
logging_format.format(i, j, lr_val, total_loss_val,
m_loss1_val, m_loss2_val,
zp_loss_val))
#print('n_z is {}'.format(hparams.n_z))
if total_loss_val == m_loss2_val and zp_loss_val > 0 and hparams.zprior_weight > 0:
raise ValueError('NONONO')
if hparams.gif and ((j % hparams.gif_iter) == 0):
images = sess.run(x_hat_batch, feed_dict=feed_dict)
for im_num, image in enumerate(images):
save_dir = '{0}/{1}/'.format(hparams.gif_dir, im_num)
utils.set_up_dir(save_dir)
save_path = save_dir + '{0}.png'.format(j)
image = image.reshape(hparams.image_shape)
save_image(image, save_path)
x_hat_batch_val, total_loss_batch_val = sess.run(
[x_hat_batch, total_loss_batch], feed_dict=feed_dict)
best_keeper.report(x_hat_batch_val, total_loss_batch_val)
return best_keeper.get_best()
def estimator(Tx_val, Rx_val, Pilot_val, hparams):
"""Function that returns the estimated image"""
best_keeper = utils.BestKeeper(hparams)
if hparams.measurement_type == 'project':
feed_dict = {y_batch: y_batch_val}
else:
feed_dict = {Tx: Tx_val, Rx: Rx_val, Pilot: Pilot_val}
for i in range(hparams.num_random_restarts):
sess.run(opt_reinit_op)
for j in range(hparams.max_update_iter):
if hparams.gif and ((j % hparams.gif_iter) == 0):
images = sess.run(x_hat_batch, feed_dict=feed_dict)
for im_num, image in enumerate(images):
save_dir = '{0}/{1}/'.format(hparams.gif_dir, im_num)
utils.set_up_dir(save_dir)
save_path = save_dir + '{0}.png'.format(j)
image = image.reshape(hparams.image_shape)
save_image(image, save_path)
_, lr_val, total_loss_val, \
m_loss1_val, \
m_loss2_val, \
zp_loss_val = sess.run([update_op, learning_rate, total_loss,
m_loss1,
m_loss2,
zp_loss], feed_dict=feed_dict)
logging_format = 'rr {} iter {} lr {} total_loss {} m_loss1 {} m_loss2 {} zp_loss {}'
print logging_format.format(i, j, lr_val, total_loss_val,
m_loss1_val, m_loss2_val,
zp_loss_val)
H_hat_val, total_loss_val = sess.run([H_hat, total_loss],
feed_dict=feed_dict)
best_keeper.report(H_hat_val, total_loss_val)
return best_keeper.get_best()
def stage_i(A_val,y_batch_val,hparams,hid_i,init_obj,early_stop,bs,optim,recovered=False):
model_def = globals()['model_def']
m_loss1_batch_dict = {}
m_loss2_batch_dict = {}
zp_loss_batch_dict = {}
total_loss_dict = {}
x_hat_batch_dict = {}
model_selection = ModelSelect(hparams)
hid_i=int(hid_i)
# print('Matrix norm is {}'.format(np.linalg.norm(A_val)))
# hparams.eps = hparams.eps * np.linalg.norm(A_val)
# Get a session
sess = tf.Session()
# Set up palceholders
A = tf.placeholder(tf.float32, shape=(hparams.n_input, hparams.num_measurements), name='A')
y_batch = tf.placeholder(tf.float32, shape=(hparams.batch_size, hparams.num_measurements), name='y_batch')
# Create the generator
model_hparams = model_def.Hparams()
model_hparams.n_z = hparams.n_z
model_hparams.stdv = hparams.stdv
model_hparams.mean = hparams.mean
model_hparams.grid = copy.deepcopy(hparams.grid)
model_selection.setup_dim(hid_i,model_hparams)
if not hparams.model_types[0] == 'vae-flex-alt' and 'alt' in hparams.model_types[0]:
model_def.ignore_grid = next((j for j in model_selection.dim_list if j >= hid_i), None)
#set up the initialization
print('The initialization is: {}'.format(init_obj.mode))
if init_obj.mode=='random':
z_batch = model_def.get_z_var(model_hparams,hparams.batch_size,hid_i)
elif init_obj.mode in ['previous-and-random','only-previous']:
z_batch = model_def.get_z_var(model_hparams,hparams.batch_size,hid_i)
init_op_par = tf.assign(z_batch, truncate_val(model_hparams,hparams,hid_i,init_obj,stdv=0))
else:
z_batch = truncate_val(model_hparams,hparams,hid_i,init_obj,stdv=0.1)
_, x_hat_batch, _ = model_def.generator_i(model_hparams, z_batch, 'gen', hparams.bol,hid_i,relative=False)
x_hat_batch_dict[hid_i] = x_hat_batch
# measure the estimate
if hparams.measurement_type == 'project':
y_hat_batch = tf.identity(x_hat_batch, name='y_hat_batch')
else:
y_hat_batch = tf.matmul(x_hat_batch, A, name='y_hat_batch')
# define all losses
m_loss1_batch = tf.reduce_mean(tf.abs(y_batch - y_hat_batch), 1)
m_loss2_batch = tf.reduce_mean((y_batch - y_hat_batch)**2, 1)
if hparams.stdv>0:
norm_val = 1/(hparams.stdv**2)
else:
norm_val = 1e+20
zp_loss_batch = tf.reduce_sum((z_batch-tf.ones(tf.shape(z_batch))*hparams.mean)**2*norm_val, 1) #added normalization
# define total loss
total_loss_batch = hparams.mloss1_weight * m_loss1_batch \
+ hparams.mloss2_weight * m_loss2_batch \
+ hparams.zprior_weight * zp_loss_batch
total_loss = tf.reduce_mean(total_loss_batch)
total_loss_dict[hid_i] = total_loss
# Compute means for logging
m_loss1 = tf.reduce_mean(m_loss1_batch)
m_loss2 = tf.reduce_mean(m_loss2_batch)
zp_loss = tf.reduce_mean(zp_loss_batch)
m_loss1_batch_dict[hid_i] = m_loss1
m_loss2_batch_dict[hid_i] = m_loss2
zp_loss_batch_dict[hid_i] = zp_loss
# Set up gradient descent
var_list = [z_batch]
if recovered:
global_step = tf.Variable(hparams.optim.global_step, trainable=False, name='global_step')
else:
global_step = tf.Variable(0, trainable=False, name='global_step')
learning_rate = utils.get_learning_rate(global_step, hparams)
opt = utils.get_optimizer(learning_rate, hparams)
update_op = opt.minimize(total_loss, var_list=var_list, global_step=global_step, name='update_op')
opt_reinit_op = utils.get_opt_reinit_op(opt, var_list, global_step)
# Intialize and restore model parameters
init_op = tf.global_variables_initializer()
sess.run(init_op)
#restore the setting
if 'alt' in hparams.model_types[0]:
factor = 1
else:
factor = len(hparams.grid)
model_def.batch_size = hparams.batch_size*factor #changes object (call by reference), necessary, since call of generator_i might change batch size.
model_selection.restore(sess,hid_i)
if recovered:
best_keeper = hparams.optim.best_keeper
else:
best_keeper = utils.BestKeeper(hparams,logg_z=True)
if hparams.measurement_type == 'project':
feed_dict = {y_batch: y_batch_val}
else:
feed_dict = {A: A_val, y_batch: y_batch_val}
flag = False
for i in range(init_obj.num_random_restarts):
if recovered and i <= hparams.optim.i: #Loosing optimizer's state, keras implementation maybe better
if i < hparams.optim.i:
continue
else:
sess.run(utils.get_opt_reinit_op(opt, [], global_step))
sess.run(tf.assign(z_batch,hparams.optim.z_batch))
else:
sess.run(opt_reinit_op)
if i<1 and init_obj.mode in ['previous-and-random','only-previous']:
print('Using previous outcome as starting point')
sess.run(init_op_par)
for j in range(hparams.max_update_iter):
if recovered and j < hparams.optim.j:
continue
_, lr_val, total_loss_val, \
m_loss1_val, \
m_loss2_val, \
zp_loss_val = sess.run([update_op, learning_rate, total_loss,
m_loss1,
m_loss2,
zp_loss], feed_dict=feed_dict)
if hparams.gif and ((j % hparams.gif_iter) == 0):
images = sess.run(x_hat_batch, feed_dict=feed_dict)
for im_num, image in enumerate(images):
save_dir = '{0}/{1}/{2}/'.format(hparams.gif_dir, hid_i,im_num)
utils.set_up_dir(save_dir)
save_path = save_dir + '{0}.png'.format(j)
image = image.reshape(hparams.image_shape)
save_image(image, save_path)
if j%100==0 and early_stop:
x_hat_batch_val = sess.run(x_hat_batch, feed_dict=feed_dict)
if check_tolerance(hparams,A_val,x_hat_batch_val,y_batch_val)[1]:
flag = True
print('Early stopping')
break
if j%25==0:#Now not every turn
logging_format = 'hid {} rr {} iter {} lr {} total_loss {} m_loss1 {} m_loss2 {} zp_loss {}'
print( logging_format.format(hid_i, i, j, lr_val, total_loss_val,
m_loss1_val,
m_loss2_val,
zp_loss_val))
if j%100==0:
x_hat_batch_val, total_loss_batch_val, z_batch_val = sess.run([x_hat_batch, total_loss_batch,z_batch], feed_dict=feed_dict)
best_keeper.report(x_hat_batch_val, total_loss_batch_val,z_val=z_batch_val)
optim.global_step = sess.run(global_step)
optim.A = A_val
optim.y_batch = y_batch_val
optim.i=i
optim.j=j
optim.z_batch= z_batch_val
optim.best_keeper=best_keeper
optim.bs=bs
optim.init_obj = init_obj
utils.save_to_pickle(optim,utils.get_checkpoint_dir(hparams, hparams.model_types[0])+'tmp/optim.pkl')
print('Checkpoint of optimization created')
hparams.optim.j = 0
x_hat_batch_val, total_loss_batch_val, z_batch_val = sess.run([x_hat_batch, total_loss_batch,z_batch], feed_dict=feed_dict)
best_keeper.report(x_hat_batch_val, total_loss_batch_val,z_val=z_batch_val)
if flag:
break
tf.reset_default_graph()
return best_keeper.get_best()