def get_linear_classifier(self, layer, token_weights, last_output=None, variable_scope=None, reuse=False):
""""""
if last_output is not None:
n_layers = 0
layer = last_output['hidden_layer']
recur_layer = last_output['recur_layer']
else:
n_layers = self.n_layers
recur_layer = layer
hidden_keep_prob = 1 if reuse else self.hidden_keep_prob
with tf.variable_scope(variable_scope or self.classname):
for i in six.moves.range(0, n_layers):
with tf.variable_scope('FC-%d' % i):
layer = classifiers.hidden(layer, self.hidden_size,
hidden_func=self.hidden_func,
hidden_keep_prob=hidden_keep_prob)
with tf.variable_scope('Classifier'):
logits = classifiers.linear_classifier(layer, len(self), hidden_keep_prob=hidden_keep_prob)
targets = self.placeholder
#-----------------------------------------------------------
# Compute probabilities/cross entropy
# (n x m x c) -> (n x m x c)
probabilities = tf.nn.softmax(logits)
# (n x m), (n x m x c), (n x m) -> ()
loss = tf.losses.sparse_softmax_cross_entropy(targets, logits, weights=token_weights)
#-----------------------------------------------------------
# Compute predictions/accuracy
# (n x m x c) -> (n x m)
predictions = tf.argmax(logits, axis=-1, output_type=tf.int32)
# (n x m) (*) (n x m) -> (n x m)
correct_tokens = nn.equal(targets, predictions) * token_weights
# (n x m) -> (n)
tokens_per_sequence = tf.reduce_sum(token_weights, axis=-1)
# (n x m) -> (n)
correct_tokens_per_sequence = tf.reduce_sum(correct_tokens, axis=-1)
# (n), (n) -> (n)
correct_sequences = nn.equal(tokens_per_sequence, correct_tokens_per_sequence)
#-----------------------------------------------------------
# Populate the output dictionary
outputs = {}
outputs['recur_layer'] = recur_layer
outputs['hidden_layer'] = layer
outputs['targets'] = targets
outputs['probabilities'] = probabilities
outputs['loss'] = loss
outputs['predictions'] = predictions
outputs['n_correct_tokens'] = tf.reduce_sum(correct_tokens)
outputs['n_correct_sequences'] = tf.reduce_sum(correct_sequences)
return outputs
def get_bilinear_classifier(self,
layer,
token_weights,
variable_scope=None,
reuse=False):
""""""
recur_layer = layer
hidden_keep_prob = 1 if reuse else self.hidden_keep_prob
hidden_func = self.hidden_func
hidden_size = self.hidden_size
add_linear = self.add_linear
linearize = self.linearize
distance = self.distance
n_splits = 2 * (1 + linearize + distance)
with tf.variable_scope(variable_scope or self.field):
for i in six.moves.range(0, self.n_layers - 1):
with tf.variable_scope('FC-%d' % i):
layer = classifiers.hidden(
layer,
n_splits * hidden_size,
hidden_func=hidden_func,
hidden_keep_prob=hidden_keep_prob)
with tf.variable_scope('FC-top'):
layers = classifiers.hiddens(layer,
n_splits * [hidden_size],
hidden_func=hidden_func,
hidden_keep_prob=hidden_keep_prob)
layer1, layer2 = layers.pop(0), layers.pop(0)
if linearize:
lin_layer1, lin_layer2 = layers.pop(0), layers.pop(0)
if distance:
dist_layer1, dist_layer2 = layers.pop(0), layers.pop(0)
with tf.variable_scope('Attention'):
if self.diagonal:
logits, _ = classifiers.diagonal_bilinear_attention(
layer1,
layer2,
hidden_keep_prob=hidden_keep_prob,
add_linear=add_linear)
if linearize:
with tf.variable_scope('Linearization'):
lin_logits = classifiers.diagonal_bilinear_discriminator(
lin_layer1,
lin_layer2,
hidden_keep_prob=hidden_keep_prob,
add_linear=add_linear)
if distance:
with tf.variable_scope('Distance'):
dist_lamda = 1 + tf.nn.softplus(
classifiers.diagonal_bilinear_discriminator(
dist_layer1,
dist_layer2,
hidden_keep_prob=hidden_keep_prob,
add_linear=add_linear))
else:
logits, _ = classifiers.bilinear_attention(
layer1,
layer2,
hidden_keep_prob=hidden_keep_prob,
add_linear=add_linear)
if linearize:
with tf.variable_scope('Linearization'):
lin_logits = classifiers.bilinear_discriminator(
lin_layer1,
lin_layer2,
hidden_keep_prob=hidden_keep_prob,
add_linear=add_linear)
if distance:
with tf.variable_scope('Distance'):
dist_lamda = 1 + tf.nn.softplus(
classifiers.bilinear_discriminator(
dist_layer1,
dist_layer2,
hidden_keep_prob=hidden_keep_prob,
add_linear=add_linear))
#-----------------------------------------------------------
# Process the targets
targets = self.placeholder
shape = tf.shape(layer1)
batch_size, bucket_size = shape[0], shape[1]
# (1 x m)
ids = tf.expand_dims(tf.range(bucket_size), 0)
# (1 x m) -> (1 x 1 x m)
head_ids = tf.expand_dims(ids, -2)
# (1 x m) -> (1 x m x 1)
dep_ids = tf.expand_dims(ids, -1)
if linearize:
# Wherever the head is to the left
# (n x m), (1 x m) -> (n x m)
lin_targets = tf.to_float(tf.less(targets, ids))
# cross-entropy of the linearization of each i,j pair
# (1 x 1 x m), (1 x m x 1) -> (n x m x m)
lin_ids = tf.tile(tf.less(head_ids, dep_ids),
[batch_size, 1, 1])
# (n x 1 x m), (n x m x 1) -> (n x m x m)
lin_xent = -tf.nn.softplus(
tf.where(lin_ids, -lin_logits, lin_logits))
# add the cross-entropy to the logits
# (n x m x m), (n x m x m) -> (n x m x m)
logits += tf.stop_gradient(lin_xent)
if distance:
# (n x m) - (1 x m) -> (n x m)
dist_targets = tf.abs(targets - ids)
# KL-divergence of the distance of each i,j pair
# (1 x 1 x m) - (1 x m x 1) -> (n x m x m)
dist_ids = tf.to_float(
tf.tile(tf.abs(head_ids - dep_ids),
[batch_size, 1, 1])) + 1e-12
# (n x m x m), (n x m x m) -> (n x m x m)
#dist_kld = (dist_ids * tf.log(dist_lamda / dist_ids) + dist_ids - dist_lamda)
dist_kld = -tf.log((dist_ids - dist_lamda)**2 / 2 + 1)
# add the KL-divergence to the logits
# (n x m x m), (n x m x m) -> (n x m x m)
logits += tf.stop_gradient(dist_kld)
#-----------------------------------------------------------
# Compute probabilities/cross entropy
# (n x m) + (m) -> (n x m)
non_pads = tf.to_float(token_weights) + tf.to_float(
tf.logical_not(
tf.cast(tf.range(bucket_size), dtype=tf.bool)))
# (n x m x m) o (n x 1 x m) -> (n x m x m)
probabilities = tf.nn.softmax(logits) * tf.expand_dims(
non_pads, -2)
# (n x m), (n x m x m), (n x m) -> ()
loss = tf.losses.sparse_softmax_cross_entropy(
targets, logits, weights=token_weights)
# (n x m) -> (n x m x m x 1)
one_hot_targets = tf.expand_dims(
tf.one_hot(targets, bucket_size), -1)
# (n x m) -> ()
n_tokens = tf.to_float(tf.reduce_sum(token_weights))
if linearize:
# (n x m x m) -> (n x m x 1 x m)
lin_xent_reshaped = tf.expand_dims(lin_xent, -2)
# (n x m x 1 x m) * (n x m x m x 1) -> (n x m x 1 x 1)
lin_target_xent = tf.matmul(lin_xent_reshaped,
one_hot_targets)
# (n x m x 1 x 1) -> (n x m)
lin_target_xent = tf.squeeze(lin_target_xent, [-1, -2])
# (n x m), (n x m), (n x m) -> ()
loss -= tf.reduce_sum(
lin_target_xent *
tf.to_float(token_weights)) / (n_tokens + 1e-12)
if distance:
# (n x m x m) -> (n x m x 1 x m)
dist_kld_reshaped = tf.expand_dims(dist_kld, -2)
# (n x m x 1 x m) * (n x m x m x 1) -> (n x m x 1 x 1)
dist_target_kld = tf.matmul(dist_kld_reshaped,
one_hot_targets)
# (n x m x 1 x 1) -> (n x m)
dist_target_kld = tf.squeeze(dist_target_kld, [-1, -2])
# (n x m), (n x m), (n x m) -> ()
loss -= tf.reduce_sum(
dist_target_kld *
tf.to_float(token_weights)) / (n_tokens + 1e-12)
#-----------------------------------------------------------
# Compute predictions/accuracy
# (n x m x m) -> (n x m)
predictions = tf.argmax(logits, axis=-1, output_type=tf.int32)
# (n x m) (*) (n x m) -> (n x m)
correct_tokens = nn.equal(targets, predictions) * token_weights
# (n x m) -> (n)
tokens_per_sequence = tf.reduce_sum(token_weights, axis=-1)
# (n x m) -> (n)
correct_tokens_per_sequence = tf.reduce_sum(correct_tokens,
axis=-1)
# (n), (n) -> (n)
correct_sequences = nn.equal(tokens_per_sequence,
correct_tokens_per_sequence)
#-----------------------------------------------------------
# Populate the output dictionary
outputs = {}
outputs['recur_layer'] = recur_layer
outputs['unlabeled_targets'] = self.placeholder
outputs['probabilities'] = probabilities
outputs['unlabeled_loss'] = loss
outputs['loss'] = loss
outputs['unlabeled_predictions'] = predictions
outputs['predictions'] = predictions
outputs['correct_unlabeled_tokens'] = correct_tokens
outputs['n_correct_unlabeled_tokens'] = tf.reduce_sum(correct_tokens)
outputs['n_correct_unlabeled_sequences'] = tf.reduce_sum(
correct_sequences)
outputs['n_correct_tokens'] = tf.reduce_sum(correct_tokens)
outputs['n_correct_sequences'] = tf.reduce_sum(correct_sequences)
return outputs
def get_bilinear_discriminator(self,
layer,
token_weights,
variable_scope=None,
reuse=False):
""""""
recur_layer = layer
hidden_keep_prob = 1 if reuse else self.hidden_keep_prob
add_linear = self.add_linear
n_splits = 2 * (1 + self.linearize + self.distance)
with tf.variable_scope(variable_scope or self.field):
for i in six.moves.range(0, self.n_layers - 1):
with tf.variable_scope('FC-%d' % i):
layer = classifiers.hidden(
layer,
n_splits * self.hidden_size,
hidden_func=self.hidden_func,
hidden_keep_prob=hidden_keep_prob)
with tf.variable_scope('FC-top'):
layers = classifiers.hiddens(layer,
n_splits * [self.hidden_size],
hidden_func=self.hidden_func,
hidden_keep_prob=hidden_keep_prob)
layer1, layer2 = layers.pop(0), layers.pop(0)
if self.linearize:
lin_layer1, lin_layer2 = layers.pop(0), layers.pop(0)
if self.distance:
dist_layer1, dist_layer2 = layers.pop(0), layers.pop(0)
with tf.variable_scope('Discriminator'):
if self.diagonal:
logits = classifiers.diagonal_bilinear_discriminator(
layer1,
layer2,
hidden_keep_prob=hidden_keep_prob,
add_linear=add_linear)
if self.linearize:
with tf.variable_scope('Linearization'):
lin_logits = classifiers.diagonal_bilinear_discriminator(
lin_layer1,
lin_layer2,
hidden_keep_prob=hidden_keep_prob,
add_linear=add_linear)
if self.distance:
with tf.variable_scope('Distance'):
dist_lamda = 1 + tf.nn.softplus(
classifiers.diagonal_bilinear_discriminator(
dist_layer1,
dist_layer2,
hidden_keep_prob=hidden_keep_prob,
add_linear=add_linear))
else:
logits = classifiers.bilinear_discriminator(
layer1,
layer2,
hidden_keep_prob=hidden_keep_prob,
add_linear=add_linear)
if self.linearize:
with tf.variable_scope('Linearization'):
lin_logits = classifiers.bilinear_discriminator(
lin_layer1,
lin_layer2,
hidden_keep_prob=hidden_keep_prob,
add_linear=add_linear)
if self.distance:
with tf.variable_scope('Distance'):
dist_lamda = 1 + tf.nn.softplus(
classifiers.bilinear_discriminator(
dist_layer1,
dist_layer2,
hidden_keep_prob=hidden_keep_prob,
add_linear=add_linear))
#-----------------------------------------------------------
# Process the targets
# (n x m x m) -> (n x m x m)
unlabeled_targets = self.placeholder
shape = tf.shape(layer1)
batch_size, bucket_size = shape[0], shape[1]
# (1 x m)
ids = tf.expand_dims(tf.range(bucket_size), 0)
# (1 x m) -> (1 x 1 x m)
head_ids = tf.expand_dims(ids, -2)
# (1 x m) -> (1 x m x 1)
dep_ids = tf.expand_dims(ids, -1)
if self.linearize:
# Wherever the head is to the left
# (n x m x m), (1 x m x 1) -> (n x m x m)
lin_targets = tf.to_float(
tf.less(unlabeled_targets, dep_ids))
# cross-entropy of the linearization of each i,j pair
# (1 x 1 x m), (1 x m x 1) -> (n x m x m)
lin_ids = tf.tile(tf.less(head_ids, dep_ids),
[batch_size, 1, 1])
# (n x 1 x m), (n x m x 1) -> (n x m x m)
lin_xent = -tf.nn.softplus(
tf.where(lin_ids, -lin_logits, lin_logits))
# add the cross-entropy to the logits
# (n x m x m), (n x m x m) -> (n x m x m)
logits += tf.stop_gradient(lin_xent)
if self.distance:
# (n x m x m) - (1 x m x 1) -> (n x m x m)
dist_targets = tf.abs(unlabeled_targets - dep_ids)
# KL-divergence of the distance of each i,j pair
# (1 x 1 x m) - (1 x m x 1) -> (n x m x m)
dist_ids = tf.to_float(
tf.tile(tf.abs(head_ids - dep_ids),
[batch_size, 1, 1])) + 1e-12
# (n x m x m), (n x m x m) -> (n x m x m)
#dist_kld = (dist_ids * tf.log(dist_lamda / dist_ids) + dist_ids - dist_lamda)
dist_kld = -tf.log((dist_ids - dist_lamda)**2 / 2 + 1)
# add the KL-divergence to the logits
# (n x m x m), (n x m x m) -> (n x m x m)
logits += tf.stop_gradient(dist_kld)
#-----------------------------------------------------------
# Compute probabilities/cross entropy
# (n x m x m) -> (n x m x m)
probabilities = tf.nn.sigmoid(logits) * tf.to_float(
token_weights)
# (n x m x m), (n x m x m), (n x m x m) -> ()
loss = tf.losses.sigmoid_cross_entropy(unlabeled_targets,
logits,
weights=token_weights)
n_tokens = tf.to_float(tf.reduce_sum(token_weights))
if self.linearize:
lin_target_xent = lin_xent * unlabeled_targets
loss -= tf.reduce_sum(
lin_target_xent *
tf.to_float(token_weights)) / (n_tokens + 1e-12)
if self.distance:
dist_target_kld = dist_kld * unlabeled_targets
loss -= tf.reduce_sum(
dist_target_kld *
tf.to_float(token_weights)) / (n_tokens + 1e-12)
#-----------------------------------------------------------
# Compute predictions/accuracy
# (n x m x m) -> (n x m x m)
predictions = nn.greater(logits, 0,
dtype=tf.int32) * token_weights
# (n x m x m) (*) (n x m x m) -> (n x m x m)
true_positives = predictions * unlabeled_targets
# (n x m x m) -> ()
n_predictions = tf.reduce_sum(predictions)
n_targets = tf.reduce_sum(unlabeled_targets)
n_true_positives = tf.reduce_sum(true_positives)
# () - () -> ()
n_false_positives = n_predictions - n_true_positives
n_false_negatives = n_targets - n_true_positives
# (n x m x m) -> (n)
n_targets_per_sequence = tf.reduce_sum(unlabeled_targets,
axis=[1, 2])
n_true_positives_per_sequence = tf.reduce_sum(true_positives,
axis=[1, 2])
# (n) x 2 -> ()
n_correct_sequences = tf.reduce_sum(
nn.equal(n_true_positives_per_sequence,
n_targets_per_sequence))
#-----------------------------------------------------------
# Populate the output dictionary
outputs = {}
outputs['unlabeled_targets'] = unlabeled_targets
outputs['probabilities'] = probabilities
outputs['unlabeled_loss'] = loss
outputs['loss'] = loss
outputs['unlabeled_predictions'] = predictions
outputs['n_unlabeled_true_positives'] = n_true_positives
outputs['n_unlabeled_false_positives'] = n_false_positives
outputs['n_unlabeled_false_negatives'] = n_false_negatives
outputs['n_correct_unlabeled_sequences'] = n_correct_sequences
outputs['predictions'] = predictions
outputs['n_true_positives'] = n_true_positives
outputs['n_false_positives'] = n_false_positives
outputs['n_false_negatives'] = n_false_negatives
outputs['n_correct_sequences'] = n_correct_sequences
return outputs
def get_unfactored_bilinear_classifier(self, layer, token_weights, variable_scope=None, reuse=False):
""""""
recur_layer = layer
hidden_keep_prob = 1 if reuse else self.hidden_keep_prob
add_linear = self.add_linear
with tf.variable_scope(variable_scope or self.field):
for i in six.moves.range(0, self.n_layers-1):
with tf.variable_scope('FC-%d' % i):
layer = classifiers.hidden(layer, 2*self.hidden_size,
hidden_func=self.hidden_func,
hidden_keep_prob=hidden_keep_prob)
with tf.variable_scope('FC-top' % i):
layers = classifiers.hidden(layer, 2*[self.hidden_size],
hidden_func=self.hidden_func,
hidden_keep_prob=hidden_keep_prob)
layer1, layer2 = layers.pop(0), layers.pop(0)
with tf.variable_scope('Classifier'):
if self.diagonal:
logits = classifiers.diagonal_bilinear_classifier(
layer1, layer2, len(self),
hidden_keep_prob=hidden_keep_prob,
add_linear=add_linear)
else:
logits = classifiers.bilinear_classifier(
layer1, layer2, len(self),
hidden_keep_prob=hidden_keep_prob,
add_linear=add_linear)
#-----------------------------------------------------------
# Process the targets
targets = self.placeholder
# (n x m x m) -> (n x m x m)
unlabeled_targets = nn.greater(targets, 0)
#-----------------------------------------------------------
# Process the logits
# (n x m x c x m) -> (n x m x m x c)
transposed_logits = tf.transpose(logits, [0,1,3,2])
#-----------------------------------------------------------
# Compute probabilities/cross entropy
# (n x m x m x c) -> (n x m x m x c)
probabilities = tf.nn.softmax(transposed_logits) * tf.to_float(tf.expand_dims(token_weights, axis=-1))
# (n x m x m), (n x m x m x c), (n x m x m) -> ()
loss = tf.losses.sparse_softmax_cross_entropy(targets, transposed_logits, weights=token_weights)
#-----------------------------------------------------------
# Compute predictions/accuracy
# (n x m x m x c) -> (n x m x m)
predictions = tf.argmax(transposed_logits, axis=-1, output_type=tf.int32) * token_weights
# (n x m x m) -> (n x m x m)
unlabeled_predictions = nn.greater(predictions, 0)
# (n x m x m) (*) (n x m x m) -> (n x m x m)
unlabeled_true_positives = unlabeled_predictions * unlabeled_targets
true_positives = nn.equal(targets, predictions) * unlabeled_true_positives
# (n x m x m) -> ()
n_predictions = tf.reduce_sum(unlabeled_predictions)
n_targets = tf.reduce_sum(unlabeled_targets)
n_unlabeled_true_positives = tf.reduce_sum(unlabeled_true_positives)
n_true_positives = tf.reduce_sum(true_positives)
# () - () -> ()
n_unlabeled_false_positives = n_predictions - n_unlabeled_true_positives
n_unlabeled_false_negatives = n_targets - n_unlabeled_true_positives
n_false_positives = n_predictions - n_true_positives
n_false_negatives = n_targets - n_true_positives
# (n x m x m) -> (n)
n_targets_per_sequence = tf.reduce_sum(unlabeled_targets, axis=[1,2])
n_unlabeled_true_positives_per_sequence = tf.reduce_sum(unlabeled_true_positives, axis=[1,2])
n_true_positives_per_sequence = tf.reduce_sum(true_positives, axis=[1,2])
# (n) x 2 -> ()
n_correct_unlabeled_sequences = tf.reduce_sum(nn.equal(n_unlabeled_true_positives_per_sequence, n_targets_per_sequence))
n_correct_sequences = tf.reduce_sum(nn.equal(n_true_positives_per_sequence, n_targets_per_sequence))
#-----------------------------------------------------------
# Populate the output dictionary
outputs = {}
outputs['recur_layer'] = recur_layer
outputs['unlabeled_targets'] = unlabeled_targets
outputs['label_targets'] = self.placeholder
outputs['probabilities'] = probabilities
outputs['unlabeled_loss'] = tf.constant(0.)
outputs['loss'] = loss
outputs['unlabeled_predictions'] = unlabeled_predictions
outputs['label_predictions'] = predictions
outputs['n_unlabeled_true_positives'] = n_unlabeled_true_positives
outputs['n_unlabeled_false_positives'] = n_unlabeled_false_positives
outputs['n_unlabeled_false_negatives'] = n_unlabeled_false_negatives
outputs['n_correct_unlabeled_sequences'] = n_correct_unlabeled_sequences
outputs['n_true_positives'] = n_true_positives
outputs['n_false_positives'] = n_false_positives
outputs['n_false_negatives'] = n_false_negatives
outputs['n_correct_sequences'] = n_correct_sequences
return outputs
def get_bilinear_discriminator(self, layer, token_weights, variable_scope=None, reuse=False):
""""""
recur_layer = layer
hidden_keep_prob = 1 if reuse else self.hidden_keep_prob
add_linear = self.add_linear
with tf.variable_scope(variable_scope or self.classname):
for i in six.moves.range(0, self.n_layers-1):
with tf.variable_scope('FC-%d' % i):
layer = classifiers.hidden(layer, 2*self.hidden_size,
hidden_func=self.hidden_func,
hidden_keep_prob=hidden_keep_prob)
with tf.variable_scope('FC-top' % i):
layers = classifiers.hiddens(layer, 2*[self.hidden_size],
hidden_func=self.hidden_func,
hidden_keep_prob=hidden_keep_prob)
layer1, layer2 = layers.pop(0), layers.pop(0)
with tf.variable_scope('Discriminator'):
if self.diagonal:
logits = classifiers.diagonal_bilinear_discriminator(
layer1, layer2,
hidden_keep_prob=hidden_keep_prob,
add_linear=add_linear)
else:
logits = classifiers.bilinear_discriminator(
layer1, layer2,
hidden_keep_prob=hidden_keep_prob,
add_linear=add_linear)
#-----------------------------------------------------------
# Process the targets
# (n x m x m) -> (n x m x m)
unlabeled_targets = nn.greater(self.placeholder, 0)
#-----------------------------------------------------------
# Compute probabilities/cross entropy
# (n x m x m) -> (n x m x m)
probabilities = tf.nn.sigmoid(logits)
# (n x m x m), (n x m x m x c), (n x m x m) -> ()
loss = tf.losses.sigmoid_cross_entropy(unlabeled_targets, logits, weights=token_weights)
#-----------------------------------------------------------
# Compute predictions/accuracy
# (n x m x m x c) -> (n x m x m)
predictions = nn.greater(logits, 0, dtype=tf.int32) * token_weights
# (n x m x m) (*) (n x m x m) -> (n x m x m)
true_positives = predictions * unlabeled_targets
# (n x m x m) -> ()
n_predictions = tf.reduce_sum(predictions)
n_targets = tf.reduce_sum(unlabeled_targets)
n_true_positives = tf.reduce_sum(true_positives)
# () - () -> ()
n_false_positives = n_predictions - n_true_positives
n_false_negatives = n_targets - n_true_positives
# (n x m x m) -> (n)
n_targets_per_sequence = tf.reduce_sum(unlabeled_targets, axis=[1,2])
n_true_positives_per_sequence = tf.reduce_sum(true_positives, axis=[1,2])
# (n) x 2 -> ()
n_correct_sequences = tf.reduce_sum(nn.equal(n_true_positives_per_sequence, n_targets_per_sequence))
#-----------------------------------------------------------
# Populate the output dictionary
outputs = {}
outputs['recur_layer'] = recur_layer
outputs['unlabeled_targets'] = unlabeled_targets
outputs['probabilities'] = probabilities
outputs['unlabeled_loss'] = loss
outputs['loss'] = loss
outputs['unlabeled_predictions'] = predictions
outputs['n_unlabeled_true_positives'] = n_true_positives
outputs['n_unlabeled_false_positives'] = n_false_positives
outputs['n_unlabeled_false_negatives'] = n_false_negatives
outputs['n_correct_unlabeled_sequences'] = n_correct_sequences
outputs['predictions'] = predictions
outputs['n_true_positives'] = n_true_positives
outputs['n_false_positives'] = n_false_positives
outputs['n_false_negatives'] = n_false_negatives
outputs['n_correct_sequences'] = n_correct_sequences
return outputs
def get_unfactored_bilinear_classifier(self, layer, unlabeled_targets, token_weights, variable_scope=None, reuse=False):
""""""
recur_layer = layer
hidden_keep_prob = 1 if reuse else self.hidden_keep_prob
hidden_func = self.hidden_func
hidden_size = self.hidden_size
add_linear = self.add_linear
with tf.variable_scope(variable_scope or self.classname):
for i in six.moves.range(0, self.n_layers-1):
with tf.variable_scope('FC-%d' % i):
layer = classifiers.hidden(layer, 2*hidden_size,
hidden_func=hidden_func,
hidden_keep_prob=hidden_keep_prob)
with tf.variable_scope('FC-top'):
layers = classifiers.hiddens(layer, 2*[hidden_size],
hidden_func=hidden_func,
hidden_keep_prob=hidden_keep_prob)
layer1, layer2 = layers.pop(0), layers.pop(0)
with tf.variable_scope('Classifier'):
if self.diagonal:
logits = classifiers.diagonal_bilinear_classifier(
layer1, layer2, len(self),
hidden_keep_prob=hidden_keep_prob,
add_linear=add_linear)
else:
logits = classifiers.bilinear_classifier(
layer1, layer2, len(self),
hidden_keep_prob=hidden_keep_prob,
add_linear=add_linear)
bucket_size = tf.shape(layer)[-2]
#-------------------------------------------------------
# Process the targets
# c (*) (n x m) + (n x m)
#targets = len(self) * unlabeled_targets + self.placeholder
targets = bucket_size * self.placeholder + unlabeled_targets
#-------------------------------------------------------
# Process the logits
# (n x m x c x m) -> (n x m x cm)
reshaped_logits = tf.reshape(logits, tf.stack([-1, bucket_size, bucket_size * len(self)]))
#-------------------------------------------------------
# Compute probabilities/cross entropy
# (n x m x cm) -> (n x m x cm)
probabilities = tf.nn.softmax(reshaped_logits)
# (n x m x cm) -> (n x m x c x m)
probabilities = tf.reshape(probabilities, tf.stack([-1, bucket_size, len(self), bucket_size]))
# (n x m x c x m) -> (n x m x m x c)
probabilities = tf.transpose(probabilities, [0,1,3,2])
# (n x m), (n x m x cm), (n x m) -> ()
loss = tf.losses.sparse_softmax_cross_entropy(targets, reshaped_logits, weights=token_weights)
#-------------------------------------------------------
# Compute predictions/accuracy
# (n x m x cm) -> (n x m)
predictions = tf.argmax(reshaped_logits, axis=-1, output_type=tf.int32)
# (n x m), () -> (n x m)
unlabeled_predictions = tf.mod(predictions, bucket_size)
# (n x m) (*) (n x m) -> (n x m)
correct_tokens = nn.equal(predictions, targets) * token_weights
correct_unlabeled_tokens = nn.equal(unlabeled_predictions, unlabeled_targets) * token_weights
# (n x m) -> (n)
tokens_per_sequence = tf.reduce_sum(token_weights, axis=-1)
# (n x m) -> (n)
correct_tokens_per_sequence = tf.reduce_sum(correct_tokens, axis=-1)
correct_unlabeled_tokens_per_sequence = tf.reduce_sum(correct_unlabeled_tokens, axis=-1)
# (n), (n) -> (n)
correct_sequences = nn.equal(tokens_per_sequence, correct_tokens_per_sequence)
correct_unlabeled_sequences = nn.equal(tokens_per_sequence, correct_unlabeled_tokens_per_sequence)
#-----------------------------------------------------------
# Populate the output dictionary
outputs = {}
outputs['recur_layer'] = recur_layer
outputs['unlabeled_targets'] = unlabeled_targets
outputs['probabilities'] = probabilities
outputs['unlabeled_loss'] = tf.constant(0.)
outputs['loss'] = loss
outputs['unlabeled_predictions'] = unlabeled_predictions
outputs['label_predictions'] = predictions
outputs['n_correct_unlabeled_tokens'] = tf.reduce_sum(correct_unlabeled_tokens)
outputs['n_correct_unlabeled_sequences'] = tf.reduce_sum(correct_unlabeled_sequences)
outputs['n_correct_tokens'] = tf.reduce_sum(correct_tokens)
outputs['n_correct_sequences'] = tf.reduce_sum(correct_sequences)
return outputs
def get_bilinear_classifier(self, layer, outputs, token_weights, variable_scope=None, reuse=False):
""""""
layer1 = layer2 = layer
hidden_keep_prob = 1 if reuse else self.hidden_keep_prob
hidden_func = self.hidden_func
hidden_size = self.hidden_size
add_linear = self.add_linear
with tf.variable_scope(variable_scope or self.classname):
for i in six.moves.range(0, self.n_layers-1):
with tf.variable_scope('FC-%d' % i):
layer = classifiers.hidden(layer, 2*hidden_size,
hidden_func=hidden_func,
hidden_keep_prob=hidden_keep_prob)
with tf.variable_scope('FC-top'):
layers = classifiers.hiddens(layer, 2*[hidden_size],
hidden_func=hidden_func,
hidden_keep_prob=hidden_keep_prob)
layer1, layer2 = layers.pop(0), layers.pop(0)
with tf.variable_scope('Classifier'):
if self.diagonal:
logits = classifiers.diagonal_bilinear_classifier(
layer1, layer2, len(self),
hidden_keep_prob=hidden_keep_prob,
add_linear=add_linear)
else:
logits = classifiers.bilinear_classifier(
layer1, layer2, len(self),
hidden_keep_prob=hidden_keep_prob,
add_linear=add_linear)
bucket_size = tf.shape(layer)[-2]
#-------------------------------------------------------
# Process the targets
# (n x m)
label_targets = self.placeholder
unlabeled_predictions = outputs['unlabeled_predictions']
unlabeled_targets = outputs['unlabeled_targets']
# (n x m) -> (n x m x m)
unlabeled_predictions = tf.one_hot(unlabeled_predictions, bucket_size)
unlabeled_targets = tf.one_hot(unlabeled_targets, bucket_size)
# (n x m x m) -> (n x m x m x 1)
unlabeled_predictions = tf.expand_dims(unlabeled_predictions, axis=-1)
unlabeled_targets = tf.expand_dims(unlabeled_targets, axis=-1)
#-------------------------------------------------------
# Process the logits
# We use the gold heads for computing the label score and the predicted
# heads for computing the unlabeled attachment score
# (n x m x c x m) -> (n x m x m x c)
transposed_logits = tf.transpose(logits, [0,1,3,2])
# (n x m x c x m) * (n x m x m x 1) -> (n x m x c x 1)
predicted_logits = tf.matmul(logits, unlabeled_predictions)
oracle_logits = tf.matmul(logits, unlabeled_targets)
# (n x m x c x 1) -> (n x m x c)
predicted_logits = tf.squeeze(predicted_logits, axis=-1)
oracle_logits = tf.squeeze(oracle_logits, axis=-1)
#-------------------------------------------------------
# Compute probabilities/cross entropy
# (n x m x m) -> (n x m x m x 1)
head_probabilities = tf.expand_dims(tf.stop_gradient(outputs['probabilities']), axis=-1)
# (n x m x m x c) -> (n x m x m x c)
label_probabilities = tf.nn.softmax(transposed_logits)
# (n x m), (n x m x c), (n x m) -> ()
label_loss = tf.losses.sparse_softmax_cross_entropy(label_targets, oracle_logits, weights=token_weights)
#-------------------------------------------------------
# Compute predictions/accuracy
# (n x m x c) -> (n x m)
label_predictions = tf.argmax(predicted_logits, axis=-1, output_type=tf.int32)
label_oracle_predictions = tf.argmax(oracle_logits, axis=-1, output_type=tf.int32)
# (n x m) (*) (n x m) -> (n x m)
correct_label_tokens = nn.equal(label_targets, label_oracle_predictions) * token_weights
correct_tokens = nn.equal(label_targets, label_predictions) * outputs['correct_unlabeled_tokens']
# (n x m) -> (n)
tokens_per_sequence = tf.reduce_sum(token_weights, axis=-1)
# (n x m) -> (n)
correct_label_tokens_per_sequence = tf.reduce_sum(correct_label_tokens, axis=-1)
correct_tokens_per_sequence = tf.reduce_sum(correct_tokens, axis=-1)
# (n), (n) -> (n)
correct_label_sequences = nn.equal(tokens_per_sequence, correct_label_tokens_per_sequence)
correct_sequences = nn.equal(tokens_per_sequence, correct_tokens_per_sequence)
#-----------------------------------------------------------
# Populate the output dictionary
rho = self.loss_interpolation
outputs['label_targets'] = label_targets
# This way we can reconstruct the head_probabilities by exponentiating and summing along the last axis
outputs['probabilities'] = label_probabilities * head_probabilities
outputs['label_loss'] = label_loss
outputs['loss'] = 2*((1-rho) * outputs['loss'] + rho * label_loss)
outputs['label_predictions'] = label_predictions
outputs['n_correct_label_tokens'] = tf.reduce_sum(correct_label_tokens)
outputs['n_correct_label_sequences'] = tf.reduce_sum(correct_label_sequences)
outputs['n_correct_tokens'] = tf.reduce_sum(correct_tokens)
outputs['n_correct_sequences'] = tf.reduce_sum(correct_sequences)
return outputs
def get_sampled_linear_classifier(self, layer, n_samples, token_weights=None, variable_scope=None, reuse=False):
""""""
recur_layer = layer
hidden_keep_prob = 1 if reuse else self.hidden_keep_prob
with tf.variable_scope(variable_scope or self.classname):
for i in six.moves.range(0, self.n_layers):
with tf.variable_scope('FC-%d' % i):
layer = classifiers.hidden(layer, self.hidden_size,
hidden_func=self.hidden_func,
hidden_keep_prob=hidden_keep_prob)
batch_size, bucket_size, input_size = nn.get_sizes(layer)
layer = nn.dropout(layer, hidden_keep_prob, noise_shape=[batch_size, 1, input_size])
layer = nn.reshape(layer, [-1, input_size])
with tf.variable_scope('Classifier'):
# (s)
samples, _, _ = tf.nn.log_uniform_candidate_sampler(
nn.zeros([bucket_size,1], dtype=tf.int64),
1, n_samples, unique=True, range_max=len(self))
with tf.device('/gpu:1'):
weights = tf.get_variable('Weights', shape=[len(self), input_size], initializer=tf.zeros_initializer)
biases = tf.get_variable('Biases', shape=len(self), initializer=tf.zeros_initializer)
tf.add_to_collection('non_save_variables', weights)
tf.add_to_collection('non_save_variables', biases)
# (nm x 1)
targets = nn.reshape(self.placeholder, [-1, 1])
# (1 x s)
samples = tf.expand_dims(samples, 0)
# (nm x s)
samples = tf.to_int32(nn.tile(samples, [batch_size*bucket_size, 1]))
# (nm x s)
sample_weights = tf.to_float(nn.not_equal(samples, targets))
# (nm x 1+s)
cands = tf.stop_gradient(tf.concat([targets, samples], axis=-1))
# (nm x 1), (nm x s) -> (nm x 1+s)
cand_weights = tf.stop_gradient(tf.concat([nn.ones([batch_size*bucket_size, 1]), sample_weights], axis=-1))
# (c x d), (nm x 1+s) -> (nm x 1+s x d)
weights = tf.nn.embedding_lookup(weights, cands)
# (c), (nm x 1+s) -> (nm x 1+s)
biases = tf.nn.embedding_lookup(biases, cands)
# (n x m x d) -> (nm x d x 1)
layer_reshaped = nn.reshape(layer, [-1, input_size, 1])
# (nm x 1+s x d) * (nm x d x 1) -> (nm x 1+s x 1)
logits = tf.matmul(weights, layer_reshaped)
# (nm x 1+s x 1) -> (nm x 1+s)
logits = tf.squeeze(logits, -1)
#-----------------------------------------------------------
# Compute probabilities/cross entropy
# (nm x 1+s)
logits = logits - tf.reduce_max(logits, axis=-1, keep_dims=True)
# (nm x 1+s)
exp_logits = tf.exp(logits) * cand_weights
# (nm x 1)
exp_logit_sum = tf.reduce_sum(exp_logits, axis=-1, keep_dims=True)
# (nm x 1+s)
probabilities = exp_logits / exp_logit_sum
# (nm x 1+s) -> (n x m x 1+s)
probabilities = nn.reshape(probabilities, [batch_size, bucket_size, 1+n_samples])
# (nm x 1+s) -> (n x m x 1+s)
samples = nn.reshape(samples, [batch_size, bucket_size, 1+n_samples])
# (nm x 1+s) -> (nm x 1), (nm x s)
target_logits, _ = tf.split(logits, [1, n_samples], axis=1)
# (nm x 1) - (nm x 1) -> (nm x 1)
loss = tf.log(exp_logit_sum) - target_logits
# (n x m) -> (nm x 1)
token_weights1D = tf.to_float(nn.reshape(token_weights, [-1,1]))
# (nm x 1) -> ()
loss = tf.reduce_sum(loss*token_weights1D) / tf.reduce_sum(token_weights1D)
#-----------------------------------------------------------
# Compute predictions/accuracy
# (nm x 1+s) -> (n x m x 1+s)
logits = nn.reshape(logits, [batch_size, bucket_size, -1])
# (n x m x 1+s) -> (n x m)
predictions = tf.argmax(logits, axis=-1, output_type=tf.int32)
# (n x m) (*) (n x m) -> (n x m)
correct_tokens = nn.equal(predictions, 0) * token_weights
# (n x m) -> (n)
tokens_per_sequence = tf.reduce_sum(token_weights, axis=-1)
# (n x m) -> (n)
correct_tokens_per_sequence = tf.reduce_sum(correct_tokens, axis=-1)
# (n), (n) -> (n)
correct_sequences = nn.equal(tokens_per_sequence, correct_tokens_per_sequence)
#-----------------------------------------------------------
# Populate the output dictionary
outputs = {}
outputs['recur_layer'] = recur_layer
outputs['targets'] = targets
outputs['probabilities'] = tf.tuple([samples, probabilities])
outputs['loss'] = loss
outputs['predictions'] = predictions
outputs['n_correct_tokens'] = tf.reduce_sum(correct_tokens)
outputs['n_correct_sequences'] = tf.reduce_sum(correct_sequences)
return outputs
def get_linear_classifier(self, layer, token_weights, last_output=None, variable_scope=None, reuse=False):
""""""
if last_output:
n_layers = 0
layer = last_output['hidden_layer']
recur_layer = last_output['recur_layer']
else:
n_layers = self.n_layers
recur_layer = layer
hidden_keep_prob = 1 if reuse else self.hidden_keep_prob
with tf.variable_scope(variable_scope or self.classname):
for i in six.moves.range(0, self.n_layers):
with tf.variable_scope('FC-%d' % i):
layer = classifiers.hidden(layer, self.hidden_size,
hidden_func=self.hidden_func,
hidden_keep_prob=hidden_keep_prob)
with tf.variable_scope('Classifier'):
probabilities = []
loss = []
predictions = []
correct_tokens = []
for i, feat in enumerate(self._feats):
vs_feat = str(feat).replace('[', '-RSB-').replace(']', '-LSB-')
with tf.variable_scope(vs_feat):
logits = classifiers.linear_classifier(layer, self.getlen(feat), hidden_keep_prob=hidden_keep_prob)
targets = self.placeholder[:,:,i]
#---------------------------------------------------
# Compute probabilities/cross entropy
# (n x m x c) -> (n x m x c)
probabilities.append(tf.nn.softmax(logits))
# (n x m), (n x m x c), (n x m) -> ()
loss.append(tf.losses.sparse_softmax_cross_entropy(targets, logits, weights=token_weights))
#---------------------------------------------------
# Compute predictions/accuracy
# (n x m x c) -> (n x m)
predictions.append(tf.argmax(logits, axis=-1, output_type=tf.int32))
# (n x m) (*) (n x m) -> (n x m)
correct_tokens.append(nn.equal(targets, predictions[-1]))
# (n x m) x f -> (n x m x f)
predictions = tf.stack(predictions, axis=-1)
# (n x m) x f -> (n x m x f)
correct_tokens = tf.stack(correct_tokens, axis=-1)
# (n x m x f) -> (n x m)
correct_tokens = tf.reduce_prod(correct_tokens, axis=-1) * token_weights
# (n x m) -> (n)
tokens_per_sequence = tf.reduce_sum(token_weights, axis=-1)
# (n x m) -> (n)
correct_tokens_per_sequence = tf.reduce_sum(correct_tokens, axis=-1)
# (n), (n) -> (n)
correct_sequences = nn.equal(tokens_per_sequence, correct_tokens_per_sequence)
#-----------------------------------------------------------
# Populate the output dictionary
outputs = {}
outputs['recur_layer'] = recur_layer
outputs['targets'] = self.placeholder
outputs['probabilities'] = probabilities
outputs['loss'] = tf.add_n(loss)
outputs['predictions'] = predictions
outputs['n_correct_tokens'] = tf.reduce_sum(correct_tokens)
outputs['n_correct_sequences'] = tf.reduce_sum(correct_sequences)
return outputs