class ConvDRAW(object):
def __init__(self, d, lr, lambda_z_wu, read_attn, write_attn, do_classify,
do_reconst):
self.do_classify = do_classify
""" flags for each regularizor """
self.do_reconst = do_reconst
self.read_attn = read_attn
self.write_attn = write_attn
""" dataset information """
self.set_datainfo(d)
""" external toolkits """
self.ls = Layers()
self.lf = LossFunctions(self.ls, self.d, self.encoder)
self.ii = ImageInterface(_is_3d, self.read_attn, self.write_attn,
GLIMPSE_SIZE_READ, GLIMPSE_SIZE_WRITE, _h, _w,
_c)
# for refference from get_loss_kl_draw()
self.T = T
self.L = L
self.Z_SIZES = Z_SIZES
""" placeholders defined outside"""
self.lr = lr
self.lambda_z_wu = lambda_z_wu
"""sequence of canvases """
self.cs = [0] * T
""" initialization """
self.init_lstms()
self.init_time_zero()
""" workaround for variable_scope(reuse=True) """
self.DO_SHARE = None
def set_datainfo(self, d):
self.d = d # dataset manager
global _b, _h, _w, _c, _img_size, _is_3d
_b = d.batch_size
_h = d.h
_w = d.w
_c = d.c
_img_size = d.img_size
_is_3d = d.is_3d
def init_time_zero(self):
self.cs[0] = tf.zeros((_b, _h, _w, _c)) if _is_3d else tf.zeros(
(_b, _img_size))
self.h_dec[0][0] = tf.zeros((_b, RNN_SIZES[0]))
def init_lstms(self):
h_enc, e_mus, e_logsigmas = [[0] * L] * (T + 1), [[0] * L] * (
T + 1), [[0] * L] * (T + 1) # q(z_i+1 | z_i), bottom-up inference
h_dec, d_mus, d_logsigmas = [[0] * L] * (T + 1), [[0] * L] * (
T + 1), [[0] * L] * (T + 1) # q(z_i | .), bidirectional inference
p_mus, p_logsigmas = [[0] * L] * (T + 1), [[0] * L] * (
T + 1) # p(z_i | z_i+1), top-down prior
""" set-up LSTM cells """
e_cells, e_states = [None] * L, [None] * L
d_cells, d_states = [None] * L, [None] * L
for l in range(L):
e_cells[l] = tf.contrib.rnn.core_rnn_cell.LSTMCell(RNN_SIZES[l])
d_cells[l] = tf.contrib.rnn.core_rnn_cell.LSTMCell(RNN_SIZES[l])
e_states[l] = e_cells[l].zero_state(_b, tf.float32)
d_states[l] = d_cells[l].zero_state(_b, tf.float32)
""" set as standard Gaussian, N(0,I). """
d_mus[0][l], d_logsigmas[0][l] = tf.zeros(
(_b, Z_SIZES[l])), tf.zeros((_b, Z_SIZES[l]))
p_mus[0][l], p_logsigmas[0][l] = tf.zeros(
(_b, Z_SIZES[l])), tf.zeros((_b, Z_SIZES[l]))
self.h_enc, self.e_mus, self.e_logsigmas = h_enc, e_mus, e_logsigmas
self.h_dec, self.d_mus, self.d_logsigmas = h_dec, d_mus, d_logsigmas
self.p_mus, self.p_logsigmas = p_mus, p_logsigmas
self.e_cells, self.e_states = e_cells, e_states
self.d_cells, self.d_states = d_cells, d_states
self.z = [[0] * L] * (T + 1)
###########################################
""" LSTM cells """
###########################################
def lstm_encode(self, state, x, l, is_train):
scope = 'lstm_encode_' + str(l)
x = tf.reshape(x, (_b, -1))
if x.get_shape()[1] != RNN_SIZES[l]:
print(scope, ':', x.get_shape()[1:], '=>', RNN_SIZES[l])
x = self.ls.dense(scope, x, RNN_SIZES[l])
return self.e_cells[l](x, state)
def lstm_decode(self, state, x, l, is_train):
scope = 'lstm_decode_' + str(l)
x = tf.reshape(x, (_b, -1))
if x.get_shape()[1] != RNN_SIZES[l]:
print(scope, ':', x.get_shape()[1:], '=>', RNN_SIZES[l])
x = self.ls.dense(scope, x, RNN_SIZES[l])
return self.d_cells[l](x, state)
###########################################
""" Encoder """
###########################################
def encoder(self, x, t, is_train=True, do_update_bn=True):
for l in range(L):
scope = 'Encode_L' + str(l)
with tf.variable_scope(scope, reuse=self.DO_SHARE):
if l == 0:
x_hat = x - self.canvase_previous(t)
h_dec_lowest_prev = self.h_dec[
t - 1][0] if t == 0 else tf.zeros((_b, RNN_SIZES[0]))
input = self.ii.read(x, x_hat, h_dec_lowest_prev)
else:
input = self.h_enc[t][l - 1]
self.h_enc[t][l], self.e_states[l] = self.lstm_encode(
self.e_states[l], input, l, is_train)
input = self.ls.dense(scope, self.h_enc[t][l], Z_SIZES[l] * 2)
self.z[t][l], self.e_mus[t][l], self.e_logsigmas[t][
l] = self.ls.vae_sampler_w_feature_slice(
input, Z_SIZES[l])
""" classifier """
logit = self.ls.dense('top',
self.h_enc[t][-1],
self.d.l,
activation=tf.nn.elu)
return logit
###########################################
""" Decoder """
###########################################
def decoder(self, t, is_train=True, do_update_bn=True):
for l in range(L - 1, -1, -1):
scope = 'Decoder_L' + str(l)
with tf.variable_scope(scope, reuse=self.DO_SHARE):
if l == L - 1:
input = self.z[t][l]
else:
input = self.concat(self.z[t][l], self.h_dec[t][l + 1], l)
self.h_dec[t][l], self.d_states[l] = self.lstm_decode(
self.d_states[l], input, l, is_train)
""" go out to the input space """
if l == 0:
# [ToDo] replace bellow reconstructor with conv-lstm
if _is_3d:
o = self.canvase_previous(t) + self.ii.write(
self.h_dec[t][l])
#if t == T-1: # for MNIST
o = tf.nn.sigmoid(o)
self.cs[t] = o
else:
self.cs[t] = tf.nn.sigmoid(
self.canvase_previous(t) +
self.ii.write(self.h_dec[t][l]))
return self.cs[t]
""" set prior after building the decoder """
def prior(self, t):
for l in range(L - 1, -1, -1):
scope = 'Piror_L' + str(l)
""" preparation for p_* for t+1 and d_* for t with the output from lstm-decoder"""
if l != 0:
input = self.ls.dense(scope, self.h_dec[t][l],
Z_SIZES[l] * 2 + Z_SIZES[l - 1] * 2)
self.p_mus[t + 1][l], self.p_logsigmas[t + 1][l], self.d_mus[
t][l], self.d_logsigmas[t][l] = self.ls.split(
input, 1, [Z_SIZES[l]] * 2 + [Z_SIZES[l - 1]] * 2)
else:
""" no one uses d_* """
input = self.ls.dense(scope, self.h_dec[t][l], Z_SIZES[l] * 2)
self.p_mus[t +
1][l], self.p_logsigmas[t + 1][l] = self.ls.split(
input, 1, [Z_SIZES[l]] * 2)
""" setting p_mus[0][l] and p_logsigmas[0][l] """
if t == 0:
if l == L - 1:
""" has already been performed at init() """
pass
else:
""" by using only decoder's top-down path as prior since p(z) of t-1 does not exist """
self.p_mus[t][l], self.p_logsigmas[t][l] = self.d_mus[t][
l + 1], tf.exp(self.d_logsigmas[t][l +
1]) # Eq.19 at t=0
else:
if l == L - 1:
""" has already been performed at t-1 """
pass
else:
""" update p(z) of current t """
_, self.p_mus[t][l], self.p_logsigmas[t][
l] = self.ls.precision_weighted_sampler(
scope,
(self.p_mus[t][l], tf.exp(self.p_logsigmas[t][l])),
(self.d_mus[t][l + 1],
tf.exp(self.d_logsigmas[t][l + 1]))) # Eq.19
###########################################
""" Build Graph """
###########################################
def build_graph_train(self, x_l, y_l, x, is_supervised=True):
o = dict() # output
loss = 0
logit_ls = []
""" Build DRAW """
for t in range(T):
logit_ls.append(self.encoder(x, t))
x_reconst = self.decoder(t)
self.prior(t)
if t == 0:
self.DO_SHARE = DO_SHARE = True
self.ii.set_do_share(DO_SHARE)
self.ls.set_do_share(DO_SHARE)
""" p(x|z) Reconstruction Loss """
o['x'] = x
o['cs'] = self.cs
o['Lr'] = self.lf.get_loss_pxz(x_reconst, x, 'DiscretizedLogistic')
loss += o['Lr']
""" VAE KL-Divergence Loss """
o['KL1'], o['KL2'], o['Lz'] = self.lf.get_loss_kl_draw(self)
loss += self.lambda_z_wu * o['Lz']
""" set losses """
o['loss'] = loss
self.o_train = o
""" set optimizer """
optimizer = tf.train.AdamOptimizer(learning_rate=self.lr, beta1=0.5)
grads = optimizer.compute_gradients(loss)
for i, (g, v) in enumerate(grads):
if g is not None:
#g = tf.Print(g, [g], "g %s = "%(v))
grads[i] = (tf.clip_by_norm(g, 5), v) # clip gradients
else:
print('g is None:', v)
v = tf.Print(v, [v], "v = ", summarize=10000)
self.op = optimizer.apply_gradients(grads) # return train_op
def build_graph_test(self, x_l, y_l, is_supervised=False):
o = dict() # output
loss = 0
logit_ls = []
""" Build DRAW """
for t in range(T):
logit_ls.append(
self.encoder(x_l, t, is_train=False, do_update_bn=False))
x_reconst = self.decoder(t)
self.prior(t)
if t == 0:
self.DO_SHARE = DO_SHARE = True
self.ii.set_do_share(DO_SHARE)
self.ls.set_do_share(DO_SHARE)
""" classification loss """
if is_supervised:
o['Ly'], o['accur'] = self.lf.get_loss_pyx(logit_ls[-1], y_l)
loss += o['Ly']
""" for visualizationc """
o['z'], o['y'] = logit_ls[-1], y_l
""" set losses """
o['loss'] = loss
self.o_test = o
###########################################
""" Utilities """
###########################################
def canvase_previous(self, t):
if _is_3d:
c_prev = tf.zeros((_b, _h, _w, _c)) if t == 0 else self.cs[t - 1]
else:
c_prev = tf.zeros((_b, _img_size)) if t == 0 else self.cs[t - 1]
return c_prev
def concat(self, x1, x2, l):
if False: # [ToDo]
x1 = tf.reshape(x1, (_b, IMAGE_SIZES[l][0], IMAGE_SIZES[l][1], -1))
x2 = tf.reshape(x2, (_b, IMAGE_SIZES[l][0], IMAGE_SIZES[l][1], -1))
return tf.concat([x1, x2], 3)
else:
x1 = tf.reshape(x1, (_b, -1))
x2 = tf.reshape(x2, (_b, -1))
return tf.concat([x1, x2], 1)
class ImageInterface(object):
def __init__(self, is_3d, is_read_attention, is_write_attention, read_n, write_n, h, w, c):
""" to manage do_share flag inside Layers object, ImageInterface has Layers as its own property """
self.do_share = False
self.ls = Layers()
self.is_3d = is_3d
self.read_n = read_n
self.write_n = write_n
self.h = h
self.w = w
self.c = c
if is_read_attention:
self.read = self._read_attention
else:
self.read = self._read_no_attention
if is_write_attention:
self.write = self._write_attention
else:
self.write = self._write_no_attention
def set_do_share(self, flag):
self.do_share = flag
self.ls.set_do_share(flag)
###########################
""" READER """
###########################
def _read_no_attention(self, x,x_hat, h_dec):
_h,_w,_c = self.h, self.w, self.c
if self.is_3d:
# x is a raw image and x_hat is an error one, and eash is handled as a different channel,
# so the shape of r and return are [-1, _h,_w,_c*2]
USE_CONV_READ = False # 170720
if USE_CONV_READ:
scope = 'read_1'
x = self.ls.conv2d(scope+'_1', x, 64, activation=tf.nn.elu)
x = self.ls.max_pool(x)
x = self.ls.conv2d(scope+'_2', x, 64, activation=tf.nn.elu)
x = self.ls.max_pool(x)
x = self.ls.conv2d(scope+'_3', x, 64, activation=tf.nn.elu)
scope = 'read_hat_1'
x_hat = self.ls.conv2d(scope+'_1', x_hat, 16, activation=tf.nn.elu)
x_hat = self.ls.max_pool(x_hat)
x_hat = self.ls.conv2d(scope+'_2', x_hat, 16, activation=tf.nn.elu)
x_hat = self.ls.max_pool(x_hat)
x_hat = self.ls.conv2d(scope+'_3', x_hat, 16, activation=tf.nn.elu)
r = tf.concat([x,x_hat], 3)
h_dec = tf.reshape( self.ls.dense(scope, h_dec, _h*_w*_c), [-1, int(_h/4), int(_w/4),_c*4*4])
return tf.concat([r,h_dec], 3)
elif False:
scope = 'read_1'
x = self.ls.conv2d(scope+'_1', x, 128, activation=tf.nn.elu)
x = self.ls.conv2d(scope+'_2', x, 128, activation=tf.nn.elu)
x = self.ls.conv2d(scope+'_3', x, 128, activation=tf.nn.elu)
x = self.ls.max_pool(x)
scope = 'read_2'
x = self.ls.conv2d(scope+'_1', x, 256, activation=tf.nn.elu)
x = self.ls.conv2d(scope+'_2', x, 256, activation=tf.nn.elu)
x = self.ls.conv2d(scope+'_3', x, 256, activation=tf.nn.elu)
x = self.ls.max_pool(x)
scope = 'read_3'
x = self.ls.conv2d(scope+'_1', x, 512, activation=tf.nn.elu)
x = self.ls.conv2d(scope+'_2', x, 256, activation=tf.nn.elu, filter_size=(1,1))
x = self.ls.conv2d(scope+'_3', x, 128, activation=tf.nn.elu, filter_size=(1,1))
x = self.ls.conv2d(scope+'_4', x, 64, activation=tf.nn.elu, filter_size=(1,1))
scope = 'read_hat_1'
x_hat = self.ls.conv2d(scope+'_1', x_hat, 128, activation=tf.nn.elu)
x_hat = self.ls.max_pool(x_hat)
scope = 'read_hat_2'
x_hat = self.ls.conv2d(scope+'_1', x_hat, 256, activation=tf.nn.elu)
x_hat = self.ls.max_pool(x_hat)
scope = 'read_hat_3'
x_hat = self.ls.conv2d(scope+'_4', x_hat, 16, activation=tf.nn.elu, filter_size=(1,1))
r = tf.concat([x,x_hat], 3)
h_dec = tf.reshape( self.ls.dense(scope, h_dec, _h*_w*_c), [-1, int(_h/4), int(_w/4),_c*4*4])
return tf.concat([r,h_dec], 3)
else:
r = tf.concat([x,x_hat], 3)
USE_DEC_LOWEST_PREV = True
if USE_DEC_LOWEST_PREV:
# use decoder feedback as element-wise adding
# Eq.(21) in [Gregor, 2016]
scope = 'read'
USE_CONV = True
if USE_CONV:
h_dec = tf.reshape( self.ls.dense(scope, h_dec, _h*_w*_c), [-1, _h,_w,_c])
h_dec = self.ls.conv2d("conv", h_dec, _c*2, activation=tf.nn.elu)
return r + h_dec
else:
h_dec = tf.reshape( self.ls.dense(scope, h_dec, _h*_w*_c*2), [-1, _h,_w,_c*2])
return r + h_dec
else:
return r
else:
return tf.concat([x,x_hat], 1)
def _read_attention( self, x, x_hat, h_dec ):
_h,_w,_c = self.h, self.w, self.c
N = self.read_n
if self.is_3d:
Fx,Fy,gamma = self._set_window("read", h_dec,N)
# Fx is (?, 5, 32, 3)
# gamma is (?, 3)
def filter_img(img,Fx,Fy,gamma, N):
# Fx and Fy are (?, 5, 32, 3)
Fxt = tf.transpose(Fx,perm=[0,3,2,1])
Fy = tf.transpose(Fy,perm=[0,3,2,1])
# img.get_shape() has already been (?, 32, 32, 3)
img = tf.transpose(img, perm=[0,3,2,1])
# tf.matmul(img,Fxt) is (?, 3, 32, 5)
img_Fxt = tf.matmul(img,Fxt)
img_Fxt = tf.transpose(img_Fxt, perm=[0,1,3,2])
# Fy: (?, 3, 32, 5)
Fy = tf.transpose(Fy,perm=[0,1,3,2])
glimpse = tf.matmul(Fy, img_Fxt, transpose_b=True)
# glimpse.get_shape() is (?, 3, 32, 32)
glimpse = tf.transpose(glimpse, perm=[0,2,3,1])
glimpse = tf.reshape(glimpse,[-1,N*N, _c])
glimpse = tf.transpose(glimpse, perm=[0,2,1])
gamma = tf.reshape(gamma,[-1,1, _c])
gamma = tf.transpose(gamma, perm=[0,2,1])
o = glimpse*gamma
o = tf.transpose(o, perm=[0,2,1])
return o
x = filter_img( x, Fx, Fy, gamma, N) # batch x (read_n*read_n)
x_hat = filter_img( x_hat, Fx, Fy, gamma, N)
x = tf.reshape(x, [-1, N,N,_c])
x_hat = tf.reshape(x_hat, [-1, N,N,_c])
return tf.concat([x,x_hat], 3)
else:
Fx,Fy,gamma = self._set_window("read", h_dec,N)
# Fx: (?, 5, 32), gamma: (?, 1)
def filter_img(img,Fx,Fy,gamma,N):
#print('filter_img in is_image == False')
Fxt = tf.transpose(Fx,perm=[0,2,1])
img = tf.reshape(img,[-1,_w,_h])
# Fxt : (?, 32, 5)
# img : (?, 32, 32)
glimpse = tf.matmul(Fy,tf.matmul(img,Fxt))
glimpse = tf.reshape(glimpse,[-1,N*N])
return glimpse*tf.reshape(gamma,[-1,1])
x = filter_img( x, Fx, Fy, gamma, N) # batch x (read_n*read_n)
x_hat = filter_img( x_hat, Fx, Fy, gamma, N)
return tf.concat([x,x_hat], 1) # concat along feature axis
###########################
""" WRITER """
###########################
def _write_no_attention(self, h):
scope = "write"
_h,_w,_c = self.h, self.w, self.c
if self.is_3d:
IS_SIMPLE_WRITE = True
if IS_SIMPLE_WRITE :
print('IS_SIMPLE_WRITE:', IS_SIMPLE_WRITE)
return tf.reshape( self.ls.dense(scope, h, _h*_w*_c, tf.nn.elu), [-1, _h, _w, _c])
else:
IS_CONV_LSTM = True
if IS_CONV_LSTM :
raise NotImplementedError
else:
activation = tf.nn.elu
print('h in write:', h) # h.shape is (_b, RNN_SIZES[0])
L = 1
h = tf.reshape( h, (-1, 2,2,64*3)) # should match to RNN_SIZES[0]
h = self.ls.deconv2d(scope+'_1', h, 64*2) # 4
h = activation(h)
L = 2
h = self.ls.deconv2d(scope+'_2', h, 16*3) # 8
h = activation(h)
h = PS(h, 4, color=True)
print('h in write:', h)
return tf.reshape( h, [-1, _h, _w, _c])
else:
return self.ls.dense( scope,h, _h*_w*_c )
def _write_attention(self, h_dec):
scope = "writeW"
N = self.write_n
write_size = N*N
_h,_w,_c = self.h, self.w, self.c
Fx, Fy, gamma = self._set_window("write", h_dec, N)
if self.is_3d:
# Fx and Fy are (?, 5, 32, 3), gamma is (?, 3)
w = self.ls.dense( scope, h_dec, write_size*_c) # batch x (write_n*write_n) [ToDo] replace self.ls.dense with deconv
w = tf.reshape(w,[tf.shape(h_dec)[0],N,N,_c])
w = tf.transpose(w, perm=[0,3,1,2])
Fyt = tf.transpose(Fx,perm=[0,3,2,1])
Fx = tf.transpose(Fx, perm=[0,3,1,2])
w_Fx = tf.matmul(w, Fx)
# w_Fx.get_shape() is (?, 3, 5, 32)
w_Fx = tf.transpose(w_Fx, perm=[0,1,3,2])
wr = tf.matmul(Fyt, w_Fx, transpose_b=True)
wr = tf.reshape(wr,[tf.shape(h_dec)[0],_w*_h, _c])
wr = tf.transpose(wr, perm=[0,2,1])
inv_gamma = tf.reshape(1.0/gamma,[-1,1, _c])
inv_gamma = tf.transpose(inv_gamma, perm=[0,2,1])
o = wr*inv_gamma
o = tf.transpose(o, perm=[0,2,1])
o = tf.reshape(o, [tf.shape(h_dec)[0], _w, _h, _c])
return o
else:
w = self.ls.dense( scope, h_dec,write_size) # batch x (write_n*write_n)
w = tf.reshape(w,[tf.shape(h_dec)[0],N,N])
Fyt = tf.transpose(Fy,perm=[0,2,1])
wr = tf.matmul(Fyt,tf.matmul(w,Fx))
wr = tf.reshape(wr,[tf.shape(h_dec)[0],_w*_h])
return wr*tf.reshape(1.0/gamma,[-1,1])
###########################
""" Filter Functions """
###########################
def _filterbank(self, gx, gy, sigma2,delta, N):
if self.is_3d:
_h,_w,_c = self.h, self.w, self.c
# gx and delta are (?,3)
grid_i = tf.reshape(tf.cast(tf.range(N*_c), tf.float32), [1, -1, _c])
mu_x = gx + (grid_i - N / 2 - 0.5) * delta # eq 19
mu_y = gy + (grid_i - N / 2 - 0.5) * delta # eq 20
# shape : [1, N, _c]
w = tf.reshape( tf.cast( tf.range(_w*_c), tf.float32), [1, 1, -1, _c])
h = tf.reshape( tf.cast( tf.range(_h*_c), tf.float32), [1, 1, -1, _c])
mu_x = tf.reshape(mu_x, [-1, N, 1, _c])
mu_y = tf.reshape(mu_y, [-1, N, 1, _c])
sigma2 = tf.reshape(sigma2, [-1, 1, 1, _c])
Fx = tf.exp(-tf.square((w - mu_x) / (2*sigma2))) # 2*sigma2?
Fy = tf.exp(-tf.square((h - mu_y) / (2*sigma2))) # batch x N x B
# normalize, sum over A and B dims
Fx=Fx/tf.maximum(tf.reduce_sum(Fx,2,keep_dims=True),eps)
Fy=Fy/tf.maximum(tf.reduce_sum(Fy,2,keep_dims=True),eps)
return Fx,Fy
else:
grid_i = tf.reshape(tf.cast(tf.range(N), tf.float32), [1, -1])
# gx, delta and mu_x are (?, 1), and grid_i is (1, 5))
mu_x = gx + (grid_i - N / 2 - 0.5) * delta # eq 19
mu_y = gy + (grid_i - N / 2 - 0.5) * delta # eq 20
h = tf.reshape(tf.cast(tf.range(_h), tf.float32), [1, 1, -1])
w = tf.reshape(tf.cast(tf.range(_w), tf.float32), [1, 1, -1])
mu_x = tf.reshape(mu_x, [-1, N, 1])
mu_y = tf.reshape(mu_y, [-1, N, 1])
sigma2 = tf.reshape(sigma2, [-1, 1, 1])
Fx = tf.exp(-tf.square((w - mu_x) / (2*sigma2))) # 2*sigma2?
Fy = tf.exp(-tf.square((h - mu_y) / (2*sigma2))) # batch x N x B
# normalize, sum over A and B dims
Fx=Fx/tf.maximum(tf.reduce_sum(Fx,2,keep_dims=True),eps)
Fy=Fy/tf.maximum(tf.reduce_sum(Fy,2,keep_dims=True),eps)
return Fx,Fy
def _set_window(self, scope, h_dec,N):
if self.is_3d:
_h,_w,_c = self.h, self.w, self.c
# get five (BATCH_SIZE, _c) matrixes
gx_, gy_, log_sigma2, log_delta, log_gamma = self.ls.split( self.ls.dense(scope, h_dec, _c*5), 1, [_c]*5)
gx_ = tf.reshape(gx_, [-1,1,_c])
gy_ = tf.reshape(gy_, [-1,1,_c])
log_sigma2 = tf.reshape(log_sigma2, [-1,1,_c])
log_delta = tf.reshape(log_delta, [-1,1,_c])
log_gamma = tf.reshape(log_gamma, [-1,1,_c])
gx = (_w + 1)/2*(gx_+1)
gy = (_h + 1)/2*(gy_+1)
sigma2 = tf.exp(log_sigma2)
delta = ( max(_h, _w) -1 ) / ( N -1 ) * tf.exp( log_delta ) # batch x N
return self._filterbank( gx, gy, sigma2, delta, N) + ( tf.exp(log_gamma),)
else:
params = self.ls.dense(scope, h_dec,5)
gx_,gy_,log_sigma2,log_delta,log_gamma=tf.split(value=params, num_or_size_splits=5, axis=1)
gx=(_w + 1)/2*(gx_+1)
gy=(_h + 1)/2*(gy_+1)
sigma2=tf.exp(log_sigma2)
delta=(max(_h, _w)-1)/(N-1)*tf.exp(log_delta) # batch x N
return self._filterbank(gx,gy,sigma2,delta,N)+(tf.exp(log_gamma),)