official/legacy/detection/modeling/olnmask_model.py
# Copyright 2024 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Model defination for the Object Localization Network (OLN) Model."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import tensorflow as tf, tf_keras
from official.legacy.detection.dataloader import anchor
from official.legacy.detection.dataloader import mode_keys
from official.legacy.detection.modeling import losses
from official.legacy.detection.modeling.architecture import factory
from official.legacy.detection.modeling.maskrcnn_model import MaskrcnnModel
from official.legacy.detection.ops import postprocess_ops
from official.legacy.detection.ops import roi_ops
from official.legacy.detection.ops import spatial_transform_ops
from official.legacy.detection.ops import target_ops
from official.legacy.detection.utils import box_utils
class OlnMaskModel(MaskrcnnModel):
"""OLN-Mask model function."""
def __init__(self, params):
super(OlnMaskModel, self).__init__(params)
self._params = params
# Different heads and layers.
self._include_rpn_class = params.architecture.include_rpn_class
self._include_mask = params.architecture.include_mask
self._include_frcnn_class = params.architecture.include_frcnn_class
self._include_frcnn_box = params.architecture.include_frcnn_box
self._include_centerness = params.rpn_head.has_centerness
self._include_box_score = (params.frcnn_head.has_scoring and
params.architecture.include_frcnn_box)
self._include_mask_score = (params.mrcnn_head.has_scoring and
params.architecture.include_mask)
# Architecture generators.
self._backbone_fn = factory.backbone_generator(params)
self._fpn_fn = factory.multilevel_features_generator(params)
self._rpn_head_fn = factory.rpn_head_generator(params)
if self._include_centerness:
self._rpn_head_fn = factory.oln_rpn_head_generator(params)
else:
self._rpn_head_fn = factory.rpn_head_generator(params)
self._generate_rois_fn = roi_ops.OlnROIGenerator(params.roi_proposal)
self._sample_rois_fn = target_ops.ROIScoreSampler(params.roi_sampling)
self._sample_masks_fn = target_ops.MaskSampler(
params.architecture.mask_target_size,
params.mask_sampling.num_mask_samples_per_image)
if self._include_box_score:
self._frcnn_head_fn = factory.oln_box_score_head_generator(params)
else:
self._frcnn_head_fn = factory.fast_rcnn_head_generator(params)
if self._include_mask:
if self._include_mask_score:
self._mrcnn_head_fn = factory.oln_mask_score_head_generator(params)
else:
self._mrcnn_head_fn = factory.mask_rcnn_head_generator(params)
# Loss function.
self._rpn_score_loss_fn = losses.RpnScoreLoss(params.rpn_score_loss)
self._rpn_box_loss_fn = losses.RpnBoxLoss(params.rpn_box_loss)
if self._include_centerness:
self._rpn_iou_loss_fn = losses.OlnRpnIoULoss()
self._rpn_center_loss_fn = losses.OlnRpnCenterLoss()
self._frcnn_class_loss_fn = losses.FastrcnnClassLoss()
self._frcnn_box_loss_fn = losses.FastrcnnBoxLoss(params.frcnn_box_loss)
if self._include_box_score:
self._frcnn_box_score_loss_fn = losses.OlnBoxScoreLoss(
params.frcnn_box_score_loss)
if self._include_mask:
self._mask_loss_fn = losses.MaskrcnnLoss()
self._generate_detections_fn = postprocess_ops.OlnDetectionGenerator(
params.postprocess)
self._transpose_input = params.train.transpose_input
assert not self._transpose_input, 'Transpose input is not supportted.'
def build_outputs(self, inputs, mode):
is_training = mode == mode_keys.TRAIN
model_outputs = {}
image = inputs['image']
_, image_height, image_width, _ = image.get_shape().as_list()
backbone_features = self._backbone_fn(image, is_training)
fpn_features = self._fpn_fn(backbone_features, is_training)
# rpn_centerness.
if self._include_centerness:
rpn_score_outputs, rpn_box_outputs, rpn_center_outputs = (
self._rpn_head_fn(fpn_features, is_training))
model_outputs.update({
'rpn_center_outputs':
tf.nest.map_structure(lambda x: tf.cast(x, tf.float32),
rpn_center_outputs),
})
object_scores = rpn_center_outputs
else:
rpn_score_outputs, rpn_box_outputs = self._rpn_head_fn(
fpn_features, is_training)
object_scores = None
model_outputs.update({
'rpn_score_outputs':
tf.nest.map_structure(lambda x: tf.cast(x, tf.float32),
rpn_score_outputs),
'rpn_box_outputs':
tf.nest.map_structure(lambda x: tf.cast(x, tf.float32),
rpn_box_outputs),
})
input_anchor = anchor.Anchor(self._params.architecture.min_level,
self._params.architecture.max_level,
self._params.anchor.num_scales,
self._params.anchor.aspect_ratios,
self._params.anchor.anchor_size,
(image_height, image_width))
rpn_rois, rpn_roi_scores = self._generate_rois_fn(
rpn_box_outputs,
rpn_score_outputs,
input_anchor.multilevel_boxes,
inputs['image_info'][:, 1, :],
is_training,
is_box_lrtb=self._include_centerness,
object_scores=object_scores,
)
if (not self._include_frcnn_class and
not self._include_frcnn_box and
not self._include_mask):
# if not is_training:
# For direct RPN detection,
# use dummy box_outputs = (dy,dx,dh,dw = 0,0,0,0)
box_outputs = tf.zeros_like(rpn_rois)
box_outputs = tf.concat([box_outputs, box_outputs], -1)
boxes, scores, classes, valid_detections = self._generate_detections_fn(
box_outputs, rpn_roi_scores, rpn_rois,
inputs['image_info'][:, 1:2, :],
is_single_fg_score=True, # if no_background, no softmax is applied.
keep_nms=True)
model_outputs.update({
'num_detections': valid_detections,
'detection_boxes': boxes,
'detection_classes': classes,
'detection_scores': scores,
})
return model_outputs
# ---- OLN-Proposal finishes here. ----
if is_training:
rpn_rois = tf.stop_gradient(rpn_rois)
rpn_roi_scores = tf.stop_gradient(rpn_roi_scores)
# Sample proposals.
(rpn_rois, rpn_roi_scores, matched_gt_boxes, matched_gt_classes,
matched_gt_indices) = (
self._sample_rois_fn(rpn_rois, rpn_roi_scores, inputs['gt_boxes'],
inputs['gt_classes']))
# Create bounding box training targets.
box_targets = box_utils.encode_boxes(
matched_gt_boxes, rpn_rois, weights=[10.0, 10.0, 5.0, 5.0])
# If the target is background, the box target is set to all 0s.
box_targets = tf.where(
tf.tile(
tf.expand_dims(tf.equal(matched_gt_classes, 0), axis=-1),
[1, 1, 4]), tf.zeros_like(box_targets), box_targets)
model_outputs.update({
'class_targets': matched_gt_classes,
'box_targets': box_targets,
})
# Create Box-IoU targets. {
box_ious = box_utils.bbox_overlap(
rpn_rois, inputs['gt_boxes'])
matched_box_ious = tf.reduce_max(box_ious, 2)
model_outputs.update({
'box_iou_targets': matched_box_ious,}) # }
roi_features = spatial_transform_ops.multilevel_crop_and_resize(
fpn_features, rpn_rois, output_size=7)
if not self._include_box_score:
class_outputs, box_outputs = self._frcnn_head_fn(
roi_features, is_training)
else:
class_outputs, box_outputs, score_outputs = self._frcnn_head_fn(
roi_features, is_training)
model_outputs.update({
'box_score_outputs':
tf.nest.map_structure(lambda x: tf.cast(x, tf.float32),
score_outputs),})
model_outputs.update({
'class_outputs':
tf.nest.map_structure(lambda x: tf.cast(x, tf.float32),
class_outputs),
'box_outputs':
tf.nest.map_structure(lambda x: tf.cast(x, tf.float32),
box_outputs),
})
# Add this output to train to make the checkpoint loadable in predict mode.
# If we skip it in train mode, the heads will be out-of-order and checkpoint
# loading will fail.
if not self._include_frcnn_box:
box_outputs = tf.zeros_like(box_outputs) # dummy zeros.
if self._include_box_score:
score_outputs = tf.cast(tf.squeeze(score_outputs, -1),
rpn_roi_scores.dtype)
# box-score = (rpn-centerness * box-iou)^(1/2)
# TR: rpn_roi_scores: b,1000, score_outputs: b,512
# TS: rpn_roi_scores: b,1000, score_outputs: b,1000
box_scores = tf.pow(
rpn_roi_scores * tf.sigmoid(score_outputs), 1/2.)
if not self._include_frcnn_class:
boxes, scores, classes, valid_detections = self._generate_detections_fn(
box_outputs,
box_scores,
rpn_rois,
inputs['image_info'][:, 1:2, :],
is_single_fg_score=True,
keep_nms=True,)
else:
boxes, scores, classes, valid_detections = self._generate_detections_fn(
box_outputs, class_outputs, rpn_rois,
inputs['image_info'][:, 1:2, :],
keep_nms=True,)
model_outputs.update({
'num_detections': valid_detections,
'detection_boxes': boxes,
'detection_classes': classes,
'detection_scores': scores,
})
# ---- OLN-Box finishes here. ----
if not self._include_mask:
return model_outputs
if is_training:
rpn_rois, classes, mask_targets = self._sample_masks_fn(
rpn_rois, matched_gt_boxes, matched_gt_classes, matched_gt_indices,
inputs['gt_masks'])
mask_targets = tf.stop_gradient(mask_targets)
classes = tf.cast(classes, dtype=tf.int32)
model_outputs.update({
'mask_targets': mask_targets,
'sampled_class_targets': classes,
})
else:
rpn_rois = boxes
classes = tf.cast(classes, dtype=tf.int32)
mask_roi_features = spatial_transform_ops.multilevel_crop_and_resize(
fpn_features, rpn_rois, output_size=14)
mask_outputs = self._mrcnn_head_fn(mask_roi_features, classes, is_training)
if is_training:
model_outputs.update({
'mask_outputs':
tf.nest.map_structure(lambda x: tf.cast(x, tf.float32),
mask_outputs),
})
else:
model_outputs.update({'detection_masks': tf.nn.sigmoid(mask_outputs)})
return model_outputs
def build_loss_fn(self):
if self._keras_model is None:
raise ValueError('build_loss_fn() must be called after build_model().')
filter_fn = self.make_filter_trainable_variables_fn()
trainable_variables = filter_fn(self._keras_model.trainable_variables)
def _total_loss_fn(labels, outputs):
if self._include_rpn_class:
rpn_score_loss = self._rpn_score_loss_fn(outputs['rpn_score_outputs'],
labels['rpn_score_targets'])
else:
rpn_score_loss = 0.0
if self._include_centerness:
rpn_center_loss = self._rpn_center_loss_fn(
outputs['rpn_center_outputs'], labels['rpn_center_targets'])
rpn_box_loss = self._rpn_iou_loss_fn(
outputs['rpn_box_outputs'], labels['rpn_box_targets'],
labels['rpn_center_targets'])
else:
rpn_center_loss = 0.0
rpn_box_loss = self._rpn_box_loss_fn(
outputs['rpn_box_outputs'], labels['rpn_box_targets'])
if self._include_frcnn_class:
frcnn_class_loss = self._frcnn_class_loss_fn(
outputs['class_outputs'], outputs['class_targets'])
else:
frcnn_class_loss = 0.0
if self._include_frcnn_box:
frcnn_box_loss = self._frcnn_box_loss_fn(
outputs['box_outputs'], outputs['class_targets'],
outputs['box_targets'])
else:
frcnn_box_loss = 0.0
if self._include_box_score:
box_score_loss = self._frcnn_box_score_loss_fn(
outputs['box_score_outputs'], outputs['box_iou_targets'])
else:
box_score_loss = 0.0
if self._include_mask:
mask_loss = self._mask_loss_fn(outputs['mask_outputs'],
outputs['mask_targets'],
outputs['sampled_class_targets'])
else:
mask_loss = 0.0
model_loss = (
rpn_score_loss + rpn_box_loss + rpn_center_loss +
frcnn_class_loss + frcnn_box_loss + box_score_loss +
mask_loss)
l2_regularization_loss = self.weight_decay_loss(trainable_variables)
total_loss = model_loss + l2_regularization_loss
return {
'total_loss': total_loss,
'loss': total_loss,
'fast_rcnn_class_loss': frcnn_class_loss,
'fast_rcnn_box_loss': frcnn_box_loss,
'fast_rcnn_box_score_loss': box_score_loss,
'mask_loss': mask_loss,
'model_loss': model_loss,
'l2_regularization_loss': l2_regularization_loss,
'rpn_score_loss': rpn_score_loss,
'rpn_box_loss': rpn_box_loss,
'rpn_center_loss': rpn_center_loss,
}
return _total_loss_fn
def build_input_layers(self, params, mode):
is_training = mode == mode_keys.TRAIN
input_shape = (
params.olnmask_parser.output_size +
[params.olnmask_parser.num_channels])
if is_training:
batch_size = params.train.batch_size
input_layer = {
'image':
tf_keras.layers.Input(
shape=input_shape,
batch_size=batch_size,
name='image',
dtype=tf.bfloat16 if self._use_bfloat16 else tf.float32),
'image_info':
tf_keras.layers.Input(
shape=[4, 2],
batch_size=batch_size,
name='image_info',
),
'gt_boxes':
tf_keras.layers.Input(
shape=[params.olnmask_parser.max_num_instances, 4],
batch_size=batch_size,
name='gt_boxes'),
'gt_classes':
tf_keras.layers.Input(
shape=[params.olnmask_parser.max_num_instances],
batch_size=batch_size,
name='gt_classes',
dtype=tf.int64),
}
if self._include_mask:
input_layer['gt_masks'] = tf_keras.layers.Input(
shape=[
params.olnmask_parser.max_num_instances,
params.olnmask_parser.mask_crop_size,
params.olnmask_parser.mask_crop_size
],
batch_size=batch_size,
name='gt_masks')
else:
batch_size = params.eval.batch_size
input_layer = {
'image':
tf_keras.layers.Input(
shape=input_shape,
batch_size=batch_size,
name='image',
dtype=tf.bfloat16 if self._use_bfloat16 else tf.float32),
'image_info':
tf_keras.layers.Input(
shape=[4, 2],
batch_size=batch_size,
name='image_info',
),
}
return input_layer
def build_model(self, params, mode):
if self._keras_model is None:
input_layers = self.build_input_layers(self._params, mode)
outputs = self.model_outputs(input_layers, mode)
model = tf_keras.models.Model(
inputs=input_layers, outputs=outputs, name='olnmask')
assert model is not None, 'Fail to build tf_keras.Model.'
model.optimizer = self.build_optimizer()
self._keras_model = model
return self._keras_model