def fn():
for field in standard_fields.get_input_object_fields():
if field in inputs:
inputs[field] = tf.boolean_mask(inputs[field], valid_mask)
for field in standard_fields.get_output_object_fields():
if field in outputs:
outputs[field] = tf.boolean_mask(outputs[field], valid_mask)
return _box_corner_distance_loss(
loss_type=loss_type,
is_balanced=is_balanced,
input_boxes_length=inputs[
standard_fields.InputDataFields.objects_length],
input_boxes_height=inputs[
standard_fields.InputDataFields.objects_height],
input_boxes_width=inputs[standard_fields.InputDataFields.objects_width],
input_boxes_center=inputs[
standard_fields.InputDataFields.objects_center],
input_boxes_rotation_matrix=inputs[
standard_fields.InputDataFields.objects_rotation_matrix],
input_boxes_instance_id=inputs[
standard_fields.InputDataFields.objects_instance_id],
output_boxes_length=outputs[
standard_fields.DetectionResultFields.objects_length],
output_boxes_height=outputs[
standard_fields.DetectionResultFields.objects_height],
output_boxes_width=outputs[
standard_fields.DetectionResultFields.objects_width],
output_boxes_center=outputs[
standard_fields.DetectionResultFields.objects_center],
output_boxes_rotation_matrix=outputs[
standard_fields.DetectionResultFields.objects_rotation_matrix],
delta=delta)
def update_state(self, inputs, outputs):
"""Function that updates the metric state at each example.
Args:
inputs: A dictionary containing input tensors.
outputs: A dictionary containing output tensors.
Returns:
Update op.
"""
detections_score = tf.reshape(
outputs[standard_fields.DetectionResultFields.objects_score], [-1])
detections_class = tf.reshape(
outputs[standard_fields.DetectionResultFields.objects_class], [-1])
num_detections = tf.shape(detections_score)[0]
detections_instance_mask = tf.reshape(
outputs[
standard_fields.DetectionResultFields.instance_segments_voxel_mask],
[num_detections, -1])
gt_class = tf.reshape(inputs[standard_fields.InputDataFields.objects_class],
[-1])
num_gt = tf.shape(gt_class)[0]
gt_voxel_instance_ids = tf.reshape(
inputs[standard_fields.InputDataFields.object_instance_id_voxels], [-1])
gt_instance_masks = tf.transpose(
tf.one_hot(gt_voxel_instance_ids - 1, depth=num_gt, dtype=tf.float32))
for c in self.class_range:
gt_mask_c = tf.equal(gt_class, c)
num_gt_c = tf.math.reduce_sum(tf.cast(gt_mask_c, dtype=tf.int32))
gt_instance_masks_c = tf.boolean_mask(gt_instance_masks, gt_mask_c)
detections_mask_c = tf.equal(detections_class, c)
num_detections_c = tf.math.reduce_sum(
tf.cast(detections_mask_c, dtype=tf.int32))
if num_detections_c == 0:
continue
det_scores_c = tf.boolean_mask(detections_score, detections_mask_c)
det_instance_mask_c = tf.boolean_mask(detections_instance_mask,
detections_mask_c)
det_scores_c, sorted_indices = tf.math.top_k(
det_scores_c, k=num_detections_c)
det_instance_mask_c = tf.gather(det_instance_mask_c, sorted_indices)
tp_c = tf.zeros([num_detections_c], dtype=tf.int32)
if num_gt_c > 0:
ious_c = instance_segmentation_utils.points_mask_iou(
masks1=gt_instance_masks_c, masks2=det_instance_mask_c)
max_overlap_gt_ids = tf.cast(
tf.math.argmax(ious_c, axis=0), dtype=tf.int32)
is_gt_box_detected = tf.zeros([num_gt_c], dtype=tf.int32)
for i in tf.range(num_detections_c):
gt_id = max_overlap_gt_ids[i]
if (ious_c[gt_id, i] > self.iou_threshold and
is_gt_box_detected[gt_id] == 0):
tp_c = tf.maximum(
tf.one_hot(i, num_detections_c, dtype=tf.int32), tp_c)
is_gt_box_detected = tf.maximum(
tf.one_hot(gt_id, num_gt_c, dtype=tf.int32), is_gt_box_detected)
self.tp[c] = tf.concat([self.tp[c], tp_c], axis=0)
self.scores[c] = tf.concat([self.scores[c], det_scores_c], axis=0)
self.num_gt[c] += num_gt_c
return tf.no_op()
def randomly_crop_points(mesh_inputs,
view_indices_2d_inputs,
x_random_crop_size,
y_random_crop_size,
epsilon=1e-5):
"""Randomly crops points.
Args:
mesh_inputs: A dictionary containing input mesh (point) tensors.
view_indices_2d_inputs: A dictionary containing input point to view
correspondence tensors.
x_random_crop_size: Size of the random crop in x dimension. If None, random
crop will not take place on x dimension.
y_random_crop_size: Size of the random crop in y dimension. If None, random
crop will not take place on y dimension.
epsilon: Epsilon (a very small value) used to add as a small margin to
thresholds.
"""
if x_random_crop_size is None and y_random_crop_size is None:
return
points = mesh_inputs[standard_fields.InputDataFields.point_positions]
num_points = tf.shape(points)[0]
# Pick a random point
if x_random_crop_size is not None or y_random_crop_size is not None:
random_index = tf.random.uniform([],
minval=0,
maxval=num_points,
dtype=tf.int32)
center_x = points[random_index, 0]
center_y = points[random_index, 1]
points_x = points[:, 0]
points_y = points[:, 1]
min_x = tf.reduce_min(points_x) - epsilon
max_x = tf.reduce_max(points_x) + epsilon
min_y = tf.reduce_min(points_y) - epsilon
max_y = tf.reduce_max(points_y) + epsilon
if x_random_crop_size is not None:
min_x = center_x - x_random_crop_size / 2.0 - epsilon
max_x = center_x + x_random_crop_size / 2.0 + epsilon
if y_random_crop_size is not None:
min_y = center_y - y_random_crop_size / 2.0 - epsilon
max_y = center_y + y_random_crop_size / 2.0 + epsilon
x_mask = tf.logical_and(tf.greater(points_x, min_x), tf.less(points_x, max_x))
y_mask = tf.logical_and(tf.greater(points_y, min_y), tf.less(points_y, max_y))
points_mask = tf.logical_and(x_mask, y_mask)
for key in sorted(mesh_inputs):
mesh_inputs[key] = tf.boolean_mask(mesh_inputs[key], points_mask)
for key in sorted(view_indices_2d_inputs):
view_indices_2d_inputs[key] = tf.transpose(
tf.boolean_mask(
tf.transpose(view_indices_2d_inputs[key], [1, 0, 2]), points_mask),
[1, 0, 2])
def _prepare_lidar_points(inputs, lidar_names):
"""Integrates and returns the lidar points in vehicle coordinate frame."""
points_position = []
points_intensity = []
points_elongation = []
points_normal = []
points_in_image_frame_xy = []
points_in_image_frame_id = []
for lidar_name in lidar_names:
lidar_location = tf.reshape(
inputs[('lidars/%s/extrinsics/t') % lidar_name], [-1, 3])
inside_no_label_zone = tf.reshape(
inputs[('lidars/%s/pointcloud/inside_nlz' % lidar_name)], [-1])
valid_points_mask = tf.math.logical_not(inside_no_label_zone)
points_position_current_lidar = tf.boolean_mask(
inputs[('lidars/%s/pointcloud/positions' % lidar_name)],
valid_points_mask)
points_position.append(points_position_current_lidar)
points_intensity.append(
tf.boolean_mask(
inputs[('lidars/%s/pointcloud/intensity' % lidar_name)],
valid_points_mask))
points_elongation.append(
tf.boolean_mask(
inputs[('lidars/%s/pointcloud/elongation' % lidar_name)],
valid_points_mask))
points_to_lidar_vectors = lidar_location - points_position_current_lidar
points_normal_direction = points_to_lidar_vectors / tf.expand_dims(
tf.norm(points_to_lidar_vectors, axis=1), axis=1)
points_normal.append(points_normal_direction)
points_in_image_frame_xy.append(
tf.boolean_mask(
inputs['lidars/%s/camera_projections/positions' % lidar_name],
valid_points_mask))
points_in_image_frame_id.append(
tf.boolean_mask(
inputs['lidars/%s/camera_projections/ids' % lidar_name],
valid_points_mask))
points_position = tf.concat(points_position, axis=0)
points_intensity = tf.concat(points_intensity, axis=0)
points_elongation = tf.concat(points_elongation, axis=0)
points_normal = tf.concat(points_normal, axis=0)
points_in_image_frame_xy = tf.concat(points_in_image_frame_xy, axis=0)
points_in_image_frame_id = tf.cast(tf.concat(points_in_image_frame_id,
axis=0),
dtype=tf.int32)
points_in_image_frame_yx = tf.cast(tf.reverse(points_in_image_frame_xy,
axis=[-1]),
dtype=tf.int32)
return (points_position, points_intensity, points_elongation,
points_normal, points_in_image_frame_yx, points_in_image_frame_id)
def convert_to_simclr_episode(support_images=None,
support_labels=None,
support_class_ids=None,
query_images=None,
query_labels=None,
query_class_ids=None):
"""Convert a single episode into a SimCLR Episode."""
# If there were k query examples of class c, keep the first k support
# examples of class c as 'simclr' queries. We do this by assigning an
# id for each image in the query set, implemented as label*1e5+x+1, where
# x is the number of images of the same label with a lower index within
# the query set. We do the same for the support set, which gives us a
# mapping between query and support images which is injective (as long
# as there's enough support-set images of each class).
#
# note: assumes max support label is 10000 - max_images_per_class
query_idx_within_class = tf.cast(
tf.equal(query_labels[tf.newaxis, :], query_labels[:, tf.newaxis]),
tf.int32)
query_idx_within_class = tf.linalg.diag_part(
tf.cumsum(query_idx_within_class, axis=1))
query_uid = query_labels * 10000 + query_idx_within_class
support_idx_within_class = tf.cast(
tf.equal(support_labels[tf.newaxis, :],
support_labels[:, tf.newaxis]), tf.int32)
support_idx_within_class = tf.linalg.diag_part(
tf.cumsum(support_idx_within_class, axis=1))
support_uid = support_labels * 10000 + support_idx_within_class
# compute which support-set images have matches in the query set, and
# discard the rest to produce the new query set.
support_keep = tf.reduce_any(tf.equal(support_uid[:, tf.newaxis],
query_uid[tf.newaxis, :]),
axis=1)
query_images = tf.boolean_mask(support_images, support_keep)
support_labels = tf.range(tf.shape(support_labels)[0],
dtype=support_labels.dtype)
query_labels = tf.boolean_mask(support_labels, support_keep)
query_class_ids = tf.boolean_mask(support_class_ids, support_keep)
# Finally, apply SimCLR augmentation to all images.
# Note simclr only blurs one image.
query_images = simclr_augment(query_images, blur=True)
support_images = simclr_augment(support_images)
return (support_images, support_labels, support_class_ids,
query_images, query_labels, query_class_ids)
def _remove_second_return_lidar_points(mesh_inputs, view_indices_2d_inputs):
"""removes the points that are not lidar first-return ."""
if standard_fields.InputDataFields.point_spin_coordinates not in mesh_inputs:
raise ValueError('spin_coordinates not in mesh_inputs.')
first_return_mask = tf.equal(
tf.cast(mesh_inputs[
standard_fields.InputDataFields.point_spin_coordinates][:, 2],
dtype=tf.int32), 0)
for key in sorted(mesh_inputs):
mesh_inputs[key] = tf.boolean_mask(mesh_inputs[key], first_return_mask)
for key in sorted(view_indices_2d_inputs):
view_indices_2d_inputs[key] = tf.transpose(
tf.boolean_mask(
tf.transpose(view_indices_2d_inputs[key], [1, 0, 2]),
first_return_mask), [1, 0, 2])
def _filter_valid_objects(inputs):
"""Removes the objects that do not contain 3d info.
Args:
inputs: A dictionary containing input tensors.
"""
if standard_fields.InputDataFields.objects_class not in inputs:
return
valid_objects_mask = tf.reshape(
tf.greater(inputs[standard_fields.InputDataFields.objects_class], 0),
[-1])
if standard_fields.InputDataFields.objects_has_3d_info in inputs:
objects_with_3d_info = tf.reshape(
tf.cast(
inputs[standard_fields.InputDataFields.objects_has_3d_info],
dtype=tf.bool), [-1])
valid_objects_mask = tf.logical_and(objects_with_3d_info,
valid_objects_mask)
if standard_fields.InputDataFields.objects_difficulty in inputs:
valid_objects_mask = tf.logical_and(
valid_objects_mask,
tf.greater(
tf.reshape(
inputs[standard_fields.InputDataFields.objects_difficulty],
[-1]), 0))
for key in _OBJECT_KEYS:
if key in inputs:
inputs[key] = tf.boolean_mask(inputs[key], valid_objects_mask)
def experience_to_transitions(experience):
boundary_mask = tf.logical_not(experience.is_boundary()[:, 0])
experience = nest_utils.fast_map_structure(
lambda *x: tf.boolean_mask(*x, boundary_mask), experience)
time_steps, policy_steps, next_time_steps = (
trajectory.experience_to_transitions(experience, True))
actions = policy_steps.action
return time_steps, actions, next_time_steps
def embedding_regularization_loss(inputs,
outputs,
lambda_coef=0.0001,
regularization_type='unit_length',
is_intermediate=False):
"""Classification loss with an iou threshold.
Args:
inputs: A dictionary that contains
num_valid_voxels - A tf.int32 tensor of size [batch_size].
instance_ids - A tf.int32 tensor of size [batch_size, n].
outputs: A dictionart that contains
embeddings - A tf.float32 tensor of size [batch_size, n, f].
lambda_coef: Regularization loss coefficient.
regularization_type: Regularization loss type. Supported values are 'msq'
and 'unit_length'. 'msq' stands for 'mean square' which penalizes the
embedding vectors if they have a length far from zero. 'unit_length'
penalizes the embedding vectors if they have a length far from one.
is_intermediate: True if applied to intermediate predictions;
otherwise, False.
Returns:
A tf.float32 scalar loss tensor.
"""
instance_ids_key = standard_fields.InputDataFields.object_instance_id_voxels
num_voxels_key = standard_fields.InputDataFields.num_valid_voxels
if is_intermediate:
embedding_key = (
standard_fields.DetectionResultFields
.intermediate_instance_embedding_voxels)
else:
embedding_key = (
standard_fields.DetectionResultFields.instance_embedding_voxels)
if instance_ids_key not in inputs:
raise ValueError('instance_ids is missing in inputs.')
if embedding_key not in outputs:
raise ValueError('embedding is missing in outputs.')
if num_voxels_key not in inputs:
raise ValueError('num_voxels is missing in inputs.')
batch_size = inputs[num_voxels_key].get_shape().as_list()[0]
if batch_size is None:
raise ValueError('batch_size is not defined at graph construction time.')
num_valid_voxels = inputs[num_voxels_key]
num_voxels = tf.shape(inputs[instance_ids_key])[1]
valid_mask = tf.less(
tf.tile(tf.expand_dims(tf.range(num_voxels), axis=0), [batch_size, 1]),
tf.expand_dims(num_valid_voxels, axis=1))
valid_mask = tf.reshape(valid_mask, [-1])
embedding_dims = outputs[embedding_key].get_shape().as_list()[-1]
if embedding_dims is None:
raise ValueError(
'Embedding dimension is unknown at graph construction time.')
embedding = tf.reshape(outputs[embedding_key], [-1, embedding_dims])
embedding = tf.boolean_mask(embedding, valid_mask)
return metric_learning_losses.regularization_loss(
embedding=embedding,
lambda_coef=lambda_coef,
regularization_type=regularization_type)
def compute_target_optimal_q(reward, gamma, next_actions, next_q_values,
next_states, terminals):
"""Builds an op used as a target for the Q-value.
This algorithm corresponds to the method "OT" in
Ie et al. https://arxiv.org/abs/1905.12767..
Args:
reward: [batch_size] tensor, the immediate reward.
gamma: float, discount factor with the usual RL meaning.
next_actions: [batch_size, slate_size] tensor, the next slate.
next_q_values: [batch_size, num_of_documents] tensor, the q values of the
documents in the next step.
next_states: [batch_size, 1 + num_of_documents] tensor, the features for the
user and the docuemnts in the next step.
terminals: [batch_size] tensor, indicating if this is a terminal step.
Returns:
[batch_size] tensor, the target q values.
"""
scores, score_no_click = _get_unnormalized_scores(next_states)
# Obtain all possible slates given current docs in the candidate set.
slate_size = next_actions.get_shape().as_list()[1]
num_candidates = next_q_values.get_shape().as_list()[1]
mesh_args = [list(range(num_candidates))] * slate_size
slates = tf.stack(tf.meshgrid(*mesh_args), axis=-1)
slates = tf.reshape(slates, shape=(-1, slate_size))
# Filter slates that include duplicates to ensure each document is picked
# at most once.
unique_mask = tf.map_fn(
lambda x: tf.equal(tf.size(input=x), tf.size(input=tf.unique(x)[0])),
slates,
dtype=tf.bool)
# [num_of_slates, slate_size]
slates = tf.boolean_mask(tensor=slates, mask=unique_mask)
# [batch_size, num_of_slates, slate_size]
next_q_values_slate = tf.gather(next_q_values, slates, axis=1)
# [batch_size, num_of_slates, slate_size]
scores_slate = tf.gather(scores, slates, axis=1)
# [batch_size, num_of_slates]
batch_size = next_states.get_shape().as_list()[0]
score_no_click_slate = tf.reshape(
tf.tile(score_no_click,
tf.shape(input=slates)[:1]), [batch_size, -1])
# [batch_size, num_of_slates]
next_q_target_slate = tf.reduce_sum(
input_tensor=next_q_values_slate * scores_slate,
axis=2) / (tf.reduce_sum(input_tensor=scores_slate, axis=2) +
score_no_click_slate)
next_q_target_max = tf.reduce_max(input_tensor=next_q_target_slate, axis=1)
return reward + gamma * next_q_target_max * (
1. - tf.cast(terminals, tf.float32))
def loss_fn():
"""Loss function."""
num_classes = logits.get_shape().as_list()[-1]
if num_classes is None:
raise ValueError('Number of classes is unknown.')
masked_logits = tf.boolean_mask(logits, background_mask)
masked_weights = tf.pow(
1.0 - tf.reshape(tf.nn.softmax(masked_logits)[:, 0], [-1, 1]),
gamma)
num_points = tf.shape(masked_logits)[0]
masked_weights = masked_weights * tf.cast(
num_points, dtype=tf.float32) / tf.reduce_sum(masked_weights)
masked_labels_one_hot = tf.one_hot(indices=tf.boolean_mask(
labels, background_mask),
depth=num_classes)
loss = classification_loss_fn(logits=masked_logits,
labels=masked_labels_one_hot,
weights=masked_weights)
return loss
def _body_fn(i, indices_range, indices):
"""Computes the indices of the i-th point feature in each segment."""
indices_i = tf.math.unsorted_segment_max(
data=indices_range, segment_ids=segment_ids, num_segments=num_segments)
indices_i_positive_mask = tf.greater(indices_i, 0)
indices_i_positive = tf.boolean_mask(indices_i, indices_i_positive_mask)
boolean_mask = tf.scatter_nd(
indices=tf.cast(
tf.expand_dims(indices_i_positive - 1, axis=1), dtype=tf.int64),
updates=tf.ones_like(indices_i_positive, dtype=tf.int32),
shape=(n,))
indices_range *= (1 - boolean_mask)
indices_i *= tf.cast(indices_i_positive_mask, dtype=tf.int32)
indices_i = tf.pad(
tf.expand_dims(indices_i, axis=1),
paddings=[[0, 0], [i, num_samples_per_voxel - i - 1]])
indices += indices_i
i = i + 1
return i, indices_range, indices
def select_slate_optimal(slate_size, s_no_click, s, q):
"""Selects the slate using exhaustive search.
This algorithm corresponds to the method "OS" in
Ie et al. https://arxiv.org/abs/1905.12767.
Args:
slate_size: int, the size of the recommendation slate.
s_no_click: float tensor, the score for not clicking any document.
s: [num_of_documents] tensor, the scores for clicking documents.
q: [num_of_documents] tensor, the predicted q values for documents.
Returns:
[slate_size] tensor, the selected slate.
"""
num_candidates = s.shape.as_list()[0]
# Obtain all possible slates given current docs in the candidate set.
mesh_args = [list(range(num_candidates))] * slate_size
slates = tf.stack(tf.meshgrid(*mesh_args), axis=-1)
slates = tf.reshape(slates, shape=(-1, slate_size))
# Filter slates that include duplicates to ensure each document is picked
# at most once.
unique_mask = tf.map_fn(
lambda x: tf.equal(tf.size(input=x), tf.size(input=tf.unique(x)[0])),
slates,
dtype=tf.bool)
slates = tf.boolean_mask(tensor=slates, mask=unique_mask)
slate_q_values = tf.gather(s * q, slates)
slate_scores = tf.gather(s, slates)
slate_normalizer = tf.reduce_sum(input_tensor=slate_scores,
axis=1) + s_no_click
slate_q_values = slate_q_values / tf.expand_dims(slate_normalizer, 1)
slate_sum_q_values = tf.reduce_sum(input_tensor=slate_q_values, axis=1)
max_q_slate_index = tf.argmax(input=slate_sum_q_values)
return tf.gather(slates, max_q_slate_index, axis=0)
def _box_classification_loss_unbatched(inputs_1, outputs_1, is_intermediate,
is_balanced, mine_hard_negatives,
hard_negative_score_threshold):
"""Loss function for input and outputs of batch size 1."""
valid_mask = _get_voxels_valid_mask(inputs_1=inputs_1)
if is_intermediate:
logits = outputs_1[standard_fields.DetectionResultFields.
intermediate_object_semantic_voxels]
else:
logits = outputs_1[
standard_fields.DetectionResultFields.object_semantic_voxels]
num_classes = logits.get_shape().as_list()[-1]
if num_classes is None:
raise ValueError('Number of classes is unknown.')
logits = tf.boolean_mask(tf.reshape(logits, [-1, num_classes]), valid_mask)
labels = tf.boolean_mask(
tf.reshape(
inputs_1[standard_fields.InputDataFields.object_class_voxels],
[-1, 1]), valid_mask)
if mine_hard_negatives or is_balanced:
instances = tf.boolean_mask(
tf.reshape(
inputs_1[
standard_fields.InputDataFields.object_instance_id_voxels],
[-1]), valid_mask)
params = {}
if mine_hard_negatives:
negative_scores = tf.reshape(tf.nn.softmax(logits)[:, 0], [-1])
hard_negative_mask = tf.logical_and(
tf.less(negative_scores, hard_negative_score_threshold),
tf.equal(tf.reshape(labels, [-1]), 0))
hard_negative_labels = tf.boolean_mask(labels, hard_negative_mask)
hard_negative_logits = tf.boolean_mask(logits, hard_negative_mask)
hard_negative_instances = tf.boolean_mask(
tf.ones_like(instances) * (tf.reduce_max(instances) + 1),
hard_negative_mask)
logits = tf.concat([logits, hard_negative_logits], axis=0)
instances = tf.concat([instances, hard_negative_instances], axis=0)
labels = tf.concat([labels, hard_negative_labels], axis=0)
if is_balanced:
weights = loss_utils.get_balanced_loss_weights_multiclass(
labels=tf.expand_dims(instances, axis=1))
params['weights'] = weights
return classification_loss_fn(logits=logits, labels=labels, **params)
def prepare_kitti_dataset(inputs, valid_object_classes=None):
"""Maps the fields from loaded input to standard fields.
Args:
inputs: A dictionary of input tensors.
valid_object_classes: List of valid object classes. if None, it is ignored.
Returns:
A dictionary of input tensors with standard field names.
"""
prepared_inputs = {}
prepared_inputs[standard_fields.InputDataFields.point_positions] = inputs[
standard_fields.InputDataFields.point_positions]
prepared_inputs[standard_fields.InputDataFields.point_intensities] = inputs[
standard_fields.InputDataFields.point_intensities]
prepared_inputs[standard_fields.InputDataFields
.camera_intrinsics] = inputs['cameras/cam02/intrinsics/K']
prepared_inputs[standard_fields.InputDataFields.
camera_rotation_matrix] = inputs['cameras/cam02/extrinsics/R']
prepared_inputs[standard_fields.InputDataFields
.camera_translation] = inputs['cameras/cam02/extrinsics/t']
prepared_inputs[standard_fields.InputDataFields
.camera_image] = inputs['cameras/cam02/image']
prepared_inputs[standard_fields.InputDataFields
.camera_raw_image] = inputs['cameras/cam02/image']
prepared_inputs[standard_fields.InputDataFields
.camera_original_image] = inputs['cameras/cam02/image']
if 'scene_name' in inputs and 'frame_name' in inputs:
prepared_inputs[
standard_fields.InputDataFields.camera_image_name] = tf.strings.join(
[inputs['scene_name'], inputs['frame_name']], separator='_')
if 'objects/pose/R' in inputs:
prepared_inputs[standard_fields.InputDataFields
.objects_rotation_matrix] = inputs['objects/pose/R']
if 'objects/pose/t' in inputs:
prepared_inputs[standard_fields.InputDataFields
.objects_center] = inputs['objects/pose/t']
if 'objects/shape/dimension' in inputs:
prepared_inputs[
standard_fields.InputDataFields.objects_length] = tf.reshape(
inputs['objects/shape/dimension'][:, 0], [-1, 1])
prepared_inputs[standard_fields.InputDataFields.objects_width] = tf.reshape(
inputs['objects/shape/dimension'][:, 1], [-1, 1])
prepared_inputs[
standard_fields.InputDataFields.objects_height] = tf.reshape(
inputs['objects/shape/dimension'][:, 2], [-1, 1])
if 'objects/category/label' in inputs:
prepared_inputs[standard_fields.InputDataFields.objects_class] = tf.reshape(
inputs['objects/category/label'], [-1, 1])
if valid_object_classes is not None:
valid_objects_mask = tf.cast(
tf.zeros_like(
prepared_inputs[standard_fields.InputDataFields.objects_class],
dtype=tf.int32),
dtype=tf.bool)
for object_class in valid_object_classes:
valid_objects_mask = tf.logical_or(
valid_objects_mask,
tf.equal(
prepared_inputs[standard_fields.InputDataFields.objects_class],
object_class))
valid_objects_mask = tf.reshape(valid_objects_mask, [-1])
for key in standard_fields.get_input_object_fields():
if key in prepared_inputs:
prepared_inputs[key] = tf.boolean_mask(prepared_inputs[key],
valid_objects_mask)
return prepared_inputs
def mask_tensor(x, s):
not_x = tf.boolean_mask(x, tf.logical_not(s))
x = tf.boolean_mask(x, s)
return x, not_x
def prepare_waymo_open_dataset(inputs,
valid_object_classes=None,
max_object_distance_from_source=74.88):
"""Maps the fields from loaded input to standard fields.
Args:
inputs: A dictionary of input tensors.
valid_object_classes: List of valid object classes. if None, it is ignored.
max_object_distance_from_source: Maximum distance of objects from source. It
will be ignored if None.
Returns:
A dictionary of input tensors with standard field names.
"""
prepared_inputs = {}
if standard_fields.InputDataFields.point_positions in inputs:
prepared_inputs[standard_fields.InputDataFields.point_positions] = inputs[
standard_fields.InputDataFields.point_positions]
if standard_fields.InputDataFields.point_intensities in inputs:
prepared_inputs[standard_fields.InputDataFields.point_intensities] = inputs[
standard_fields.InputDataFields.point_intensities]
if standard_fields.InputDataFields.point_elongations in inputs:
prepared_inputs[standard_fields.InputDataFields.point_elongations] = inputs[
standard_fields.InputDataFields.point_elongations]
if standard_fields.InputDataFields.point_normals in inputs:
prepared_inputs[standard_fields.InputDataFields.point_normals] = inputs[
standard_fields.InputDataFields.point_normals]
if 'cameras/front/intrinsics/K' in inputs:
prepared_inputs[standard_fields.InputDataFields
.camera_intrinsics] = inputs['cameras/front/intrinsics/K']
if 'cameras/front/extrinsics/R' in inputs:
prepared_inputs[
standard_fields.InputDataFields
.camera_rotation_matrix] = inputs['cameras/front/extrinsics/R']
if 'cameras/front/extrinsics/t' in inputs:
prepared_inputs[standard_fields.InputDataFields
.camera_translation] = inputs['cameras/front/extrinsics/t']
if 'cameras/front/image' in inputs:
prepared_inputs[standard_fields.InputDataFields
.camera_image] = inputs['cameras/front/image']
prepared_inputs[standard_fields.InputDataFields
.camera_raw_image] = inputs['cameras/front/image']
prepared_inputs[standard_fields.InputDataFields
.camera_original_image] = inputs['cameras/front/image']
if 'scene_name' in inputs and 'frame_name' in inputs:
prepared_inputs[
standard_fields.InputDataFields.camera_image_name] = tf.strings.join(
[inputs['scene_name'], inputs['frame_name']], separator='_')
if 'objects/pose/R' in inputs:
prepared_inputs[standard_fields.InputDataFields
.objects_rotation_matrix] = inputs['objects/pose/R']
if 'objects/pose/t' in inputs:
prepared_inputs[standard_fields.InputDataFields
.objects_center] = inputs['objects/pose/t']
if 'objects/shape/dimension' in inputs:
prepared_inputs[
standard_fields.InputDataFields.objects_length] = tf.reshape(
inputs['objects/shape/dimension'][:, 0], [-1, 1])
prepared_inputs[standard_fields.InputDataFields.objects_width] = tf.reshape(
inputs['objects/shape/dimension'][:, 1], [-1, 1])
prepared_inputs[
standard_fields.InputDataFields.objects_height] = tf.reshape(
inputs['objects/shape/dimension'][:, 2], [-1, 1])
if 'objects/category/label' in inputs:
prepared_inputs[standard_fields.InputDataFields.objects_class] = tf.reshape(
inputs['objects/category/label'], [-1, 1])
if valid_object_classes is not None:
valid_objects_mask = tf.cast(
tf.zeros_like(
prepared_inputs[standard_fields.InputDataFields.objects_class],
dtype=tf.int32),
dtype=tf.bool)
for object_class in valid_object_classes:
valid_objects_mask = tf.logical_or(
valid_objects_mask,
tf.equal(
prepared_inputs[standard_fields.InputDataFields.objects_class],
object_class))
valid_objects_mask = tf.reshape(valid_objects_mask, [-1])
for key in standard_fields.get_input_object_fields():
if key in prepared_inputs:
prepared_inputs[key] = tf.boolean_mask(prepared_inputs[key],
valid_objects_mask)
if max_object_distance_from_source is not None:
if standard_fields.InputDataFields.objects_center in prepared_inputs:
object_distances = tf.norm(
prepared_inputs[standard_fields.InputDataFields.objects_center][:,
0:2],
axis=1)
valid_mask = tf.less(object_distances, max_object_distance_from_source)
for key in standard_fields.get_input_object_fields():
if key in prepared_inputs:
prepared_inputs[key] = tf.boolean_mask(prepared_inputs[key],
valid_mask)
return prepared_inputs
def prepare_scannet_frame_dataset(inputs,
min_pixel_depth=0.3,
max_pixel_depth=6.0,
valid_object_classes=None):
"""Maps the fields from loaded input to standard fields.
Args:
inputs: A dictionary of input tensors.
min_pixel_depth: Pixels with depth values less than this are pruned.
max_pixel_depth: Pixels with depth values more than this are pruned.
valid_object_classes: List of valid object classes. if None, it is ignored.
Returns:
A dictionary of input tensors with standard field names.
"""
prepared_inputs = {}
if 'cameras/rgbd_camera/intrinsics/K' not in inputs:
raise ValueError('Intrinsic matrix is missing.')
if 'cameras/rgbd_camera/extrinsics/R' not in inputs:
raise ValueError('Extrinsic rotation matrix is missing.')
if 'cameras/rgbd_camera/extrinsics/t' not in inputs:
raise ValueError('Extrinsics translation is missing.')
if 'cameras/rgbd_camera/depth_image' not in inputs:
raise ValueError('Depth image is missing.')
if 'cameras/rgbd_camera/color_image' not in inputs:
raise ValueError('Color image is missing.')
if 'frame_name' in inputs:
prepared_inputs[standard_fields.InputDataFields
.camera_image_name] = inputs['frame_name']
camera_intrinsics = inputs['cameras/rgbd_camera/intrinsics/K']
depth_image = inputs['cameras/rgbd_camera/depth_image']
image_height = tf.shape(depth_image)[0]
image_width = tf.shape(depth_image)[1]
x, y = tf.meshgrid(
tf.range(image_width), tf.range(image_height), indexing='xy')
x = tf.reshape(tf.cast(x, dtype=tf.float32) + 0.5, [-1, 1])
y = tf.reshape(tf.cast(y, dtype=tf.float32) + 0.5, [-1, 1])
point_positions = projections.image_frame_to_camera_frame(
image_frame=tf.concat([x, y], axis=1),
camera_intrinsics=camera_intrinsics)
rotate_world_to_camera = inputs['cameras/rgbd_camera/extrinsics/R']
translate_world_to_camera = inputs['cameras/rgbd_camera/extrinsics/t']
point_positions = projections.to_world_frame(
camera_frame_points=point_positions,
rotate_world_to_camera=rotate_world_to_camera,
translate_world_to_camera=translate_world_to_camera)
prepared_inputs[standard_fields.InputDataFields
.point_positions] = point_positions * tf.reshape(
depth_image, [-1, 1])
depth_values = tf.reshape(depth_image, [-1])
valid_depth_mask = tf.logical_and(
tf.greater_equal(depth_values, min_pixel_depth),
tf.less_equal(depth_values, max_pixel_depth))
prepared_inputs[standard_fields.InputDataFields.point_colors] = tf.reshape(
tf.cast(inputs['cameras/rgbd_camera/color_image'], dtype=tf.float32),
[-1, 3])
prepared_inputs[standard_fields.InputDataFields.point_colors] *= (2.0 / 255.0)
prepared_inputs[standard_fields.InputDataFields.point_colors] -= 1.0
prepared_inputs[
standard_fields.InputDataFields.point_positions] = tf.boolean_mask(
prepared_inputs[standard_fields.InputDataFields.point_positions],
valid_depth_mask)
prepared_inputs[
standard_fields.InputDataFields.point_colors] = tf.boolean_mask(
prepared_inputs[standard_fields.InputDataFields.point_colors],
valid_depth_mask)
if 'cameras/rgbd_camera/semantic_image' in inputs:
prepared_inputs[
standard_fields.InputDataFields.object_class_points] = tf.cast(
tf.reshape(inputs['cameras/rgbd_camera/semantic_image'], [-1, 1]),
dtype=tf.int32)
prepared_inputs[
standard_fields.InputDataFields.object_class_points] = tf.boolean_mask(
prepared_inputs[
standard_fields.InputDataFields.object_class_points],
valid_depth_mask)
if 'cameras/rgbd_camera/instance_image' in inputs:
prepared_inputs[
standard_fields.InputDataFields.object_instance_id_points] = tf.cast(
tf.reshape(inputs['cameras/rgbd_camera/instance_image'], [-1]),
dtype=tf.int32)
prepared_inputs[standard_fields.InputDataFields
.object_instance_id_points] = tf.boolean_mask(
prepared_inputs[standard_fields.InputDataFields
.object_instance_id_points],
valid_depth_mask)
if valid_object_classes is not None:
valid_objects_mask = tf.cast(
tf.zeros_like(
prepared_inputs[
standard_fields.InputDataFields.object_class_points],
dtype=tf.int32),
dtype=tf.bool)
for object_class in valid_object_classes:
valid_objects_mask = tf.logical_or(
valid_objects_mask,
tf.equal(
prepared_inputs[
standard_fields.InputDataFields.object_class_points],
object_class))
valid_objects_mask = tf.cast(
valid_objects_mask,
dtype=prepared_inputs[
standard_fields.InputDataFields.object_class_points].dtype)
prepared_inputs[standard_fields.InputDataFields
.object_class_points] *= valid_objects_mask
return prepared_inputs
def classification_loss_using_mask_iou_func(embeddings,
logits,
instance_ids,
class_labels,
num_samples,
valid_mask=None,
max_instance_id=None,
similarity_strategy='dotproduct',
is_balanced=True):
"""Classification loss using mask iou.
Args:
embeddings: A tf.float32 tensor of size [batch_size, n, f].
logits: A tf.float32 tensor of size [batch_size, n, num_classes]. It is
assumed that background is class 0.
instance_ids: A tf.int32 tensor of size [batch_size, n].
class_labels: A tf.int32 tensor of size [batch_size, n]. It is assumed
that the background voxels are assigned to class 0.
num_samples: An int determining the number of samples.
valid_mask: A tf.bool tensor of size [batch_size, n] that is True when an
element is valid and False if it needs to be ignored. By default the value
is None which means it is not applied.
max_instance_id: If set, instance ids larger than that value will be
ignored. If not set, it will be computed from instance_ids tensor.
similarity_strategy: Defines the method for computing similarity between
embedding vectors. Possible values are 'dotproduct' and
'distance'.
is_balanced: If True, the per-voxel losses are re-weighted to have equal
total weight for foreground vs. background voxels.
Returns:
A tf.float32 scalar loss tensor.
"""
batch_size = embeddings.get_shape().as_list()[0]
if batch_size is None:
raise ValueError('Unknown batch size at graph construction time.')
if max_instance_id is None:
max_instance_id = tf.reduce_max(instance_ids)
class_labels = tf.reshape(class_labels, [batch_size, -1, 1])
sampled_embeddings, sampled_instance_ids, sampled_indices = (
sampling_utils.balanced_sample(features=embeddings,
instance_ids=instance_ids,
num_samples=num_samples,
valid_mask=valid_mask,
max_instance_id=max_instance_id))
losses = []
for i in range(batch_size):
embeddings_i = embeddings[i, :, :]
instance_ids_i = instance_ids[i, :]
class_labels_i = class_labels[i, :, :]
logits_i = logits[i, :]
sampled_embeddings_i = sampled_embeddings[i, :, :]
sampled_instance_ids_i = sampled_instance_ids[i, :]
sampled_indices_i = sampled_indices[i, :]
sampled_class_labels_i = tf.gather(class_labels_i, sampled_indices_i)
sampled_logits_i = tf.gather(logits_i, sampled_indices_i)
if valid_mask is not None:
valid_mask_i = valid_mask[i]
embeddings_i = tf.boolean_mask(embeddings_i, valid_mask_i)
instance_ids_i = tf.boolean_mask(instance_ids_i, valid_mask_i)
loss_i = classification_loss_using_mask_iou_func_unbatched(
embeddings=embeddings_i,
instance_ids=instance_ids_i,
sampled_embeddings=sampled_embeddings_i,
sampled_instance_ids=sampled_instance_ids_i,
sampled_class_labels=sampled_class_labels_i,
sampled_logits=sampled_logits_i,
similarity_strategy=similarity_strategy,
is_balanced=is_balanced)
losses.append(loss_i)
return tf.math.reduce_mean(tf.stack(losses))
def update_state(self, inputs, outputs):
"""Function that updates the metric state at each example.
Args:
inputs: A dictionary containing input tensors.
outputs: A dictionary containing output tensors.
Returns:
Update op.
"""
detections_score = tf.reshape(
outputs[standard_fields.DetectionResultFields.objects_score], [-1])
detections_class = tf.reshape(
outputs[standard_fields.DetectionResultFields.objects_class], [-1])
detections_length = tf.reshape(
outputs[standard_fields.DetectionResultFields.objects_length],
[-1])
detections_height = tf.reshape(
outputs[standard_fields.DetectionResultFields.objects_height],
[-1])
detections_width = tf.reshape(
outputs[standard_fields.DetectionResultFields.objects_width], [-1])
detections_center = tf.reshape(
outputs[standard_fields.DetectionResultFields.objects_center],
[-1, 3])
detections_rotation_matrix = tf.reshape(
outputs[
standard_fields.DetectionResultFields.objects_rotation_matrix],
[-1, 3, 3])
gt_class = tf.reshape(
inputs[standard_fields.InputDataFields.objects_class], [-1])
gt_length = tf.reshape(
inputs[standard_fields.InputDataFields.objects_length], [-1])
gt_height = tf.reshape(
inputs[standard_fields.InputDataFields.objects_height], [-1])
gt_width = tf.reshape(
inputs[standard_fields.InputDataFields.objects_width], [-1])
gt_center = tf.reshape(
inputs[standard_fields.InputDataFields.objects_center], [-1, 3])
gt_rotation_matrix = tf.reshape(
inputs[standard_fields.InputDataFields.objects_rotation_matrix],
[-1, 3, 3])
for c in self.class_range:
gt_mask_c = tf.equal(gt_class, c)
num_gt_c = tf.math.reduce_sum(tf.cast(gt_mask_c, dtype=tf.int32))
gt_length_c = tf.boolean_mask(gt_length, gt_mask_c)
gt_height_c = tf.boolean_mask(gt_height, gt_mask_c)
gt_width_c = tf.boolean_mask(gt_width, gt_mask_c)
gt_center_c = tf.boolean_mask(gt_center, gt_mask_c)
gt_rotation_matrix_c = tf.boolean_mask(gt_rotation_matrix,
gt_mask_c)
detections_mask_c = tf.equal(detections_class, c)
num_detections_c = tf.math.reduce_sum(
tf.cast(detections_mask_c, dtype=tf.int32))
if num_detections_c == 0:
continue
det_length_c = tf.boolean_mask(detections_length,
detections_mask_c)
det_height_c = tf.boolean_mask(detections_height,
detections_mask_c)
det_width_c = tf.boolean_mask(detections_width, detections_mask_c)
det_center_c = tf.boolean_mask(detections_center,
detections_mask_c)
det_rotation_matrix_c = tf.boolean_mask(detections_rotation_matrix,
detections_mask_c)
det_scores_c = tf.boolean_mask(detections_score, detections_mask_c)
det_scores_c, sorted_indices = tf.math.top_k(det_scores_c,
k=num_detections_c)
det_length_c = tf.gather(det_length_c, sorted_indices)
det_height_c = tf.gather(det_height_c, sorted_indices)
det_width_c = tf.gather(det_width_c, sorted_indices)
det_center_c = tf.gather(det_center_c, sorted_indices)
det_rotation_matrix_c = tf.gather(det_rotation_matrix_c,
sorted_indices)
tp_c = tf.zeros([num_detections_c], dtype=tf.int32)
if num_gt_c > 0:
ious_c = box_ops.iou3d(
boxes1_length=gt_length_c,
boxes1_height=gt_height_c,
boxes1_width=gt_width_c,
boxes1_center=gt_center_c,
boxes1_rotation_matrix=gt_rotation_matrix_c,
boxes2_length=det_length_c,
boxes2_height=det_height_c,
boxes2_width=det_width_c,
boxes2_center=det_center_c,
boxes2_rotation_matrix=det_rotation_matrix_c)
max_overlap_gt_ids = tf.cast(tf.math.argmax(ious_c, axis=0),
dtype=tf.int32)
is_gt_box_detected = tf.zeros([num_gt_c], dtype=tf.int32)
for i in tf.range(num_detections_c):
gt_id = max_overlap_gt_ids[i]
if (ious_c[gt_id, i] > self.iou_threshold
and is_gt_box_detected[gt_id] == 0):
tp_c = tf.maximum(
tf.one_hot(i, num_detections_c, dtype=tf.int32),
tp_c)
is_gt_box_detected = tf.maximum(
tf.one_hot(gt_id, num_gt_c, dtype=tf.int32),
is_gt_box_detected)
self.tp[c] = tf.concat([self.tp[c], tp_c], axis=0)
self.scores[c] = tf.concat([self.scores[c], det_scores_c], axis=0)
self.num_gt[c] += num_gt_c
return tf.no_op()
def _non_nan_mean(tensor_list): """Calculates the mean of a list of tensors while ignoring nans.""" tensor = tf.stack(tensor_list) not_nan = tf.logical_not(tf.math.is_nan(tensor)) return tf.reduce_mean(tf.boolean_mask(tensor, not_nan))
def train_eval(
load_root_dir,
env_load_fn=None,
gym_env_wrappers=[],
monitor=False,
env_name=None,
agent_class=None,
train_metrics_callback=None,
# SacAgent args
actor_fc_layers=(256, 256),
critic_joint_fc_layers=(256, 256),
# Safety Critic training args
safety_critic_joint_fc_layers=None,
safety_critic_lr=3e-4,
safety_critic_bias_init_val=None,
safety_critic_kernel_scale=None,
n_envs=None,
target_safety=0.2,
fail_weight=None,
# Params for train
num_global_steps=10000,
batch_size=256,
# Params for eval
run_eval=False,
eval_metrics=[],
num_eval_episodes=10,
eval_interval=1000,
# Params for summaries and logging
train_checkpoint_interval=10000,
summary_interval=1000,
monitor_interval=5000,
summaries_flush_secs=10,
debug_summaries=False,
seed=None):
if isinstance(agent_class, str):
assert agent_class in ALGOS, 'trainer.train_eval: agent_class {} invalid'.format(
agent_class)
agent_class = ALGOS.get(agent_class)
train_ckpt_dir = osp.join(load_root_dir, 'train')
rb_ckpt_dir = osp.join(load_root_dir, 'train', 'replay_buffer')
py_env = env_load_fn(env_name, gym_env_wrappers=gym_env_wrappers)
tf_env = tf_py_environment.TFPyEnvironment(py_env)
if monitor:
vid_path = os.path.join(load_root_dir, 'rollouts')
monitor_env_wrapper = misc.monitor_freq(1, vid_path)
monitor_env = gym.make(env_name)
for wrapper in gym_env_wrappers:
monitor_env = wrapper(monitor_env)
monitor_env = monitor_env_wrapper(monitor_env)
# auto_reset must be False to ensure Monitor works correctly
monitor_py_env = gym_wrapper.GymWrapper(monitor_env, auto_reset=False)
if run_eval:
eval_dir = os.path.join(load_root_dir, 'eval')
n_envs = n_envs or num_eval_episodes
eval_summary_writer = tf.compat.v2.summary.create_file_writer(
eval_dir, flush_millis=summaries_flush_secs * 1000)
eval_metrics = [
tf_metrics.AverageReturnMetric(prefix='EvalMetrics',
buffer_size=num_eval_episodes,
batch_size=n_envs),
tf_metrics.AverageEpisodeLengthMetric(
prefix='EvalMetrics',
buffer_size=num_eval_episodes,
batch_size=n_envs)
] + [
tf_py_metric.TFPyMetric(m, name='EvalMetrics/{}'.format(m.name))
for m in eval_metrics
]
eval_tf_env = tf_py_environment.TFPyEnvironment(
parallel_py_environment.ParallelPyEnvironment([
lambda: env_load_fn(env_name,
gym_env_wrappers=gym_env_wrappers)
] * n_envs))
if seed:
seeds = [seed * n_envs + i for i in range(n_envs)]
try:
eval_tf_env.pyenv.seed(seeds)
except:
pass
global_step = tf.compat.v1.train.get_or_create_global_step()
time_step_spec = tf_env.time_step_spec()
observation_spec = time_step_spec.observation
action_spec = tf_env.action_spec()
actor_net = actor_distribution_network.ActorDistributionNetwork(
observation_spec,
action_spec,
fc_layer_params=actor_fc_layers,
continuous_projection_net=agents.normal_projection_net)
critic_net = agents.CriticNetwork(
(observation_spec, action_spec),
joint_fc_layer_params=critic_joint_fc_layers)
if agent_class in SAFETY_AGENTS:
safety_critic_net = agents.CriticNetwork(
(observation_spec, action_spec),
joint_fc_layer_params=critic_joint_fc_layers)
tf_agent = agent_class(time_step_spec,
action_spec,
actor_network=actor_net,
critic_network=critic_net,
safety_critic_network=safety_critic_net,
train_step_counter=global_step,
debug_summaries=False)
else:
tf_agent = agent_class(time_step_spec,
action_spec,
actor_network=actor_net,
critic_network=critic_net,
train_step_counter=global_step,
debug_summaries=False)
collect_data_spec = tf_agent.collect_data_spec
replay_buffer = tf_uniform_replay_buffer.TFUniformReplayBuffer(
collect_data_spec, batch_size=1, max_length=1000000)
replay_buffer = misc.load_rb_ckpt(rb_ckpt_dir, replay_buffer)
tf_agent, _ = misc.load_agent_ckpt(train_ckpt_dir, tf_agent)
if agent_class in SAFETY_AGENTS:
target_safety = target_safety or tf_agent._target_safety
loaded_train_steps = global_step.numpy()
logging.info("Loaded agent from %s trained for %d steps", train_ckpt_dir,
loaded_train_steps)
global_step.assign(0)
tf.summary.experimental.set_step(global_step)
thresholds = [target_safety, 0.5]
sc_metrics = [
tf.keras.metrics.AUC(name='safety_critic_auc'),
tf.keras.metrics.BinaryAccuracy(name='safety_critic_acc',
threshold=0.5),
tf.keras.metrics.TruePositives(name='safety_critic_tp',
thresholds=thresholds),
tf.keras.metrics.FalsePositives(name='safety_critic_fp',
thresholds=thresholds),
tf.keras.metrics.TrueNegatives(name='safety_critic_tn',
thresholds=thresholds),
tf.keras.metrics.FalseNegatives(name='safety_critic_fn',
thresholds=thresholds)
]
if seed:
tf.compat.v1.set_random_seed(seed)
summaries_flush_secs = 10
timestamp = datetime.utcnow().strftime('%Y-%m-%d-%H-%M-%S')
offline_train_dir = osp.join(train_ckpt_dir, 'offline', timestamp)
config_saver = gin.tf.GinConfigSaverHook(offline_train_dir,
summarize_config=True)
tf.function(config_saver.after_create_session)()
sc_summary_writer = tf.compat.v2.summary.create_file_writer(
offline_train_dir, flush_millis=summaries_flush_secs * 1000)
sc_summary_writer.set_as_default()
if safety_critic_kernel_scale is not None:
ki = tf.compat.v1.variance_scaling_initializer(
scale=safety_critic_kernel_scale,
mode='fan_in',
distribution='truncated_normal')
else:
ki = tf.compat.v1.keras.initializers.VarianceScaling(
scale=1. / 3., mode='fan_in', distribution='uniform')
if safety_critic_bias_init_val is not None:
bi = tf.constant_initializer(safety_critic_bias_init_val)
else:
bi = None
sc_net_off = agents.CriticNetwork(
(observation_spec, action_spec),
joint_fc_layer_params=safety_critic_joint_fc_layers,
kernel_initializer=ki,
value_bias_initializer=bi,
name='SafetyCriticOffline')
sc_net_off.create_variables()
target_sc_net_off = common.maybe_copy_target_network_with_checks(
sc_net_off, None, 'TargetSafetyCriticNetwork')
optimizer = tf.keras.optimizers.Adam(safety_critic_lr)
sc_net_off_ckpt_dir = os.path.join(offline_train_dir, 'safety_critic')
sc_checkpointer = common.Checkpointer(
ckpt_dir=sc_net_off_ckpt_dir,
safety_critic=sc_net_off,
target_safety_critic=target_sc_net_off,
optimizer=optimizer,
global_step=global_step,
max_to_keep=5)
sc_checkpointer.initialize_or_restore()
resample_counter = py_metrics.CounterMetric('ActionResampleCounter')
eval_policy = agents.SafeActorPolicyRSVar(
time_step_spec=time_step_spec,
action_spec=action_spec,
actor_network=actor_net,
safety_critic_network=sc_net_off,
safety_threshold=target_safety,
resample_counter=resample_counter,
training=True)
dataset = replay_buffer.as_dataset(num_parallel_calls=3,
num_steps=2,
sample_batch_size=batch_size //
2).prefetch(3)
data = iter(dataset)
full_data = replay_buffer.gather_all()
fail_mask = tf.cast(full_data.observation['task_agn_rew'], tf.bool)
fail_step = nest_utils.fast_map_structure(
lambda *x: tf.boolean_mask(*x, fail_mask), full_data)
init_step = nest_utils.fast_map_structure(
lambda *x: tf.boolean_mask(*x, full_data.is_first()), full_data)
before_fail_mask = tf.roll(fail_mask, [-1], axis=[1])
after_init_mask = tf.roll(full_data.is_first(), [1], axis=[1])
before_fail_step = nest_utils.fast_map_structure(
lambda *x: tf.boolean_mask(*x, before_fail_mask), full_data)
after_init_step = nest_utils.fast_map_structure(
lambda *x: tf.boolean_mask(*x, after_init_mask), full_data)
filter_mask = tf.squeeze(tf.logical_or(before_fail_mask, fail_mask))
filter_mask = tf.pad(
filter_mask, [[0, replay_buffer._max_length - filter_mask.shape[0]]])
n_failures = tf.reduce_sum(tf.cast(filter_mask, tf.int32)).numpy()
failure_buffer = tf_uniform_replay_buffer.TFUniformReplayBuffer(
collect_data_spec,
batch_size=1,
max_length=n_failures,
dataset_window_shift=1)
data_utils.copy_rb(replay_buffer, failure_buffer, filter_mask)
sc_dataset_neg = failure_buffer.as_dataset(num_parallel_calls=3,
sample_batch_size=batch_size //
2,
num_steps=2).prefetch(3)
neg_data = iter(sc_dataset_neg)
get_action = lambda ts: tf_agent._actions_and_log_probs(ts)[0]
eval_sc = log_utils.eval_fn(before_fail_step, fail_step, init_step,
after_init_step, get_action)
losses = []
mean_loss = tf.keras.metrics.Mean(name='mean_ep_loss')
target_update = train_utils.get_target_updater(sc_net_off,
target_sc_net_off)
with tf.summary.record_if(
lambda: tf.math.equal(global_step % summary_interval, 0)):
while global_step.numpy() < num_global_steps:
pos_experience, _ = next(data)
neg_experience, _ = next(neg_data)
exp = data_utils.concat_batches(pos_experience, neg_experience,
collect_data_spec)
boundary_mask = tf.logical_not(exp.is_boundary()[:, 0])
exp = nest_utils.fast_map_structure(
lambda *x: tf.boolean_mask(*x, boundary_mask), exp)
safe_rew = exp.observation['task_agn_rew'][:, 1]
if fail_weight:
weights = tf.where(tf.cast(safe_rew, tf.bool),
fail_weight / 0.5, (1 - fail_weight) / 0.5)
else:
weights = None
train_loss, sc_loss, lam_loss = train_step(
exp,
safe_rew,
tf_agent,
sc_net=sc_net_off,
target_sc_net=target_sc_net_off,
metrics=sc_metrics,
weights=weights,
target_safety=target_safety,
optimizer=optimizer,
target_update=target_update,
debug_summaries=debug_summaries)
global_step.assign_add(1)
global_step_val = global_step.numpy()
losses.append(
(train_loss.numpy(), sc_loss.numpy(), lam_loss.numpy()))
mean_loss(train_loss)
with tf.name_scope('Losses'):
tf.compat.v2.summary.scalar(name='sc_loss',
data=sc_loss,
step=global_step_val)
tf.compat.v2.summary.scalar(name='lam_loss',
data=lam_loss,
step=global_step_val)
if global_step_val % summary_interval == 0:
tf.compat.v2.summary.scalar(name=mean_loss.name,
data=mean_loss.result(),
step=global_step_val)
if global_step_val % summary_interval == 0:
with tf.name_scope('Metrics'):
for metric in sc_metrics:
if len(tf.squeeze(metric.result()).shape) == 0:
tf.compat.v2.summary.scalar(name=metric.name,
data=metric.result(),
step=global_step_val)
else:
fmt_str = '_{}'.format(thresholds[0])
tf.compat.v2.summary.scalar(
name=metric.name + fmt_str,
data=metric.result()[0],
step=global_step_val)
fmt_str = '_{}'.format(thresholds[1])
tf.compat.v2.summary.scalar(
name=metric.name + fmt_str,
data=metric.result()[1],
step=global_step_val)
metric.reset_states()
if global_step_val % eval_interval == 0:
eval_sc(sc_net_off, step=global_step_val)
if run_eval:
results = metric_utils.eager_compute(
eval_metrics,
eval_tf_env,
eval_policy,
num_episodes=num_eval_episodes,
train_step=global_step,
summary_writer=eval_summary_writer,
summary_prefix='EvalMetrics',
)
if train_metrics_callback is not None:
train_metrics_callback(results, global_step_val)
metric_utils.log_metrics(eval_metrics)
with eval_summary_writer.as_default():
for eval_metric in eval_metrics[2:]:
eval_metric.tf_summaries(
train_step=global_step,
step_metrics=eval_metrics[:2])
if monitor and global_step_val % monitor_interval == 0:
monitor_time_step = monitor_py_env.reset()
monitor_policy_state = eval_policy.get_initial_state(1)
ep_len = 0
monitor_start = time.time()
while not monitor_time_step.is_last():
monitor_action = eval_policy.action(
monitor_time_step, monitor_policy_state)
action, monitor_policy_state = monitor_action.action, monitor_action.state
monitor_time_step = monitor_py_env.step(action)
ep_len += 1
logging.debug(
'saved rollout at timestep %d, rollout length: %d, %4.2f sec',
global_step_val, ep_len,
time.time() - monitor_start)
if global_step_val % train_checkpoint_interval == 0:
sc_checkpointer.save(global_step=global_step_val)