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bgan.py
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bgan.py
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import numpy as np
import tensorflow as tf
from collections import OrderedDict, defaultdict
from bgan_util import AttributeDict
from dcgan_ops import *
def conv_out_size(size, stride):
co = int(math.ceil(size / float(stride)))
return co
def kernel_sizer(size, stride):
ko = int(math.ceil(size / float(stride)))
if ko % 2 == 0:
ko += 1
return ko
class BDCGAN(object):
def __init__(self, x_dim, z_dim, dataset_size, batch_size=64, gf_dim=64, df_dim=64,
prior_std=1.0, J=1, M=1, eta=2e-4, num_layers=4,
alpha=0.01, lr=0.0002, optimizer='adam', wasserstein=False,
ml=False, J_d=None):
assert len(x_dim) == 3, "invalid image dims"
c_dim = x_dim[2]
self.is_grayscale = (c_dim == 1)
self.optimizer = optimizer.lower()
self.dataset_size = dataset_size
self.batch_size = batch_size
self.K = 2 # fake and real classes
self.x_dim = x_dim
self.z_dim = z_dim
self.gf_dim = gf_dim
self.df_dim = df_dim
self.c_dim = c_dim
self.lr = lr
# Bayes
self.prior_std = prior_std
self.num_gen = J
self.num_disc = J_d if J_d is not None else 1
self.num_mcmc = M
self.eta = eta
self.alpha = alpha
# ML
self.ml = ml
if self.ml:
assert self.num_gen == 1 and self.num_disc == 1 and self.num_mcmc == 1, "invalid settings for ML training"
self.noise_std = np.sqrt(2 * self.alpha * self.eta)
def get_strides(num_layers, num_pool):
interval = int(math.floor(num_layers/float(num_pool)))
strides = np.array([1]*num_layers)
strides[0:interval*num_pool:interval] = 2
return strides
self.num_pool = 4
self.max_num_dfs = 512
self.gen_strides = get_strides(num_layers, self.num_pool)
self.disc_strides = self.gen_strides
num_dfs = np.cumprod(np.array([self.df_dim] + list(self.disc_strides)))[:-1]
num_dfs[num_dfs >= self.max_num_dfs] = self.max_num_dfs # memory
self.num_dfs = list(num_dfs)
self.num_gfs = self.num_dfs[::-1]
self.construct_from_hypers(gen_strides=self.gen_strides, disc_strides=self.disc_strides,
num_gfs=self.num_gfs, num_dfs=self.num_dfs)
self.build_bgan_graph()
def construct_from_hypers(self, gen_kernel_size=5, gen_strides=[2,2,2,2],
disc_kernel_size=5, disc_strides=[2,2,2,2],
num_dfs=None, num_gfs=None):
self.d_batch_norm = AttributeDict([("d_bn%i" % dbn_i, batch_norm(name='d_bn%i' % dbn_i)) for dbn_i in range(len(disc_strides))])
self.sup_d_batch_norm = AttributeDict([("sd_bn%i" % dbn_i, batch_norm(name='sup_d_bn%i' % dbn_i)) for dbn_i in range(5)])
self.g_batch_norm = AttributeDict([("g_bn%i" % gbn_i, batch_norm(name='g_bn%i' % gbn_i)) for gbn_i in range(len(gen_strides))])
if num_dfs is None:
num_dfs = [self.df_dim, self.df_dim*2, self.df_dim*4, self.df_dim*8]
if num_gfs is None:
num_gfs = [self.gf_dim*8, self.gf_dim*4, self.gf_dim*2, self.gf_dim]
assert len(gen_strides) == len(num_gfs), "invalid hypers!"
assert len(disc_strides) == len(num_dfs), "invalid hypers!"
s_h, s_w = self.x_dim[0], self.x_dim[1]
ks = gen_kernel_size
self.gen_output_dims = OrderedDict()
self.gen_weight_dims = OrderedDict()
num_gfs = num_gfs + [self.c_dim]
self.gen_kernel_sizes = [ks]
for layer in range(len(gen_strides))[::-1]:
self.gen_output_dims["g_h%i_out" % (layer+1)] = (s_h, s_w)
assert gen_strides[layer] <= 2, "invalid stride"
assert ks % 2 == 1, "invalid kernel size"
self.gen_weight_dims["g_h%i_W" % (layer+1)] = (ks, ks, num_gfs[layer+1], num_gfs[layer])
self.gen_weight_dims["g_h%i_b" % (layer+1)] = (num_gfs[layer+1],)
s_h, s_w = conv_out_size(s_h, gen_strides[layer]), conv_out_size(s_w, gen_strides[layer])
ks = kernel_sizer(ks, gen_strides[layer])
self.gen_kernel_sizes.append(ks)
self.gen_weight_dims.update(OrderedDict([("g_h0_lin_W", (self.z_dim, num_gfs[0] * s_h * s_w)),
("g_h0_lin_b", (num_gfs[0] * s_h * s_w,))]))
self.gen_output_dims["g_h0_out"] = (s_h, s_w)
self.disc_weight_dims = OrderedDict()
s_h, s_w = self.x_dim[0], self.x_dim[1]
num_dfs = [self.c_dim] + num_dfs
ks = disc_kernel_size
self.disc_kernel_sizes = [ks]
for layer in range(len(disc_strides)):
assert disc_strides[layer] <= 2, "invalid stride"
assert ks % 2 == 1, "invalid kernel size"
self.disc_weight_dims["d_h%i_W" % layer] = (ks, ks, num_dfs[layer], num_dfs[layer+1])
self.disc_weight_dims["d_h%i_b" % layer] = (num_dfs[layer+1],)
s_h, s_w = conv_out_size(s_h, disc_strides[layer]), conv_out_size(s_w, disc_strides[layer])
ks = kernel_sizer(ks, disc_strides[layer])
self.disc_kernel_sizes.append(ks)
self.disc_weight_dims.update(OrderedDict([("d_h_end_lin_W", (num_dfs[-1] * s_h * s_w, num_dfs[-1])),
("d_h_end_lin_b", (num_dfs[-1],)),
("d_h_out_lin_W", (num_dfs[-1], self.K)),
("d_h_out_lin_b", (self.K,))]))
for k, v in self.gen_output_dims.items():
print "%s: %s" % (k, v)
print '****'
for k, v in self.gen_weight_dims.items():
print "%s: %s" % (k, v)
print '****'
for k, v in self.disc_weight_dims.items():
print "%s: %s" % (k, v)
def construct_nets(self):
self.num_disc_layers = 5
self.num_gen_layers = 5
self.d_batch_norm = AttributeDict([("d_bn%i" % dbn_i, batch_norm(name='d_bn%i' % dbn_i)) for dbn_i in range(self.num_disc_layers)])
self.sup_d_batch_norm = AttributeDict([("sd_bn%i" % dbn_i, batch_norm(name='sup_d_bn%i' % dbn_i)) for dbn_i in range(self.num_disc_layers)])
self.g_batch_norm = AttributeDict([("g_bn%i" % gbn_i, batch_norm(name='g_bn%i' % gbn_i)) for gbn_i in range(self.num_gen_layers)])
s_h, s_w = self.x_dim[0], self.x_dim[1]
s_h2, s_w2 = conv_out_size(s_h, 2), conv_out_size(s_w, 2)
s_h4, s_w4 = conv_out_size(s_h2, 2), conv_out_size(s_w2, 2)
s_h8, s_w8 = conv_out_size(s_h4, 2), conv_out_size(s_w4, 2)
s_h16, s_w16 = conv_out_size(s_h8, 2), conv_out_size(s_w8, 2)
self.gen_output_dims = OrderedDict([("g_h0_out", (s_h16, s_w16)),
("g_h1_out", (s_h8, s_w8)),
("g_h2_out", (s_h4, s_w4)),
("g_h3_out", (s_h2, s_w2)),
("g_h4_out", (s_h, s_w))])
self.gen_weight_dims = OrderedDict([("g_h0_lin_W", (self.z_dim, self.gf_dim * 8 * s_h16 * s_w16)),
("g_h0_lin_b", (self.gf_dim * 8 * s_h16 * s_w16,)),
("g_h1_W", (5, 5, self.gf_dim*4, self.gf_dim*8)),
("g_h1_b", (self.gf_dim*4,)),
("g_h2_W", (5, 5, self.gf_dim*2, self.gf_dim*4)),
("g_h2_b", (self.gf_dim*2,)),
("g_h3_W", (5, 5, self.gf_dim*1, self.gf_dim*2)),
("g_h3_b", (self.gf_dim*1,)),
("g_h4_W", (5, 5, self.c_dim, self.gf_dim*1)),
("g_h4_b", (self.c_dim,))])
self.disc_weight_dims = OrderedDict([("d_h0_W", (5, 5, self.c_dim, self.df_dim)),
("d_h0_b", (self.df_dim,)),
("d_h1_W", (5, 5, self.df_dim, self.df_dim*2)),
("d_h1_b", (self.df_dim*2,)),
("d_h2_W", (5, 5, self.df_dim*2, self.df_dim*4)),
("d_h2_b", (self.df_dim*4,)),
("d_h3_W", (5, 5, self.df_dim*4, self.df_dim*8)),
("d_h3_b", (self.df_dim*8,)),
("d_h_end_lin_W", (self.df_dim * 8 * s_h16 * s_w16, self.df_dim*4)),
("d_h_end_lin_b", (self.df_dim*4,)),
("d_h_out_lin_W", (self.df_dim*4, self.K)),
("d_h_out_lin_b", (self.K,))])
def _get_optimizer(self, lr):
if self.optimizer == 'adam':
return tf.train.AdamOptimizer(learning_rate=lr, beta1=0.5)
elif self.optimizer == 'sgd':
return tf.train.MomentumOptimizer(learning_rate=lr, momentum=0.5)
else:
raise ValueError("Optimizer must be either 'adam' or 'sgd'")
def initialize_wgts(self, scope_str):
if scope_str == "generator":
weight_dims = self.gen_weight_dims
numz = self.num_gen
elif scope_str == "discriminator":
weight_dims = self.disc_weight_dims
numz = self.num_disc
else:
raise RuntimeError("invalid scope!")
param_list = []
with tf.variable_scope(scope_str) as scope:
for zi in xrange(numz):
for m in xrange(self.num_mcmc):
wgts_ = AttributeDict()
for name, shape in weight_dims.iteritems():
wgts_[name] = tf.get_variable("%s_%04d_%04d" % (name, zi, m),
shape, initializer=tf.random_normal_initializer(stddev=0.02))
param_list.append(wgts_)
return param_list
def build_bgan_graph(self):
self.inputs = tf.placeholder(tf.float32,
[self.batch_size] + self.x_dim, name='real_images')
self.z = tf.placeholder(tf.float32, [self.batch_size, self.z_dim, self.num_gen], name='z')
self.z_sampler = tf.placeholder(tf.float32, [self.batch_size, self.z_dim], name='z_sampler')
# initialize generator weights
self.gen_param_list = self.initialize_wgts("generator")
self.disc_param_list = self.initialize_wgts("discriminator")
### build discrimitive losses and optimizers
# prep optimizer args
self.d_learning_rate = tf.placeholder(tf.float32, shape=[])
# compile all disciminative weights
t_vars = tf.trainable_variables()
self.d_vars = []
for di in xrange(self.num_disc):
for m in xrange(self.num_mcmc):
self.d_vars.append([var for var in t_vars if 'd_' in var.name and "_%04d_%04d" % (di, m) in var.name])
### build disc losses and optimizers
self.d_losses, self.d_optims, self.d_optims_adam = [], [], []
for di, disc_params in enumerate(self.disc_param_list):
d_probs, d_logits, _ = self.discriminator(self.inputs, self.K, disc_params)
constant_labels = np.zeros((self.batch_size, 2))
constant_labels[:, 1] = 1.0 # real
d_loss_real = tf.reduce_mean(tf.nn.softmax_cross_entropy_with_logits(logits=d_logits,
labels=tf.constant(constant_labels)))
d_loss_fakes = []
for gi, gen_params in enumerate(self.gen_param_list):
d_probs_, d_logits_, _ = self.discriminator(self.generator(self.z[:, :, gi % self.num_gen], gen_params),
self.K, disc_params)
constant_labels = np.zeros((self.batch_size, self.K))
constant_labels[:, 0] = 1.0 # class label indicating it came from generator, aka fake
d_loss_fake_ = tf.reduce_mean(tf.nn.softmax_cross_entropy_with_logits(logits=d_logits_,
labels=tf.constant(constant_labels)))
d_loss_fakes.append(d_loss_fake_)
d_losses = []
for d_loss_fake_ in d_loss_fakes:
d_loss_ = d_loss_real * float(self.num_gen) + d_loss_fake_
if not self.ml:
d_loss_ += self.disc_prior(disc_params) + self.disc_noise(disc_params)
d_losses.append(tf.reshape(d_loss_, [1]))
d_loss = tf.reduce_logsumexp(tf.concat(d_losses, 0))
self.d_losses.append(d_loss)
d_opt = self._get_optimizer(self.d_learning_rate)
self.d_optims.append(d_opt.minimize(d_loss, var_list=self.d_vars[di]))
d_opt_adam = tf.train.AdamOptimizer(learning_rate=self.d_learning_rate, beta1=0.5)
self.d_optims_adam.append(d_opt_adam.minimize(d_loss, var_list=self.d_vars[di]))
### build generative losses and optimizers
self.g_learning_rate = tf.placeholder(tf.float32, shape=[])
self.g_vars = []
for gi in xrange(self.num_gen):
for m in xrange(self.num_mcmc):
self.g_vars.append([var for var in t_vars if 'g_' in var.name and "_%04d_%04d" % (gi, m) in var.name])
self.g_losses, self.g_optims, self.g_optims_adam = [], [], []
for gi, gen_params in enumerate(self.gen_param_list):
gi_losses = []
for disc_params in self.disc_param_list:
d_probs_, d_logits_, d_features_fake = self.discriminator(self.generator(self.z[:, :, gi % self.num_gen],
gen_params),
self.K, disc_params)
_, _, d_features_real = self.discriminator(self.inputs, self.K, disc_params)
constant_labels = np.zeros((self.batch_size, self.K))
constant_labels[:, 1] = 1.0 # class label indicating that this fake is real
g_loss_ = tf.reduce_mean(tf.nn.softmax_cross_entropy_with_logits(logits=d_logits_,
labels=tf.constant(constant_labels)))
g_loss_ += tf.reduce_mean(huber_loss(d_features_real[-1], d_features_fake[-1]))
if not self.ml:
g_loss_ += self.gen_prior(gen_params) + self.gen_noise(gen_params)
gi_losses.append(tf.reshape(g_loss_, [1]))
g_loss = tf.reduce_logsumexp(tf.concat(gi_losses, 0))
self.g_losses.append(g_loss)
g_opt = self._get_optimizer(self.g_learning_rate)
self.g_optims.append(g_opt.minimize(g_loss, var_list=self.g_vars[gi]))
g_opt_adam = tf.train.AdamOptimizer(learning_rate=self.g_learning_rate, beta1=0.5)
self.g_optims_adam.append(g_opt_adam.minimize(g_loss, var_list=self.g_vars[gi]))
### build samplers
self.gen_samplers = []
for gi, gen_params in enumerate(self.gen_param_list):
self.gen_samplers.append(self.generator(self.z_sampler, gen_params))
def discriminator(self, image, K, disc_params, train=True):
with tf.variable_scope("discriminator") as scope:
h = image
for layer in range(len(self.disc_strides)):
if layer == 0:
h = lrelu(conv2d(h,
self.disc_weight_dims["d_h%i_W" % layer][-1],
name='d_h%i_conv' % layer,
k_h=self.disc_kernel_sizes[layer], k_w=self.disc_kernel_sizes[layer],
d_h=self.disc_strides[layer], d_w=self.disc_strides[layer],
w=disc_params["d_h%i_W" % layer], biases=disc_params["d_h%i_b" % layer]))
else:
h = lrelu(self.d_batch_norm["d_bn%i" % layer](conv2d(h,
self.disc_weight_dims["d_h%i_W" % layer][-1],
name='d_h%i_conv' % layer,
k_h=self.disc_kernel_sizes[layer], k_w=self.disc_kernel_sizes[layer],
d_h=self.disc_strides[layer], d_w=self.disc_strides[layer],
w=disc_params["d_h%i_W" % layer], biases=disc_params["d_h%i_b" % layer]), train=train))
h_end = lrelu(linear(tf.reshape(h, [self.batch_size, -1]),
self.df_dim*4, "d_h_end_lin",
matrix=disc_params.d_h_end_lin_W, bias=disc_params.d_h_end_lin_b)) # for feature norm
h_out = linear(h_end, K,
'd_h_out_lin',
matrix=disc_params.d_h_out_lin_W, bias=disc_params.d_h_out_lin_b)
return tf.nn.softmax(h_out), h_out, [h_end]
def generator(self, z, gen_params):
with tf.variable_scope("generator") as scope:
h = linear(z, self.gen_weight_dims["g_h0_lin_W"][-1], 'g_h0_lin',
matrix=gen_params.g_h0_lin_W, bias=gen_params.g_h0_lin_b)
h = tf.nn.relu(self.g_batch_norm.g_bn0(h))
h = tf.reshape(h, [self.batch_size, self.gen_output_dims["g_h0_out"][0],
self.gen_output_dims["g_h0_out"][1], -1])
for layer in range(1, len(self.gen_strides)+1):
out_shape = [self.batch_size, self.gen_output_dims["g_h%i_out" % layer][0],
self.gen_output_dims["g_h%i_out" % layer][1], self.gen_weight_dims["g_h%i_W" % layer][-2]]
h = deconv2d(h,
out_shape,
k_h=self.gen_kernel_sizes[layer-1], k_w=self.gen_kernel_sizes[layer-1],
d_h=self.gen_strides[layer-1], d_w=self.gen_strides[layer-1],
name='g_h%i' % layer,
w=gen_params["g_h%i_W" % layer], biases=gen_params["g_h%i_b" % layer])
if layer < len(self.gen_strides):
h = tf.nn.relu(self.g_batch_norm["g_bn%i" % layer](h))
return tf.nn.tanh(h)
def gen_prior(self, gen_params):
with tf.variable_scope("generator") as scope:
prior_loss = 0.0
for var in gen_params.values():
nn = tf.divide(var, self.prior_std)
prior_loss += tf.reduce_mean(tf.multiply(nn, nn))
prior_loss /= self.dataset_size
return prior_loss
def gen_noise(self, gen_params):
with tf.variable_scope("generator") as scope:
noise_loss = 0.0
for name, var in gen_params.iteritems():
noise_ = tf.contrib.distributions.Normal(mu=0., sigma=self.noise_std*tf.ones(var.get_shape()))
noise_loss += tf.reduce_sum(var * noise_.sample())
noise_loss /= self.dataset_size
return noise_loss
def disc_prior(self, disc_params):
with tf.variable_scope("discriminator") as scope:
prior_loss = 0.0
for var in disc_params.values():
nn = tf.divide(var, self.prior_std)
prior_loss += tf.reduce_mean(tf.multiply(nn, nn))
prior_loss /= self.dataset_size
return prior_loss
def disc_noise(self, disc_params):
with tf.variable_scope("discriminator") as scope:
noise_loss = 0.0
for var in disc_params.values():
noise_ = tf.contrib.distributions.Normal(mu=0., sigma=self.noise_std*tf.ones(var.get_shape()))
noise_loss += tf.reduce_sum(var * noise_.sample())
noise_loss /= self.dataset_size
return noise_loss