def build_objectmotion_test_graph(self):
"""Builds egomotion model reading from placeholders."""
input_image_stack_om = tf.placeholder(
tf.float32,
[1, self.img_height, self.img_width, self.seq_length * 3],
name='raw_input')
if self.imagenet_norm:
im_mean = tf.tile(
tf.constant(reader.IMAGENET_MEAN), multiples=[self.seq_length])
im_sd = tf.tile(
tf.constant(reader.IMAGENET_SD), multiples=[self.seq_length])
input_image_stack_om = (input_image_stack_om - im_mean) / im_sd
with tf.variable_scope('objectmotion_prediction'):
est_objectmotion = nets.objectmotion_net(
image_stack=input_image_stack_om,
disp_bottleneck_stack=None,
joint_encoder=self.joint_encoder,
seq_length=self.seq_length,
weight_reg=self.weight_reg)
self.input_image_stack_om = input_image_stack_om
self.est_objectmotion = est_objectmotion
def build_objectmotion_test_graph(self):
"""Builds egomotion model reading from placeholders."""
input_image_stack_om = tf.placeholder(
tf.float32,
[1, self.img_height, self.img_width, self.seq_length * 3],
name='raw_input')
if self.imagenet_norm:
im_mean = tf.tile(
tf.constant(reader.IMAGENET_MEAN), multiples=[self.seq_length])
im_sd = tf.tile(
tf.constant(reader.IMAGENET_SD), multiples=[self.seq_length])
input_image_stack_om = (input_image_stack_om - im_mean) / im_sd
with tf.variable_scope('objectmotion_prediction'):
est_objectmotion = nets.objectmotion_net(
image_stack=input_image_stack_om,
disp_bottleneck_stack=None,
joint_encoder=self.joint_encoder,
seq_length=self.seq_length,
weight_reg=self.weight_reg)
self.input_image_stack_om = input_image_stack_om
self.est_objectmotion = est_objectmotion
def build_inference_for_training(self):
"""Invokes depth and ego-motion networks and computes clouds if needed."""
(self.image_stack, self.image_stack_norm, self.seg_stack,
self.intrinsic_mat, self.intrinsic_mat_inv) = self.reader.read_data()
with tf.variable_scope('depth_prediction'):
# Organized by ...[i][scale]. Note that the order is flipped in
# variables in build_loss() below.
self.disp = {}
self.depth = {}
self.depth_upsampled = {}
self.inf_loss = 0.0
# Organized by [i].
disp_bottlenecks = [None] * self.seq_length
if self.icp_weight > 0:
self.cloud = {}
for i in range(self.seq_length):
image = self.image_stack_norm[:, :, :, 3 * i:3 * (i + 1)]
multiscale_disps_i, disp_bottlenecks[i] = nets.disp_net(
self.architecture, image, self.use_skip,
self.weight_reg, True)
multiscale_depths_i = [1.0 / d for d in multiscale_disps_i]
self.disp[i] = multiscale_disps_i
self.depth[i] = multiscale_depths_i
if self.depth_upsampling:
self.depth_upsampled[i] = []
# Upsample low-resolution depth maps using differentiable bilinear
# interpolation.
for s in range(len(multiscale_depths_i)):
self.depth_upsampled[i].append(tf.image.resize_bilinear(
multiscale_depths_i[s], [self.img_height, self.img_width],
align_corners=True))
if self.icp_weight > 0:
multiscale_clouds_i = [
project.get_cloud(d,
self.intrinsic_mat_inv[:, s, :, :],
name='cloud%d_%d' % (s, i))
for (s, d) in enumerate(multiscale_depths_i)
]
self.cloud[i] = multiscale_clouds_i
# Reuse the same depth graph for all images.
tf.get_variable_scope().reuse_variables()
if self.handle_motion:
# Define egomotion network. This network can see the whole scene except
# for any moving objects as indicated by the provided segmentation masks.
# To avoid the network getting clues of motion by tracking those masks, we
# define the segmentation masks as the union temporally.
print('')
print('')
print('')
print('HANDLE MOTION')
print('')
print('')
print('')
with tf.variable_scope('egomotion_prediction'):
base_input = self.image_stack_norm # (B, H, W, 9)
seg_input = self.seg_stack # (B, H, W, 9)
ref_zero = tf.constant(0, dtype=tf.uint8)
# Motion model is currently defined for three-frame sequences.
object_mask1 = tf.equal(seg_input[:, :, :, 0], ref_zero)
object_mask2 = tf.equal(seg_input[:, :, :, 3], ref_zero)
object_mask3 = tf.equal(seg_input[:, :, :, 6], ref_zero)
mask_complete = tf.expand_dims(tf.logical_and( # (B, H, W, 1)
tf.logical_and(object_mask1, object_mask2), object_mask3), axis=3)
mask_complete = tf.tile(mask_complete, (1, 1, 1, 9)) # (B, H, W, 9)
# Now mask out base_input.
self.mask_complete = tf.to_float(mask_complete)
self.base_input_masked = base_input * self.mask_complete
self.egomotion = nets.egomotion_net(
image_stack=self.base_input_masked,
disp_bottleneck_stack=None,
joint_encoder=False,
seq_length=self.seq_length,
weight_reg=self.weight_reg)
sess = tf.Session()
with sess.as_default():
check_ego = sess.run(egomotion)
print('')
print('')
print('egomotion = ', egomotion)
print('')
print('')
# print('')
# print('')
# print('egomotion = ', egomotion)
# print('')
# print('')
# Define object motion network for refinement. This network only sees
# one object at a time over the whole sequence, and tries to estimate its
# motion. The sequence of images are the respective warped frames.
# For each scale, contains batch_size elements of shape (N, 2, 6).
self.object_transforms = {}
# For each scale, contains batch_size elements of shape (N, H, W, 9).
self.object_masks = {}
self.object_masks_warped = {}
# For each scale, contains batch_size elements of size N.
self.object_ids = {}
self.egomotions_seq = {}
self.warped_seq = {}
self.inputs_objectmotion_net = {}
with tf.variable_scope('objectmotion_prediction'):
# First, warp raw images according to overall egomotion.
for s in range(NUM_SCALES):
self.warped_seq[s] = []
self.egomotions_seq[s] = []
for source_index in range(self.seq_length):
egomotion_mat_i_1 = project.get_transform_mat(
self.egomotion, source_index, 1)
warped_image_i_1, _ = (
project.inverse_warp(
self.image_stack[
:, :, :, source_index*3:(source_index+1)*3],
self.depth_upsampled[1][s],
egomotion_mat_i_1,
self.intrinsic_mat[:, 0, :, :],
self.intrinsic_mat_inv[:, 0, :, :]))
self.warped_seq[s].append(warped_image_i_1)
self.egomotions_seq[s].append(egomotion_mat_i_1)
# Second, for every object in the segmentation mask, take its mask and
# warp it according to the egomotion estimate. Then put a threshold to
# binarize the warped result. Use this mask to mask out background and
# other objects, and pass the filtered image to the object motion
# network.
self.object_transforms[s] = []
self.object_masks[s] = []
self.object_ids[s] = []
self.object_masks_warped[s] = []
self.inputs_objectmotion_net[s] = {}
for i in range(self.batch_size):
seg_sequence = self.seg_stack[i] # (H, W, 9=3*3)
object_ids = tf.unique(tf.reshape(seg_sequence, [-1]))[0]
self.object_ids[s].append(object_ids)
color_stack = []
mask_stack = []
mask_stack_warped = []
for j in range(self.seq_length):
current_image = self.warped_seq[s][j][i] # (H, W, 3)
current_seg = seg_sequence[:, :, j * 3:(j+1) * 3] # (H, W, 3)
def process_obj_mask_warp(obj_id):
"""Performs warping of the individual object masks."""
obj_mask = tf.to_float(tf.equal(current_seg, obj_id))
# Warp obj_mask according to overall egomotion.
obj_mask_warped, _ = (
project.inverse_warp(
tf.expand_dims(obj_mask, axis=0),
# Middle frame, highest scale, batch element i:
tf.expand_dims(self.depth_upsampled[1][s][i], axis=0),
# Matrix for warping j into middle frame, batch elem. i:
tf.expand_dims(self.egomotions_seq[s][j][i], axis=0),
tf.expand_dims(self.intrinsic_mat[i, 0, :, :], axis=0),
tf.expand_dims(self.intrinsic_mat_inv[i, 0, :, :],
axis=0)))
obj_mask_warped = tf.squeeze(obj_mask_warped)
obj_mask_binarized = tf.greater( # Threshold to binarize mask.
obj_mask_warped, tf.constant(0.5))
return tf.to_float(obj_mask_binarized)
def process_obj_mask(obj_id):
"""Returns the individual object masks separately."""
return tf.to_float(tf.equal(current_seg, obj_id))
object_masks = tf.map_fn( # (N, H, W, 3)
process_obj_mask, object_ids, dtype=tf.float32)
if self.size_constraint_weight > 0:
# The object segmentation masks are all in object_masks.
# We need to measure the height of every of them, and get the
# approximate distance.
# self.depth_upsampled of shape (seq_length, scale, B, H, W).
depth_pred = self.depth_upsampled[j][s][i] # (H, W)
def get_losses(obj_mask):
"""Get motion constraint loss."""
# Find height of segment.
coords = tf.where(tf.greater( # Shape (num_true, 2=yx)
obj_mask[:, :, 0], tf.constant(0.5, dtype=tf.float32)))
y_max = tf.reduce_max(coords[:, 0])
y_min = tf.reduce_min(coords[:, 0])
seg_height = y_max - y_min
f_y = self.intrinsic_mat[i, 0, 1, 1]
approx_depth = ((f_y * self.global_scale_var) /
tf.to_float(seg_height))
reference_pred = tf.boolean_mask(
depth_pred, tf.greater(
tf.reshape(obj_mask[:, :, 0],
(self.img_height, self.img_width, 1)),
tf.constant(0.5, dtype=tf.float32)))
# Establish loss on approx_depth, a scalar, and
# reference_pred, our dense prediction. Normalize both to
# prevent degenerative depth shrinking.
global_mean_depth_pred = tf.reduce_mean(depth_pred)
reference_pred /= global_mean_depth_pred
approx_depth /= global_mean_depth_pred
spatial_err = tf.abs(reference_pred - approx_depth)
print('')
print('')
print('spatial error =', spatial_err)
print('')
print('')
#mean_spatial_err = tf.reduce_mean(tf.concat([spatial_err, tf.zeros(1)], axis = 0))
mean_spatial_err = tf.reduce_mean(spatial_err)
return mean_spatial_err
losses = tf.map_fn(
get_losses, object_masks, dtype=tf.float32)
print('')
print('')
print('Losses = ', losses)
print('')
print('')
self.inf_loss += tf.reduce_mean(losses)
print('')
print('')
print('self.inf_loss = ', self.inf_loss)
print('')
print('')
object_masks_warped = tf.map_fn( # (N, H, W, 3)
process_obj_mask_warp, object_ids, dtype=tf.float32)
filtered_images = tf.map_fn(
lambda mask: current_image * mask, object_masks_warped,
dtype=tf.float32) # (N, H, W, 3)
color_stack.append(filtered_images)
mask_stack.append(object_masks)
mask_stack_warped.append(object_masks_warped)
# For this batch-element, if there are N moving objects,
# color_stack, mask_stack and mask_stack_warped contain both
# seq_length elements of shape (N, H, W, 3).
# We can now concatenate them on the last axis, creating a tensor of
# (N, H, W, 3*3 = 9), and, assuming N does not get too large so that
# we have enough memory, pass them in a single batch to the object
# motion network.
mask_stack = tf.concat(mask_stack, axis=3) # (N, H, W, 9)
mask_stack_warped = tf.concat(mask_stack_warped, axis=3)
color_stack = tf.concat(color_stack, axis=3) # (N, H, W, 9)
all_transforms = nets.objectmotion_net(
# We cut the gradient flow here as the object motion gradient
# should have no saying in how the egomotion network behaves.
# One could try just stopping the gradient for egomotion, but
# not for the depth prediction network.
image_stack=tf.stop_gradient(color_stack),
disp_bottleneck_stack=None,
joint_encoder=False, # Joint encoder not supported.
seq_length=self.seq_length,
weight_reg=self.weight_reg)
# all_transforms of shape (N, 2, 6).
self.object_transforms[s].append(all_transforms)
self.object_masks[s].append(mask_stack)
self.object_masks_warped[s].append(mask_stack_warped)
self.inputs_objectmotion_net[s][i] = color_stack
tf.get_variable_scope().reuse_variables()
print('')
print('')
print('')
print('HANDLE MOTION22222')
print('')
print('')
print('')
else:
# Don't handle motion, classic model formulation.
with tf.name_scope('egomotion_prediction'):
if self.joint_encoder:
# Re-arrange disp_bottleneck_stack to be of shape
# [B, h_hid, w_hid, c_hid * seq_length]. Currently, it is a list with
# seq_length elements, each of dimension [B, h_hid, w_hid, c_hid].
disp_bottleneck_stack = tf.concat(disp_bottlenecks, axis=3)
else:
disp_bottleneck_stack = None
self.egomotion = nets.egomotion_net(
image_stack=self.image_stack_norm,
disp_bottleneck_stack=disp_bottleneck_stack,
joint_encoder=self.joint_encoder,
seq_length=self.seq_length,
weight_reg=self.weight_reg)
def build_inference_for_training(self):
"""Invokes depth and ego-motion networks and computes clouds if needed."""
(self.image_stack, self.image_stack_norm, self.seg_stack,
self.intrinsic_mat, self.intrinsic_mat_inv) = self.reader.read_data()
with tf.variable_scope('depth_prediction'):
# Organized by ...[i][scale]. Note that the order is flipped in
# variables in build_loss() below.
self.disp = {}
self.depth = {}
self.depth_upsampled = {}
self.inf_loss = 0.0
# Organized by [i].
disp_bottlenecks = [None] * self.seq_length
if self.icp_weight > 0:
self.cloud = {}
for i in range(self.seq_length):
image = self.image_stack_norm[:, :, :, 3 * i:3 * (i + 1)]
multiscale_disps_i, disp_bottlenecks[i] = nets.disp_net(
self.architecture, image, self.use_skip,
self.weight_reg, True)
multiscale_depths_i = [1.0 / d for d in multiscale_disps_i]
self.disp[i] = multiscale_disps_i
self.depth[i] = multiscale_depths_i
if self.depth_upsampling:
self.depth_upsampled[i] = []
# Upsample low-resolution depth maps using differentiable bilinear
# interpolation.
for s in range(len(multiscale_depths_i)):
self.depth_upsampled[i].append(tf.image.resize_bilinear(
multiscale_depths_i[s], [self.img_height, self.img_width],
align_corners=True))
if self.icp_weight > 0:
multiscale_clouds_i = [
project.get_cloud(d,
self.intrinsic_mat_inv[:, s, :, :],
name='cloud%d_%d' % (s, i))
for (s, d) in enumerate(multiscale_depths_i)
]
self.cloud[i] = multiscale_clouds_i
# Reuse the same depth graph for all images.
tf.get_variable_scope().reuse_variables()
if self.handle_motion:
# Define egomotion network. This network can see the whole scene except
# for any moving objects as indicated by the provided segmentation masks.
# To avoid the network getting clues of motion by tracking those masks, we
# define the segmentation masks as the union temporally.
with tf.variable_scope('egomotion_prediction'):
base_input = self.image_stack_norm # (B, H, W, 9)
seg_input = self.seg_stack # (B, H, W, 9)
ref_zero = tf.constant(0, dtype=tf.uint8)
# Motion model is currently defined for three-frame sequences.
object_mask1 = tf.equal(seg_input[:, :, :, 0], ref_zero)
object_mask2 = tf.equal(seg_input[:, :, :, 3], ref_zero)
object_mask3 = tf.equal(seg_input[:, :, :, 6], ref_zero)
mask_complete = tf.expand_dims(tf.logical_and( # (B, H, W, 1)
tf.logical_and(object_mask1, object_mask2), object_mask3), axis=3)
mask_complete = tf.tile(mask_complete, (1, 1, 1, 9)) # (B, H, W, 9)
# Now mask out base_input.
self.mask_complete = tf.to_float(mask_complete)
self.base_input_masked = base_input * self.mask_complete
self.egomotion = nets.egomotion_net(
image_stack=self.base_input_masked,
disp_bottleneck_stack=None,
joint_encoder=False,
seq_length=self.seq_length,
weight_reg=self.weight_reg)
# Define object motion network for refinement. This network only sees
# one object at a time over the whole sequence, and tries to estimate its
# motion. The sequence of images are the respective warped frames.
# For each scale, contains batch_size elements of shape (N, 2, 6).
self.object_transforms = {}
# For each scale, contains batch_size elements of shape (N, H, W, 9).
self.object_masks = {}
self.object_masks_warped = {}
# For each scale, contains batch_size elements of size N.
self.object_ids = {}
self.egomotions_seq = {}
self.warped_seq = {}
self.inputs_objectmotion_net = {}
with tf.variable_scope('objectmotion_prediction'):
# First, warp raw images according to overall egomotion.
for s in range(NUM_SCALES):
self.warped_seq[s] = []
self.egomotions_seq[s] = []
for source_index in range(self.seq_length):
egomotion_mat_i_1 = project.get_transform_mat(
self.egomotion, source_index, 1)
warped_image_i_1, _ = (
project.inverse_warp(
self.image_stack[
:, :, :, source_index*3:(source_index+1)*3],
self.depth_upsampled[1][s],
egomotion_mat_i_1,
self.intrinsic_mat[:, 0, :, :],
self.intrinsic_mat_inv[:, 0, :, :]))
self.warped_seq[s].append(warped_image_i_1)
self.egomotions_seq[s].append(egomotion_mat_i_1)
# Second, for every object in the segmentation mask, take its mask and
# warp it according to the egomotion estimate. Then put a threshold to
# binarize the warped result. Use this mask to mask out background and
# other objects, and pass the filtered image to the object motion
# network.
self.object_transforms[s] = []
self.object_masks[s] = []
self.object_ids[s] = []
self.object_masks_warped[s] = []
self.inputs_objectmotion_net[s] = {}
for i in range(self.batch_size):
seg_sequence = self.seg_stack[i] # (H, W, 9=3*3)
object_ids = tf.unique(tf.reshape(seg_sequence, [-1]))[0]
self.object_ids[s].append(object_ids)
color_stack = []
mask_stack = []
mask_stack_warped = []
for j in range(self.seq_length):
current_image = self.warped_seq[s][j][i] # (H, W, 3)
current_seg = seg_sequence[:, :, j * 3:(j+1) * 3] # (H, W, 3)
def process_obj_mask_warp(obj_id):
"""Performs warping of the individual object masks."""
obj_mask = tf.to_float(tf.equal(current_seg, obj_id))
# Warp obj_mask according to overall egomotion.
obj_mask_warped, _ = (
project.inverse_warp(
tf.expand_dims(obj_mask, axis=0),
# Middle frame, highest scale, batch element i:
tf.expand_dims(self.depth_upsampled[1][s][i], axis=0),
# Matrix for warping j into middle frame, batch elem. i:
tf.expand_dims(self.egomotions_seq[s][j][i], axis=0),
tf.expand_dims(self.intrinsic_mat[i, 0, :, :], axis=0),
tf.expand_dims(self.intrinsic_mat_inv[i, 0, :, :],
axis=0)))
obj_mask_warped = tf.squeeze(obj_mask_warped)
obj_mask_binarized = tf.greater( # Threshold to binarize mask.
obj_mask_warped, tf.constant(0.5))
return tf.to_float(obj_mask_binarized)
def process_obj_mask(obj_id):
"""Returns the individual object masks separately."""
return tf.to_float(tf.equal(current_seg, obj_id))
object_masks = tf.map_fn( # (N, H, W, 3)
process_obj_mask, object_ids, dtype=tf.float32)
if self.size_constraint_weight > 0:
# The object segmentation masks are all in object_masks.
# We need to measure the height of every of them, and get the
# approximate distance.
# self.depth_upsampled of shape (seq_length, scale, B, H, W).
depth_pred = self.depth_upsampled[j][s][i] # (H, W)
def get_losses(obj_mask):
"""Get motion constraint loss."""
# Find height of segment.
coords = tf.where(tf.greater( # Shape (num_true, 2=yx)
obj_mask[:, :, 0], tf.constant(0.5, dtype=tf.float32)))
y_max = tf.reduce_max(coords[:, 0])
y_min = tf.reduce_min(coords[:, 0])
seg_height = y_max - y_min
f_y = self.intrinsic_mat[i, 0, 1, 1]
approx_depth = ((f_y * self.global_scale_var) /
tf.to_float(seg_height))
reference_pred = tf.boolean_mask(
depth_pred, tf.greater(
tf.reshape(obj_mask[:, :, 0],
(self.img_height, self.img_width, 1)),
tf.constant(0.5, dtype=tf.float32)))
# Establish loss on approx_depth, a scalar, and
# reference_pred, our dense prediction. Normalize both to
# prevent degenerative depth shrinking.
global_mean_depth_pred = tf.reduce_mean(depth_pred)
reference_pred /= global_mean_depth_pred
approx_depth /= global_mean_depth_pred
spatial_err = tf.abs(reference_pred - approx_depth)
mean_spatial_err = tf.reduce_mean(spatial_err)
return mean_spatial_err
losses = tf.map_fn(
get_losses, object_masks, dtype=tf.float32)
self.inf_loss += tf.reduce_mean(losses)
object_masks_warped = tf.map_fn( # (N, H, W, 3)
process_obj_mask_warp, object_ids, dtype=tf.float32)
filtered_images = tf.map_fn(
lambda mask: current_image * mask, object_masks_warped,
dtype=tf.float32) # (N, H, W, 3)
color_stack.append(filtered_images)
mask_stack.append(object_masks)
mask_stack_warped.append(object_masks_warped)
# For this batch-element, if there are N moving objects,
# color_stack, mask_stack and mask_stack_warped contain both
# seq_length elements of shape (N, H, W, 3).
# We can now concatenate them on the last axis, creating a tensor of
# (N, H, W, 3*3 = 9), and, assuming N does not get too large so that
# we have enough memory, pass them in a single batch to the object
# motion network.
mask_stack = tf.concat(mask_stack, axis=3) # (N, H, W, 9)
mask_stack_warped = tf.concat(mask_stack_warped, axis=3)
color_stack = tf.concat(color_stack, axis=3) # (N, H, W, 9)
all_transforms = nets.objectmotion_net(
# We cut the gradient flow here as the object motion gradient
# should have no saying in how the egomotion network behaves.
# One could try just stopping the gradient for egomotion, but
# not for the depth prediction network.
image_stack=tf.stop_gradient(color_stack),
disp_bottleneck_stack=None,
joint_encoder=False, # Joint encoder not supported.
seq_length=self.seq_length,
weight_reg=self.weight_reg)
# all_transforms of shape (N, 2, 6).
self.object_transforms[s].append(all_transforms)
self.object_masks[s].append(mask_stack)
self.object_masks_warped[s].append(mask_stack_warped)
self.inputs_objectmotion_net[s][i] = color_stack
tf.get_variable_scope().reuse_variables()
else:
# Don't handle motion, classic model formulation.
with tf.name_scope('egomotion_prediction'):
if self.joint_encoder:
# Re-arrange disp_bottleneck_stack to be of shape
# [B, h_hid, w_hid, c_hid * seq_length]. Currently, it is a list with
# seq_length elements, each of dimension [B, h_hid, w_hid, c_hid].
disp_bottleneck_stack = tf.concat(disp_bottlenecks, axis=3)
else:
disp_bottleneck_stack = None
self.egomotion = nets.egomotion_net(
image_stack=self.image_stack_norm,
disp_bottleneck_stack=disp_bottleneck_stack,
joint_encoder=self.joint_encoder,
seq_length=self.seq_length,
weight_reg=self.weight_reg)
