def _compute_sparse_average_correct(input_, labels, per_example_weights, topk=1):
"""Returns the numerator and denominator of classifier accuracy."""
labels = tf.to_int64(labels)
labels.get_shape().assert_is_compatible_with([input_.get_shape()[0], None])
if topk == 1:
predictions = tf.reshape(tf.argmax(input_, 1), [-1, 1])
in_topk = tf.reduce_any(tf.equal(labels, predictions), reduction_indices=[1])
else:
# Use broadcasting to check if ANY of the predictions are in the top k.
# TODO(eiderman): For a multi-label top k, what does accuracy mean?
predictions = tf.reshape(tf.nn.top_k(input_, topk)[1], [-1, 1, topk])
labels = tf.expand_dims(labels, [-1])
in_topk = tf.reduce_any(tf.equal(tf.cast(labels, predictions.dtype), predictions), reduction_indices=[1, 2])
correct_predictions = tf.to_float(in_topk)
# If individual examples are weighted, then we want to normalize by that.
if per_example_weights is not None:
per_example_weights = _convert_and_assert_per_example_weights_compatible(
input_, per_example_weights, dtype=None
)
float_weights = tf.to_float(per_example_weights)
# TODO(eiderman): This should use an op that doesn't support broadcasting.
correct_predictions *= float_weights
num_examples = tf.reduce_sum(float_weights)
else:
# shape only holds ints, but we want to always return the same type
# for num_examples to make everything compatible.
num_examples = tf.to_float(tf.gather(tf.shape(input_), 0))
return tf.reduce_sum(correct_predictions), num_examples
def _compute_precision_recall(input_layer, labels, threshold,
per_example_weights):
"""Returns the numerator of both, the denominator of precision and recall."""
# To apply per_example_weights, we need to collapse each row to a scalar, but
# we really want the sum.
labels.get_shape().assert_is_compatible_with(input_layer.get_shape())
relevant = tf.to_float(tf.greater(labels, 0))
retrieved = tf.to_float(tf.greater(input_layer, threshold))
selected = relevant * retrieved
if per_example_weights:
per_example_weights = tf.convert_to_tensor(per_example_weights,
name='per_example_weights')
if selected.get_shape().dims:
per_example_weights.get_shape().assert_is_compatible_with(
[selected.get_shape().dims[0]])
else:
per_example_weights.get_shape().assert_is_compatible_with([None])
per_example_weights = tf.to_float(tf.greater(per_example_weights, 0))
selected = functions.reduce_batch_sum(selected) * per_example_weights
relevant = functions.reduce_batch_sum(relevant) * per_example_weights
retrieved = functions.reduce_batch_sum(retrieved) * per_example_weights
sum_relevant = tf.reduce_sum(relevant)
sum_retrieved = tf.reduce_sum(retrieved)
selected = tf.reduce_sum(selected)
return selected, sum_retrieved, sum_relevant
def get_idx_map(shape):
"""Get index map for a image.
Args:
shape: [B, T, H, W] or [B, H, W]
Returns:
idx: [B, T, H, W, 2], or [B, H, W, 2]
"""
s = shape
ndims = tf.shape(s)
wdim = ndims - 1
hdim = ndims - 2
idx_shape = tf.concat(0, [s, tf.constant([1])])
ones_h = tf.ones(hdim - 1, dtype='int32')
ones_w = tf.ones(wdim - 1, dtype='int32')
h_shape = tf.concat(0, [ones_h, tf.constant([-1]), tf.constant([1, 1])])
w_shape = tf.concat(0, [ones_w, tf.constant([-1]), tf.constant([1])])
idx_y = tf.zeros(idx_shape, dtype='float')
idx_x = tf.zeros(idx_shape, dtype='float')
h = tf.slice(s, ndims - 2, [1])
w = tf.slice(s, ndims - 1, [1])
idx_y += tf.reshape(tf.to_float(tf.range(h[0])), h_shape)
idx_x += tf.reshape(tf.to_float(tf.range(w[0])), w_shape)
idx = tf.concat(ndims[0], [idx_y, idx_x])
return idx
def ctrl_rewards(states,
actions,
rewards,
next_states,
contexts,
reward_scales=1.0):
"""Returns the negative control cost.
Args:
states: A [batch_size, num_state_dims] Tensor representing a batch
of states.
actions: A [batch_size, num_action_dims] Tensor representing a batch
of actions.
rewards: A [batch_size] Tensor representing a batch of rewards.
next_states: A [batch_size, num_state_dims] Tensor representing a batch
of next states.
contexts: A list of [batch_size, num_context_dims] Tensor representing
a batch of contexts.
reward_scales: multiplicative scale for rewards. A scalar or 1D tensor,
must be broadcastable to number of reward dimensions.
Returns:
A new tf.float32 [batch_size] rewards Tensor, and
tf.float32 [batch_size] discounts tensor.
"""
del states, rewards, contexts # Unused
if actions is None:
rewards = tf.to_float(tf.zeros(shape=next_states.shape[:1]))
else:
rewards = -tf.reduce_sum(tf.square(actions), axis=1)
rewards *= reward_scales
rewards = tf.to_float(rewards)
return rewards, tf.ones_like(rewards)
def compute_IOU(bboxA, bboxB):
"""Compute the Intersection Over Union.
Args:
bboxA: [N X 4 tensor] format = [left, top, right, bottom]
bboxB: [N X 4 tensor]
Return:
IOU: [N X 1 tensor]
"""
x1A, y1A, x2A, y2A = tf.split(1, 4, bboxA)
x1B, y1B, x2B, y2B = tf.split(1, 4, bboxB)
# compute intersection
x1_max = tf.maximum(x1A, x1B)
y1_max = tf.maximum(y1A, y1B)
x2_min = tf.minimum(x2A, x2B)
y2_min = tf.minimum(y2A, y2B)
# overlap_flag = tf.logical_and( tf.less(x1_max, x2_min), tf.less(y1_max, y2_min))
overlap_flag = tf.to_float(tf.less(x1_max, x2_min)) * \
tf.to_float(tf.less(y1_max, y2_min))
overlap_area = tf.mul(overlap_flag, tf.mul(
x2_min - x1_max, y2_min - y1_max))
# compute union
areaA = tf.mul(x2A - x1A, y2A - y1A)
areaB = tf.mul(x2B - x1B, y2B - y1B)
union_area = areaA + areaB - overlap_area
return tf.div(overlap_area, union_area)
def _init_training(self, optimizer):
with self.model_graph.as_default():
# счётчик обработанных батчей
self.batches_processed = tf.Variable(
initial_value=0, trainable=False
)
increment_batches = self.batches_processed.assign_add(1)
# аккумулятор для среднего значения потерь
self.average_loss = tf.Variable(
initial_value=0.0, trainable=False
)
# рекуррентный пересчёт среднего значения функции потерь
updated_loss = tf.truediv(
tf.add(
self.average_loss * tf.to_float(self.batches_processed),
self.loss
),
tf.to_float(self.batches_processed) + 1.0
)
update_average_loss = self.average_loss.assign(updated_loss)
opt_op = optimizer.minimize(self.loss)
# группируем операции оптимизации и обновления счётчиков в одну
with tf.control_dependencies([opt_op]):
self.train_op = tf.group(
update_average_loss, increment_batches
)
def testPaddingCrossEntropyFactored(self):
vocab_size = 19
rows = 5
cols = 4
depth = 11
label_smoothing = 0.1
features = np.random.rand(rows, cols, depth)
weights = np.random.rand(vocab_size, depth)
labels = np.random.randint(0, vocab_size - 1, size=(rows, cols))
with self.test_session() as session:
features = tf.to_float(features)
weights = tf.to_float(weights)
labels = tf.to_int32(labels)
logits = tf.matmul(
tf.reshape(features, [rows * cols, depth]), weights, transpose_b=True)
logits = tf.reshape(logits, [rows, cols, vocab_size])
loss_num, loss_den = common_layers.padded_cross_entropy(
logits, labels, label_smoothing=label_smoothing, reduce_sum=False)
factored_logits = common_layers.FactoredTensor(features, weights)
loss_num_f, loss_den_f = common_layers.padded_cross_entropy_factored(
factored_logits,
labels=labels,
label_smoothing=label_smoothing,
reduce_sum=False)
num, den, num_f, den_f = session.run(
[loss_num, loss_den, loss_num_f, loss_den_f])
self.assertEqual(num.shape, (rows, cols))
self.assertEqual(den.shape, (rows, cols))
self.assertEqual(num_f.shape, (rows, cols))
self.assertEqual(den_f.shape, (rows, cols))
self.assertAllClose(num, num_f)
self.assertAllClose(den, den_f)
def __init__(self, epsilon=1e-2, shape=()):
self._sum = tf.get_variable(
dtype=tf.float64,
shape=shape,
initializer=tf.constant_initializer(0.0),
name="runningsum", trainable=False)
self._sumsq = tf.get_variable(
dtype=tf.float64,
shape=shape,
initializer=tf.constant_initializer(epsilon),
name="runningsumsq", trainable=False)
self._count = tf.get_variable(
dtype=tf.float64,
shape=(),
initializer=tf.constant_initializer(epsilon),
name="count", trainable=False)
self.shape = shape
self.mean = tf.to_float(self._sum / self._count)
self.std = tf.sqrt( tf.maximum( tf.to_float(self._sumsq / self._count) - tf.square(self.mean) , 1e-2 ))
newsum = tf.placeholder(shape=self.shape, dtype=tf.float64, name='sum')
newsumsq = tf.placeholder(shape=self.shape, dtype=tf.float64, name='var')
newcount = tf.placeholder(shape=[], dtype=tf.float64, name='count')
self.incfiltparams = U.function([newsum, newsumsq, newcount], [],
updates=[tf.assign_add(self._sum, newsum),
tf.assign_add(self._sumsq, newsumsq),
tf.assign_add(self._count, newcount)])
def top_1_and_5(predictions, labels):
#test_size = FLAGS.test_size #tf.shape(predictions)[0]
in_top1 = tf.to_float(tf.nn.in_top_k(predictions, labels, k=1))
in_top5 = tf.to_float(tf.nn.in_top_k(predictions, labels, k=5))
num_correct_1 = tf.reduce_sum(in_top1, name ="top1")
num_correct_5 = tf.reduce_sum(in_top5, name ="top5")
return num_correct_1, num_correct_5
def char_accuracy(predictions, targets, rej_char, streaming=False):
"""Computes character level accuracy.
Both predictions and targets should have the same shape
[batch_size x seq_length].
Args:
predictions: predicted characters ids.
targets: ground truth character ids.
rej_char: the character id used to mark an empty element (end of sequence).
streaming: if True, uses the streaming mean from the slim.metric module.
Returns:
a update_ops for execution and value tensor whose value on evaluation
returns the total character accuracy.
"""
with tf.variable_scope('CharAccuracy'):
predictions.get_shape().assert_is_compatible_with(targets.get_shape())
targets = tf.to_int32(targets)
const_rej_char = tf.constant(rej_char, shape=targets.get_shape())
weights = tf.to_float(tf.not_equal(targets, const_rej_char))
correct_chars = tf.to_float(tf.equal(predictions, targets))
accuracy_per_example = tf.div(
tf.reduce_sum(tf.multiply(correct_chars, weights), 1),
tf.reduce_sum(weights, 1))
if streaming:
return tf.contrib.metrics.streaming_mean(accuracy_per_example)
else:
return tf.reduce_mean(accuracy_per_example)
def crop_or_pad(waves, length, channels):
"""Crop or pad wave to have shape [N, length, channels].
Args:
waves: A 3D `Tensor` of NLC format.
length: A Python scalar. The output wave size.
channels: Number of output waves channels.
Returns:
A 3D `Tensor` of NLC format with shape [N, length, channels].
"""
waves = tf.convert_to_tensor(waves)
batch_size = waves.shape[0].value
waves_shape = tf.shape(waves)
# Force audio length.
pad = tf.maximum(0, length - waves_shape[1])
right_pad = tf.to_int32(tf.to_float(pad) / 2.0)
left_pad = pad - right_pad
waves = tf.pad(waves, [[0, 0], [left_pad, right_pad], [0, 0]])
waves = waves[:, :length, :]
# Force number of channels.
num_repeats = tf.to_int32(
tf.ceil(tf.to_float(channels) / tf.to_float(waves_shape[2])))
waves = tf.tile(waves, [1, 1, num_repeats])[:, :, :channels]
waves.set_shape([batch_size, length, channels])
return waves
def attentive_pooling_weights(U_AP, raw_question_rep, raw_answer_rep, tokens_question, tokens_answer,
apply_softmax=True):
"""Calculates the attentive pooling weights for question and answer
:param U_AP: the soft-attention similarity matrix (to learn)
:param raw_question_rep:
:param raw_answer_rep:
:param tokens_question: The raw token indices of the question. Used to detection not-set tokens
:param tokens_answer: The raw token indices of the answer. Used to detection not-set tokens
:param Q_PW: Positional weighting matrix for the question
:param A_PW: Positional weighting matrix for the answer
:param apply_softmax:
:return: question weights, answer weights
"""
tokens_question_float = tf.to_float(tokens_question)
tokens_answer_float = tf.to_float(tokens_answer)
tokens_question_non_zero = non_zero_tokens(tokens_question_float)
tokens_answer_non_zero = non_zero_tokens(tokens_answer_float)
G = soft_alignment(U_AP, raw_question_rep, raw_answer_rep, tokens_question_non_zero, tokens_answer_non_zero)
maxpool_GQ = tf.reduce_max(G, [2], keep_dims=False)
maxpool_GA = tf.reduce_max(G, [1], keep_dims=False)
if apply_softmax:
attention_Q = attention_softmax(maxpool_GQ, tokens_question_non_zero)
attention_A = attention_softmax(maxpool_GA, tokens_answer_non_zero)
else:
attention_Q = maxpool_GQ
attention_A = maxpool_GA
return attention_Q, attention_A
def _summarize_input(self, groundtruth_boxes_list, match_list):
"""Creates tensorflow summaries for the input boxes and anchors.
This function creates four summaries corresponding to the average
number (over images in a batch) of (1) groundtruth boxes, (2) anchors
marked as positive, (3) anchors marked as negative, and (4) anchors marked
as ignored.
Args:
groundtruth_boxes_list: a list of 2-D tensors of shape [num_boxes, 4]
containing corners of the groundtruth boxes.
match_list: a list of matcher.Match objects encoding the match between
anchors and groundtruth boxes for each image of the batch,
with rows of the Match objects corresponding to groundtruth boxes
and columns corresponding to anchors.
"""
num_boxes_per_image = tf.stack(
[tf.shape(x)[0] for x in groundtruth_boxes_list])
pos_anchors_per_image = tf.stack(
[match.num_matched_columns() for match in match_list])
neg_anchors_per_image = tf.stack(
[match.num_unmatched_columns() for match in match_list])
ignored_anchors_per_image = tf.stack(
[match.num_ignored_columns() for match in match_list])
tf.summary.scalar('Input/AvgNumGroundtruthBoxesPerImage',
tf.reduce_mean(tf.to_float(num_boxes_per_image)))
tf.summary.scalar('Input/AvgNumPositiveAnchorsPerImage',
tf.reduce_mean(tf.to_float(pos_anchors_per_image)))
tf.summary.scalar('Input/AvgNumNegativeAnchorsPerImage',
tf.reduce_mean(tf.to_float(neg_anchors_per_image)))
tf.summary.scalar('Input/AvgNumIgnoredAnchorsPerImage',
tf.reduce_mean(tf.to_float(ignored_anchors_per_image)))
def log_loss(labels, predictions, epsilon=1e-7, scope=None, weights=None):
"""Calculate log losses.
Same as tf.losses.log_loss except that this returns the individual losses
instead of passing them into compute_weighted_loss and returning their
weighted mean. This is useful for eval jobs that report the mean loss. By
returning individual losses, that mean loss can be the same regardless of
batch size.
Args:
labels: The ground truth output tensor, same dimensions as 'predictions'.
predictions: The predicted outputs.
epsilon: A small increment to add to avoid taking a log of zero.
scope: The scope for the operations performed in computing the loss.
weights: Weights to apply to labels.
Returns:
A `Tensor` representing the loss values.
Raises:
ValueError: If the shape of `predictions` doesn't match that of `labels`.
"""
with tf.name_scope(scope, "log_loss", (predictions, labels)):
predictions = tf.to_float(predictions)
labels = tf.to_float(labels)
predictions.get_shape().assert_is_compatible_with(labels.get_shape())
losses = -tf.multiply(labels, tf.log(predictions + epsilon)) - tf.multiply(
(1 - labels), tf.log(1 - predictions + epsilon))
if weights is not None:
losses = tf.multiply(losses, weights)
return losses
def _smallest_size_at_least(height, width, smallest_side):
"""Computes new shape with the smallest side equal to `smallest_side`.
Computes new shape with the smallest side equal to `smallest_side` while
preserving the original aspect ratio.
Args:
height: an int32 scalar tensor indicating the current height.
width: an int32 scalar tensor indicating the current width.
smallest_side: A python integer or scalar `Tensor` indicating the size of
the smallest side after resize.
Returns:
new_height: an int32 scalar tensor indicating the new height.
new_width: and int32 scalar tensor indicating the new width.
"""
smallest_side = tf.convert_to_tensor(smallest_side, dtype=tf.int32)
height = tf.to_float(height)
width = tf.to_float(width)
smallest_side = tf.to_float(smallest_side)
scale = tf.cond(tf.greater(height, width),
lambda: smallest_side / width,
lambda: smallest_side / height)
new_height = tf.to_int32(height * scale)
new_width = tf.to_int32(width * scale)
return new_height, new_width
def while_step(t, rnn_state, tas, accs):
"""Implements one timestep of FIVO computation."""
log_weights_acc, log_p_hat_acc, kl_acc = accs
cur_inputs, cur_mask = nested.read_tas([inputs_ta, mask_ta], t)
# Run the cell for one step.
log_q_z, log_p_z, log_p_x_given_z, kl, new_state = cell(
cur_inputs,
rnn_state,
cur_mask,
)
# Compute the incremental weight and use it to update the current
# accumulated weight.
kl_acc += kl * cur_mask
log_alpha = (log_p_x_given_z + log_p_z - log_q_z) * cur_mask
log_alpha = tf.reshape(log_alpha, [num_samples, batch_size])
log_weights_acc += log_alpha
# Calculate the effective sample size.
ess_num = 2 * tf.reduce_logsumexp(log_weights_acc, axis=0)
ess_denom = tf.reduce_logsumexp(2 * log_weights_acc, axis=0)
log_ess = ess_num - ess_denom
# Calculate the ancestor indices via resampling. Because we maintain the
# log unnormalized weights, we pass the weights in as logits, allowing
# the distribution object to apply a softmax and normalize them.
resampling_dist = tf.contrib.distributions.Categorical(
logits=tf.transpose(log_weights_acc, perm=[1, 0]))
ancestor_inds = tf.stop_gradient(
resampling_dist.sample(sample_shape=num_samples, seed=random_seed))
# Because the batch is flattened and laid out as discussed
# above, we must modify ancestor_inds to index the proper samples.
# The particles in the ith filter are distributed every batch_size rows
# in the batch, and offset i rows from the top. So, to correct the indices
# we multiply by the batch_size and add the proper offset. Crucially,
# when ancestor_inds is flattened the layout of the batch is maintained.
offset = tf.expand_dims(tf.range(batch_size), 0)
ancestor_inds = tf.reshape(ancestor_inds * batch_size + offset, [-1])
noresample_inds = tf.range(num_samples * batch_size)
# Decide whether or not we should resample; don't resample if we are past
# the end of a sequence.
should_resample = resampling_criterion(num_samples, log_ess, t)
should_resample = tf.logical_and(should_resample,
cur_mask[:batch_size] > 0.)
float_should_resample = tf.to_float(should_resample)
ancestor_inds = tf.where(
tf.tile(should_resample, [num_samples]),
ancestor_inds,
noresample_inds)
new_state = nested.gather_tensors(new_state, ancestor_inds)
# Update the TensorArrays before we reset the weights so that we capture
# the incremental weights and not zeros.
ta_updates = [log_weights_acc, log_ess, float_should_resample]
new_tas = [ta.write(t, x) for ta, x in zip(tas, ta_updates)]
# For the particle filters that resampled, update log_p_hat and
# reset weights to zero.
log_p_hat_update = tf.reduce_logsumexp(
log_weights_acc, axis=0) - tf.log(tf.to_float(num_samples))
log_p_hat_acc += log_p_hat_update * float_should_resample
log_weights_acc *= (1. - tf.tile(float_should_resample[tf.newaxis, :],
[num_samples, 1]))
new_accs = (log_weights_acc, log_p_hat_acc, kl_acc)
return t + 1, new_state, new_tas, new_accs
def summarize(self):
"""Summarize the number of positives and negatives after mining."""
if self._num_positives_list and self._num_negatives_list:
avg_num_positives = tf.reduce_mean(tf.to_float(self._num_positives_list))
avg_num_negatives = tf.reduce_mean(tf.to_float(self._num_negatives_list))
tf.summary.scalar('HardExampleMiner/NumPositives', avg_num_positives)
tf.summary.scalar('HardExampleMiner/NumNegatives', avg_num_negatives)
def preprocess_for_test(image, gt_boxes, gt_masks):
ih, iw = tf.shape(image)[0], tf.shape(image)[1]
## min size resizing
new_ih, new_iw = preprocess_utils._smallest_size_at_least(ih, iw, cfg.FLAGS.image_min_size)
image = tf.expand_dims(image, 0)
image = tf.image.resize_bilinear(image, [new_ih, new_iw], align_corners=False)
image = tf.squeeze(image, axis=[0])
gt_masks = tf.expand_dims(gt_masks, -1)
gt_masks = tf.cast(gt_masks, tf.float32)
gt_masks = tf.image.resize_nearest_neighbor(gt_masks, [new_ih, new_iw], align_corners=False)
gt_masks = tf.cast(gt_masks, tf.int32)
gt_masks = tf.squeeze(gt_masks, axis=[-1])
scale_ratio = tf.to_float(new_ih) / tf.to_float(ih)
gt_boxes = preprocess_utils.resize_gt_boxes(gt_boxes, scale_ratio)
## zero mean image
image = tf.cast(image, tf.float32)
image = image / 256.0
image = (image - 0.5) * 2.0
image = tf.expand_dims(image, axis=0)
## rgb to bgr
image = tf.reverse(image, axis=[-1])
return image, gt_boxes, gt_masks
def mask_probs(probs, eos_token, finished):
"""Masks log probabilities such that finished beams
allocate all probability mass to eos. Unfinished beams remain unchanged.
Args:
probs: Log probabiltiies of shape `[beam_width, vocab_size]`
eos_token: An int32 id corresponding to the EOS token to allocate
probability to
finished: A boolean tensor of shape `[beam_width]` that specifies which
elements in the beam are finished already.
Returns:
A tensor of shape `[beam_width, vocab_size]`, where unfinished beams
stay unchanged and finished beams are replaced with a tensor that has all
probability on the EOS token.
"""
vocab_size = tf.shape(probs)[1]
finished_mask = tf.expand_dims(tf.to_float(1. - tf.to_float(finished)), 1)
# These examples are not finished and we leave them
non_finished_examples = finished_mask * probs
# All finished examples are replaced with a vector that has all
# probability on EOS
finished_row = tf.one_hot(
eos_token,
vocab_size,
dtype=tf.float32,
on_value=0.,
off_value=tf.float32.min)
finished_examples = (1. - finished_mask) * finished_row
return finished_examples + non_finished_examples
def __init__(self, env, hidden_size, entcoeff=0.001, lr_rate=1e-3, scope="adversary"):
self.scope = scope
self.observation_shape = env.observation_space.shape
self.actions_shape = env.action_space.shape
self.input_shape = tuple([o+a for o, a in zip(self.observation_shape, self.actions_shape)])
self.num_actions = env.action_space.shape[0]
self.hidden_size = hidden_size
self.build_ph()
# Build grpah
generator_logits = self.build_graph(self.generator_obs_ph, self.generator_acs_ph, reuse=False)
expert_logits = self.build_graph(self.expert_obs_ph, self.expert_acs_ph, reuse=True)
# Build accuracy
generator_acc = tf.reduce_mean(tf.to_float(tf.nn.sigmoid(generator_logits) < 0.5))
expert_acc = tf.reduce_mean(tf.to_float(tf.nn.sigmoid(expert_logits) > 0.5))
# Build regression loss
# let x = logits, z = targets.
# z * -log(sigmoid(x)) + (1 - z) * -log(1 - sigmoid(x))
generator_loss = tf.nn.sigmoid_cross_entropy_with_logits(logits=generator_logits, labels=tf.zeros_like(generator_logits))
generator_loss = tf.reduce_mean(generator_loss)
expert_loss = tf.nn.sigmoid_cross_entropy_with_logits(logits=expert_logits, labels=tf.ones_like(expert_logits))
expert_loss = tf.reduce_mean(expert_loss)
# Build entropy loss
logits = tf.concat([generator_logits, expert_logits], 0)
entropy = tf.reduce_mean(logit_bernoulli_entropy(logits))
entropy_loss = -entcoeff*entropy
# Loss + Accuracy terms
self.losses = [generator_loss, expert_loss, entropy, entropy_loss, generator_acc, expert_acc]
self.loss_name = ["generator_loss", "expert_loss", "entropy", "entropy_loss", "generator_acc", "expert_acc"]
self.total_loss = generator_loss + expert_loss + entropy_loss
# Build Reward for policy
self.reward_op = -tf.log(1-tf.nn.sigmoid(generator_logits)+1e-8)
var_list = self.get_trainable_variables()
self.lossandgrad = U.function([self.generator_obs_ph, self.generator_acs_ph, self.expert_obs_ph, self.expert_acs_ph],
self.losses + [U.flatgrad(self.total_loss, var_list)])
def logistic_loss(prediction, label):
""" Logistic loss function averaged over pixels in the breast area.
Pixels in the background are ignored.
Args:
prediction: A 2D tensor of floats. The predicted heatmap of logits.
label: A 2D tensor of integers. Possible labels are 0 (background), 127
(breast tissue) and 255 (breast mass).
Returns:
A float. The loss.
"""
with tf.name_scope('logistic_loss'):
# Generate binary masks.
mass = tf.to_float(tf.equal(label, 255))
breast_area = tf.to_float(tf.greater(label, 0))
# Compute loss per pixel
pixel_loss = tf.nn.sigmoid_cross_entropy_with_logits(prediction, mass)
# Weight the errors (1 for pixels in breast area, zero otherwise)
weighted_loss = tf.mul(pixel_loss, breast_area)
# Average over pixels in the breast area
loss = tf.reduce_sum(weighted_loss)/tf.reduce_sum(breast_area)
return loss
def testLSTMCellReparameterization(
self, kernel_initializer, recurrent_initializer, bias_initializer,
all_close):
batch_size, timesteps, dim = 5, 3, 12
hidden_size = 10
inputs = tf.to_float(np.random.rand(batch_size, timesteps, dim))
cell = bayes.LSTMCellReparameterization(
hidden_size, kernel_initializer=kernel_initializer,
recurrent_initializer=recurrent_initializer,
bias_initializer=bias_initializer)
noise = tf.to_float(np.random.rand(1, hidden_size))
h0, c0 = cell.get_initial_state(inputs)
state = (h0 + noise, c0)
outputs1, _ = cell(inputs[:, 0, :], state)
outputs2, _ = cell(inputs[:, 0, :], state)
cell.sample_weights()
outputs3, _ = cell(inputs[:, 0, :], state)
self.evaluate(tf.global_variables_initializer())
res1, res2, res3 = self.evaluate([outputs1, outputs2, outputs3])
self.assertEqual(res1.shape, (batch_size, hidden_size))
self.assertAllClose(res1, res2)
if all_close:
self.assertAllClose(res1, res3)
else:
self.assertNotAllClose(res1, res3)
cell.get_config()
def _scale(x):
min_x_valuef = tf.to_float(min_x_value)
max_x_valuef = tf.to_float(max_x_value)
output_minf = tf.to_float(output_min)
output_maxf = tf.to_float(output_max)
return ((((tf.to_float(x) - min_x_valuef) * (output_maxf - output_minf)) /
(max_x_valuef - min_x_valuef)) + output_minf)
def total_variation_loss(stylized_inputs, total_variation_weight):
"""Total variation regularization loss.
This loss improves the smoothness of the image by expressing high frequency
variations as a loss.
http://link.springer.com/article/10.1023/B:JMIV.0000011325.36760.1e
Args:
stylized_inputs: The batched set of images.
total_variation_weight: Weight of total variation loss.
Returns:
Tensor for the total variation loss, dict mapping loss names to losses.
"""
shape = tf.shape(stylized_inputs)
batch_size = shape[0]
height = shape[1]
width = shape[2]
channels = shape[3]
y_size = tf.to_float((height - 1) * width * channels)
x_size = tf.to_float(height * (width - 1) * channels)
y_loss = tf.nn.l2_loss(
stylized_inputs[:, 1:, :, :] - stylized_inputs[:, :-1, :, :]) / y_size
x_loss = tf.nn.l2_loss(
stylized_inputs[:, :, 1:, :] - stylized_inputs[:, :, :-1, :]) / x_size
loss = (y_loss + x_loss) / tf.to_float(batch_size)
weighted_loss = loss * total_variation_weight
return weighted_loss, {
'total_variation_loss': loss,
'weighted_total_variation_loss': weighted_loss
}
def compute_metrics(output_video, target_video):
max_pixel_value = 255.0
output_video = tf.to_float(output_video)
target_video = tf.to_float(target_video)
psnr = tf.image.psnr(output_video, target_video, max_pixel_value)
ssim = tf.image.ssim(output_video, target_video, max_pixel_value)
return {"PSNR": psnr, "SSIM": ssim}
def f_conf_loss(s_out, match, timespan, use_cum_min=True):
"""Loss function for confidence score sequence.
Args:
s_out:
match:
use_cum_min:
"""
s_out_shape = tf.shape(s_out)
num_ex = tf.to_float(s_out_shape[0])
max_num_obj = tf.to_float(s_out_shape[1])
match_sum = tf.reduce_sum(match, reduction_indices=[2])
# Loss for confidence scores.
if use_cum_min:
# [B, N]
s_out_min = f_cum_min(s_out, timespan)
s_out_max = f_cum_max(s_out, timespan)
# [B, N]
s_bce = f_bce_minmax(s_out_min, s_out_max, match_sum)
else:
s_bce = f_bce(s_out, match_sum)
loss = tf.reduce_sum(s_bce) / num_ex / max_num_obj
return loss
def total_variation_loss(layer):
shape = tf.shape(layer)
height = shape[1]
width = shape[2]
y = tf.slice(layer, [0,0,0,0], tf.pack([-1,height-1,-1,-1])) - tf.slice(layer, [0,1,0,0], [-1,-1,-1,-1])
x = tf.slice(layer, [0,0,0,0], tf.pack([-1,-1,width-1,-1])) - tf.slice(layer, [0,0,1,0], [-1,-1,-1,-1])
return tf.nn.l2_loss(x) / tf.to_float(tf.size(x)) + tf.nn.l2_loss(y) / tf.to_float(tf.size(y))
def _get_sampling_probability(hparams, is_training):
"""Returns `sampling_probabiliy` if `sampling schedule` given or 0."""
if (not hasattr(hparams, 'sampling_schedule') or
not hparams.sampling_schedule):
return tf.convert_to_tensor(0.0, tf.float32)
if not is_training:
# This is likely an eval/test job associated with a training job using
# scheduled sampling.
tf.logging.warning(
'Setting non-training sampling schedule from %s:%f to constant:1.0.',
hparams.sampling_schedule, hparams.sampling_rate)
hparams.sampling_schedule = 'constant'
hparams.sampling_rate = 1.0
if hparams.sampling_schedule == 'constant':
sampling_probability = tf.constant(hparams.sampling_rate)
elif hparams.sampling_schedule == 'inverse_sigmoid':
k = tf.constant(hparams.sampling_rate)
sampling_probability = 1.0 - (
k / (k + tf.exp(tf.to_float(tf.train.get_or_create_global_step()) / k)))
elif hparams.sampling_schedule == 'exponential':
if not 0 < hparams.sampling_rate < 1:
raise ValueError(
'Exponential sampling rate must be in the interval (0, 1). Got %f.'
% hparams.sampling_rate)
k = tf.constant(hparams.sampling_rate)
sampling_probability = (
1.0 - tf.pow(k, tf.to_float(tf.train.get_or_create_global_step())))
else:
tf.logging.fatal('Invalid sampling_schedule: %s',
hparams.sampling_schedule)
tf.summary.scalar('sampling_probability', sampling_probability)
return tf.convert_to_tensor(sampling_probability, tf.float32)
def f_iou_box(top_left_a, bot_right_a, top_left_b, bot_right_b):
"""Computes IoU of boxes.
Args:
top_left_a: [B, T, 2] or [B, 2]
bot_right_a: [B, T, 2] or [B, 2]
top_left_b: [B, T, 2] or [B, 2]
bot_right_b: [B, T, 2] or [B, 2]
Returns:
iou: [B, T]
"""
inter_area = f_inter_box(top_left_a, bot_right_a, top_left_b, bot_right_b)
inter_area = tf.maximum(inter_area, 1e-6)
ndims = tf.shape(tf.shape(top_left_a))
# area_a = tf.reduce_prod(bot_right_a - top_left_a, ndims - 1)
# area_b = tf.reduce_prod(bot_right_b - top_left_b, ndims - 1)
check_a = tf.reduce_prod(tf.to_float(top_left_a < bot_right_a), ndims - 1)
area_a = check_a * tf.reduce_prod(bot_right_a - top_left_a, ndims - 1)
check_b = tf.reduce_prod(tf.to_float(top_left_b < bot_right_b), ndims - 1)
area_b = check_b * tf.reduce_prod(bot_right_b - top_left_b, ndims - 1)
union_area = (area_a + area_b - inter_area + 1e-5)
union_area = tf.maximum(union_area, 1e-5)
iou = inter_area / union_area
iou = tf.maximum(iou, 1e-5)
iou = tf.minimum(iou, 1.0)
return iou
def testBayesianLinearModel(self):
"""Tests that model makes reasonable predictions."""
np.random.seed(42)
train_batch_size = 5
test_batch_size = 2
num_features = 3
noise_variance = 0.01
coeffs = tf.range(num_features, dtype=tf.float32)
features = tf.to_float(np.random.randn(train_batch_size, num_features))
labels = (tf.tensordot(features, coeffs, [[-1], [0]])
+ noise_variance * tf.to_float(np.random.randn(train_batch_size)))
model = bayes.BayesianLinearModel(noise_variance=noise_variance)
model.fit(features, labels)
test_features = tf.to_float(np.random.randn(test_batch_size, num_features))
test_labels = tf.tensordot(test_features, coeffs, [[-1], [0]])
outputs = model(test_features)
test_predictions = outputs.distribution.mean()
test_predictions_variance = outputs.distribution.variance()
[
test_labels_val, test_predictions_val, test_predictions_variance_val,
] = self.evaluate(
[test_labels, test_predictions, test_predictions_variance])
self.assertEqual(test_predictions_val.shape, (test_batch_size,))
self.assertEqual(test_predictions_variance_val.shape, (test_batch_size,))
self.assertAllClose(test_predictions_val, test_labels_val, atol=0.1)
self.assertAllLessEqual(test_predictions_variance_val, noise_variance)
from __future__ import print_function
import tensorflow as tf
import numpy as np
import time
from gaussian_log import NormalWithLogScale
EPSILON = 1e-9
step_size = 2
height, width = 6, 9
meshgrid = tf.to_float(tf.meshgrid(tf.range(width), tf.range(height - 1, -1, -1)))
print(meshgrid.get_shape())
# hidden_map = np.random.operator((map_height, map_width), maxval=10)
hidden_map = np.random.randint(0, 9, size=(step_size, height, width))
print('map')
print(hidden_map)
hidden_map = tf.constant(hidden_map, dtype=tf.float32)
lidar_size = 6
lidar = np.random.randint(0, 9, size=(step_size, 2, lidar_size)).astype(np.float32)
alpha = tf.ones((step_size, height, width))
with tf.Session() as sess:
def print_val(x, f=None, name=None):
if type(x) is str:
print(x + ': ')
x = eval(x)
val = sess.run(x)
if name is not None:
print(name + ': ')
if f is None:
def get_dropout(self, dropout_rate, is_training): return 1 - (tf.to_float(is_training) * dropout_rate)
def features_to_nonpadding(features, inputs_or_targets="inputs"):
key = inputs_or_targets + "_segmentation"
if features and key in features:
return tf.minimum(tf.to_float(features[key]), 1.0)
return None
def train_confusion_fn():
train_confusion = tf.confusion_matrix(tf.argmax(y_train, 1), tf.argmax(logit_train, 1))
train_confusion = tf.to_float(train_confusion) / tf.constant(
(logit_train.shape.as_list()[0] / float(logit_train.shape.as_list()[1])), dtype=tf.float32)
train_confusion = tf.expand_dims(tf.expand_dims(train_confusion, 0), 3)
return train_confusion
def build_model(self):
# build index table
index_table = tf.contrib.lookup.index_table_from_file(
vocabulary_file=self.config.vocab_list,
num_oov_buckets=0,
default_value=0)
# get data iterator
self.data_iterator = self.data.get_data_iterator(index_table,
mode=self.mode)
# get inputs
with tf.variable_scope("inputs"):
# get next batch if there is no feeded data
next_batch = self.data_iterator.get_next()
self.input_queries = tf.placeholder_with_default(
next_batch["input_queries"], [None, self.config.max_length],
name="input_queries")
self.input_replies = tf.placeholder_with_default(
next_batch["input_replies"], [None, self.config.max_length],
name="input_replies")
self.query_lengths = tf.placeholder_with_default(
tf.squeeze(next_batch["query_lengths"]), [None],
name="query_lengths")
self.reply_lengths = tf.placeholder_with_default(
tf.squeeze(next_batch["reply_lengths"]), [None],
name="reply_lengths")
# get hyperparams
self.embed_dropout_keep_prob = tf.placeholder(
tf.float32, name="embed_dropout_keep_prob")
self.lstm_dropout_keep_prob = tf.placeholder(
tf.float32, name="lstm_dropout_keep_prob")
self.num_negative_samples = tf.placeholder(
tf.int32, name="num_negative_samples")
self.add_echo = tf.placeholder(tf.bool, name="add_echo")
with tf.variable_scope("properties"):
# length properties
cur_batch_length = tf.shape(self.input_queries)[0]
query_max_length = tf.shape(self.input_queries)[1]
reply_max_length = tf.shape(self.input_replies)[1]
# learning rate and optimizer
learning_rate = tf.train.exponential_decay(
self.config.learning_rate,
self.global_step_tensor,
decay_steps=100000,
decay_rate=0.9)
self.optimizer = tf.train.AdamOptimizer(learning_rate)
# embedding layer
with tf.variable_scope("embedding"):
embeddings = tf.Variable(get_embeddings(
self.config.vocab_list, self.config.pretrained_embed_dir,
self.config.vocab_size, self.config.embed_dim),
trainable=True,
name="embeddings")
queries_embedded = tf.to_float(
tf.nn.embedding_lookup(embeddings,
self.input_queries,
name="queries_embedded"))
replies_embedded = tf.to_float(
tf.nn.embedding_lookup(embeddings,
self.input_replies,
name="replies_embedded"))
# build LSTM layer
with tf.variable_scope("lstm_layer") as vs:
query_lstm_cell = tf.nn.rnn_cell.LSTMCell(
self.config.lstm_dim,
forget_bias=2.0,
use_peepholes=True,
state_is_tuple=True,
# initializer=tf.orthogonal_initializer(),
)
query_lstm_cell = tf.contrib.rnn.DropoutWrapper(
query_lstm_cell, input_keep_prob=self.lstm_dropout_keep_prob)
reply_lstm_cell = tf.nn.rnn_cell.LSTMCell(
self.config.lstm_dim,
forget_bias=2.0,
use_peepholes=True,
state_is_tuple=True,
# initializer=tf.orthogonal_initializer(),
reuse=True)
reply_lstm_cell = tf.contrib.rnn.DropoutWrapper(
reply_lstm_cell, input_keep_prob=self.lstm_dropout_keep_prob)
_, queries_encoded = tf.nn.dynamic_rnn(
cell=query_lstm_cell,
inputs=queries_embedded,
sequence_length=tf.cast(self.query_lengths, tf.float32),
dtype=tf.float32,
)
_, replies_encoded = tf.nn.dynamic_rnn(
cell=reply_lstm_cell,
inputs=replies_embedded,
sequence_length=tf.cast(self.reply_lengths, tf.float32),
dtype=tf.float32,
)
_, echo_encoded = tf.nn.dynamic_rnn(
cell=reply_lstm_cell,
inputs=queries_embedded,
sequence_length=tf.cast(tf.squeeze(self.query_lengths),
tf.float32),
dtype=tf.float32)
self.queries_encoded = tf.cast(queries_encoded.h, tf.float64)
self.replies_encoded = tf.cast(replies_encoded.h, tf.float64)
self.echo_encoded = tf.cast(echo_encoded.h, tf.float64)
# build dense layer
with tf.variable_scope("dense_layer"):
M = tf.get_variable(
"M",
shape=[self.config.lstm_dim, self.config.lstm_dim],
initializer=tf.initializers.truncated_normal())
self.queries_encoded = tf.matmul(self.queries_encoded,
tf.cast(M, tf.float64))
with tf.variable_scope("sampling"):
self.distances = tf.matmul(self.queries_encoded,
self.replies_encoded,
transpose_b=True)
self.echo_distances = tf.matmul(self.queries_encoded,
self.echo_encoded,
transpose_b=True)
positive_mask = tf.reshape(tf.eye(cur_batch_length), [-1])
negative_mask = tf.reshape(
make_negative_mask(
self.distances,
method=self.config.negative_sampling,
num_negative_samples=self.num_negative_samples), [-1])
with tf.variable_scope("prediction"):
distances_flattened = tf.reshape(self.distances, [-1])
echo_distances_flattened = tf.reshape(self.echo_distances, [-1])
self.positive_logits = tf.gather(distances_flattened,
tf.where(positive_mask), 1)
self.negative_logits = tf.gather(distances_flattened,
tf.where(negative_mask), 1)
self.echo_logits = tf.gather(echo_distances_flattened,
tf.where(positive_mask), 1)
self.logits = tf.cond(
self.add_echo, lambda: tf.concat([
self.positive_logits, self.negative_logits, self.
echo_logits
],
axis=0),
lambda: tf.concat([self.positive_logits, self.negative_logits],
axis=0))
self.labels = tf.cond(
self.add_echo, lambda: tf.concat([
tf.ones_like(self.positive_logits),
tf.zeros_like(self.negative_logits),
tf.zeros_like(self.echo_logits)
],
axis=0),
lambda: tf.concat([
tf.ones_like(self.positive_logits),
tf.zeros_like(self.negative_logits)
],
axis=0))
self.positive_probs = tf.sigmoid(self.positive_logits)
self.echo_probs = tf.sigmoid(self.echo_logits)
self.probs = tf.sigmoid(self.logits)
self.predictions = tf.cast(self.probs > 0.5, dtype=tf.int32)
with tf.variable_scope("loss"):
self.loss = tf.reduce_mean(
tf.nn.sigmoid_cross_entropy_with_logits(labels=self.labels,
logits=self.logits))
# gvs = self.optimizer.compute_gradients(self.loss)
# capped_gvs = [(tf.clip_by_norm(grad, 5), var) for grad, var in gvs]
# self.train_step = self.optimizer.apply_gradients(capped_gvs)
self.train_step = self.optimizer.minimize(self.loss)
with tf.variable_scope("score"):
correct_predictions = tf.equal(self.predictions,
tf.to_int32(self.labels))
self.accuracy = tf.reduce_mean(tf.cast(correct_predictions,
"float"),
name="accuracy")
def box_voting(selected_boxes, pool_boxes, iou_thresh=0.5):
"""Performs box voting as described in S. Gidaris and N. Komodakis, ICCV 2015.
Performs box voting as described in 'Object detection via a multi-region &
semantic segmentation-aware CNN model', Gidaris and Komodakis, ICCV 2015. For
each box 'B' in selected_boxes, we find the set 'S' of boxes in pool_boxes
with iou overlap >= iou_thresh. The location of B is set to the weighted
average location of boxes in S (scores are used for weighting). And the score
of B is set to the average score of boxes in S.
Args:
selected_boxes: BoxList containing a subset of boxes in pool_boxes. These
boxes are usually selected from pool_boxes using non max suppression.
pool_boxes: BoxList containing a set of (possibly redundant) boxes.
iou_thresh: (float scalar) iou threshold for matching boxes in
selected_boxes and pool_boxes.
Returns:
BoxList containing averaged locations and scores for each box in
selected_boxes.
Raises:
ValueError: if
a) selected_boxes or pool_boxes is not a BoxList.
b) if iou_thresh is not in [0, 1].
c) pool_boxes does not have a scores field.
"""
if not 0.0 <= iou_thresh <= 1.0:
raise ValueError('iou_thresh must be between 0 and 1')
if not isinstance(selected_boxes, box_list.BoxList):
raise ValueError('selected_boxes must be a BoxList')
if not isinstance(pool_boxes, box_list.BoxList):
raise ValueError('pool_boxes must be a BoxList')
if not pool_boxes.has_field('scores'):
raise ValueError('pool_boxes must have a \'scores\' field')
iou_ = iou(selected_boxes, pool_boxes)
match_indicator = tf.to_float(tf.greater(iou_, iou_thresh))
num_matches = tf.reduce_sum(match_indicator, 1)
# TODO: Handle the case where some boxes in selected_boxes do not
# match to any boxes in pool_boxes. For such boxes without any matches, we
# should return the original boxes without voting.
match_assert = tf.Assert(
tf.reduce_all(tf.greater(num_matches, 0)),
['Each box in selected_boxes must match with at least one box '
'in pool_boxes.'])
scores = tf.expand_dims(pool_boxes.get_field('scores'), 1)
scores_assert = tf.Assert(
tf.reduce_all(tf.greater_equal(scores, 0)),
['Scores must be non negative.'])
with tf.control_dependencies([scores_assert, match_assert]):
sum_scores = tf.matmul(match_indicator, scores)
averaged_scores = tf.reshape(sum_scores, [-1]) / num_matches
box_locations = tf.matmul(match_indicator,
pool_boxes.get() * scores) / sum_scores
averaged_boxes = box_list.BoxList(box_locations)
_copy_extra_fields(averaged_boxes, selected_boxes)
averaged_boxes.add_field('scores', averaged_scores)
return averaged_boxes
def main():
# my_netwokr = siamese_network()
#
# print("djkfljdkd")
# d = Dataset(mnist_data_train_images, mnist_data_train_labels)
#
# img_l, img_r, l = d._get_siamese_batch(10)
left = tf.placeholder(dtype=tf.float32, shape=[None, 784], name="left")
right = tf.placeholder(dtype=tf.float32, shape=[None, 784], name="right")
l_img = tf.reshape(left, shape=[-1, 28, 28, 1], name="l_img")
r_img = tf.reshape(right, shape=[-1, 28, 28, 1], name="r_img")
with tf.name_scope("similarity"):
# label = tf.placeholder(tf.int64, [None, 1], name='label') # 1 if same, 0 if different
label = tf.placeholder(tf.int64, [None],
name='label') # 1 if same, 0 if different
label_float = tf.to_float(label)
margin = 0.5
with tf.variable_scope("siamese") as scope:
left_output = mnist_model(l_img)
scope.reuse_variables()
right_output = mnist_model(r_img)
# loss = contrastive_loss(left_output, right_output, label_float, margin)
loss = loss_with_spring(left_output, right_output, label_float)
tf.summary.scalar("loss", loss)
# Setup Optimizer
global_step = tf.Variable(0, trainable=False)
train_step = tf.train.AdamOptimizer(1.e-5).minimize(loss)
saver = tf.train.Saver()
merged = tf.summary.merge_all()
with tf.Session() as sess:
sess.run(tf.global_variables_initializer())
# setup tensorboard
tf.summary.scalar('step', global_step)
tf.summary.scalar('loss', loss)
writer = tf.summary.FileWriter('train.log', sess.graph)
train_data_set = Dataset(mnist_data_train_images,
mnist_data_train_labels)
test_data_set = Dataset(mnist_data_test_images, mnist_data_test_labels)
for i in range(50000):
l_imgs, r_imgs, lbs = train_data_set._get_siamese_batch(10)
batch_x1, batch_y1 = mnist.train.next_batch(128)
batch_x2, batch_y2 = mnist.train.next_batch(128)
batch_y = (batch_y1 == batch_y2).astype('float')
# print("jdkfjlsd")
# id = 0
# for _ in range(10):
# plt.subplot(2, 10, id + 1)
# plt.imshow(l_imgs[id, :].reshape((28, 28)))
#
# plt.subplot(2, 10, 10 + id + 1)
# plt.imshow(r_imgs[id, :].reshape((28, 28)))
# plt.title(str(lbs[id]))
# id += 1
#
# plt.show()
# print("djkfljd")
_, l, merged_sum = sess.run([train_step, loss, merged],
feed_dict={
left: batch_x1,
right: batch_x2,
label: batch_y
})
writer.add_summary(merged_sum, i)
if i % 1000 == 0:
# l_imgs, r_imgs, lbs = test_data_set._get_siamese_batch(100)
# l = sess.run([loss], feed_dict={left: l_imgs,
# right: r_imgs,
# label: lbs})
print("epoch: {}, error: {}".format(i, l))
def bicond_reader_embedded(placeholders,
inputs_embedded,
emb_dim,
drop_keep_prob=1.0):
"""
Performs the same function as the bicond_reader function but works on inputs that have already been embedded by the
embedding lookup op
:param placeholders: dict containing tensorflow placeholders
:param inputs_embedded: Inputs to the reader after already having passed through the embedding lookup ops
:param emb_dim: word embedding dimension
:param drop_keep_prob: keep probability for dropout
:return: score (unscaled logits), loss and prediction (normalised logits (softmax)) tensorflow ops
"""
# [batch_size, candidate_size]
targets = tf.to_float(placeholders['targets'])
question_embedded = inputs_embedded['question_embedded']
support_embedded = inputs_embedded['support_embedded']
candidates_embedded = inputs_embedded['candidates_embedded']
dim1s, dim2s, dim3s, dim4s = tf.unstack(
tf.shape(support_embedded
)) # [batch_size, num_supports, max_seq2_length, emb_dim]
# iterate through all supports
num_steps = dim2s
initial_outputs = tf.TensorArray(size=num_steps, dtype='float32')
initial_i = tf.constant(0, dtype='int32')
# question_encoding = tf.reduce_sum(question_embedded, 1)
with tf.variable_scope("conditional_reader_seq1") as varscope1:
# seq1_states: (c_fw, h_fw), (c_bw, h_bw)
_, seq1_states = reader(question_embedded,
placeholders['question_lengths'],
emb_dim,
scope=varscope1,
drop_keep_prob=drop_keep_prob)
def should_continue(i, *args):
# execute the loop for all i supports
return i < num_steps
def iteration(i, outputs_):
# get all instances, take only i-th support, flatten so this becomes a 3-dim tensor
sup_batchi = tf.reshape(
tf.slice(support_embedded, [0, i, 0, 0], [dim1s, 1, dim3s, dim4s]),
[dim1s, dim3s, emb_dim
]) # [batch_size, num_supports, max_seq2_length, emb_dim]
sup_lens_batchi = tf.reshape(
tf.slice(placeholders['support_lengths'], [0, i], [dim1s, 1]),
[-1]) # [batch_size]
with tf.variable_scope("conditional_reader_seq2") as varscope2:
varscope1.reuse_variables()
# each [batch_size x max_seq_length x output_size]
outputs, states = reader(sup_batchi,
sup_lens_batchi,
emb_dim,
seq1_states,
scope=varscope2,
drop_keep_prob=drop_keep_prob)
output = tf.concat(axis=1, values=[states[0][1], states[1][1]])
# squish back into emb_dim num dimensions
output = tf.contrib.layers.linear(output, emb_dim)
# batch matrix multiplication to get per-candidate scores
scores = tf.einsum('bid,bcd->bc', tf.expand_dims(output, 1),
candidates_embedded)
# append scores for the i-th support to previous supports so we can combine scores for all supports later
outputs_ = outputs_.write(i, scores)
return i + 1, outputs_
i, outputs = tf.while_loop(should_continue, iteration,
[initial_i, initial_outputs])
# packs along axis 0, there doesn't seem to be a way to change that (?)
outputs_logits = outputs.stack() # [num_support, batch_size, num_cands]
scores = tf.reduce_sum(outputs_logits, 0)
loss = tf.nn.softmax_cross_entropy_with_logits(logits=scores,
labels=targets)
predict = tf.nn.softmax(scores)
return scores, loss, predict
variance_dis = tf.abs(t1_var - t2_var)
return variance_dis
def distance(t1, t2):
k = 1.0
delta = 3.0
return tf.reduce_mean(tf.exp(k * tf.abs(t1 - t2) + delta) - tf.exp(delta) , [1,2,3])
sess = tf.Session()
dark_pipe = SimplePipeline(batch_size, 1, 0, dark_img_dir)
gt_pipe = SimplePipeline(batch_size, 1, 0, gt_img_dir)
daliop = dali_tf.DALIIterator()
in_image= daliop(pipeline = dark_pipe, shapes=[[batch_size,400,600,3]],dtypes=[tf.uint8])
in_image=tf.to_float(in_image[0])/255.0
gt_image= daliop(pipeline = gt_pipe, shapes=[[batch_size,400,600,3]],dtypes=[tf.uint8])
gt_image=tf.to_float(gt_image[0])/255.0
print(in_image,gt_image)
input_patches, gt_patches = generate_batch(patches_num, in_image, gt_image)
output_patches = network(input_patches)
out_max = tf.reduce_max(output_patches)
out_min = tf.reduce_min(output_patches)
out_image = network(in_image[0:1,:,:,:])[0,:,:,:]
debug_in = tf.reduce_mean(in_image[0:1,:,:,:])
o_debug = tf.reduce_mean(output_patches)
o_img_debug = tf.reduce_mean(out_image)
def get_model_learning_rate(learning_policy,
base_learning_rate,
learning_rate_decay_step,
learning_rate_decay_factor,
training_number_of_steps,
learning_power,
slow_start_step,
slow_start_learning_rate,
slow_start_burnin_type='none',
decay_steps=0.0,
end_learning_rate=1e-6,
boundaries=None,
boundary_learning_rates=None):
"""Gets model's learning rate.
Computes the model's learning rate for different learning policy.
Right now, only "step" and "poly" are supported.
(1) The learning policy for "step" is computed as follows:
current_learning_rate = base_learning_rate *
learning_rate_decay_factor ^ (global_step / learning_rate_decay_step)
See tf.train.exponential_decay for details.
(2) The learning policy for "poly" is computed as follows:
current_learning_rate = base_learning_rate *
(1 - global_step / training_number_of_steps) ^ learning_power
Args:
learning_policy: Learning rate policy for training.
base_learning_rate: The base learning rate for model training.
learning_rate_decay_step: Decay the base learning rate at a fixed step.
learning_rate_decay_factor: The rate to decay the base learning rate.
training_number_of_steps: Number of steps for training.
learning_power: Power used for 'poly' learning policy.
slow_start_step: Training model with small learning rate for the first
few steps.
slow_start_learning_rate: The learning rate employed during slow start.
slow_start_burnin_type: The burnin type for the slow start stage. Can be
`none` which means no burnin or `linear` which means the learning rate
increases linearly from slow_start_learning_rate and reaches
base_learning_rate after slow_start_steps.
decay_steps: Float, `decay_steps` for polynomial learning rate.
end_learning_rate: Float, `end_learning_rate` for polynomial learning rate.
boundaries: A list of `Tensor`s or `int`s or `float`s with strictly
increasing entries.
boundary_learning_rates: A list of `Tensor`s or `float`s or `int`s that
specifies the values for the intervals defined by `boundaries`. It should
have one more element than `boundaries`, and all elements should have the
same type.
Returns:
Learning rate for the specified learning policy.
Raises:
ValueError: If learning policy or slow start burnin type is not recognized.
ValueError: If `boundaries` and `boundary_learning_rates` are not set for
multi_steps learning rate decay.
"""
global_step = tf.train.get_or_create_global_step()
adjusted_global_step = tf.maximum(global_step - slow_start_step, 0)
if decay_steps == 0.0:
tf.logging.info('Setting decay_steps to total training steps.')
decay_steps = training_number_of_steps - slow_start_step
if learning_policy == 'step':
learning_rate = tf.train.exponential_decay(base_learning_rate,
adjusted_global_step,
learning_rate_decay_step,
learning_rate_decay_factor,
staircase=True)
elif learning_policy == 'poly':
learning_rate = tf.train.polynomial_decay(
base_learning_rate,
adjusted_global_step,
decay_steps=decay_steps,
end_learning_rate=end_learning_rate,
power=learning_power)
elif learning_policy == 'cosine':
learning_rate = tf.train.cosine_decay(
base_learning_rate, adjusted_global_step,
training_number_of_steps - slow_start_step)
elif learning_policy == 'multi_steps':
if boundaries is None or boundary_learning_rates is None:
raise ValueError(
'Must set `boundaries` and `boundary_learning_rates` '
'for multi_steps learning rate decay.')
learning_rate = tf.train.piecewise_constant_decay(
adjusted_global_step, boundaries, boundary_learning_rates)
else:
raise ValueError('Unknown learning policy.')
adjusted_slow_start_learning_rate = slow_start_learning_rate
if slow_start_burnin_type == 'linear':
# Do linear burnin. Increase linearly from slow_start_learning_rate and
# reach base_learning_rate after (global_step >= slow_start_steps).
adjusted_slow_start_learning_rate = (
slow_start_learning_rate +
(base_learning_rate - slow_start_learning_rate) *
tf.to_float(global_step) / slow_start_step)
elif slow_start_burnin_type != 'none':
raise ValueError('Unknown burnin type.')
# Employ small learning rate at the first few steps for warm start.
return tf.where(global_step < slow_start_step,
adjusted_slow_start_learning_rate, learning_rate)
def get_loss(mask_label, center_label, \
heading_class_label, heading_residual_label, \
size_class_label, size_residual_label, \
end_points, \
corner_loss_weight=10.0, \
box_loss_weight=1.0):
''' Loss functions for 3D object detection.
Input:
mask_label: TF int32 tensor in shape (B,N)
center_label: TF tensor in shape (B,3)
heading_class_label: TF int32 tensor in shape (B,)
heading_residual_label: TF tensor in shape (B,)
size_class_label: TF tensor int32 in shape (B,)
size_residual_label: TF tensor tensor in shape (B,)
end_points: dict, outputs from our model
corner_loss_weight: float scalar
box_loss_weight: float scalar
Output:
total_loss: TF scalar tensor
the total_loss is also added to the losses collection
'''
# 3D Segmentation loss
mask_loss = tf.reduce_mean(tf.nn.sparse_softmax_cross_entropy_with_logits(\
logits=end_points['mask_logits'], labels=mask_label))
tf.summary.scalar('3d mask loss', mask_loss)
# Center regression losses
center_dist = tf.norm(center_label - end_points['center'], axis=-1)
center_loss = huber_loss(center_dist, delta=2.0)
tf.summary.scalar('center loss', center_loss)
stage1_center_dist = tf.norm(center_label - \
end_points['stage1_center'], axis=-1)
stage1_center_loss = huber_loss(stage1_center_dist, delta=1.0)
tf.summary.scalar('stage1 center loss', stage1_center_loss)
# Heading loss
heading_class_loss = tf.reduce_mean( \
tf.nn.sparse_softmax_cross_entropy_with_logits( \
logits=end_points['heading_scores'], labels=heading_class_label))
tf.summary.scalar('heading class loss', heading_class_loss)
hcls_onehot = tf.one_hot(heading_class_label,
depth=NUM_HEADING_BIN,
on_value=1,
off_value=0,
axis=-1) # BxNUM_HEADING_BIN
heading_residual_normalized_label = \
heading_residual_label / (np.pi/NUM_HEADING_BIN)
heading_residual_normalized_loss = huber_loss(tf.reduce_sum( \
end_points['heading_residuals_normalized']*tf.to_float(hcls_onehot), axis=1) - \
heading_residual_normalized_label, delta=1.0)
tf.summary.scalar('heading residual normalized loss',
heading_residual_normalized_loss)
# Size loss
size_class_loss = tf.reduce_mean( \
tf.nn.sparse_softmax_cross_entropy_with_logits( \
logits=end_points['size_scores'], labels=size_class_label))
tf.summary.scalar('size class loss', size_class_loss)
scls_onehot = tf.one_hot(size_class_label,
depth=NUM_SIZE_CLUSTER,
on_value=1,
off_value=0,
axis=-1) # BxNUM_SIZE_CLUSTER
scls_onehot_tiled = tf.tile(tf.expand_dims( \
tf.to_float(scls_onehot), -1), [1,1,3]) # BxNUM_SIZE_CLUSTERx3
predicted_size_residual_normalized = tf.reduce_sum( \
end_points['size_residuals_normalized']*scls_onehot_tiled, axis=[1]) # Bx3
mean_size_arr_expand = tf.expand_dims( \
tf.constant(g_mean_size_arr, dtype=tf.float32),0) # 1xNUM_SIZE_CLUSTERx3
mean_size_label = tf.reduce_sum( \
scls_onehot_tiled * mean_size_arr_expand, axis=[1]) # Bx3
size_residual_label_normalized = size_residual_label / mean_size_label
size_normalized_dist = tf.norm( \
size_residual_label_normalized - predicted_size_residual_normalized,
axis=-1)
size_residual_normalized_loss = huber_loss(size_normalized_dist, delta=1.0)
tf.summary.scalar('size residual normalized loss',
size_residual_normalized_loss)
# Corner loss
# We select the predicted corners corresponding to the
# GT heading bin and size cluster.
corners_3d = get_box3d_corners(
end_points['center'], end_points['heading_residuals'],
end_points['size_residuals']) # (B,NH,NS,8,3)
gt_mask = tf.tile(tf.expand_dims(hcls_onehot, 2), [1,1,NUM_SIZE_CLUSTER]) * \
tf.tile(tf.expand_dims(scls_onehot,1), [1,NUM_HEADING_BIN,1]) # (B,NH,NS)
corners_3d_pred = tf.reduce_sum( \
tf.to_float(tf.expand_dims(tf.expand_dims(gt_mask,-1),-1)) * corners_3d,
axis=[1,2]) # (B,8,3)
heading_bin_centers = tf.constant( \
np.arange(0,2*np.pi,2*np.pi/NUM_HEADING_BIN), dtype=tf.float32) # (NH,)
heading_label = tf.expand_dims(heading_residual_label,1) + \
tf.expand_dims(heading_bin_centers, 0) # (B,NH)
heading_label = tf.reduce_sum(tf.to_float(hcls_onehot) * heading_label, 1)
mean_sizes = tf.expand_dims( \
tf.constant(g_mean_size_arr, dtype=tf.float32), 0) # (1,NS,3)
size_label = mean_sizes + \
tf.expand_dims(size_residual_label, 1) # (1,NS,3) + (B,1,3) = (B,NS,3)
size_label = tf.reduce_sum( \
tf.expand_dims(tf.to_float(scls_onehot),-1)*size_label, axis=[1]) # (B,3)
corners_3d_gt = get_box3d_corners_helper( \
center_label, heading_label, size_label) # (B,8,3)
corners_3d_gt_flip = get_box3d_corners_helper( \
center_label, heading_label+np.pi, size_label) # (B,8,3)
corners_dist = tf.minimum(
tf.norm(corners_3d_pred - corners_3d_gt, axis=-1),
tf.norm(corners_3d_pred - corners_3d_gt_flip, axis=-1))
corners_loss = huber_loss(corners_dist, delta=1.0)
tf.summary.scalar('corners loss', corners_loss)
# Weighted sum of all losses
total_loss = mask_loss + box_loss_weight * (center_loss + \
heading_class_loss + size_class_loss + \
heading_residual_normalized_loss*20 + \
size_residual_normalized_loss*20 + \
stage1_center_loss + \
corner_loss_weight*corners_loss)
tf.add_to_collection('losses', total_loss)
return total_loss
def bicond_reader(placeholders, vocab_size, emb_dim, drop_keep_prob=1.0):
"""
Builds the tensorflow graph for a bidirectional LSTM conditional reader for question answering
:param placeholders: dict containing tensorflow placeholders
:param vocab_size: size of the vocab of the data to be used with this model
:param emb_dim: word embedding dimension
:param drop_keep_prob: keep probability for dropout
:return: score (unscaled logits), loss and prediction (normalised logits (softmax)) tensorflow ops
"""
# [batch_size, max_seq1_length]
question = placeholders['question']
# [batch_size, num_sup, max_seq2_length]
support = placeholders['support']
# [batch_size, candidate_size]
targets = tf.to_float(placeholders['targets'])
# [batch_size, max_num_cands]
candidates = placeholders['candidates']
with tf.variable_scope("embeddings"):
embeddings = tf.get_variable("word_embeddings", [vocab_size, emb_dim],
dtype=tf.float32)
with tf.variable_scope("embedders") as varscope:
question_embedded = tf.nn.embedding_lookup(embeddings, question)
varscope.reuse_variables()
support_embedded = tf.nn.embedding_lookup(embeddings, support)
varscope.reuse_variables()
candidates_embedded = tf.nn.embedding_lookup(embeddings, candidates)
dim1s, dim2s, dim3s, dim4s = tf.unstack(
tf.shape(support_embedded
)) # [batch_size, num_supports, max_seq2_length, emb_dim]
# iterate through all supports
num_steps = dim2s
initial_outputs = tf.TensorArray(size=num_steps, dtype='float32')
initial_i = tf.constant(0, dtype='int32')
# question_encoding = tf.reduce_sum(question_embedded, 1)
with tf.variable_scope("conditional_reader_seq1") as varscope1:
# seq1_states: (c_fw, h_fw), (c_bw, h_bw)
_, seq1_states = reader(question_embedded,
placeholders['question_lengths'],
emb_dim,
scope=varscope1,
drop_keep_prob=drop_keep_prob)
def should_continue(i, *args):
# execute the loop for all i supports
return i < num_steps
def iteration(i, outputs_):
# get all instances, take only i-th support, flatten so this becomes a 3-dim tensor
sup_batchi = tf.reshape(
tf.slice(support_embedded, [0, i, 0, 0], [dim1s, 1, dim3s, dim4s]),
[dim1s, dim3s, emb_dim
]) # [batch_size, num_supports, max_seq2_length, emb_dim]
sup_lens_batchi = tf.reshape(
tf.slice(placeholders['support_lengths'], [0, i], [dim1s, 1]),
[-1]) # [batch_size]
with tf.variable_scope("conditional_reader_seq2") as varscope2:
varscope1.reuse_variables()
# each [batch_size x max_seq_length x output_size]
outputs, states = reader(sup_batchi,
sup_lens_batchi,
emb_dim,
seq1_states,
scope=varscope2,
drop_keep_prob=drop_keep_prob)
output = tf.concat(axis=1,
values=[states[0][1],
states[1][1]]) # [batch_size, 2*emb_dim]
# squish back into emb_dim num dimensions
output = tf.contrib.layers.linear(output,
emb_dim) # [batch_size, emb_dim]
# batch matrix multiplication to get per-candidate scores
scores = tf.einsum(
'bid,bcd->bc', tf.expand_dims(output, 1), candidates_embedded
) # [batch_size, 1, emb_dim], [batch_size, max_num_cands, emb_dim] -> [batch_size, max_num_cands]
# append scores for the i-th support to previous supports so we can combine scores for all supports later
outputs_ = outputs_.write(i, scores)
return i + 1, outputs_
i, outputs = tf.while_loop(should_continue, iteration,
[initial_i, initial_outputs])
# packs along axis 0, there doesn't seem to be a way to change that (?)
outputs_logits = outputs.stack() # [num_support, batch_size, num_cands]
scores = tf.reduce_sum(outputs_logits, 0)
loss = tf.nn.softmax_cross_entropy_with_logits(logits=scores,
labels=targets)
predict = tf.nn.softmax(scores)
return scores, loss, predict
def _creat_model(self):
self.y_ = tf.one_hot(indices=self.y, depth=self.target_vocab_size)
with tf.variable_scope('generator'):
self.g = self.generator()
with tf.variable_scope('discriminator') as scope:
self.D_real = self.discriminator(self.y_)
scope.reuse_variables()
self.D_fake = self.discriminator(self.g)
self.G_params = tf.get_collection(tf.GraphKeys.TRAINABLE_VARIABLES,
scope='generator')
self.D_params = tf.get_collection(tf.GraphKeys.TRAINABLE_VARIABLES,
scope='discriminator')
self.preds = tf.to_int32(tf.arg_max(self.g, dimension=-1))
self.istarget = tf.to_float(tf.not_equal(self.y, 0))
self.acc = tf.reduce_sum(
tf.to_float(tf.equal(self.preds, self.y)) *
self.istarget) / (tf.reduce_sum(self.istarget))
tf.summary.scalar('acc', self.acc)
if self.is_training:
# Loss
self.y_smoothed = label_smoothing(
tf.one_hot(self.y, depth=self.target_vocab_size))
self.loss = tf.nn.softmax_cross_entropy_with_logits(
logits=self.g, labels=self.y_smoothed)
self.content_loss = tf.reduce_sum(
self.loss * self.istarget) / (tf.reduce_sum(self.istarget))
tf.summary.scalar('mean_loss', self.content_loss)
disc_loss = -tf.reduce_mean(self.D_real) + tf.reduce_mean(
self.D_fake)
gen_loss = -tf.reduce_mean(self.D_fake)
alpha = tf.random_uniform(shape=[hp.batch_size, 1, 1],
minval=0.,
maxval=1.)
differences = self.y_ - self.g
interpolates = self.y_ + alpha * differences
gradients = tf.gradients(self.discriminator(interpolates),
[interpolates])[0]
slopes = tf.sqrt(
tf.reduce_sum(tf.square(gradients), reduction_indices=[1]))
gradient_penalty = tf.reduce_mean((slopes - 1.)**2)
self.global_step = tf.Variable(0, name='global_step')
#====
# tf.assign(ref, value, validate_shape=None, use_locking=None, name=None)
#函数完成了将value赋值给ref的作用。其中：ref 必须是tf.Variable创建的tensor，如果ref=tf.constant()会报错！
#同时，shape（value）==shape（ref）
#=====
self.gs_op = tf.assign(self.global_step,
tf.add(self.global_step, 1))
self.D_loss = self.SIGMA * (disc_loss +
self.LAMBDA * gradient_penalty)
self.G_loss = self.content_loss + self.SIGMA * gen_loss
self.D_opt = tf.train.AdamOptimizer(
learning_rate=hp.D_learning_rate, beta1=0.5,
beta2=0.9).minimize(self.D_loss, var_list=self.D_params)
self.G_opt = tf.train.AdamOptimizer(
learning_rate=hp.G_learning_rate,
beta1=0.8,
beta2=0.98,
epsilon=1e-8).minimize(self.G_loss, var_list=self.G_params)
self.merged = tf.summary.merge_all()
def adam_train(x_train, y_train, x_valid, y_valid, x_test):
# TODO: Make sure you set all the random seed properly at the beginning
# of this function so your code won't
# have different output every time you run
x_train = x_train.reshape((len(x_train), -1))
x_valid = x_valid.reshape((len(x_valid), -1))
x_test = x_test.reshape((len(x_test), -1))
y_train = one_hot(y_train, 10)
y_valid = one_hot(y_valid, 10)
n_inputs = 32 * 32 * 3
n_hidden1 = 200
n_hidden2 = 100
n_outputs = 10
X = tf.placeholder(tf.float32, shape=(None, n_inputs), name="X")
y = tf.placeholder(tf.float32, shape=(None, n_outputs), name="y")
def neuron_layer(X, n_neurons, name, activation=None):
with tf.name_scope(name):
n_inputs = int(X.get_shape()[1])
stddev = 2 / np.sqrt(n_inputs)
init = tf.truncated_normal((n_inputs, n_neurons), stddev=stddev)
W = tf.Variable(init, name="kernel")
b = tf.Variable(tf.zeros([1, n_neurons]), name="bias")
Z = tf.matmul(X, W) + b
if activation is not None:
return activation(Z), W, b
else:
return Z, W, b
with tf.name_scope("dnn"):
hidden1, W1, b1 = neuron_layer(X,
n_hidden1,
name="hidden1",
activation=tf.nn.relu)
hidden2, W2, b2 = neuron_layer(hidden1,
n_hidden2,
name="hidden2",
activation=tf.nn.relu)
logits, W3, b3 = neuron_layer(hidden2, n_outputs, name="outputs")
with tf.name_scope("loss"):
yp = tf.nn.softmax(logits)
loss = tf.reduce_mean(
tf.nn.softmax_cross_entropy_with_logits(labels=y, logits=logits))
with tf.name_scope("backprop"):
d_logits = yp - y
d_hidden2 = tf.matmul(d_logits, tf.transpose(W3))
d_W3 = tf.matmul(tf.transpose(hidden2), d_logits)
d_b3 = tf.reduce_sum(d_logits, axis=0, keep_dims=True)
d_2 = tf.to_float(tf.greater(tf.matmul(hidden1, W2) + b2,
0)) * d_hidden2
d_hidden1 = tf.matmul(d_2, tf.transpose(W2))
d_W2 = tf.matmul(tf.transpose(hidden1), d_2)
d_b2 = tf.reduce_sum(d_2, axis=0, keep_dims=True)
d_1 = tf.to_float(tf.greater(tf.matmul(X, W1) + b1, 0)) * d_hidden1
d_W1 = tf.matmul(tf.transpose(X), d_1)
d_b1 = tf.reduce_sum(d_1, axis=0, keep_dims=True)
learning_rate = 0.0001 # this is a good learning rate. you can change
update_ops = [] # contains the ops to update auxilary variables like
# beta_power, m and v
training_ops = [] # contains the ops to update variables
eps = 1e-8
# list of params and gradient
Vs = [W1, b1, W2, b2, W3, b3]
dVs = [d_W1, d_b1, d_W2, d_b2, d_W3, d_b3]
# set betas
beta1 = 0.9
beta2 = 0.999
# TODO: write all the code to update betas, m, v, compute m_hat, v_hat
# and update all the variables here.
# Add all tensorflow ops to update betas, m,v to updates_ops
# Add all ops to update V to training_ops
#minimize loss function
# t = tf.Variable(0.)
#
# with tf.name_scope("adam"):
#
# m_array = [0] * len(Vs)
# v_array = [0] * len(dVs)
# training_ops = [None] * len(Vs)
# for i in range(len(Vs)):
# m_array[i] = beta1 * m_array[i] + ((1-beta1) * dVs[i])
# v_array[i] = beta2 * v_array[i] + ((1-beta2) * tf.square(dVs[i]))
#
# mt_hat = m_array[i]/(1 - beta1**t)
# vt_hat = v_array[i]/(1 - beta2**t)
#
# params = tf.assign(Vs[i], Vs[i] - learning_rate * (mt_hat/(tf.sqrt(vt_hat) + eps )))
# training_ops.append(params)
# #a = learning_rate * (mt_hat_w/(tf.sqrt(vt_hat_w + eps)))
#
# update_ops.append(m_array)
# update_ops.append(v_array)
t = tf.Variable(0.)
with tf.name_scope("adam"):
m_array = []
v_array = []
for i in range(len(Vs)):
m_array.append(tf.Variable(tf.zeros(Vs[i].shape)))
v_array.append(tf.Variable(tf.zeros(Vs[i].shape)))
for i in range(len(Vs)):
m = tf.assign(m_array[i],
beta1 * m_array[i] + ((1 - beta1) * dVs[i]))
v = tf.assign(
v_array[i],
beta2 * v_array[i] + ((1 - beta2) * tf.square(dVs[i])))
update_ops.append((m, v))
learning_rate *= tf.sqrt(1 - (beta2**t)) / (1 - (beta1**t))
params = tf.assign(
Vs[i], Vs[i] - learning_rate * (m / (tf.sqrt(v) + eps)))
training_ops.append(params)
with tf.name_scope("eval"):
accuracy = 100.0 * tf.reduce_mean(
tf.cast(tf.equal(tf.argmax(logits, axis=1), tf.argmax(y, axis=1)),
dtype=tf.float32))
init = tf.global_variables_initializer()
n_epochs = 100
batch_size = 200
n_batches = len(x_train) * 3 // batch_size
dataset_iterator = DatasetIterator(x_train, y_train, batch_size)
with tf.Session() as sess:
sess.run(init)
for epoch in range(n_epochs):
# compute model
sess.run(tf.assign(t, t + 1))
for iteration in range(n_batches):
x_batch, y_batch = dataset_iterator.next_batch()
sess.run(update_ops, feed_dict={X: x_batch, y: y_batch})
sess.run(training_ops, feed_dict={X: x_batch, y: y_batch})
acc_train = accuracy.eval(feed_dict={X: x_batch, y: y_batch})
acc_validation = accuracy.eval(feed_dict={X: x_valid, y: y_valid})
print(epoch, "Training batch accuracy:", acc_train,
"Validation set accuracy:", acc_validation)
# Now that the model is trained, it is the test time!
yp_test = sess.run(tf.argmax(logits, axis=1), feed_dict={X: x_test})
return yp_test
def reinforce_episodic_gradients(logits, sampled_outputs, rewards, lengths=None,
params=None):
"""
Calculate REINFORCE gradients given a batch of single episodic rewards.
Args:
logits: list of `num_timesteps` batches, each of size
`batch_size * num_classes`: logits for distribution over actions
at each timestep
sampled_outputs: list of `num_timesteps` batches, each of size
`batch_size`: ints describing sampled action at each timestep
for each example
rewards: float batch `batch_size` describing episodic reward per
example
lengths: `None` or a `batch_size` int batch describing length of each
sequence. If `None`, then all sequences are assumed to have the
same length `num_timesteps`
baseline_fn:
params:
Return:
updates: list of (gradient, param) update tuples
"""
if params is None:
params = tf.trainable_variables()
batch_size = tf.shape(logits[0])[0]
num_classes = tf.shape(logits[0])[1]
num_timesteps = len(logits)
# Feed logits through log softmax.
log_softmaxes = [tf.nn.log_softmax(logits_t) for logits_t in logits]
# Fetch p(sampled_output) for each timestep.
# This is a bit awkward -- need to pick a single element out of each
# example softmax vector.
# Output is (batch_size, 1) per timestep
flat_softmaxes = [tf.reshape(log_softmax_t, (-1,))
for log_softmax_t in log_softmaxes]
lookup_offset = tf.range(batch_size) * num_classes
log_p_sampled = [tf.gather(log_softmax_t, tf.to_int32(sampled_outputs_t) + lookup_offset)
for log_softmax_t, sampled_outputs_t
in zip(flat_softmaxes, sampled_outputs)]
# Merge into single (batch_size, num_timesteps) batch
log_p_sampled = [tf.expand_dims(log_p_sampled_t, 1)
for log_p_sampled_t in log_p_sampled]
log_p_sampled = tf.concat(1, log_p_sampled)
if lengths is not None:
# For each example, zero out probabilities after i > example_length
mask = tf.tile(tf.expand_dims(tf.range(num_timesteps), 0), (batch_size, 1))
mask = tf.to_float(tf.greater(tf.expand_dims(lengths, 1), mask))
log_p_sampled *= mask
# Calculate p(sampled_output) by chain rule. We can merge these ahead of
# time, since we only have a single episode-level reward.
# (batch_size,) batch
log_p_sampled = tf.reduce_sum(log_p_sampled, 1)
# Main REINFORCE gradient equation.
# Apply rewards on batch + mean beforehand for efficiency.
log_p_sampled *= -1 * rewards
log_p_sampled = tf.reduce_mean(log_p_sampled)
gradients = tf.gradients(log_p_sampled, params)
return zip(gradients, params)
def frame_loss(Y, batch_size):
frame_loss = 0
b,h,w,d = tf.unstack(tf.shape(Y))
for i in xrange(batch_size - 1):
frame_loss += tf.nn.l2_loss(Y[i+1,:,:,:] - Y[i,:,:,:]) * 2 / tf.to_float(h*w*d)
return frame_loss / (batch_size-1)
def L2_loss(x,y):
size = tf.size(x)
return tf.nn.l2_loss(x-y)* 2 / tf.to_float(size)
def build_model_graph(features, labels, is_training, params):
"""Builds the forward model graph."""
use_batched_nms = (not params['use_tpu'] and params['use_batched_nms'])
is_gpu_inference = (not is_training and use_batched_nms)
model_outputs = {}
if is_training and params['transpose_input']:
if (params['backbone'].startswith('resnet')
and params['conv0_space_to_depth_block_size'] > 0):
features['images'] = tf.transpose(features['images'], [2, 0, 1, 3])
else:
features['images'] = tf.transpose(features['images'], [3, 0, 1, 2])
batch_size, image_height, image_width, _ = (
features['images'].get_shape().as_list())
conv0_space_to_depth_block_size = 0
if (is_training and (params['backbone'].startswith('resnet')
and params['conv0_space_to_depth_block_size'] > 0)):
conv0_space_to_depth_block_size = params[
'conv0_space_to_depth_block_size']
image_height *= conv0_space_to_depth_block_size
image_width *= conv0_space_to_depth_block_size
if 'source_ids' not in features:
features['source_ids'] = -1 * tf.ones([batch_size], dtype=tf.float32)
all_anchors = anchors.Anchors(params['min_level'], params['max_level'],
params['num_scales'],
params['aspect_ratios'],
params['anchor_scale'],
(image_height, image_width))
if 'resnet' in params['backbone']:
with tf.variable_scope(params['backbone']):
resnet_fn = resnet.resnet_v1(
params['backbone'],
conv0_kernel_size=params['conv0_kernel_size'],
conv0_space_to_depth_block_size=conv0_space_to_depth_block_size,
num_batch_norm_group=params['num_batch_norm_group'])
backbone_feats = resnet_fn(
features['images'], (params['is_training_bn'] and is_training))
elif 'mnasnet' in params['backbone']:
with tf.variable_scope(params['backbone']):
_, endpoints = mnasnet_models.build_mnasnet_base(
features['images'],
params['backbone'],
training=(params['is_training_bn'] and is_training),
override_params={'use_keras': False})
backbone_feats = {
2: endpoints['reduction_2'],
3: endpoints['reduction_3'],
4: endpoints['reduction_4'],
5: endpoints['reduction_5'],
}
else:
raise ValueError('Not a valid backbone option: %s' %
params['backbone'])
fpn_feats = fpn.fpn(backbone_feats, params['min_level'],
params['max_level'])
model_outputs.update({
'fpn_features': fpn_feats,
})
rpn_score_outputs, rpn_box_outputs = heads.rpn_head(
fpn_feats, params['min_level'], params['max_level'],
len(params['aspect_ratios'] * params['num_scales']))
if is_training:
rpn_pre_nms_topn = params['rpn_pre_nms_topn']
rpn_post_nms_topn = params['rpn_post_nms_topn']
else:
rpn_pre_nms_topn = params['test_rpn_pre_nms_topn']
rpn_post_nms_topn = params['test_rpn_post_nms_topn']
rpn_box_scores, rpn_box_rois = roi_ops.multilevel_propose_rois(
rpn_score_outputs,
rpn_box_outputs,
all_anchors,
features['image_info'],
rpn_pre_nms_topn,
rpn_post_nms_topn,
params['rpn_nms_threshold'],
params['rpn_min_size'],
bbox_reg_weights=None,
use_batched_nms=use_batched_nms)
rpn_box_rois = tf.to_float(rpn_box_rois)
if is_training:
rpn_box_rois = tf.stop_gradient(rpn_box_rois)
rpn_box_scores = tf.stop_gradient(rpn_box_scores)
if is_training:
# Sampling
box_targets, class_targets, rpn_box_rois, proposal_to_label_map = (
training_ops.proposal_label_op(
rpn_box_rois,
labels['gt_boxes'],
labels['gt_classes'],
features['image_info'],
batch_size_per_im=params['batch_size_per_im'],
fg_fraction=params['fg_fraction'],
fg_thresh=params['fg_thresh'],
bg_thresh_hi=params['bg_thresh_hi'],
bg_thresh_lo=params['bg_thresh_lo']))
# Performs multi-level RoIAlign.
box_roi_features = spatial_transform_ops.multilevel_crop_and_resize(
fpn_feats,
rpn_box_rois,
output_size=7,
is_gpu_inference=is_gpu_inference)
class_outputs, box_outputs, _ = heads.box_head(
box_roi_features,
num_classes=params['num_classes'],
mlp_head_dim=params['fast_rcnn_mlp_head_dim'])
if not is_training:
if is_gpu_inference:
generate_detections_fn = postprocess_ops.generate_detections_gpu
else:
generate_detections_fn = postprocess_ops.generate_detections_tpu
detections = generate_detections_fn(
class_outputs, box_outputs, rpn_box_rois, features['image_info'],
params['test_rpn_post_nms_topn'],
params['test_detections_per_image'], params['test_nms'],
params['bbox_reg_weights'])
model_outputs.update({
'num_detections': detections[0],
'detection_boxes': detections[1],
'detection_classes': detections[2],
'detection_scores': detections[3],
})
else:
encoded_box_targets = training_ops.encode_box_targets(
rpn_box_rois, box_targets, class_targets,
params['bbox_reg_weights'])
model_outputs.update({
'rpn_score_outputs': rpn_score_outputs,
'rpn_box_outputs': rpn_box_outputs,
'class_outputs': class_outputs,
'box_outputs': box_outputs,
'class_targets': class_targets,
'box_targets': encoded_box_targets,
'box_rois': rpn_box_rois,
})
# Faster-RCNN mode.
if not params['include_mask']:
return model_outputs
# Mask sampling
if not is_training:
selected_box_rois = model_outputs['detection_boxes']
class_indices = model_outputs['detection_classes']
# If using GPU for inference, delay the cast until when Gather ops show up
# since GPU inference supports float point better.
# TODO(laigd): revisit this when newer versions of GPU libraries is
# released.
if not is_gpu_inference:
class_indices = tf.to_int32(class_indices)
else:
(selected_class_targets, selected_box_targets, selected_box_rois,
proposal_to_label_map) = (training_ops.select_fg_for_masks(
class_targets,
box_targets,
rpn_box_rois,
proposal_to_label_map,
max_num_fg=int(params['batch_size_per_im'] *
params['fg_fraction'])))
class_indices = tf.to_int32(selected_class_targets)
mask_roi_features = spatial_transform_ops.multilevel_crop_and_resize(
fpn_feats,
selected_box_rois,
output_size=14,
is_gpu_inference=is_gpu_inference)
mask_outputs = heads.mask_head(mask_roi_features,
class_indices,
num_classes=params['num_classes'],
mrcnn_resolution=params['mrcnn_resolution'],
is_gpu_inference=is_gpu_inference)
if is_training:
mask_targets = training_ops.get_mask_targets(
selected_box_rois, proposal_to_label_map, selected_box_targets,
labels['cropped_gt_masks'], params['mrcnn_resolution'])
model_outputs.update({
'mask_outputs': mask_outputs,
'mask_targets': mask_targets,
'selected_class_targets': selected_class_targets,
})
else:
model_outputs.update({
'detection_masks': tf.nn.sigmoid(mask_outputs),
})
return model_outputs
def build_lstm_graph(self):
config = self.config
vocab_size = self.vocab.vocab_size
self.global_step = tf.get_variable("global_step", [],
tf.int32,
initializer=tf.zeros_initializer,
trainable=False)
with tf.name_scope('input'):
self.x, self.y, self.w = self.iterator.get_next()
# self.x = tf.placeholder(tf.int32, [config.batch_size, config.num_steps])
# self.y = tf.placeholder(tf.int32, [config.batch_size, config.num_steps])
# self.w = tf.placeholder(tf.int32, [config.batch_size, config.num_steps])
self.keep_prob = tf.get_variable('keep_prob', [],
dtype=tf.float32,
trainable=False)
self.new_keep_prob = tf.placeholder(tf.float32,
shape=[],
name="new_keep_prob")
self.keep_prob_update = tf.assign(self.keep_prob,
self.new_keep_prob)
self.lr = tf.get_variable('lr', [],
dtype=tf.float32,
trainable=False)
self.new_lr = tf.placeholder(tf.float32, shape=[], name="new_lr")
self.lr_update = tf.assign(self.lr, self.new_lr)
with tf.name_scope('embedding'):
self.embed = tf.get_variable('embedding',
shape=[vocab_size, config.embed_size],
dtype=tf.float32)
self.embed_x = tf.nn.embedding_lookup(self.embed, self.x)
if config.keep_prob < 1.0:
self.embed_x = tf.nn.dropout(self.embed_x, config.keep_prob)
with tf.name_scope('lstm'):
cells = []
for _ in range(config.num_layers):
cell = tf.contrib.rnn.LSTMBlockCell(config.hidden_size,
forget_bias=0.0)
if config.keep_prob < 1.0:
cell = tf.contrib.rnn.DropoutWrapper(
cell, output_keep_prob=config.keep_prob)
cells.append(cell)
cell = tf.contrib.rnn.MultiRNNCell(cells)
self.outputs, _ = tf.nn.dynamic_rnn(cell,
self.embed_x,
dtype=tf.float32)
self.outputs = tf.reshape(
self.outputs,
[config.batch_size * config.num_steps, config.hidden_size])
with tf.name_scope('softmax'):
self.softmax_w = tf.get_variable('softmax_w',
[vocab_size, config.hidden_size],
dtype=tf.float32)
self.softmax_b = tf.get_variable('softmax_b', [vocab_size],
dtype=tf.float32)
with tf.name_scope('loss'):
if config.num_sampled > 0:
labels = tf.reshape(self.y,
[config.batch_size * config.num_steps, 1])
self.loss = tf.nn.sampled_softmax_loss(
weights=self.softmax_w,
biases=self.softmax_b,
labels=labels,
inputs=self.outputs,
num_sampled=config.num_sampled,
num_classes=vocab_size,
partition_strategy="div")
else:
labels = tf.reshape(self.y,
[config.batch_size * config.num_steps])
logits = tf.matmul(self.outputs, tf.transpose(self.softmax_w))
logits = tf.nn.bias_add(logits, self.softmax_b)
self.loss = tf.nn.sparse_softmax_cross_entropy_with_logits(
labels=labels, logits=logits)
self.loss = tf.reduce_mean(
tf.reshape(self.loss, [config.num_steps, config.batch_size]) *
tf.reshape(tf.to_float(self.w),
[config.num_steps, config.batch_size]),
axis=1)
self.loss = tf.reshape(self.loss, [config.num_steps])
self.loss = tf.reduce_sum(self.loss)
with tf.name_scope('optimize'):
tvars = tf.trainable_variables()
grads, _ = tf.clip_by_global_norm(tf.gradients(self.loss, tvars),
config.max_grad_norm)
optimizer = tf.train.GradientDescentOptimizer(self.lr)
self.train_op = optimizer.apply_gradients(
zip(grads, tvars), global_step=self.global_step)
with tf.name_scope('ema'):
lstm_vars = tf.get_collection(tf.GraphKeys.TRAINABLE_VARIABLES,
".*lstm.*")
ema = tf.train.ExponentialMovingAverage(decay=0.999)
self.train_op = tf.group(*[self.train_op, ema.apply(lstm_vars)])
def loss_1st(y_true, y_pred):
L = y_true
Y = y_pred
batch_size = tf.to_float(K.shape(L)[0])
return alpha * 2 * tf.linalg.trace(tf.matmul(tf.matmul(Y, L, transpose_a=True), Y)) / batch_size
def __init__(self, dataset_type, input_dimensions, regularizer, number_mini_batches, number_output_units, activation_unit, learning_rate,
hidden_units, number_samples_variance_reduction, precision_alpha, weights_prior_mean_1, weights_prior_mean_2,
weights_prior_deviation_1, weights_prior_deviation_2, mixture_pie, rho_mean, extra_likelihood_emphasis, delta=0.1,
num_classes=1, num_dimensions=1, ss=0):
number_output_units = num_classes * num_dimensions
self.dataset_type = dataset_type
self.num_classes = num_classes
self.regularizer = regularizer
self.number_mini_batches = tf.constant(number_mini_batches, dtype=tf.int64)
self.activation_unit = activation_unit
self.learning_rate = learning_rate
self.hidden_units = hidden_units
self.number_samples_variance_reduction = number_samples_variance_reduction
self.precision_alpha = precision_alpha
self.weights_prior_mean_1 = weights_prior_mean_1
self.weights_prior_mean_2 = weights_prior_mean_2
self.weights_prior_deviation_1 = weights_prior_deviation_1
self.weights_prior_deviation_2 = weights_prior_deviation_2
self.mixture_pie = mixture_pie
self.rho_mean = rho_mean
self.extra_likelihood_emphasis = extra_likelihood_emphasis
self.global_step = tf.Variable(0, dtype=tf.int64, trainable=False, name='global_step')
self.mini_batch_index = tf.Variable(1, dtype=tf.int64, trainable=False, name='mini_batch_index')
#self.all_prior_cost = 0
#self.all_variational_MAP_cost = 0
self.all_likelihood_cost = 0
output_forward_pass_1 = None
output_forward_pass_2 = None
output_forward_pass_3 = None
output_forward_pass_4 = None
output_forward_pass_5 = None
output_forward_pass = None
# Mixture Prior
#ds = tf.contrib.distributions
#self.WEIGHTS_PRIOR = ds.Mixture(cat=ds.Categorical(probs=[self.mixture_pie, 1.- self.mixture_pie]),
# components=[ds.Normal(loc=self.weights_prior_mean_1, scale=self.weights_prior_deviation_1), ds.Normal(loc=self.weights_prior_mean_2, scale=self.weights_prior_deviation_2)],
# name='WEIGHTS_MIXTURE_PRIOR')
self.WEIGHTS_PRIOR = tf.distributions.Normal(loc=0., scale=1., name='WEIGHTS_PRIOR')
with tf.name_scope('inputs'):
self.input_x = tf.placeholder(tf.float32, shape=(None, input_dimensions), name='input_x')
self.input_y = tf.placeholder(tf.float32, shape=(None, number_output_units), name='input_y')
self.N_BOUND = tf.placeholder(tf.float32, shape=(), name='N_BOUND')
with tf.name_scope('input_output_forward_pass_mapping'):
with tf.name_scope('between_input_and_first_hidden_layer'):
self.sampled_weights_1, self.sampled_biases_1, self.mu_weights_1, self.rho_weights_1, self.mu_biases_1, self.rho_biases_1 = self.get_weights_and_phi(shape=(input_dimensions, self.hidden_units[0]))
#self.all_variational_MAP_cost = self.all_variational_MAP_cost + variational_MAP_cost
#self.all_prior_cost = self.all_prior_cost + prior_cost
for variance_reductor_iterator in range(self.number_samples_variance_reduction):
if output_forward_pass_1 == None:
output_forward_pass_1 = self.fetch_ACTIVATION_UNIT(tf.matmul(self.input_x, self.sampled_weights_1[variance_reductor_iterator]) + self.sampled_biases_1[variance_reductor_iterator])[None]
else:
output_forward_pass_1 = tf.concat([output_forward_pass_1, self.fetch_ACTIVATION_UNIT(tf.matmul(self.input_x, self.sampled_weights_1[variance_reductor_iterator]) + self.sampled_biases_1[variance_reductor_iterator])[None]], 0)
with tf.name_scope('between_hidden_layers'):
self.sampled_weights_2, self.sampled_biases_2, self.mu_weights_2, self.rho_weights_2, self.mu_biases_2, self.rho_biases_2 = self.get_weights_and_phi(shape=(self.hidden_units[0], self.hidden_units[1]))
#self.all_variational_MAP_cost = self.all_variational_MAP_cost + variational_MAP_cost
#self.all_prior_cost = self.all_prior_cost + prior_cost
for variance_reductor_iterator in range(self.number_samples_variance_reduction):
if output_forward_pass_2 == None:
output_forward_pass_2 = self.fetch_ACTIVATION_UNIT(tf.matmul(output_forward_pass_1[variance_reductor_iterator], self.sampled_weights_2[variance_reductor_iterator]) + self.sampled_biases_2[variance_reductor_iterator])[None]
else:
output_forward_pass_2 = tf.concat([output_forward_pass_2, self.fetch_ACTIVATION_UNIT(tf.matmul(output_forward_pass_1[variance_reductor_iterator], self.sampled_weights_2[variance_reductor_iterator]) + self.sampled_biases_2[variance_reductor_iterator])[None]], 0)
self.sampled_weights_3, self.sampled_biases_3, self.mu_weights_3, self.rho_weights_3, self.mu_biases_3, self.rho_biases_3 = self.get_weights_and_phi(shape=(self.hidden_units[1], self.hidden_units[2]))
#self.all_variational_MAP_cost = self.all_variational_MAP_cost + variational_MAP_cost
#self.all_prior_cost = self.all_prior_cost + prior_cost
for variance_reductor_iterator in range(self.number_samples_variance_reduction):
if output_forward_pass_3 == None:
output_forward_pass_3 = self.fetch_ACTIVATION_UNIT(tf.matmul(output_forward_pass_2[variance_reductor_iterator], self.sampled_weights_3[variance_reductor_iterator]) + self.sampled_biases_3[variance_reductor_iterator])[None]
else:
output_forward_pass_3 = tf.concat([output_forward_pass_3, self.fetch_ACTIVATION_UNIT(tf.matmul(output_forward_pass_2[variance_reductor_iterator], self.sampled_weights_3[variance_reductor_iterator]) + self.sampled_biases_3[variance_reductor_iterator])[None]], 0)
with tf.name_scope('between_last_hidden_and_output_layer'):
self.sampled_weights_4, self.sampled_biases_4, self.mu_weights_4, self.rho_weights_4, self.mu_biases_4, self.rho_biases_4 = self.get_weights_and_phi(shape=(self.hidden_units[-1], number_output_units))
#self.all_variational_MAP_cost = self.all_variational_MAP_cost + variational_MAP_cost
#self.all_prior_cost = self.all_prior_cost + prior_cost
for variance_reductor_iterator in range(self.number_samples_variance_reduction):
if dataset_type == 'categorical':
if output_forward_pass == None:
output_forward_pass = tf.nn.softmax(tf.matmul(output_forward_pass_3[variance_reductor_iterator], self.sampled_weights_4[variance_reductor_iterator]) + self.sampled_biases_4[variance_reductor_iterator])[None]
else:
output_forward_pass = tf.concat([output_forward_pass, (tf.matmul(output_forward_pass_3[variance_reductor_iterator], self.sampled_weights_4[variance_reductor_iterator]) + self.sampled_biases_4[variance_reductor_iterator])[None]], 0)
model_distribution = tf.distributions.Categorical(probs=output_forward_pass)
self.all_likelihood_cost = self.all_likelihood_cost + tf.reduce_sum(model_distribution.log_prob(self.input_y))
elif dataset_type == 'continuous':
if output_forward_pass == None:
output_forward_pass = (tf.matmul(output_forward_pass_3[variance_reductor_iterator], self.sampled_weights_4[variance_reductor_iterator]) + self.sampled_biases_4[variance_reductor_iterator])[None]
else:
output_forward_pass = tf.concat([output_forward_pass, (tf.matmul(output_forward_pass_3[variance_reductor_iterator], self.sampled_weights_4[variance_reductor_iterator]) + self.sampled_biases_4[variance_reductor_iterator])[None]], 0)
model_distribution = tf.distributions.Normal(loc=output_forward_pass[variance_reductor_iterator], scale=(1.0/tf.sqrt(self.precision_alpha)))
self.all_likelihood_cost = self.all_likelihood_cost + tf.reduce_sum(model_distribution.log_prob(self.input_y))
with tf.name_scope('final_outputs'):
if dataset_type == 'categorical':
'''
predicted_classes = tf.argmax(output_forward_pass, axis=1)
self.mean_of_output_forward_pass = tf.reduce_max(tf.bincount())
self.deviation_of_output_forward_pass =
self.maximum_of_output_forward_pass = tf.reduce_max(predicted_classes, axis=0, name='prediction_maximum')
self.minimum_of_output_forward_pass = tf.reduce_min(predicted_classes, axis=0, name='prediction_minimum')
'''
pass
## This is to be fixed ##
elif dataset_type == 'continuous':
mean_of_output_forward_pass_temporary, variance_of_output_forward_pass = tf.nn.moments(output_forward_pass, 0, name='pred_mean_n_var')
self.mean_of_output_forward_pass = tf.identity(mean_of_output_forward_pass_temporary, name='pred_mean')
self.deviation_of_output_forward_pass = tf.sqrt(variance_of_output_forward_pass, name='pred_sigma')
self.maximum_of_output_forward_pass = tf.reduce_max(output_forward_pass, axis=0, name='pred_max')
self.minimum_of_output_forward_pass = tf.reduce_min(output_forward_pass, axis=0, name='pred_min')
with tf.name_scope('cost'):
self.intercost_minibatch_weight_pie = (tf.pow(2., tf.to_float(self.number_mini_batches - self.mini_batch_index)))/(tf.pow(2., tf.to_float(self.number_mini_batches)) - 1)
#self.complexity_cost = self.all_variational_MAP_cost - self.all_prior_cost
#self.var_MAP_cost = tf.identity(self.all_variational_MAP_cost, name='var_MAP_cost')
#self.pr_cost = tf.identity(self.all_prior_cost, name='prior_cost')
#self.ll_cost = tf.multiply(self.extra_likelihood_emphasis, self.all_likelihood_cost, name='likelihood_cost')
self.all_likelihood_cost = tf.divide(self.all_likelihood_cost, tf.cast(self.number_samples_variance_reduction, tf.float32), name='likelihood_cost')
self.all_prior_cost = tf.divide(tf.reduce_sum(self.WEIGHTS_PRIOR.log_prob(self.sampled_weights_1)) + tf.reduce_sum(self.WEIGHTS_PRIOR.log_prob(self.sampled_biases_1)) + tf.reduce_sum(self.WEIGHTS_PRIOR.log_prob(self.sampled_weights_2)) + tf.reduce_sum(self.WEIGHTS_PRIOR.log_prob(self.sampled_biases_2)) + tf.reduce_sum(self.WEIGHTS_PRIOR.log_prob(self.sampled_weights_3)) + tf.reduce_sum(self.WEIGHTS_PRIOR.log_prob(self.sampled_biases_3)) + tf.reduce_sum(self.WEIGHTS_PRIOR.log_prob(self.sampled_weights_4)) + tf.reduce_sum(self.WEIGHTS_PRIOR.log_prob(self.sampled_biases_4)), tf.cast(self.number_samples_variance_reduction, tf.float32))
self.weight_vector = tf.concat([tf.reshape(self.sampled_weights_1, [-1]), tf.reshape(self.sampled_biases_1, [-1]), tf.reshape(self.sampled_weights_2, [-1]), tf.reshape(self.sampled_biases_2, [-1]), tf.reshape(self.sampled_weights_3, [-1]), tf.reshape(self.sampled_biases_3, [-1]), tf.reshape(self.sampled_weights_4, [-1]), tf.reshape(self.sampled_biases_4, [-1])], axis=0)
self.mu_vector = tf.concat([tf.reshape(self.mu_weights_1, [-1]), tf.reshape(self.mu_biases_1, [-1]), tf.reshape(self.mu_weights_2, [-1]), tf.reshape(self.mu_biases_2, [-1]), tf.reshape(self.mu_weights_3, [-1]), tf.reshape(self.mu_biases_3, [-1]), tf.reshape(self.mu_weights_4, [-1]), tf.reshape(self.mu_biases_4, [-1])], axis=0)
self.rho_vector = tf.concat([tf.reshape(self.rho_weights_1, [-1]), tf.reshape(self.rho_biases_1, [-1]), tf.reshape(self.rho_weights_2, [-1]), tf.reshape(self.rho_biases_2, [-1]), tf.reshape(self.rho_weights_3, [-1]), tf.reshape(self.rho_biases_3, [-1]), tf.reshape(self.rho_weights_4, [-1]), tf.reshape(self.rho_biases_4, [-1])], axis=0)
self.variational_distribution = tf.distributions.Normal(loc=self.mu_vector, scale=tf.log(1 + tf.exp(self.rho_vector)))
self.all_variational_MAP_cost = tf.divide(tf.reduce_sum(self.variational_distribution.log_prob(self.weight_vector)), tf.cast(self.number_samples_variance_reduction, tf.float32))
self.ELBO = tf.subtract((self.intercost_minibatch_weight_pie * (self.all_variational_MAP_cost - self.all_prior_cost)), (self.extra_likelihood_emphasis * self.all_likelihood_cost), name='ELBO')
if self.regularizer == 'PAC_Bayes':
if ss == 0:
s_square = self.extra_likelihood_emphasis
elif ss == 1:
s_square = (1/self.precision_alpha)
elif ss == 2:
s_square = (self.extra_likelihood_emphasis/self.precision_alpha)
else:
s_square = (1/self.precision_alpha) + self.extra_likelihood_emphasis
self.pac_bayes_bound = tf.subtract((((self.all_variational_MAP_cost - self.all_prior_cost + tf.log(1/delta))/self.N_BOUND) + (s_square/2)), ((self.extra_likelihood_emphasis * self.all_likelihood_cost)/self.N_BOUND), name='pac_bayes_bound')
#self.pac_bayes_bound = tf.add((-self.extra_likelihood_emphasis * self.all_likelihood_cost), tf.add(((tf.reduce_sum(tf.distributions.kl_divergence(self.variational_distribution, self.WEIGHTS_PRIOR)) + tf.log(1/delta))/N_BOUND), ((self.extra_likelihood_emphasis*self.precision_alpha)/2)), name='pac_bayes_bound')
self.cost = tf.identity(self.ELBO, name='cost')
else:
self.pac_bayes_bound = tf.constant(0., name='pac_bayes_bound')
self.cost = tf.multiply(-self.extra_likelihood_emphasis, self.all_likelihood_cost, name='cost')
with tf.name_scope('error'):
if dataset_type == 'continuous':
self.pred_err = tf.reduce_mean(tf.squared_difference(self.mean_of_output_forward_pass, self.input_y), name='pred_err')
elif dataset_type == 'categorical':
pass
##################################
##################################
##################################
### Need to finish this up later ####
#self.pred_train_err = tf.equal(tf.argmax())
#self.pred_val_err =
with tf.name_scope('optimization'):
optimizer = tf.train.AdamOptimizer(self.learning_rate, name='adam_optimizer')
self.training = optimizer.minimize(self.cost, global_step=self.global_step, name='training')
with tf.name_scope('summaries'):
#tf.summary.scalar(name='pred_err_log', tensor=self.pred_err)
#tf.summary.scalar(name='deviation_of_output_forward_pass_log', tensor=tf.reduce_mean(self.deviation_of_output_forward_pass))
#tf.summary.scalar(name='prior_cost_log', tensor=self.all_prior_cost)
#tf.summary.scalar(name='variational_MAP_cost_log', tensor=self.all_variational_MAP_cost)
#tf.summary.scalar(name='likelihood_cost_log', tensor=self.all_likelihood_cost)
#tf.summary.scalar(name='complexity_cost_log', tensor=self.complexity_cost)
tf.summary.scalar(name='cost_log', tensor=self.cost)
self.summary_op = tf.summary.merge_all()
with tf.name_scope('mini_batch_index_update'):
self.mini_batch_index_update = tf.assign(ref=self.mini_batch_index, value=((self.mini_batch_index % self.number_mini_batches) + 1), name='mini_batch_index_update')
def safe_div(numerator, denominator):
"""Safe division, return 0 if denominator is 0"""
numerator, denominator = tf.to_float(numerator), tf.to_float(denominator)
zeros = tf.zeros_like(numerator, dtype=numerator.dtype)
denominator_is_zero = tf.equal(denominator, zeros)
return tf.where(denominator_is_zero, zeros, numerator / denominator)
def get_locs(self):
locs = [[x, y]
for y in range(self.height)
for x in range(self.width)]
return tf.to_float(locs)
def build_gcnn_graph(self):
config = self.config
vocab_size = self.vocab.vocab_size
self.global_step = tf.get_variable("global_step", [],
tf.int32,
initializer=tf.zeros_initializer,
trainable=False)
with tf.name_scope('input'):
self.x, self.y, self.w = self.iterator.get_next()
# self.x = tf.placeholder(tf.int32, [config.batch_size, config.num_steps])
# self.y = tf.placeholder(tf.int32, [config.batch_size, config.num_steps])
# self.w = tf.placeholder(tf.int32, [config.batch_size, config.num_steps])
paddings = tf.constant([[0, 0], [config.filter_w // 2, 0]])
self.padded_x = tf.pad(self.x, paddings, "CONSTANT")
paddings = tf.constant([[0, 0], [0, config.filter_w // 2]])
self.padded_y = tf.pad(self.y, paddings, "CONSTANT")
self.padded_w = tf.pad(self.w, paddings, "CONSTANT")
self.keep_prob = tf.get_variable('keep_prob', [],
dtype=tf.float32,
trainable=False)
self.new_keep_prob = tf.placeholder(tf.float32,
shape=[],
name="new_keep_prob")
self.keep_prob_update = tf.assign(self.keep_prob,
self.new_keep_prob)
self.lr = tf.get_variable('lr', [],
dtype=tf.float32,
trainable=False)
self.new_lr = tf.placeholder(tf.float32, shape=[], name="new_lr")
self.lr_update = tf.assign(self.lr, self.new_lr)
with tf.name_scope('embedding'):
self.embed = tf.get_variable('embedding',
shape=[vocab_size, config.embed_size],
dtype=tf.float32)
self.embed_x = tf.nn.embedding_lookup(self.embed, self.padded_x)
if config.keep_prob < 1.0:
self.embed_x = tf.nn.dropout(self.embed_x, config.keep_prob)
with tf.name_scope('gcnn'):
width = config.num_steps + config.filter_w // 2
self.embed_x = tf.reshape(
self.embed_x, [config.batch_size, width, config.embed_size])
h = self.embed_x
for i in range(config.num_layers + 1):
fanin_depth = h.get_shape()[-1]
filter_size = config.filter_size
shape = (config.filter_w, fanin_depth, filter_size)
with tf.variable_scope('layer_%d' % i):
with tf.variable_scope('linear'):
W = tf.get_variable(
'W', shape, tf.float32,
tf.random_normal_initializer(0.0, 0.1))
b = tf.get_variable('b', filter_size, tf.float32,
tf.constant_initializer(1.0))
conv_w = tf.add(
tf.nn.conv1d(h, W, stride=1, padding='SAME'), b)
with tf.variable_scope('gated'):
W = tf.get_variable(
'W', shape, tf.float32,
tf.random_normal_initializer(0.0, 0.1))
b = tf.get_variable('b', filter_size, tf.float32,
tf.constant_initializer(1.0))
conv_v = tf.add(
tf.nn.conv1d(h, W, stride=1, padding='SAME'), b)
h = conv_w * tf.sigmoid(conv_v)
if i == 0:
res_input = h
elif i % config.block_size == 0:
h += res_input
res_input = h
self.outputs = tf.reshape(
h, [config.batch_size * width, config.filter_size])
with tf.name_scope('softmax'):
self.softmax_w = tf.get_variable('softmax_w',
[vocab_size, config.filter_size],
dtype=tf.float32)
self.softmax_b = tf.get_variable('softmax_b', [vocab_size],
dtype=tf.float32)
with tf.name_scope('loss'):
if config.num_sampled > 0:
labels = tf.reshape(self.padded_y,
[config.batch_size * width, 1])
self.loss = tf.nn.sampled_softmax_loss(
weights=self.softmax_w,
biases=self.softmax_b,
labels=labels,
inputs=self.outputs,
num_sampled=config.num_sampled,
num_classes=vocab_size,
partition_strategy="div")
else:
labels = tf.reshape(self.padded_y, [config.batch_size * width])
logits = tf.matmul(self.outputs, tf.transpose(self.softmax_w))
logits = tf.nn.bias_add(logits, self.softmax_b)
self.loss = tf.nn.sparse_softmax_cross_entropy_with_logits(
labels=labels, logits=logits)
self.loss = tf.reduce_mean(
tf.reshape(self.loss, [width, config.batch_size]) * tf.reshape(
tf.to_float(self.padded_w), [width, config.batch_size]),
axis=1)
self.loss = tf.reshape(self.loss, [width])
self.loss = tf.reduce_sum(self.loss)
with tf.name_scope('optimize'):
tvars = tf.trainable_variables()
grads, _ = tf.clip_by_global_norm(tf.gradients(self.loss, tvars),
config.max_grad_norm)
optimizer = tf.train.GradientDescentOptimizer(self.lr)
self.train_op = optimizer.apply_gradients(
zip(grads, tvars), global_step=self.global_step)
with tf.name_scope('ema'):
gcnn_vars = tf.get_collection(tf.GraphKeys.TRAINABLE_VARIABLES,
".*gcnn.*")
ema = tf.train.ExponentialMovingAverage(decay=0.999)
self.train_op = tf.group(*[self.train_op, ema.apply(gcnn_vars)])
def main(args):
debug = (args.debug == 'True')
print(args)
np.random.seed(args.seed)
with tf.Graph().as_default():
train_dataset, num_train_file = DateSet(args.file_list, args, debug)
test_dataset, num_test_file = DateSet(args.test_list, args, debug)
list_ops = {}
batch_train_dataset = train_dataset.batch(args.batch_size).repeat()
train_iterator = batch_train_dataset.make_one_shot_iterator()
train_next_element = train_iterator.get_next()
batch_test_dataset = test_dataset.batch(args.batch_size).repeat()
test_iterator = batch_test_dataset.make_one_shot_iterator()
test_next_element = test_iterator.get_next()
list_ops['num_train_file'] = num_train_file
list_ops['num_test_file'] = num_test_file
model_dir = args.model_dir
# if 'test' in model_dir and debug and os.path.exists(model_dir):
# import shutil
# shutil.rmtree(model_dir)
# assert not os.path.exists(model_dir)
# os.mkdir(model_dir)
print('Total number of examples: {}'.format(num_train_file))
print('Test number of examples: {}'.format(num_test_file))
print('Model dir: {}'.format(model_dir))
tf.set_random_seed(args.seed)
global_step = tf.Variable(0, trainable=False)
list_ops['global_step'] = global_step
list_ops['train_dataset'] = train_dataset
list_ops['test_dataset'] = test_dataset
list_ops['train_next_element'] = train_next_element
list_ops['test_next_element'] = test_next_element
epoch_size = num_train_file // args.batch_size
print('Number of batches per epoch: {}'.format(epoch_size))
image_batch = tf.placeholder(tf.float32, shape=(None, args.image_size, args.image_size, 3),\
name='image_batch')
landmark_batch = tf.placeholder(tf.float32,
shape=(None, 196),
name='landmark_batch')
attribute_batch = tf.placeholder(tf.int32,
shape=(None, 6),
name='attribute_batch')
euler_angles_gt_batch = tf.placeholder(tf.float32,
shape=(None, 3),
name='euler_angles_gt_batch')
list_ops['image_batch'] = image_batch
list_ops['landmark_batch'] = landmark_batch
list_ops['attribute_batch'] = attribute_batch
list_ops['euler_angles_gt_batch'] = euler_angles_gt_batch
phase_train_placeholder = tf.placeholder(tf.bool, name='phase_train')
list_ops['phase_train_placeholder'] = phase_train_placeholder
print('Building training graph.')
# total_loss, landmarks, heatmaps_loss, heatmaps= create_model(image_batch, landmark_batch,\
# phase_train_placeholder, args)
landmarks_pre, landmarks_loss, euler_angles_pre = create_model(image_batch, landmark_batch,\
phase_train_placeholder, args)
attributes_w_n = tf.to_float(attribute_batch[:, 1:6])
# _num = attributes_w_n.shape[0]
mat_ratio = tf.reduce_mean(attributes_w_n, axis=0)
mat_ratio = tf.map_fn(
lambda x:
(tf.cond(x > 0, lambda: 1 / x, lambda: float(args.batch_size))),
mat_ratio)
attributes_w_n = tf.convert_to_tensor(attributes_w_n * mat_ratio)
attributes_w_n = tf.reduce_sum(attributes_w_n, axis=1)
list_ops['attributes_w_n_batch'] = attributes_w_n
L2_loss = tf.add_n(tf.losses.get_regularization_losses())
_sum_k = tf.reduce_sum(tf.map_fn(
lambda x: 1 - tf.cos(abs(x)),
euler_angles_gt_batch - euler_angles_pre),
axis=1)
loss_sum = tf.reduce_sum(tf.square(landmark_batch - landmarks_pre),
axis=1)
loss_sum = tf.reduce_mean(loss_sum * _sum_k * attributes_w_n)
loss_sum += L2_loss
train_op, lr_op = train_model(loss_sum, global_step, num_train_file,
args)
list_ops['landmarks'] = landmarks_pre
list_ops['L2_loss'] = L2_loss
list_ops['loss'] = loss_sum
list_ops['train_op'] = train_op
list_ops['lr_op'] = lr_op
test_mean_error = tf.Variable(tf.constant(0.0),
dtype=tf.float32,
name='ME')
test_failure_rate = tf.Variable(tf.constant(0.0),
dtype=tf.float32,
name='FR')
test_10_loss = tf.Variable(tf.constant(0.0),
dtype=tf.float32,
name='TestLoss')
train_loss = tf.Variable(tf.constant(0.0),
dtype=tf.float32,
name='TrainLoss')
train_loss_l2 = tf.Variable(tf.constant(0.0),
dtype=tf.float32,
name='TrainLoss2')
tf.summary.scalar('test_mean_error', test_mean_error)
tf.summary.scalar('test_failure_rate', test_failure_rate)
tf.summary.scalar('test_10_loss', test_10_loss)
tf.summary.scalar('train_loss', train_loss)
tf.summary.scalar('train_loss_l2', train_loss_l2)
save_params = tf.trainable_variables()
saver = tf.train.Saver(save_params, max_to_keep=None)
gpu_options = tf.GPUOptions(per_process_gpu_memory_fraction=1.0)
sess = tf.Session(config=tf.ConfigProto(gpu_options=gpu_options,
allow_soft_placement=False,
log_device_placement=False))
sess.run(tf.global_variables_initializer())
sess.run(tf.local_variables_initializer())
with sess.as_default():
epoch_start = 0
if args.pretrained_model:
pretrained_model = args.pretrained_model
if (not os.path.isdir(pretrained_model)):
print('Restoring pretrained model: {}'.format(
pretrained_model))
saver.restore(sess, args.pretrained_model)
else:
print('Model directory: {}'.format(pretrained_model))
ckpt = tf.train.get_checkpoint_state(pretrained_model)
model_path = ckpt.model_checkpoint_path
assert (ckpt and model_path)
epoch_start = int(
model_path[model_path.find('model.ckpt-') + 11:]) + 1
print('Checkpoint file: {}'.format(model_path))
saver.restore(sess, model_path)
# if args.save_image_example:
# save_image_example(sess, list_ops, args)
print('Running train.')
merged = tf.summary.merge_all()
train_write = tf.summary.FileWriter(log_dir, sess.graph)
for epoch in range(epoch_start, args.max_epoch):
start = time.time()
train_L, train_L2 = train(sess, epoch_size, epoch, list_ops)
print("train time: {}".format(time.time() - start))
checkpoint_path = os.path.join(model_dir, 'model.ckpt')
metagraph_path = os.path.join(model_dir, 'model.meta')
saver.save(sess,
checkpoint_path,
global_step=epoch,
write_meta_graph=False)
if not os.path.exists(metagraph_path):
saver.export_meta_graph(metagraph_path)
start = time.time()
test_ME, test_FR, test_loss = test(sess, list_ops, args)
print("test time: {}".format(time.time() - start))
summary, _, _, _, _, _ = sess.run([
merged,
test_mean_error.assign(test_ME),
test_failure_rate.assign(test_FR),
test_10_loss.assign(test_loss),
train_loss.assign(train_L),
train_loss_l2.assign(train_L2)
])
train_write.add_summary(summary, epoch)
def _build(self):
inpts = [self.tiled_obs]
if self.coords is not None:
inpts.append(self.tiled_coords)
self.outputs = self.sequence(*inpts)
self.__dict__.update(self.outputs)
log_weights = tf.reduce_sum(self.outputs.log_weights_per_timestep, 0)
self.log_weights = tf.reshape(log_weights, (self.batch_size, self.k_particles))
self.elbo_vae = tf.reduce_mean(self.log_weights)
self.elbo_iwae_per_example = targets.iwae(self.log_weights)
self.elbo_iwae = tf.reduce_mean(self.elbo_iwae_per_example)
self.normalised_elbo_vae = self.elbo_vae / tf.to_float(self.n_timesteps)
self.normalised_elbo_iwae = self.elbo_iwae / tf.to_float(self.n_timesteps)
tf.summary.scalar('normalised_vae', self.normalised_elbo_vae)
tf.summary.scalar('normalised_iwae', self.normalised_elbo_iwae)
self.importance_weights = tf.stop_gradient(tf.nn.softmax(self.log_weights, -1))
self.ess = ops.ess(self.importance_weights, average=True)
self.iw_distrib = tf.distributions.Categorical(probs=self.importance_weights)
self.iw_resampling_idx = self.iw_distrib.sample()
# Logging
self._log_resampled(self.data_ll_per_sample, 'data_ll')
self._log_resampled(self.log_p_z_per_sample, 'log_p_z')
self._log_resampled(self.log_q_z_given_x_per_sample, 'log_q_z_given_x')
self._log_resampled(self.kl_per_sample, 'kl')
# Mean squared error between inpt and mean of output distribution
inpt_obs = self.tiled_obs
if inpt_obs.shape[-1] == 1:
inpt_obs = tf.squeeze(inpt_obs, -1)
axes = [0] + list(range(inpt_obs.shape.ndims)[2:])
self.mse_per_sample = tf.reduce_mean((inpt_obs - self.canvas) ** 2, axes)
self._log_resampled(self.mse_per_sample, 'mse')
self.raw_mse = tf.reduce_mean(self.mse_per_sample)
tf.summary.scalar('raw_mse', self.raw_mse)
if hasattr(self, 'num_steps_per_sample'):
self._log_resampled(self.num_steps_per_sample, 'num_steps')
if self.gt_presence is not None:
self.gt_num_steps = tf.reduce_sum(self.gt_presence, -1)
num_steps_per_sample = tf.reshape(self.num_steps_per_sample, (-1, self.batch_size, self.k_particles))
gt_num_steps = tf.expand_dims(self.gt_num_steps, -1)
self.num_step_accuracy_per_example = tf.to_float(tf.equal(gt_num_steps, num_steps_per_sample))
self.raw_num_step_accuracy = tf.reduce_mean(self.num_step_accuracy_per_example)
self.num_step_accuracy = self._imp_weighted_mean(self.num_step_accuracy_per_example)
tf.summary.scalar('num_step_acc', self.num_step_accuracy)
# For rendering
resampled_names = 'obj_id canvas glimpse presence_prob presence presence_logit where'.split()
for name in resampled_names:
try:
setattr(self, 'resampled_' + name, self.resample(getattr(self, name), axis=1))
except AttributeError:
pass
try:
self._log_resampled(self.num_disc_steps_per_sample, 'num_disc_steps')
self._log_resampled(self.num_prop_steps_per_sample, 'num_prop_steps')
except AttributeError:
pass
def __init__(self, *, policy, ob_space, ac_space, nbatch_act, nbatch_train,
nsteps, ent_coef, vf_coef, max_grad_norm):
sess = tf.get_default_session()
filmObj = filmInit(sess, nenvs)
act_model = policy(sess, ob_space, ac_space, nbatch_act, 1, filmObj, reuse=False,st = "act")
# print('Shape of obs in the model is ',ob_space.shape)
train_model = policy(sess, ob_space, ac_space, nbatch_train, nsteps, filmObj, reuse=True,st = "train")
self.filmObj = filmObj
A = train_model.pdtype.sample_placeholder([None])
ADV = tf.placeholder(tf.float32, [None])
R = tf.placeholder(tf.float32, [None])
OLDNEGLOGPAC = tf.placeholder(tf.float32, [None])
OLDVPRED = tf.placeholder(tf.float32, [None])
LR = tf.placeholder(tf.float32, [])
CLIPRANGE = tf.placeholder(tf.float32, [])
neglogpac = train_model.pd.neglogp(A)
entropy = tf.reduce_mean(train_model.pd.entropy())
vpred = train_model.vf
vpredclipped = OLDVPRED + tf.clip_by_value(train_model.vf - OLDVPRED, - CLIPRANGE, CLIPRANGE)
vf_losses1 = tf.square(vpred - R)
vf_losses2 = tf.square(vpredclipped - R)
vf_loss = .5 * tf.reduce_mean(tf.maximum(vf_losses1, vf_losses2))
ratio = tf.exp(OLDNEGLOGPAC - neglogpac)
pg_losses = -ADV * ratio
pg_losses2 = -ADV * tf.clip_by_value(ratio, 1.0 - CLIPRANGE, 1.0 + CLIPRANGE)
pg_loss = tf.reduce_mean(tf.maximum(pg_losses, pg_losses2))
approxkl = .5 * tf.reduce_mean(tf.square(neglogpac - OLDNEGLOGPAC))
clipfrac = tf.reduce_mean(tf.to_float(tf.greater(tf.abs(ratio - 1.0), CLIPRANGE)))
loss = pg_loss - entropy * ent_coef + vf_loss * vf_coef
with tf.variable_scope('model'):
params = tf.trainable_variables()
grads = tf.gradients(loss, params)
if max_grad_norm is not None:
grads, _grad_norm = tf.clip_by_global_norm(grads, max_grad_norm)
grads = list(zip(grads, params))
print('print this before using the optimizer')
trainer = tf.train.AdamOptimizer(learning_rate=LR, epsilon=1e-5)
_train = trainer.apply_gradients(grads)
# def reinit():
# filmObj.reinit()
def train(idx,lr, cliprange, obs, returns, masks, actions, values, neglogpacs, states=None):
advs = returns - values
advs = (advs - advs.mean()) / (advs.std() + 1e-8)
td_map = {train_model.X:obs,train_model.index :[idx], A:actions, ADV:advs, R:returns, LR:lr,
CLIPRANGE:cliprange, OLDNEGLOGPAC:neglogpacs, OLDVPRED:values}
if states is not None:
td_map[train_model.S] = states
td_map[train_model.M] = masks
return sess.run(
[pg_loss, vf_loss, entropy, approxkl, clipfrac, _train],
td_map
)[:-1]
self.loss_names = ['policy_loss', 'value_loss', 'policy_entropy', 'approxkl', 'clipfrac']
def save(save_path):
saver = tf.train.Saver()
saver.save(sess, save_path + '_tf')
def load(load_path):
saver = tf.train.Saver()
print('Loading ' + load_path + '_tf')
saver.restore(sess, load_path + '_tf')
self.train = train
self.train_model = train_model
self.act_model = act_model
self.step = act_model.step
self.value = act_model.value
self.initial_state = act_model.initial_state
self.save = save
self.load = load
tf.global_variables_initializer().run(session=sess) #pylint: disable=E1101
2.可微分。 保证定义域任意一点可导，从而使得梯度下降法能够正常使用来自这类激活函数的输出。 """ # 1.tf.nn.relu ，修正线性单元也被称为斜坡函数，函数图形与滑板斜坡非常相似 # ReLU是分段线性的。 # 输入为非负：输出与输入相同 # 输入为负 : 输出为0 # 优点：不受梯度消失影响。且取值范围[0,+∞] # 缺点：较大学习效率，易受到饱和神经元影响 features = tf.range(-2, 3) sess = tf.Session() print(sess.run([features, tf.nn.relu(features)])) # [array([-2, -1, 0, 1, 2]), array([0, 0, 0, 1, 2])] # 2.tf.sigmoid，返回值[0.0,1.0].输入较大趋于1，输入较小趋于0. # tf.sigmoid(tf.nn.sigmoid) 目前仅支持接收浮点 features0 = tf.to_float(tf.range(-1, 3)) print(sess.run([features0, tf.sigmoid(features0)])) # [array([-1., 0., 1., 2.], dtype=float32), array([0.26894143, 0.5 , 0.7310586 , 0.880797 ], dtype=float32)] # 3.tf.tanh,双曲正切函数(tanh)与tf.sigmoid非常接近，优缺点相类似。 # 值域为[-1,1]，特定网络架构中能够输出赋值的能力可能非常有用 # tf.tanh(tf.nn.tanh)目前只支持浮点类型输入 features1 = tf.to_float(tf.range(-1, 3)) print(sess.run([features1, tf.tanh(features1)])) # [array([-1., 0., 1., 2.], dtype=float32), array([-0.7615942, 0. , 0.7615942, 0.9640276], dtype=float32)] # 4.tf.nn.dropout,根据某个可配置概率输出设为0.0 # 引入少量随机性有助于训练 # 场景:当要学习一些模式与其邻近特征耦合过强，将输出添加少量噪声 # 这种模型应该只在训练层使用。如果在测试阶段使用该层，引入随机噪声将对齐结果产生误导。
def noisy_top_k_gating(x,
num_experts,
train,
k=2,
initializer=tf.zeros_initializer(),
noisy_gating=True,
noise_epsilon=1e-2,
name=None):
"""Noisy top-k gating.
See paper: https://arxiv.org/abs/1701.06538.
Args:
x: input Tensor with shape [batch_size, input_size]
num_experts: an integer
train: a boolean - we only add noise at training time.
k: an integer - number of experts per example
initializer: an initializer
noisy_gating: a boolean
noise_epsilon: a float
name: an optional string
Returns:
gates: a Tensor with shape [batch_size, num_experts]
load: a Tensor with shape [num_experts]
"""
with tf.variable_scope(name, default_name="noisy_top_k_gating"):
input_size = x.get_shape().as_list()[-1]
w_gate = tf.get_variable("w_gate", [input_size, num_experts],
tf.float32, initializer)
if noisy_gating:
w_noise = tf.get_variable("w_noise", [input_size, num_experts],
tf.float32, initializer)
clean_logits = tf.matmul(x, w_gate)
if noisy_gating:
raw_noise_stddev = tf.matmul(x, w_noise)
noise_stddev = (
(tf.nn.softplus(raw_noise_stddev) + noise_epsilon) *
(tf.to_float(train)))
noisy_logits = clean_logits + (
tf.random_normal(tf.shape(clean_logits)) * noise_stddev)
logits = noisy_logits
if common_layers.should_generate_summaries():
tf.summary.histogram("noisy_logits", noisy_logits)
tf.summary.histogram("noise_stddev", noise_stddev)
else:
logits = clean_logits
top_logits, top_indices = _my_top_k(logits, min(k + 1, num_experts))
# top k logits has shape [batch, k]
top_k_logits = tf.slice(top_logits, [0, 0], [-1, k])
top_k_indices = tf.slice(top_indices, [0, 0], [-1, k])
top_k_gates = tf.nn.softmax(top_k_logits)
# This will be a `Tensor` of shape `[batch_size, n]`, with zeros in the
# positions corresponding to all but the top k experts per example.
gates = _rowwise_unsorted_segment_sum(top_k_gates, top_k_indices,
num_experts)
if noisy_gating and k < num_experts:
load = tf.reduce_sum(
_prob_in_top_k(clean_logits, noisy_logits, noise_stddev,
top_logits, k), 0)
else:
load = _gates_to_load(gates)
if common_layers.should_generate_summaries():
tf.summary.histogram("importance", tf.reduce_sum(gates, 0))
tf.summary.histogram("load", load)
return gates, load
def call(self, x):
input_image, y_pred, y_true, true_boxes = x
# adjust the shape of the y_predict [batch, grid_h, grid_w, 3, 4+1+nb_class]
y_pred = tf.reshape(y_pred, tf.concat([tf.shape(y_pred)[:3], tf.constant([3, -1])], axis=0))
# initialize the masks
object_mask = tf.expand_dims(y_true[..., 4], 4)
# the variable to keep track of number of batches processed
batch_seen = tf.Variable(0.)
# compute grid factor and net factor
grid_h = tf.shape(y_true)[1]
grid_w = tf.shape(y_true)[2]
grid_factor = tf.reshape(tf.cast([grid_w, grid_h], tf.float32), [1,1,1,1,2])
net_h = tf.shape(input_image)[1]
net_w = tf.shape(input_image)[2]
net_factor = tf.reshape(tf.cast([net_w, net_h], tf.float32), [1,1,1,1,2])
"""
Adjust prediction
"""
pred_box_xy = (self.cell_grid[:,:grid_h,:grid_w,:,:] + tf.sigmoid(y_pred[..., :2])) # sigma(t_xy) + c_xy
pred_box_wh = y_pred[..., 2:4] # t_wh
pred_box_conf = tf.expand_dims(tf.sigmoid(y_pred[..., 4]), 4) # adjust confidence
pred_box_class = y_pred[..., 5:] # adjust class probabilities
"""
Adjust ground truth
"""
true_box_xy = y_true[..., 0:2] # (sigma(t_xy) + c_xy)
true_box_wh = y_true[..., 2:4] # t_wh
true_box_conf = tf.expand_dims(y_true[..., 4], 4)
true_box_class = tf.argmax(y_true[..., 5:], -1)
"""
Compare each predicted box to all true boxes
"""
# initially, drag all objectness of all boxes to 0
conf_delta = pred_box_conf - 0
# then, ignore the boxes which have good overlap with some true box
true_xy = true_boxes[..., 0:2] / grid_factor
true_wh = true_boxes[..., 2:4] / net_factor
true_wh_half = true_wh / 2.
true_mins = true_xy - true_wh_half
true_maxes = true_xy + true_wh_half
pred_xy = tf.expand_dims(pred_box_xy / grid_factor, 4)
pred_wh = tf.expand_dims(tf.exp(pred_box_wh) * self.anchors / net_factor, 4)
pred_wh_half = pred_wh / 2.
pred_mins = pred_xy - pred_wh_half
pred_maxes = pred_xy + pred_wh_half
intersect_mins = tf.maximum(pred_mins, true_mins)
intersect_maxes = tf.minimum(pred_maxes, true_maxes)
intersect_wh = tf.maximum(intersect_maxes - intersect_mins, 0.)
intersect_areas = intersect_wh[..., 0] * intersect_wh[..., 1]
true_areas = true_wh[..., 0] * true_wh[..., 1]
pred_areas = pred_wh[..., 0] * pred_wh[..., 1]
union_areas = pred_areas + true_areas - intersect_areas
iou_scores = tf.truediv(intersect_areas, union_areas)
best_ious = tf.reduce_max(iou_scores, axis=4)
conf_delta *= tf.expand_dims(tf.to_float(best_ious < self.ignore_thresh), 4)
"""
Compute some online statistics
"""
true_xy = true_box_xy / grid_factor
true_wh = tf.exp(true_box_wh) * self.anchors / net_factor
true_wh_half = true_wh / 2.
true_mins = true_xy - true_wh_half
true_maxes = true_xy + true_wh_half
pred_xy = pred_box_xy / grid_factor
pred_wh = tf.exp(pred_box_wh) * self.anchors / net_factor
pred_wh_half = pred_wh / 2.
pred_mins = pred_xy - pred_wh_half
pred_maxes = pred_xy + pred_wh_half
intersect_mins = tf.maximum(pred_mins, true_mins)
intersect_maxes = tf.minimum(pred_maxes, true_maxes)
intersect_wh = tf.maximum(intersect_maxes - intersect_mins, 0.)
intersect_areas = intersect_wh[..., 0] * intersect_wh[..., 1]
true_areas = true_wh[..., 0] * true_wh[..., 1]
pred_areas = pred_wh[..., 0] * pred_wh[..., 1]
union_areas = pred_areas + true_areas - intersect_areas
iou_scores = tf.truediv(intersect_areas, union_areas)
iou_scores = object_mask * tf.expand_dims(iou_scores, 4)
count = tf.reduce_sum(object_mask)
count_noobj = tf.reduce_sum(1 - object_mask)
detect_mask = tf.to_float((pred_box_conf*object_mask) >= 0.5)
class_mask = tf.expand_dims(tf.to_float(tf.equal(tf.argmax(pred_box_class, -1), true_box_class)), 4)
recall50 = tf.reduce_sum(tf.to_float(iou_scores >= 0.5 ) * detect_mask * class_mask) / (count + 1e-3)
recall75 = tf.reduce_sum(tf.to_float(iou_scores >= 0.75) * detect_mask * class_mask) / (count + 1e-3)
avg_iou = tf.reduce_sum(iou_scores) / (count + 1e-3)
avg_obj = tf.reduce_sum(pred_box_conf * object_mask) / (count + 1e-3)
avg_noobj = tf.reduce_sum(pred_box_conf * (1-object_mask)) / (count_noobj + 1e-3)
avg_cat = tf.reduce_sum(object_mask * class_mask) / (count + 1e-3)
"""
Warm-up training
"""
batch_seen = tf.assign_add(batch_seen, 1.)
true_box_xy, true_box_wh, xywh_mask = tf.cond(tf.less(batch_seen, self.warmup_batches+1),
lambda: [true_box_xy + (0.5 + self.cell_grid[:,:grid_h,:grid_w,:,:]) * (1-object_mask),
true_box_wh + tf.zeros_like(true_box_wh) * (1-object_mask),
tf.ones_like(object_mask)],
lambda: [true_box_xy,
true_box_wh,
object_mask])
"""
Compare each true box to all anchor boxes
"""
wh_scale = tf.exp(true_box_wh) * self.anchors / net_factor
wh_scale = tf.expand_dims(2 - wh_scale[..., 0] * wh_scale[..., 1], axis=4) # the smaller the box, the bigger the scale
xy_delta = xywh_mask * (pred_box_xy-true_box_xy) * wh_scale * self.xywh_scale
wh_delta = xywh_mask * (pred_box_wh-true_box_wh) * wh_scale * self.xywh_scale
conf_delta = object_mask * (pred_box_conf-true_box_conf) * self.obj_scale + (1-object_mask)*10 * conf_delta * self.noobj_scale
class_delta = object_mask * \
tf.expand_dims(tf.nn.sparse_softmax_cross_entropy_with_logits(labels=true_box_class, logits=pred_box_class), 4) * \
self.class_scale
loss_xy = tf.reduce_sum(tf.square(xy_delta), list(range(1,5)))
loss_wh = tf.reduce_sum(tf.square(wh_delta), list(range(1,5)))
loss_conf = tf.reduce_sum(tf.square(conf_delta), list(range(1,5)))
loss_class = tf.reduce_sum(class_delta, list(range(1,5)))
loss = loss_xy + loss_wh + loss_conf + loss_class
loss = tf.Print(loss, [grid_h, avg_obj], message='avg_obj \t\t', summarize=1000)
loss = tf.Print(loss, [grid_h, avg_noobj], message='avg_noobj \t\t', summarize=1000)
loss = tf.Print(loss, [grid_h, avg_iou], message='avg_iou \t\t', summarize=1000)
loss = tf.Print(loss, [grid_h, avg_cat], message='avg_cat \t\t', summarize=1000)
loss = tf.Print(loss, [grid_h, recall50], message='recall50 \t', summarize=1000)
loss = tf.Print(loss, [grid_h, recall75], message='recall75 \t', summarize=1000)
loss = tf.Print(loss, [grid_h, count], message='count \t', summarize=1000)
loss = tf.Print(loss, [grid_h, tf.reduce_sum(loss_xy),
tf.reduce_sum(loss_wh),
tf.reduce_sum(loss_conf),
tf.reduce_sum(loss_class)], message='loss xy, wh, conf, class: \t', summarize=1000)
return loss*self.grid_scale
