def predictor(x_, o_dim_, o_type_, num_layers_=1, h_dim_=100, activation_fn=tf.nn.relu, keep_prob_=1.0, w_reg_=None):
'''
INPUT
x_ : (2D-tensor) input
o_dim_ : (int) output dimension
o_type_ : (string) output type one of {'continuous', 'categorical', 'binary'}
num_layers_ : (int) # of hidden layers
activation_fn_: tf activation functions
OUTPUT
o_type_ tensor
'''
if o_type_ == 'continuous':
out_fn = None
elif o_type_ == 'categorical':
out_fn = tf.nn.softmax #for classification task
elif o_type_ == 'binary':
out_fn = tf.nn.sigmoid
else:
raise ValueError('Wrong output type. The value {}!!'.format(o_type_))
if num_layers_ == 1:
out = FC_Net(inputs=x_, num_outputs=o_dim_, activation_fn=out_fn, weights_regularizer=w_reg_, scope='out')
else: #num_layers > 1
for tmp_layer in range(num_layers_-1):
if tmp_layer == 0:
net = x_
net = FC_Net(inputs=net, num_outputs=h_dim_, activation_fn=activation_fn, weights_regularizer=w_reg_, scope='layer_'+str(tmp_layer))
net = tf.nn.dropout(net, keep_prob=keep_prob_)
out = FC_Net(inputs=net, num_outputs=o_dim_, activation_fn=out_fn, weights_regularizer=w_reg_, scope='out')
return out
def _build_net(self):
with tf.variable_scope(self.name, reuse=tf.AUTO_REUSE):
## Placeholder
self.mb_size = tf.placeholder(tf.int32, [], name='batch_size') #Batch Size
self.lr_rate = tf.placeholder(tf.float32, [], name='learning_rate') #Learning Rate
self.keep_prob = tf.placeholder(tf.float32, [], name='keep_probability') #keeping rate: 1- dropout rate
self.x = tf.placeholder(tf.float32, shape=[None, self.x_dim], name='inputs') #Covariates
self.k = tf.placeholder(tf.float32, shape=[None, 1], name='labels') #Event/censoring label (censoring:0)
self.t = tf.placeholder(tf.float32, shape=[None, 1], name='timetoevents') #Time until event to occur
self.y1 = tf.placeholder(tf.float32, shape=[None, self.num_evalTime], name='pseudo1') #Pseudo values for CIF for cause 1
self.y2 = tf.placeholder(tf.float32, shape=[None, self.num_evalTime], name='pseudo2')#pseudo values for CIF for cause 2
## Get output from shared network
shared_out = util_net.create_FCNet(self.x, self.num_layers_shared, self.num_units_shared, self.activation_fn, self.num_units_shared, self.activation_fn, self.initial_W, self.keep_prob, self.reg_W)
## Get output for cause 1 from cause-specific network feeding output from shared network as input
cs_out1= util_net.create_FCNet(shared_out, self.num_layers_CS, self.num_units_shared, self.activation_fn, self.num_units_CS, self.activation_fn, self.initial_W, self.keep_prob, self.reg_W)
self.out1= FC_Net(cs_out1, self.num_evalTime, activation_fn=tf.nn.selu,
weights_initializer=self.initial_W, weights_regularizer=self.reg_W_out, scope="Output1")
## Get output for cause 2 from cause-specific network feeding output from shared network as input
cs_out2= util_net.create_FCNet(shared_out, self.num_layers_CS, self.num_units_shared, self.activation_fn, self.num_units_CS, self.activation_fn, self.initial_W, self.keep_prob, self.reg_W)
self.out2= FC_Net(cs_out2, self.num_evalTime, activation_fn=tf.nn.selu,
weights_initializer=self.initial_W, weights_regularizer=self.reg_W_out, scope="Output2")
## Stack the outputs of cause 1 and cause 2 of the event
out = tf.stack((self.out1, self.out2), axis=1)
## Reshape outputs
self.output = tf.reshape(out, [-1, self.num_Event, self.num_evalTime])
## Get loss function
self.loss_mse_1()
self.loss_mse_2()
## Optimization
self.LOSS_TOTAL = self.LOSS1 + self.LOSS2
self.solver = tf.train.AdamOptimizer(learning_rate=self.lr_rate).minimize(self.LOSS_TOTAL)
def stochastic_encoder(x_, o_dim_, num_layers_=1, h_dim_=100, activation_fn=tf.nn.relu, keep_prob_=1.0, w_reg_=None):
'''
INPUT
x_ : (2D-tensor) input
o_dim_ : (int) output dimension
num_layers_ : (int) # of hidden layers
activation_fn_: tf activation functions
OUTPUT
[mu,sigma] tensor
'''
if num_layers_ == 1:
out = FC_Net(inputs=x_, num_outputs=o_dim_, activation_fn=None, weights_regularizer=w_reg_, scope='out')
else: #num_layers > 1
for tmp_layer in range(num_layers_-1):
if tmp_layer == 0:
net = x_
net = FC_Net(inputs=net, num_outputs=h_dim_, activation_fn=activation_fn, weights_regularizer=w_reg_, scope='layer_'+str(tmp_layer))
net = tf.nn.dropout(net, keep_prob=keep_prob_)
out = FC_Net(inputs=net, num_outputs=o_dim_, activation_fn=None, weights_regularizer=w_reg_, scope='out')
return out
def create_FCNet(inputs, num_layers, h_dim, h_fn, o_dim, o_fn, w_init, keep_prob, regularizer=None):
'''
GOAL : Create FC network with different specifications
inputs (tensor) : input tensor
num_layers : number of layers in FCNet
h_dim (int) : number of hidden units
h_fn : activation function for hidden layers (default: tf.nn.relu)
o_dim (int) : number of output units
o_fn : activation function for output layers (defalut: None)
w_init : initialization for weight matrix (defalut: Xavier)
keep_prob : keep probabilty [0, 1] (if None, dropout is not employed)
'''
# default active functions (hidden: relu, out: None)
if h_fn is None:
h_fn = tf.nn.relu
if o_fn is None:
o_fn = None
# default initialization functions (weight: Xavier, bias: None)
if w_init is None:
w_init = tf.contrib.layers.xavier_initializer() # Xavier initialization
for layer in range(num_layers):
if num_layers == 1:
out = FC_Net(inputs, o_dim, activation_fn=o_fn, weights_initializer=w_init, weights_regularizer=regularizer, biases_regularizer=regularizer)
else:
if layer == 0:
h = FC_Net(inputs, h_dim, activation_fn=h_fn, weights_initializer=w_init, weights_regularizer=regularizer, biases_regularizer=regularizer)
if not keep_prob is None:
h = tf.nn.dropout(h, keep_prob=keep_prob)
elif layer > 0 and layer != (num_layers-1): # layer > 0:
h = FC_Net(h, h_dim, activation_fn=h_fn, weights_initializer=w_init, weights_regularizer=regularizer, biases_regularizer=regularizer)
if not keep_prob is None:
h = tf.nn.dropout(h, keep_prob=keep_prob)
else: # layer == num_layers-1 (the last layer)
out = FC_Net(h, o_dim, activation_fn=o_fn, weights_initializer=w_init, weights_regularizer=regularizer, biases_regularizer=regularizer)
return out
def _build_net(self):
with tf.variable_scope(self.name, reuse=tf.AUTO_REUSE):
## Placeholder
self.mb_size = tf.placeholder(tf.int32, [],
name='batch_size') #Batch Size
self.lr_rate = tf.placeholder(tf.float32, [],
name='learning_rate') #Learning Rate
self.keep_prob = tf.placeholder(
tf.float32, [],
name='keep_probability') #Keeping rate: 1- dropout rate
self.x = tf.placeholder(tf.float32,
shape=[None, self.x_dim],
name='inputs') #Covariates
self.k = tf.placeholder(
tf.float32, shape=[None, 1],
name='labels') #Event/censoring label (censoring:0)
self.t = tf.placeholder(
tf.float32, shape=[None, 1],
name='timetoevents') #Time until event to occur
self.y = tf.placeholder(
tf.float32,
shape=[None, self.num_Event, self.num_evalTime],
name='pseudo') #Pseudo values for CIF
## Get output from final hidden layer
out_fc = util_net.create_FCNet(self.x, self.num_layers,
self.num_units, self.activation_fn,
self.num_units, self.activation_fn,
self.initial_W, self.keep_prob,
self.reg_W)
## Output Layer (Use output of final hidden layer as Input)
out = FC_Net(out_fc,
self.num_Event * self.num_evalTime,
activation_fn=tf.nn.selu,
weights_initializer=self.initial_W,
weights_regularizer=self.reg_W_out,
scope="Output")
## Reshape outputs
self.output = tf.reshape(out,
[-1, self.num_Event, self.num_evalTime])
## Get loss function
self.loss_mse()
## Optimization
self.solver = tf.train.AdamOptimizer(
learning_rate=self.lr_rate).minimize(self.LOSS)
def _build_net(self):
with tf.variable_scope(self.name):
#### PLACEHOLDER DECLARATION
self.mb_size = tf.placeholder(tf.int32, [], name='batch_size')
self.lr_rate = tf.placeholder(tf.float32, [], name='learning_rate')
self.keep_prob = tf.placeholder(
tf.float32, [], name='keep_probability') #keeping rate
self.a = tf.placeholder(tf.float32, [], name='alpha')
self.b = tf.placeholder(tf.float32, [], name='beta')
self.c = tf.placeholder(tf.float32, [], name='gamma')
self.x = tf.placeholder(tf.float32,
shape=[None, self.x_dim],
name='inputs')
self.k = tf.placeholder(
tf.float32, shape=[None, 1],
name='labels') #event/censoring label (censoring:0)
self.t = tf.placeholder(tf.float32,
shape=[None, 1],
name='timetoevents')
self.fc_mask1 = tf.placeholder(
tf.float32,
shape=[None, self.num_Event, self.num_Category],
name='mask1') #for Loss 1
self.fc_mask2 = tf.placeholder(tf.float32,
shape=[None, self.num_Category],
name='mask2') #for Loss 2 / Loss 3
##### SHARED SUBNETWORK w/ FCNETS
shared_out = utils.create_FCNet(self.x, self.num_layers_shared,
self.h_dim_shared, self.active_fn,
self.h_dim_shared, self.active_fn,
self.initial_W, self.keep_prob,
self.reg_W)
last_x = self.x #for residual connection
h = tf.concat([last_x, shared_out], axis=1)
#(num_layers_CS) layers for cause-specific (num_Event subNets)
out = []
for _ in range(self.num_Event):
cs_out = utils.create_FCNet(h, (self.num_layers_CS),
self.h_dim_CS, self.active_fn,
self.h_dim_CS, self.active_fn,
self.initial_W, self.keep_prob,
self.reg_W)
out.append(cs_out)
out = tf.stack(out, axis=1) # stack referenced on subject
out = tf.reshape(out, [-1, self.num_Event * self.h_dim_CS])
out = tf.nn.dropout(out, keep_prob=self.keep_prob)
out = FC_Net(out,
self.num_Event * self.num_Category,
activation_fn=tf.nn.softmax,
weights_initializer=self.initial_W,
weights_regularizer=self.reg_W_out,
scope="Output")
self.out = tf.reshape(out, [-1, self.num_Event, self.num_Category])
##### GET LOSS FUNCTIONS
self.loss_Log_Likelihood() #get loss1: Log-Likelihood loss
self.loss_Ranking() #get loss2: Ranking loss
self.loss_Calibration() #get loss3: Calibration loss
self.LOSS_TOTAL = self.a * self.LOSS_1 + self.b * self.LOSS_2 + self.c * self.LOSS_3
self.solver = tf.train.AdamOptimizer(
learning_rate=self.lr_rate).minimize(self.LOSS_TOTAL)
def _build_net(self):
with tf.variable_scope(self.name):
#### PLACEHOLDER DECLARATION
self.lr_rate = tf.placeholder(tf.float32)
self.keep_prob = tf.placeholder(tf.float32) #keeping rate
self.a = tf.placeholder(tf.float32)
self.b = tf.placeholder(tf.float32)
self.c = tf.placeholder(tf.float32, shape=[self.num_Event])
self.sigma1 = tf.placeholder(tf.float32) # sigma hyperparameter
self.x = tf.placeholder(tf.float32, shape=[None, self.x_dim])
self.k = tf.placeholder(
tf.float32, shape=[None,
1]) #event/censoring label (censoring:0)
self.t = tf.placeholder(tf.float32, shape=[None, 1])
self.fc_mask1 = tf.placeholder(
tf.float32, shape=[None, self.num_Event,
self.num_Category]) #for Loss 1
self.fc_mask2 = tf.placeholder(tf.float32,
shape=[None, self.num_Category
]) #for Loss 2
##### SHARED SUBNETWORK w/ FCNETS
n_inputs = self.x_dim_lst[0]
if self.version == "standard":
shared_inputs = self.x[:, 0:n_inputs]
shared_out = utils.create_FCNet(shared_inputs,
int(self.num_layers_shared),
int(self.h_dim_shared),
self.active_fn,
int(self.h_dim_shared),
self.active_fn, self.initial_W,
self.keep_prob)
elif self.version == "sparse":
shared_o2o_weights = tf.Variable(self.initial_W([n_inputs]),
name="shared_o2o_weights")
shared_inputs = tf.multiply(self.x[:, 0:n_inputs],
shared_o2o_weights)
shared_o2o_regularizer = tf.contrib.layers.l1_regularizer(
scale=tf.reduce_mean(self.c), scope=None)
tf.contrib.layers.apply_regularization(
shared_o2o_regularizer, weights_list=[shared_o2o_weights])
shared_out = utils.create_FCNet(shared_inputs,
int(self.num_layers_shared),
int(self.h_dim_shared),
self.active_fn,
int(self.h_dim_shared),
self.active_fn, self.initial_W,
self.keep_prob)
elif self.version == "attentive":
att_shared_inputs = self.x[:, 0:n_inputs]
att_output_dim = sum(self.x_dim_lst[1:])
att_out = utils.create_FCNet(att_shared_inputs,
int(self.num_layers_shared),
att_output_dim, self.active_fn,
att_output_dim, None,
self.initial_W, self.keep_prob)
att_out = tf.reshape(att_out, [-1, self.num_Event, n_inputs])
self.att_out = tf.nn.softmax(att_out, axis=-1)
# num_layers_FC layers for cause-specific subnetwork
out = []
for _event in range(self.num_Event):
start = sum(self.x_dim_lst[0:(_event + 1)])
end = sum(self.x_dim_lst[0:(_event + 2)])
important_x = self.x[:, start:end] #for residual connection
if self.version == "standard":
inputs = tf.concat([important_x, shared_out], axis=1)
n_inputs_event = self.x_dim_lst[_event +
1] + self.h_dim_shared
cs_out = utils.create_FCNet(
inputs, int(self.num_layers_FC[_event]),
int(self.h_dim_FC[_event]), self.active_fn,
int(self.h_dim_FC[_event]), self.active_fn,
self.initial_W, self.keep_prob)
elif self.version == "sparse":
inputs = tf.concat([important_x, shared_out], axis=1)
n_inputs_event = self.x_dim_lst[_event +
1] + self.h_dim_shared
specific_o2o_weights = tf.Variable(
self.initial_W([int(n_inputs_event)]),
name="specific_o2o_weights_" + str(_event + 1))
specific_inputs = tf.multiply(inputs, specific_o2o_weights)
specific_o2o_regularizer = tf.contrib.layers.l1_regularizer(
scale=self.c[_event], scope=None)
tf.contrib.layers.apply_regularization(
specific_o2o_regularizer,
weights_list=[specific_o2o_weights])
cs_out = utils.create_FCNet(
specific_inputs, int(self.num_layers_FC[_event]),
int(self.h_dim_FC[_event]), self.active_fn,
int(self.h_dim_FC[_event]), self.active_fn,
self.initial_W, self.keep_prob)
elif self.version == "attentive":
att_inputs = tf.multiply(important_x,
self.att_out[:, _event, :])
regularizer = tf.contrib.layers.l2_regularizer(
scale=self.c[_event], scope=None)
cs_out = utils.create_FCNet(
att_inputs,
int(self.num_layers_FC[_event]),
int(self.h_dim_FC[_event]),
self.active_fn,
int(self.h_dim_FC[_event]),
self.active_fn,
self.initial_W,
self.keep_prob,
regularizer=regularizer)
out.append(cs_out)
# out = tf.stack(out, axis=1) # stack referenced on subject
# out = tf.reshape(out, [-1, sum(self.h_dim_FC)])
out = tf.concat(out, axis=1)
out = tf.nn.dropout(out, keep_prob=self.keep_prob)
if self.version in ["standard", "sparse"]:
out = FC_Net(out,
self.num_Event * self.num_Category,
activation_fn=tf.nn.softmax,
weights_initializer=self.initial_W,
scope="Output")
elif self.version == "attentive":
regularizer = tf.contrib.layers.l2_regularizer(
scale=tf.reduce_mean(self.c), scope=None)
out = FC_Net(out,
self.num_Event * self.num_Category,
activation_fn=tf.nn.softmax,
weights_initializer=self.initial_W,
scope="Output",
weights_regularizer=regularizer,
biases_regularizer=regularizer)
self.out = tf.reshape(out, [-1, self.num_Event, self.num_Category])
##### GET LOSS FUNCTIONS
self.loss_Log_Likelihood() #get loss1: Log-Likelihood loss
self.loss_Ranking() #get loss2: Ranking loss
self.LOSS_TOTAL = self.a * self.LOSS_1 + self.b * self.LOSS_2 + tf.losses.get_regularization_loss(
)
self.solver = tf.train.AdamOptimizer(
learning_rate=self.lr_rate).minimize(self.LOSS_TOTAL)
def _build_net(self):
with tf.variable_scope(self.name):
#### PLACEHOLDER DECLARATION
self.mb_size = tf.placeholder(tf.int32, [], name='batch_size')
self.lr_rate = tf.placeholder(tf.float32)
self.keep_prob = tf.placeholder(tf.float32) #keeping rate
self.a = tf.placeholder(tf.float32)
self.b = tf.placeholder(tf.float32)
self.c = tf.placeholder(tf.float32)
self.x = tf.placeholder(tf.float32,
shape=[None, self.max_length, self.x_dim])
self.x_mi = tf.placeholder(
tf.float32, shape=[None, self.max_length, self.x_dim]
) #this is the missing indicator (including for cont. & binary) (includes delta)
self.k = tf.placeholder(
tf.float32, shape=[None,
1]) #event/censoring label (censoring:0)
self.t = tf.placeholder(tf.float32, shape=[None, 1])
self.fc_mask1 = tf.placeholder(
tf.float32, shape=[None, self.num_Event,
self.num_Category]) #for denominator
self.fc_mask2 = tf.placeholder(
tf.float32, shape=[None, self.num_Event,
self.num_Category]) #for Loss 1
self.fc_mask3 = tf.placeholder(tf.float32,
shape=[None, self.num_Category
]) #for Loss 2
seq_length = get_seq_length(self.x)
tmp_range = tf.expand_dims(tf.range(0, self.max_length, 1), axis=0)
self.rnn_mask1 = tf.cast(
tf.less_equal(tmp_range, tf.expand_dims(seq_length - 1,
axis=1)), tf.float32)
self.rnn_mask2 = tf.cast(
tf.equal(tmp_range, tf.expand_dims(seq_length - 1, axis=1)),
tf.float32)
### DEFINE LOOP FUNCTION FOR RAW_RNN w/ TEMPORAL ATTENTION
def loop_fn_att(time, cell_output, cell_state, loop_state):
emit_output = cell_output
if cell_output is None: # time == 0
next_cell_state = cell.zero_state(self.mb_size, tf.float32)
next_loop_state = loop_state_ta
else:
next_cell_state = cell_state
tmp_h = utils.create_concat_state(next_cell_state,
self.num_layers_RNN,
self.RNN_type)
e = utils.create_FCNet(tf.concat([tmp_h, all_last],
axis=1),
self.num_layers_ATT,
self.h_dim2,
tf.nn.tanh,
1,
None,
self.initial_W,
keep_prob=self.keep_prob)
e = tf.exp(e)
next_loop_state = (
loop_state[0].write(time - 1,
e), # save att power (e_{j})
loop_state[1].write(time - 1, tmp_h)
) # save all the hidden states
# elements_finished = (time >= seq_length)
elements_finished = (time >= self.max_length - 1)
#this gives the break-point (no more recurrence after the max_length)
finished = tf.reduce_all(elements_finished)
next_input = tf.cond(
finished,
lambda: tf.zeros([self.mb_size, 2 * self.x_dim],
dtype=tf.float32), # [x_hist, mi_hist]
lambda: inputs_ta.read(time))
return (elements_finished, next_input, next_cell_state,
emit_output, next_loop_state)
# divide into the last x and previous x's
x_last = tf.slice(self.x, [0, (self.max_length - 1), 1],
[-1, -1, -1]) #current measurement
x_last = tf.reshape(x_last,
[-1, (self.x_dim_cont + self.x_dim_bin)
]) #remove the delta of the last measurement
x_last = tf.reduce_sum(
tf.tile(tf.expand_dims(self.rnn_mask2, axis=2),
[1, 1, self.x_dim]) * self.x,
reduction_indices=1
) #sum over time since all others time stamps are 0
x_last = tf.slice(
x_last, [0, 1],
[-1, -1]) #remove the delta of the last measurement
x_hist = self.x * (
1. - tf.tile(tf.expand_dims(self.rnn_mask2, axis=2),
[1, 1, self.x_dim])
) #since all others time stamps are 0 and measurements are 0-padded
x_hist = tf.slice(x_hist, [0, 0, 0],
[-1, (self.max_length - 1), -1])
# do same thing for missing indicator
mi_last = tf.slice(self.x_mi, [0, (self.max_length - 1), 1],
[-1, -1, -1]) #current measurement
mi_last = tf.reshape(mi_last,
[-1, (self.x_dim_cont + self.x_dim_bin)
]) #remove the delta of the last measurement
mi_last = tf.reduce_sum(
tf.tile(tf.expand_dims(self.rnn_mask2, axis=2),
[1, 1, self.x_dim]) * self.x_mi,
reduction_indices=1
) #sum over time since all others time stamps are 0
mi_last = tf.slice(
mi_last, [0, 1],
[-1, -1]) #remove the delta of the last measurement
mi_hist = self.x_mi * (
1. - tf.tile(tf.expand_dims(self.rnn_mask2, axis=2),
[1, 1, self.x_dim])
) #since all others time stamps are 0 and measurements are 0-padded
mi_hist = tf.slice(mi_hist, [0, 0, 0],
[-1, (self.max_length - 1), -1])
all_hist = tf.concat([x_hist, mi_hist], axis=2)
all_last = tf.concat([x_last, mi_last], axis=1)
#extract inputs for the temporal attention: mask (to incorporate only the measured time) and x_{M}
seq_length = get_seq_length(x_hist)
rnn_mask_att = tf.cast(
tf.not_equal(tf.reduce_sum(x_hist, reduction_indices=2), 0),
dtype=tf.float32
) #[mb_size, max_length-1], 1:measurements 0:no measurements
##### SHARED SUBNETWORK: RNN w/ TEMPORAL ATTENTION
#change the input tensor to TensorArray format with [max_length, mb_size, x_dim]
inputs_ta = tf.TensorArray(dtype=tf.float32,
size=self.max_length - 1).unstack(
_transpose_batch_time(all_hist),
name='Shared_Input')
#create a cell with RNN hyper-parameters (RNN types, #layers, #nodes, activation functions, keep proability)
cell = utils.create_rnn_cell(self.h_dim1, self.num_layers_RNN,
self.keep_prob, self.RNN_type,
self.RNN_active_fn)
#define the loop_state TensorArray for information from rnn time steps
loop_state_ta = (
tf.TensorArray(size=self.max_length - 1,
dtype=tf.float32), #e values (e_{j})
tf.TensorArray(size=self.max_length - 1,
dtype=tf.float32)) #hidden states (h_{j})
rnn_outputs_ta, self.rnn_final_state, loop_state_ta = tf.nn.raw_rnn(
cell, loop_fn_att)
#rnn_outputs_ta : TensorArray
#rnn_final_state : Tensor
#rnn_states_ta : (TensorArray, TensorArray)
rnn_outputs = _transpose_batch_time(rnn_outputs_ta.stack())
# rnn_outputs = tf.reshape(rnn_outputs, [-1, self.max_length-1, self.h_dim1])
rnn_states = _transpose_batch_time(loop_state_ta[1].stack())
att_weight = _transpose_batch_time(
loop_state_ta[0].stack()) #e_{j}
att_weight = tf.reshape(att_weight, [
-1, self.max_length - 1
]) * rnn_mask_att # masking to set 0 for the unmeasured e_{j}
#get a_{j} = e_{j}/sum_{l=1}^{M-1}e_{l}
self.att_weight = div(
att_weight, (tf.reduce_sum(att_weight, axis=1, keepdims=True) +
_EPSILON)) #softmax (tf.exp is done, previously)
# 1) expand att_weight to hidden state dimension, 2) c = \sum_{j=1}^{M} a_{j} x h_{j}
self.context_vec = tf.reduce_sum(tf.tile(
tf.reshape(self.att_weight, [-1, self.max_length - 1, 1]),
[1, 1, self.num_layers_RNN * self.h_dim1]) * rnn_states,
axis=1)
self.z_mean = FC_Net(rnn_outputs,
self.x_dim,
activation_fn=None,
weights_initializer=self.initial_W,
scope="RNN_out_mean1")
self.z_std = tf.exp(
FC_Net(rnn_outputs,
self.x_dim,
activation_fn=None,
weights_initializer=self.initial_W,
scope="RNN_out_std1"))
epsilon = tf.random_normal(
[self.mb_size, self.max_length - 1, self.x_dim],
mean=0.0,
stddev=1.0,
dtype=tf.float32)
self.z = self.z_mean + self.z_std * epsilon
##### CS-SPECIFIC SUBNETWORK w/ FCNETS
inputs = tf.concat([x_last, self.context_vec], axis=1)
#1 layer for combining inputs
h = FC_Net(inputs,
self.h_dim2,
activation_fn=self.FC_active_fn,
weights_initializer=self.initial_W,
scope="Layer1")
h = tf.nn.dropout(h, keep_prob=self.keep_prob)
# (num_layers_CS-1) layers for cause-specific (num_Event subNets)
out = []
for _ in range(self.num_Event):
cs_out = utils.create_FCNet(h, (self.num_layers_CS),
self.h_dim2, self.FC_active_fn,
self.h_dim2, self.FC_active_fn,
self.initial_W, self.reg_W,
self.keep_prob)
out.append(cs_out)
out = tf.stack(out, axis=1) # stack referenced on subject
out = tf.reshape(out, [-1, self.num_Event * self.h_dim2])
out = tf.nn.dropout(out, keep_prob=self.keep_prob)
out = FC_Net(out,
self.num_Event * self.num_Category,
activation_fn=tf.nn.softmax,
weights_initializer=self.initial_W,
weights_regularizer=self.reg_W_out,
scope="Output")
self.out = tf.reshape(out, [-1, self.num_Event, self.num_Category])
##### GET LOSS FUNCTIONS
self.loss_Log_Likelihood() #get loss1: Log-Likelihood loss
self.loss_Ranking() #get loss2: Ranking loss
self.loss_RNN_Prediction() #get loss3: RNN prediction loss
self.LOSS_TOTAL = self.a * self.LOSS_1 + self.b * self.LOSS_2 + self.c * self.LOSS_3 + tf.losses.get_regularization_loss(
)
self.LOSS_BURNIN = self.LOSS_3 + tf.losses.get_regularization_loss(
)
self.solver = tf.train.AdamOptimizer(
learning_rate=self.lr_rate).minimize(self.LOSS_TOTAL)
self.solver_burn_in = tf.train.AdamOptimizer(
learning_rate=self.lr_rate).minimize(self.LOSS_BURNIN)
