def check_gaussian_kl_divergence(self, mean, ln_var):
if self.wrap_m:
mean = chainer.Variable(mean)
if self.wrap_v:
ln_var = chainer.Variable(ln_var)
actual = cuda.to_cpu(
F.gaussian_kl_divergence(mean, ln_var, self.reduce).data)
actual = cuda.to_cpu(
F.gaussian_kl_divergence(mean, ln_var, self.reduce).data)
testing.assert_allclose(self.expect, actual)
def check_gaussian_kl_divergence(self, mean, ln_var):
if self.wrap_m:
mean = chainer.Variable(mean)
if self.wrap_v:
ln_var = chainer.Variable(ln_var)
actual = cuda.to_cpu(
F.gaussian_kl_divergence(mean, ln_var, self.reduce).data)
actual = cuda.to_cpu(
F.gaussian_kl_divergence(mean, ln_var, self.reduce).data)
testing.assert_allclose(self.expect, actual)
def __call__(self, x, test=False, k=4):
batch_size = x.data.shape[0]
w = x.data.shape[2]
tr, tg, tb = chainer.functions.split_axis(x, 3, 1)
tr = F.reshape(tr, (batch_size * w * w, ))
tg = F.reshape(tg, (batch_size * w * w, ))
tb = F.reshape(tb, (batch_size * w * w, ))
x = chainer.Variable(x.data.astype('f'))
z_mu, z_var = self.enc(x, test)
loss_kl = F.gaussian_kl_divergence(z_mu, z_var) / batch_size / self.k
loss_decode = 0
for _ in range(k):
z = F.gaussian(z_mu, z_var)
r, g, b = self.dec(z, test)
r = F.transpose(r, (0, 2, 3, 1))
r = F.reshape(r, (batch_size * w * w, 256))
g = F.transpose(g, (0, 2, 3, 1))
g = F.reshape(g, (batch_size * w * w, 256))
b = F.transpose(b, (0, 2, 3, 1))
b = F.reshape(b, (batch_size * w * w, 256))
loss_decode += F.softmax_cross_entropy(r, tr) / k
loss_decode += F.softmax_cross_entropy(g, tg) / k
loss_decode += F.softmax_cross_entropy(b, tb) / k
chainer.report({'loss_kl': loss_kl, 'loss_decode': loss_decode}, self)
beta = 0.2
return beta * loss_kl + (1 - beta) * loss_decode
def pretrain_step_vrae(self, x_input):
"""
Maximum likelihood Estimation
:param x_input:
:return: loss
"""
batch_size = len(x_input)
_, mu_z, ln_var_z = self.encoder.encode(x_input)
z = F.gaussian(mu_z, ln_var_z)
self.reset_state()
accum_loss = 0
self.lstm1.h = z
for i in range(self.sequence_length):
if i == 0:
x = chainer.Variable(
self.xp.asanyarray([self.start_token] * batch_size,
'int32'))
else:
x = chainer.Variable(
self.xp.asanyarray(x_input[:, i - 1], 'int32'))
scores = self.decode_one_step(x)
loss = F.softmax_cross_entropy(
scores,
chainer.Variable(self.xp.asanyarray(x_input[:, i], 'int32')))
accum_loss += loss
dec_loss = accum_loss / self.sequence_length
kl_loss = F.gaussian_kl_divergence(mu_z, ln_var_z) / batch_size
return dec_loss, kl_loss
def sample_g0(self, zs):
mu = self.l_g0_mu(zs)
ln_var = self.l_g0_ln_var(zs)
g_0 = F.gaussian(mu, ln_var)
batchsize = len(mu.data)
kl_g0 = gaussian_kl_divergence(mu, ln_var) / batchsize
return g_0, kl_g0
def update_core(self):
batch = self._iterators['main'].next()
x = Variable(self.converter(batch, self.device))
xp = cuda.get_array_module(x.data)
enc = self.enc
opt_enc = self._optimizers['enc']
dec = self.dec
opt_dec = self._optimizers['dec']
mu, ln_var = enc(x)
batchsize = len(mu.data)
rec_loss = 0
k = 10
for l in range(k):
z = F.gaussian(mu, ln_var)
rec_loss += F.bernoulli_nll(x, dec(
z, sigmoid=False)) / (k * batchsize)
loss = rec_loss + 1.0 * F.gaussian_kl_divergence(mu,
ln_var) / batchsize
enc.cleargrads()
dec.cleargrads()
loss.backward()
opt_enc.update()
opt_dec.update()
chainer.report({'rec_loss': rec_loss})
chainer.report({'loss': loss})
def _forward(self, batch, test=False):
# TrainingSetのEncodeとDecode
encoded, means, ln_vars = self._encode(batch, test=test)
rec = self._decode(encoded, test=test)
normer = reduce(lambda x, y: x*y, means.data.shape) # データ数
kl_loss = F.gaussian_kl_divergence(means, ln_vars)/normer
#print 'means={}'.format(means.data.shape)
#print 'ln_vars={}'.format(ln_vars.data.shape)
#print 'kl_loss={}, normer={}'.format(kl_loss.data, normer)
# zのサンプル
samp_p = np.random.standard_normal(means.data.shape).astype('float32')
z_p = chainer.Variable(samp_p)
if self.flag_gpu:
z_p.to_gpu()
rec_p = self._decode(z_p)
disc_rec, conv_layer_rec = self.disc(rec, test=test, dropout_ratio=self.dropout_ratio)
disc_batch, conv_layer_batch = self.disc(batch, test=test, dropout_ratio=self.dropout_ratio)
disc_x_p, conv_layer_x_p = self.disc(rec_p, test=test, dropout_ratio=self.dropout_ratio)
dif_l = F.mean_squared_error(conv_layer_rec, conv_layer_batch)
return kl_loss, dif_l, disc_rec, disc_batch, disc_x_p
def reconst(self, data, unregular=False):
if data.ndim == 1:
data = data.reshape(1,-1)
with chainer.using_config('train', False), chainer.using_config('enable_backprop', False):
e_mu,e_var = self.encode(Variable(data))
feat = F.gaussian(e_mu, e_var).data
d_out = self.decode(Variable(feat))
if self.is_gauss_dist:
rec = d_out[0].data
if unregular: # 非正則化項のやつ
d_mu, d_var = d_out
D_VAE = F.gaussian_kl_divergence(e_mu, e_var)
A_VAE = 0.5* ( np.log(2*np.pi) + d_var )
M_VAE = 0.5* ( data-d_mu )**2 * F.exp(-d_var)
return feat, rec, M_VAE.data
else:
rec = F.sigmoid(d_out).data
mse = np.mean( (rec-data)**2, axis=1 )
# lat_loss = F.gaussian_kl_divergence(e_mu, e_var)
# rec_loss = F.bernoulli_nll( Variable(data), d_out )
# vae_err = (lat_loss+rec_loss).data
return feat, rec, mse
def lf(frames):
mu, ln_var = self.encode(frames)
z = F.gaussian(mu, ln_var)
frames_flat = F.reshape(
frames,
(-1, frames.shape[1] * frames.shape[2] * frames.shape[3]))
variational_flat = F.reshape(
self.decode(z),
(-1, frames.shape[1] * frames.shape[2] * frames.shape[3]))
rec_loss = F.sum(F.square(frames_flat - variational_flat),
axis=1) # l2 reconstruction loss
rec_loss = F.mean(rec_loss)
kl_loss = F.sum(F.gaussian_kl_divergence(mu, ln_var, reduce="no"),
axis=1)
if self._cpu:
kl_tolerance = np.asarray(self.kl_tolerance *
self.n_latent).astype(np.float32)
else:
kl_tolerance = cp.asarray(self.kl_tolerance *
self.n_latent).astype(cp.float32)
kl_loss = F.maximum(kl_loss,
F.broadcast_to(kl_tolerance, kl_loss.shape))
kl_loss = F.mean(kl_loss)
loss = rec_loss + kl_loss
chainer.report({'loss': loss}, observer=self)
chainer.report({'kl_loss': kl_loss}, observer=self)
chainer.report({'rec_loss': rec_loss}, observer=self)
return loss
def __call__(self, xs, ys):
eos = self.xp.array([EOS], 'i')
xs = [self.denoiseInput(x[::-1], self.denoising_rate)
for x in xs] # denoising
#ys_d = [self.wordDropout(y, self.word_dropout) for y in ys] # word dropout
ys_d = [self.denoiseInput(y, self.word_dropout)
for y in ys] # word dropout
ys_in = [F.concat([eos, y], axis=0) for y in ys_d]
ys_out = [F.concat([y, eos], axis=0) for y in ys]
# Both xs and ys_in are lists of arrays.
exs = sequence_embed(self.embed_x, xs)
eys = sequence_embed(self.embed_y, ys_in)
batch = len(xs)
# None represents a zero vector in an encoder.
hx, at = self.encoder(None, exs) # layer x batch x n_units
hx_t = F.transpose(hx, (1, 0, 2)) # batch x layer x n_units
mu = self.W_mu(hx_t) # batch x n_latent
ln_var = self.W_ln_var(hx_t)
#print('{},{}'.format(mu.shape,ln_var.shape))
#print(hx_t.shape)
rec_loss = 0
concat_ys_out = F.concat(ys_out, axis=0)
for _ in range(self.k):
z = F.gaussian(mu, ln_var)
z_e = F.expand_dims(z, 2) # batch x n_latent x 1
Wz = self.W_h(z_e) # batch x (layer x unit)
#print('Wz: {}, {}'.format(Wz.shape, type(Wz)))
hys = F.split_axis(Wz, self.n_layers, 1) # layer x batch x unit
#print('hys, {}'.format([x.shape for x in hys]))
c_hy = F.concat([F.expand_dims(hy, 0) for hy in hys],
0) # layer x batch x unit
#print('c_hy: {}'.format(c_hy.shape))
_, os = self.decoder(c_hy, eys)
#print(len(os))
concat_os = F.concat(os, axis=0)
rec_loss += F.sum(
F.softmax_cross_entropy(self.W(concat_os),
concat_ys_out,
reduce='no')) / (self.k * batch)
latent_loss = F.gaussian_kl_divergence(mu, ln_var) / batch
loss = rec_loss + self.C * latent_loss
# wy = self.W(concat_os)
# ys = self.xp.argmax(wy.data, axis=1).astype('i')
# print(ys)
chainer.report({'loss': loss.data}, self)
chainer.report({'rec': rec_loss.data}, self)
chainer.report({'lat': latent_loss.data}, self)
n_words = concat_ys_out.shape[0]
perp = self.xp.exp(loss.data * batch / n_words)
chainer.report({'perp': perp}, self)
return loss
def free_energy(self, x):
#return -(free energy)
enc_mu, enc_log_sigma_2 = self.encode(x)
kl = F.gaussian_kl_divergence(enc_mu, enc_log_sigma_2)
z = F.gaussian(enc_mu, enc_log_sigma_2)
dec_mu = self.decode(z)
nll = F.bernoulli_nll(x, dec_mu)
return nll + kl
def free_energy(self,x):
#return -(free energy)
enc_mu, enc_log_sigma_2 = self.encode(x)
kl = F.gaussian_kl_divergence(enc_mu,enc_log_sigma_2)
z = F.gaussian(enc_mu,enc_log_sigma_2)
dec_mu = self.decode(z)
nll = F.bernoulli_nll(x,dec_mu)
return nll+kl
def compute_loss(self, x1, x2, t):
'''
Compute both encoders losses and decoder loss
Use KL divergence for encoder and Bernoulli loss for decoder
Input: two images and target (composition of both images)
Output: decoder loss, encoder1 loss, encoder2 loss
'''
mu1, ln_std1, mu2, ln_std2 = self.encode(x1, x2)
kl1 = F.gaussian_kl_divergence(mu1, ln_std1)
kl2 = F.gaussian_kl_divergence(mu2, ln_std2)
sample1 = F.gaussian(mu1, ln_std1)
sample2 = F.gaussian(mu2, ln_std2)
sample = F.concat((sample1, sample2))
output = self.decode(sample)
nll = F.bernoulli_nll(F.reshape(t, (t.shape[0], 1, 32, 32)), output)
return nll / (t.shape[0] * 32 *
32), kl1 / (x1.shape[0] * 32), kl2 / (x2.shape[0] * 32)
def __call__(self, x):
xp = self.encoder.xp
x = Variable(xp.asarray(x))
zm, zv = self.encoder((x,))
z = F.gaussian(zm, zv)
mean, ln_var = self.decoder((z,))
kl_loss = F.gaussian_kl_divergence(zm, zv)
nll_loss = F.gaussian_nll(x, mean, ln_var)
loss = kl_loss + nll_loss
return loss
def forward(self, batch, test=False):
out, means, ln_vars = self.encode(batch, test=test)
out = self.decode(out, test=test)
normer = reduce(lambda x, y: x * y, means.data.shape)
kl_loss = F.gaussian_kl_divergence(means, ln_vars) / normer
rec_loss = F.mean_squared_error(batch, out)
return out, kl_loss, rec_loss
def encode(self, bow):
""" Convert the bag of words vector of shape (n_docs, n_vocab)
into latent mean log variance vectors.
"""
lam = F.relu(self.l1(bow))
pi = F.relu(self.l2(lam))
mu, log_sigma = F.split_axis(self.mu_logsigma(pi), 2, 1)
sample = F.gaussian(mu, log_sigma)
loss = F.gaussian_kl_divergence(mu, log_sigma)
return sample, loss
def update(net, optimizer, x):
xp = cuda.get_array_module(x)
div_weight = 1
y, mean, var = net(x)
loss = F.mean_squared_error(x, y) + div_weight * F.gaussian_kl_divergence(mean, var) / float(y.size)
net.cleargrads()
loss.backward()
optimizer.update()
return loss
def forward(self, batch, test=False):
out, means, ln_vars = self.encode(batch, test=test)
out = self.decode(out, test=test)
normer = reduce(lambda x, y: x*y, means.data.shape)
kl_loss = F.gaussian_kl_divergence(means, ln_vars)/normer
rec_loss = F.mean_squared_error(batch, out)
return out, kl_loss, rec_loss
def __call__(self, x):
x = Variable(x)
start = time.time()
zm, zv = self.encoder((x,))
z = F.gaussian(zm, zv)
y = self.decoder((z,))[0]
kl_loss = F.gaussian_kl_divergence(zm, zv)
nll_loss = F.bernoulli_nll(x, y)
loss = kl_loss + nll_loss
return loss
def __call__(self, x, l):
mu, sigma = self.encoder(x)
self.KL = F.gaussian_kl_divergence(mu, sigma)
self.loss = Variable(np.array(0, dtype=np.float32))
for i in range(l):
sample = F.gaussian(mu, sigma)
m, s = self.decoder(sample)
self.loss += F.gaussian_nll(x, m, s)
self.loss = self.loss / l + self.KL
self.loss = self.loss / len(x)
return self.loss
def get_loss(self, x, y, train=True):
mu, ln_var = self.encode(x, y)
batchsize = len(mu.data)
# reconstruction loss
rec_loss = 0
z = F.gaussian(mu, ln_var)
rec_loss += F.bernoulli_nll(y, self.decode(z, x)) / (batchsize)
self.rec_loss = rec_loss
self.loss = self.rec_loss + F.gaussian_kl_divergence(
mu, ln_var) / batchsize
return self.loss
def loss(self, x, y):
batch_size = len(x)
mu, ln_var = self._latent_distribution(x)
z = self._sample(mu, ln_var)
reconstruction_loss = F.mean_squared_error(x, self.decode(z))
latent_loss = 0.0005 * F.gaussian_kl_divergence(mu,
ln_var) / batch_size
loss = reconstruction_loss + latent_loss
return loss
def pretrain_step_vrae_tag(self,
x_input,
tag,
word_drop_ratio=0.0,
train=True):
"""
Maximum likelihood Estimation
:param x_input:
:return: loss
"""
batch_size = len(x_input)
_, mu_z, ln_var_z = self.encoder.encode_with_tag(x_input, tag, train)
self.reset_state()
if self.latent_dim:
z = F.gaussian(mu_z, ln_var_z)
else:
latent = F.gaussian(mu_z, ln_var_z)
tag_ = self.tag_embed(
chainer.Variable(self.xp.array(tag, 'int32'),
volatile=not train))
self.lstm1.h = self.dec_input(F.concat((latent, tag_)))
z = None
accum_loss = 0
for i in range(self.sequence_length):
if i == 0:
x = chainer.Variable(self.xp.asanyarray([self.start_token] *
batch_size, 'int32'),
volatile=not train)
else:
if np.random.random() < word_drop_ratio and train:
x = chainer.Variable(self.xp.asanyarray(
[self.start_token] * batch_size, 'int32'),
volatile=not train)
else:
x = chainer.Variable(self.xp.asanyarray(
x_input[:, i - 1], 'int32'),
volatile=not train)
scores = self.decode_one_step(x, z=z)
loss = F.softmax_cross_entropy(
scores,
chainer.Variable(self.xp.asanyarray(x_input[:, i], 'int32'),
volatile=not train))
accum_loss += loss
dec_loss = accum_loss
kl_loss = F.gaussian_kl_divergence(mu_z, ln_var_z) / batch_size
return dec_loss, kl_loss
def forward(self, hs):
data_len = len(hs)
mu = self.l1_mu(hs)
ln_var = self.l1_ln_var(hs)
mu = F.leaky_relu(mu, slope=0.2)
ln_var = F.leaky_relu(ln_var, slope=0.2)
zs = F.gaussian(mu, ln_var)
loss = F.gaussian_kl_divergence(mu, ln_var) / data_len
return zs, loss
def lf(self, x, mu, ln_var, split=False):
batchsize = len(mu.data)
# reconstruction loss
rec_loss = 0
for l in range(k):
z = F.gaussian(mu, ln_var)
rec_loss += F.bernoulli_nll(x, self.decoder_model(z, sigmoid=False)) / (k * batchsize)
rec_loss = rec_loss
kl_loss = C * F.gaussian_kl_divergence(mu, ln_var) / batchsize
loss = rec_loss + kl_loss
if split:
return rec_loss, kl_loss
else:
return loss
def __call__(self, *args, beta=1.0):
assert len(args) >= 2
x = args[:-1]
t = args[-1]
mu_e, ln_var_e = self.predictor.encode(*x)
batchsize = len(mu_e.data)
rec_loss = 0
for l in six.moves.range(self.k):
z = F.gaussian(mu_e, ln_var_e)
mu_d, ln_var_d = self.predictor.decode(z)
rec_loss += F.gaussian_nll(t, mu_d, ln_var_d) / (self.k * batchsize)
kl_loss = beta * F.gaussian_kl_divergence(mu_e, ln_var_e) / batchsize
self.loss = rec_loss + kl_loss
reporter_module.report({'loss': self.loss}, self)
return self.loss
def term_feat(self, iloc, jloc, ival, jval, bs, nf, train=True):
# Change all of the shapes to form interaction vectors
shape = (bs, nf * 2, self.n_dim)
feat_mu_vec = F.broadcast_to(self.feat_mu_vec.b, shape)
feat_lv_vec = F.broadcast_to(self.feat_lv_vec.b, shape)
if not train:
feat_lv_vec += self.lv_floor
# Construct the interaction mean and variance
# iloc is (bs, nf), feat(iloc) is (bs, nf, ndim) and
# dot(feat, feat) is (bs, nf)
ivec = F.gaussian(feat_mu_vec + self.feat_delta_mu(iloc),
feat_lv_vec + self.feat_delta_lv(iloc))
jvec = F.gaussian(feat_mu_vec + self.feat_delta_mu(jloc),
feat_lv_vec + self.feat_delta_lv(jloc))
# feat is (bs, )
feat = dot(F.sum(ivec * jvec, axis=2), ival * jval)
# Compute the KLD for the group mean vector and variance vector
kld1 = F.gaussian_kl_divergence(self.feat_mu_vec.b, self.feat_lv_vec.b)
# Compute the KLD for vector deviations from the group mean and var
kld2 = F.gaussian_kl_divergence(self.feat_delta_mu.W,
self.feat_delta_lv.W)
return feat, kld1 + kld2
def gaussian_kl_divergence():
mu_data = np.array([1, 2, 3], dtype=np.float32)
mu = Variable(mu_data)
var_data = np.array([1, 4, 9], dtype=np.float32)
var = Variable(var_data)
ln_var = F.log(var)
dim = len(mu_data)
xp = cuda.get_array_module(var)
expected_kld = (xp.trace(xp.diag(var)) + mu_data.dot(mu_data) - dim -
xp.sum(ln_var)) * 0.5
computed_kld = F.gaussian_kl_divergence(mu, ln_var)
print('expected_kld: ', expected_kld)
print('computed_kld: ', computed_kld)
def __call__(self, x):
mu, ln_var = self.encoder(x)
batchsize = len(mu.array)
kl_penalty = F.gaussian_kl_divergence(mean=mu,
ln_var=ln_var) / batchsize
reconstr = 0
for l in range(self.k):
z = F.gaussian(mu, ln_var)
recon = self.decoder(z)
reconstr += 0.5 * F.mean_squared_error(
recon, x) * x.shape[2] * x.shape[3] * x.shape[4] / self.k
loss = (reconstr + self.beta * kl_penalty)
reporter.report({'loss': loss}, self)
reporter.report({'reconstr': reconstr}, self)
reporter.report({'kl_penalty': kl_penalty}, self)
return loss
def _train_vae(self, batch):
status = {}
(s, a, _, _, _) = batch
reconstructed_action, mean, ln_var = self._vae((s, a))
reconstruction_loss = F.mean_squared_error(reconstructed_action, a)
latent_loss = 0.5 * \
F.gaussian_kl_divergence(mean, ln_var, reduce='mean')
vae_loss = reconstruction_loss + latent_loss
self._vae_optimizer.target.cleargrads()
vae_loss.backward()
vae_loss.unchain_backward()
self._vae_optimizer.update()
xp = chainer.backend.get_array_module(vae_loss)
status['vae_loss'] = xp.array(vae_loss.array)
return status
def free_energy_onestep(self):
"""
[input]
x : BxHxW[mono] Bx3HW[color] matrix (Variable)
errx : BxHxW[mono] Bx3HW[color] matrix (Variable)
"""
self.c,self.h,enc_mu,enc_logsig2 = self.encode(self.c,self.h,self.x,self.errx,self.h2)
kl = F.gaussian_kl_divergence(enc_mu,enc_logsig2)
z = F.gaussian(enc_mu,enc_logsig2)
z = enc_mu
self.c2,self.h2,inc_canvas = self.decode(self.c2,self.h2,z)
self.canvas += inc_canvas
y = F.sigmoid(self.canvas)
#y = F.relu(self.canvas+0.5)-F.relu(self.canvas-0.5)
self.errx = self.x-y
self.t += 1
return y,kl
def evaluate(self):
iterator = self._iterators['main']
model = self._targets['model']
encoder = model.encoder
decoder = model.decoder
k = model.k
beta = model.beta
if hasattr(iterator, 'reset'):
iterator.reset()
it = iterator
else:
it = copy.copy(iterator)
summary = reporter.DictSummary()
for batch in it:
observation = {}
with reporter.report_scope(observation):
x = self.converter(batch, self.device)
with chainer.using_config('train',
False), chainer.using_config(
'enable_backprop', False):
mu, ln_var = encoder(x)
batchsize = len(mu.array)
kl_penalty = F.gaussian_kl_divergence(
mean=mu, ln_var=ln_var) / batchsize
reconstr = 0
for l in range(k):
z = F.gaussian(mu, ln_var)
recon = decoder(z)
reconstr += 0.5 * F.mean_squared_error(
recon,
x) * x.shape[2] * x.shape[3] * x.shape[4] / k
loss = (reconstr + beta * kl_penalty)
observation['validation/loss'] = loss
observation['validation/reconstr'] = reconstr
observation['validation/kl_penalty'] = kl_penalty
summary.add(observation)
return summary.compute_mean()
def calcLoss(self, t, mu, ln_var):
k = self.sample_size
kl_zero_epoch = self.kl_zero_epoch
loss = None
t_pred = [t_e[1:] + [2] for t_e in t]
t_pred = [xp.asarray(tp_e, dtype=xp.int32) for tp_e in t_pred]
t = self.denoiseInput(t)
print("t:{}".format([self.vocab.itos(t_e) for t_e in t[0]]))
t_vec = self.makeEmbedBatch(t)
for l in range(k):
z = F.gaussian(mu, ln_var)
if loss is None:
loss = self.decode(z, t_vec, t_pred) / (k * self.batch_size)
elif loss is not None:
loss += self.decode(z, t_vec, t_pred) / (k * self.batch_size)
C = 0.06 * (self.epoch_now - kl_zero_epoch) / self.epoch
if self.epoch_now > kl_zero_epoch:
loss += C * F.gaussian_kl_divergence(mu, ln_var) / self.batch_size
return loss
def lf(self, x):
"""AutoEncoder"""
mu, ln_var = self.encode(x)
# reconstruction loss
z = F.gaussian(mu, ln_var)
outputs_mu, outputs_sigma_2 = self.decode(z)
m_vae_loss = (F.flatten(x) - F.flatten(outputs_mu))**2 \
/ F.flatten(outputs_sigma_2)
m_vae_loss = 0.5 * F.sum(m_vae_loss)
a_vae_loss = F.log(2 * 3.14 * F.flatten(outputs_sigma_2))
a_vae_loss = 0.5 * F.sum(a_vae_loss)
d_vae_loss = F.gaussian_kl_divergence(mu, ln_var)
self.loss = F.mean(d_vae_loss + m_vae_loss + a_vae_loss)
return self.loss
def free_energy_onestep(self): #,h2,aa,bb):
"""
[input]
x : BxHxW[mono] 3BxHxW[color] matrix (Variable)
errx : BxHxW[mono] 3BxHxW[color] matrix (Variable)
"""
B = self.B
C = self.C
rP = self.Read_patch
wP = self.Write_patch
x_patch = self.R_filter.Filter(self.x)
#print("x_patch max",np.max(x_patch.data))
errx_patch = self.R_filter.Filter(self.errx)
#reshape 3BxHxW -> Bx3HW array
x_patch_2D = F.reshape(x_patch, (B, C * rP**2))
errx_patch_2D = F.reshape(errx_patch, (B, C * rP**2))
self.c, self.h, enc_mu, enc_logsig2 = self.encode(
self.c, self.h, x_patch_2D, errx_patch_2D, self.h2)
kl = F.gaussian_kl_divergence(enc_mu, enc_logsig2)
z = F.gaussian(enc_mu, enc_logsig2)
self.c2, self.h2, inc_canvas, Wmean_x, Wmean_y, Wln_var, Wln_stride, Wln_gamma, Rmean_x, Rmean_y, Rln_var, Rln_stride, Rln_gamma = self.decode(
self.c2, self.h2, z) #,aa,bb)
self.W_filter.mkFilter(Wmean_x, Wmean_y, Wln_var, Wln_stride,
Wln_gamma)
self.R_filter.mkFilter(Rmean_x, Rmean_y, Rln_var, Rln_stride,
Rln_gamma)
inc_canvas = F.reshape(inc_canvas, (B * C, wP, wP))
#print("Wfilter:",np.max(self.W_filter.Fx.data),np.min(self.W_filter.Fx.data),np.max(self.W_filter.Fy.data),np.min(self.W_filter.Fy.data))
#print("Wmean:{} {}, Wlnvar:{}, Wln_stride:{}, Wln_gamma:{}".format(Wmean_x.data,Wmean_y.data,Wln_var.data,Wln_stride.data,Wln_gamma.data))
inc_canvas = self.W_filter.InvFilter(inc_canvas)
self.canvas += inc_canvas
y = F.sigmoid(
self.canvas
) #F.relu(self.canvas+0.5)-F.relu(self.canvas-0.5) #[normal]:sigmoid, [whitened]:tanh
self.errx = self.x - y
self.t += 1
return y, kl #,h2
def calcLoss(self, t, categ_vec_h, categ_vec_c, mu, ln_var, wei_arr=None):
k = self.sample_size
loss = None
t_pred = [t_e[1:] + [2] for t_e in t]
t_pred = [xp.asarray(tp_e, dtype=xp.int32) for tp_e in t_pred]
t = self.denoiseInput(t)
t_vec = self.makeEmbedBatch(t)
for l in range(k):
z = F.gaussian(mu, ln_var)
if loss is None:
loss = self.decode(z, categ_vec_h, categ_vec_c, t_vec, t_pred,
wei_arr) / (k * self.batch_size)
elif loss is not None:
loss += self.decode(z, categ_vec_h, categ_vec_c, t_vec, t_pred,
wei_arr) / (k * self.batch_size)
C = 0.005 * (self.epoch_now - self.kl_zero_epoch) / self.epoch # 0.02
if self.epoch_now > self.kl_zero_epoch:
loss += C * F.gaussian_kl_divergence(mu, ln_var) / self.batch_size
return loss
def train_one(enc, gen, dis, optimizer_enc, optimizer_gen, optimizer_dis, x_batch, gpu_device):
batch_size = len(x_batch)
if gpu_device == None:
xp = np
else:
xp = cuda.cupy
# encode
x_in = xp.asarray(x_batch)
z0, mean, var = enc(Variable(x_in))
x0 = gen(z0)
y0, l0 = dis(x0)
loss_enc = F.gaussian_kl_divergence(mean, var) / float(l0.data.size)
loss_gen = 0
loss_gen = F.softmax_cross_entropy(y0, Variable(xp.zeros(batch_size).astype(np.int32)))
loss_dis = F.softmax_cross_entropy(y0, Variable(xp.ones(batch_size).astype(np.int32)))
# train generator
z1 = Variable(xp.random.normal(0, 1, (batch_size, latent_size)).astype(np.float32))
x1 = gen(z1)
y1, l1 = dis(x1)
loss_gen += F.softmax_cross_entropy(y1, Variable(xp.zeros(batch_size).astype(np.int32)))
loss_dis += F.softmax_cross_entropy(y1, Variable(xp.ones(batch_size).astype(np.int32)))
# train discriminator
y2, l2 = dis(Variable(xp.asarray(x_batch)))
loss_enc += F.mean_squared_error(l0, l2)
loss_gen += 0.1 * F.mean_squared_error(l0, l2)
loss_dis += F.softmax_cross_entropy(y2, Variable(xp.zeros(batch_size).astype(np.int32)))
optimizer_enc.zero_grads()
loss_enc.backward()
optimizer_enc.update()
optimizer_gen.zero_grads()
loss_gen.backward()
optimizer_gen.update()
optimizer_dis.zero_grads()
loss_dis.backward()
optimizer_dis.update()
return (float(loss_enc.data), float(loss_gen.data), float(loss_dis.data))
## lossのbuffer
sum_enc_loss = 0.
sum_dec_loss = 0.
sum_dis_loss = 0.
sum_gan_loss = 0.
sum_like_loss = 0.
sum_prior_loss = 0.
## バッチ学習
for i in six.moves.range(0, N_train, batchsize):
x = chainer.Variable(xp.asarray(x_train[perm[i:i + batchsize]])) # バッチ分のデータの抽出
##### ForwardとLossの計算
# KL距離
mu, ln_var = encode(x, test=False)
x_rec = decode(mu, sigmoid=True)
batchsize = len(mu.data)
kl_loss = F.gaussian_kl_divergence(mu, ln_var) / batchsize
# ランダムzの生成とランダムzでのdecode ## zはN(0, 1)から生成
z_p = xp.random.standard_normal(mu.data.shape).astype('float32')
z_p = chainer.Variable(z_p)
x_p = decode(z_p)
# Discriminatorの出力を得る
d_x_rec, h_out_rec = disc(x_rec)
d_x_base, h_out_base = disc(x)
d_x_p, h_out_p = disc(x_p)
# Discriminatorのsoftmax_cross_entropy
L_rec = F.softmax_cross_entropy(d_x_rec, Variable(xp.zeros(batchsize, dtype=np.int32)))
L_base = F.softmax_cross_entropy(d_x_base, Variable(xp.ones(batchsize, dtype=np.int32)))
L_p = F.softmax_cross_entropy(d_x_p, Variable(xp.zeros(batchsize, dtype=np.int32)))
def check_invalid_option(self, xp):
m = chainer.Variable(xp.asarray(self.mean))
v = chainer.Variable(xp.asarray(self.ln_var))
with self.assertRaises(ValueError):
F.gaussian_kl_divergence(m, v, 'invalid_option')
def check_gaussian_kl_divergence(self, mean, ln_var):
m = chainer.Variable(mean)
v = chainer.Variable(ln_var)
actual = cuda.to_cpu(F.gaussian_kl_divergence(m, v, self.reduce).data)
testing.assert_allclose(self.expect, actual)