def freeze_model(model, config, score_threshold=0.5):
classification, regression = model.outputs
anchors = anchors_for_shape(
image_shape=config.input_shape,
sizes=config.sizes,
ratios=config.ratios,
scales=config.scales,
strides=config.strides,
pyramid_levels=[3, 4, 5, 6, 7],
shapes_callback=None,
)
# apply predicted regression to anchors
anchors = tf.convert_to_tensor(anchors)
anchors_input = tf.expand_dims(anchors, axis=0)
boxes = RegressBoxes(name='boxes')([anchors_input, regression[..., :4]])
boxes = ClipBoxes(name='clipped_boxes')([model.input, boxes])
# filter detections (apply NMS / score threshold / select top-k)
# if detect_quadrangle:
# detections = FilterDetections(
# name='filtered_detections',
# score_threshold=score_threshold,
# detect_quadrangle=True
# )([boxes, classification, regression[..., 4:8], regression[..., 8]])
# else:
detections = FilterDetections(name='filtered_detections',
score_threshold=score_threshold)(
[boxes, classification])
prediction_model = models.Model(inputs=model.input,
outputs=detections,
name='efficientdet_p')
return prediction_model
def __init__(self, num_classes, block, layers):
self.inplanes = 64
super(ResNet, self).__init__()
self.conv1 = nn.Conv2d(3, 64, kernel_size=7, stride=2, padding=3, bias=False)
self.bn1 = nn.BatchNorm2d(64)
self.relu = nn.ReLU(inplace=True)
self.maxpool = nn.MaxPool2d(kernel_size=3, stride=2, padding=1)
self.layer1 = self._make_layer(block, 64, layers[0])
self.layer2 = self._make_layer(block, 128, layers[1], stride=2)
self.layer3 = self._make_layer(block, 256, layers[2], stride=2)
self.layer4 = self._make_layer(block, 512, layers[3], stride=2)
if block == BasicBlock:
fpn_sizes = [self.layer1[layers[0] - 1].conv2.out_channels, self.layer2[layers[1] - 1].conv2.out_channels,
self.layer3[layers[2] - 1].conv2.out_channels, self.layer4[layers[3] - 1].conv2.out_channels]
elif block == Bottleneck:
fpn_sizes = [self.layer1[layers[0] - 1].conv3.out_channels, self.layer2[layers[1] - 1].conv3.out_channels,
self.layer3[layers[2] - 1].conv3.out_channels, self.layer4[layers[3] - 1].conv3.out_channels]
else:
raise ValueError(f"Block type {block} not understood")
self.fpn = PyramidFeatures(fpn_sizes[0], fpn_sizes[1], fpn_sizes[2], fpn_sizes[3])
self.regressionModel = RegressionModel(256)
self.classificationModel = ClassificationModel(256, num_classes=num_classes)
self.contextModel = LevelAttentionModel(256)
self.anchors = Anchors()
self.regressBoxes = BBoxTransform()
self.clipBoxes = ClipBoxes()
self.contextLoss = losses.Con()
self.focalLoss = losses.FocalLoss()
for m in self.modules():
if isinstance(m, nn.Conv2d):
n = m.kernel_size[0] * m.kernel_size[1] * m.out_channels
m.weight.data.normal_(0, math.sqrt(2. / n))
# init.xavier_normal(m.weight)
elif isinstance(m, nn.BatchNorm2d):
m.weight.data.fill_(1)
m.bias.data.zero_()
prior = 0.01
self.classificationModel.output.weight.data.fill_(0)
self.classificationModel.output.bias.data.fill_(-math.log((1.0 - prior) / prior))
self.regressionModel.output.weight.data.fill_(0)
self.regressionModel.output.bias.data.fill_(0)
self.levelattentionModel.conv5.weight.data.fill_(0)
self.levelattentionModel.conv5.bias.data.fill_(0)
self.freeze_bn()
def efficientdet(phi, num_classes=20, num_anchors=9, weighted_bifpn=False, freeze_bn=False,
score_threshold=0.01, detect_quadrangle=False, anchor_parameters=None, separable_conv=True):
assert phi in range(7)
input_size = image_sizes[phi]
input_shape = (input_size, input_size, 3)
image_input = layers.Input(input_shape)
w_bifpn = w_bifpns[phi]
d_bifpn = d_bifpns[phi]
w_head = w_bifpn
d_head = d_heads[phi]
backbone_cls = backbones[phi]
features = backbone_cls(input_tensor=image_input, freeze_bn=freeze_bn)
if weighted_bifpn:
fpn_features = features
for i in range(d_bifpn):
fpn_features = build_wBiFPN(fpn_features, w_bifpn, i, freeze_bn=freeze_bn)
else:
fpn_features = features
for i in range(d_bifpn):
fpn_features = build_BiFPN(fpn_features, w_bifpn, i, freeze_bn=freeze_bn)
box_net = BoxNet(w_head, d_head, num_anchors=num_anchors, separable_conv=separable_conv, freeze_bn=freeze_bn,
detect_quadrangle=detect_quadrangle, name='box_net')
class_net = ClassNet(w_head, d_head, num_classes=num_classes, num_anchors=num_anchors,
separable_conv=separable_conv, freeze_bn=freeze_bn, name='class_net')
classification = [class_net([feature, i]) for i, feature in enumerate(fpn_features)]
classification = layers.Concatenate(axis=1, name='classification')(classification)
regression = [box_net([feature, i]) for i, feature in enumerate(fpn_features)]
regression = layers.Concatenate(axis=1, name='regression')(regression)
model = models.Model(inputs=[image_input], outputs=[classification, regression], name='efficientdet')
# apply predicted regression to anchors
anchors = anchors_for_shape((input_size, input_size), anchor_params=anchor_parameters)
anchors_input = np.expand_dims(anchors, axis=0)
boxes = RegressBoxes(name='boxes')([anchors_input, regression[..., :4]])
boxes = ClipBoxes(name='clipped_boxes')([image_input, boxes])
# filter detections (apply NMS / score threshold / select top-k)
if detect_quadrangle:
detections = FilterDetections(
name='filtered_detections',
score_threshold=score_threshold,
detect_quadrangle=True
)([boxes, classification, regression[..., 4:8], regression[..., 8]])
else:
detections = FilterDetections(
name='filtered_detections',
score_threshold=score_threshold
)([boxes, classification])
prediction_model = models.Model(inputs=[image_input], outputs=detections, name='efficientdet_p')
return model, prediction_model
def efficientdet(phi,
num_classes=20,
weighted_bifpn=False,
freeze_bn=False,
score_threshold=0.01):
assert phi in range(7)
input_size = image_sizes[phi]
input_shape = (input_size, input_size, 3)
# input_shape = (None, None, 3)
image_input = layers.Input(input_shape)
w_bifpn = w_bifpns[phi]
d_bifpn = 2 + phi
w_head = w_bifpn
d_head = 3 + int(phi / 3)
backbone_cls = backbones[phi]
# features = backbone_cls(include_top=False, input_shape=input_shape, weights=weights)(image_input)
features = backbone_cls(input_tensor=image_input, freeze_bn=freeze_bn)
if weighted_bifpn:
for i in range(d_bifpn):
features = build_wBiFPN(features, w_bifpn, i, freeze_bn=freeze_bn)
else:
for i in range(d_bifpn):
features = build_BiFPN(features, w_bifpn, i, freeze_bn=freeze_bn)
regress_head = build_regress_head(w_head, d_head)
class_head = build_class_head(w_head, d_head, num_classes=num_classes)
regression = [regress_head(feature) for feature in features]
regression = layers.Concatenate(axis=1, name='regression')(regression)
classification = [class_head(feature) for feature in features]
classification = layers.Concatenate(axis=1,
name='classification')(classification)
model = models.Model(inputs=[image_input],
outputs=[regression, classification],
name='efficientdet')
# apply predicted regression to anchors
# anchors = tf.tile(tf.expand_dims(tf.constant(anchors), axis=0), (tf.shape(regression)[0], 1, 1))
anchors_input = layers.Input((None, 4))
boxes = RegressBoxes(name='boxes')([anchors_input, regression])
boxes = ClipBoxes(name='clipped_boxes')([image_input, boxes])
# filter detections (apply NMS / score threshold / select top-k)
detections = FilterDetections(name='filtered_detections',
score_threshold=score_threshold)(
[boxes, classification])
prediction_model = models.Model(inputs=[image_input, anchors_input],
outputs=detections,
name='efficientdet_p')
return model, prediction_model
def efficientdet(num_anchors, num_classes, num_properties, w_bifpn, d_bifpn,
d_head, score_threshold, nms_threshold):
image_input = layers.Input(shape=(None, None, 3))
w_head = w_bifpn
backbone_cls = backbones[0]
# [(?, 256, 256, 16), (?, 128, 128, 24),(?, 64, 64, 24),(?, 32,32, 24),(?, 16, 16, 24)]
features = backbone_cls(input_tensor=image_input)
fpn_features = features
for i in range(d_bifpn):
fpn_features = build_wBiFPN(fpn_features, w_bifpn, i)
reg = regression_coco(fpn_features, w_head, d_head, num_anchors)
cls = classification_coco(fpn_features, w_head, d_head, num_anchors,
num_classes)
pro = properties_sand(fpn_features, w_head, d_head, num_anchors,
num_properties)
model = models.Model(inputs=[image_input],
outputs=[reg, cls, pro],
name='efficientdet')
anchors_input = layers.Input((None, 4), name='anchors_input')
boxes = RegressBoxes(name='boxes')([anchors_input, reg])
boxes = ClipBoxes(name='clipped_boxes')([image_input, boxes])
# filter detections (apply NMS / score threshold / select top-k)
# boxes (?, 49104, 4) (?, 49104, 1) (?, 49104, 3)
detections = FilterDetections(name='filtered_detections',
score_threshold=score_threshold,
nms_threshold=nms_threshold,
class_specific_filter=True,
max_detections=100)([boxes, cls, pro])
prediction_model = models.Model(inputs=[image_input, anchors_input],
outputs=detections,
name='efficientdet_p')
return model, prediction_model
def efficientdet_sand(num_anchors, num_classes, num_properties, w_bifpn,
d_bifpn, d_head, score_threshold, nms_threshold):
image_input = layers.Input(shape=(None, None, 3))
w_head = w_bifpn
backbone_cls = backbones[0]
# [(?, 256, 256, 16), (?, 128, 128, 24),(?, 64, 64, 24),(?, 32,32, 24),(?, 16, 16, 24)]
features = backbone_cls(input_tensor=image_input)
fpn_features = features
for i in range(d_bifpn):
fpn_features = build_wBiFPN(fpn_features, w_bifpn, i)
reg = regression_coco(fpn_features, w_head, d_head, num_anchors)
cls = classification_coco(fpn_features, w_head, d_head, num_anchors, 90)
coco_model = models.Model(inputs=[image_input],
outputs=[reg, cls],
name='efficientdet_coco')
path = os.path.join(os.path.dirname(__file__),
'weights/efficientdet-d0.h5')
coco_model.load_weights(path, by_name=True)
# for i in range(1, 227): # 321
# coco_model.layers[i].trainable = False
# coco_model.layers[i].training = False
P3_out = coco_model.get_layer(
name='fpn_cells/cell_2/fnode3/op_after_combine8/bn').output
P4_td = coco_model.get_layer(
name='fpn_cells/cell_2/fnode2/op_after_combine7/bn').output
P5_td = coco_model.get_layer(
name='fpn_cells/cell_2/fnode1/op_after_combine6/bn').output
P6_td = coco_model.get_layer(
name='fpn_cells/cell_2/fnode0/op_after_combine5/bn').output
P7_out = coco_model.get_layer(
name='fpn_cells/cell_2/fnode7/op_after_combine12/bn').output
tmp_fpn_features = [P3_out, P4_td, P5_td, P6_td, P7_out]
sand_reg = regression_sand(tmp_fpn_features, w_head, d_head, num_anchors)
sand_cls = classification_sand(tmp_fpn_features, w_head, d_head,
num_anchors, num_classes)
sand_pro = properties_sand(tmp_fpn_features, w_head, d_head, num_anchors,
num_properties)
sand_model = models.Model(inputs=[image_input],
outputs=[sand_reg, sand_cls, sand_pro],
name='efficientdet_sand')
anchors_input = layers.Input((None, 4), name='anchors_input')
boxes = RegressBoxes(name='boxes')([anchors_input, sand_reg])
boxes = ClipBoxes(name='clipped_boxes')([image_input, boxes])
# filter detections (apply NMS / score threshold / select top-k)
# boxes (?, 49104, 4) (?, 49104, 1) (?, 49104, 3)
detections = FilterDetections(
name='filtered_detections',
score_threshold=score_threshold,
nms_threshold=nms_threshold,
class_specific_filter=True,
max_detections=100)([boxes, sand_cls, sand_pro])
prediction_model = models.Model(inputs=[image_input, anchors_input],
outputs=detections,
name='efficientdet_p')
return sand_model, prediction_model
def sapd(
phi,
soft_select=False,
num_classes=20,
freeze_bn=False,
max_gt_boxes=100,
batch_size=32,
score_threshold=0.01,
):
assert phi in range(7)
image_size = image_sizes[phi]
input_shape = (image_size, image_size, 3)
# input_shape = (None, None, 3)
image_input = layers.Input(input_shape)
gt_boxes_input = layers.Input((max_gt_boxes, 5))
num_gt_boxes_input = layers.Input((1, ), dtype='int32')
fm_shapes_input = layers.Input((5, 2), dtype='int32')
backbone_cls = backbones[phi]
# (C1, C2, C3, C4, C5)
features = backbone_cls(input_tensor=image_input, freeze_bn=freeze_bn)
w_bifpn = w_bifpns[phi]
d_bifpn = 2 + phi
w_head = w_bifpn
d_head = 3 + int(phi / 3)
for i in range(d_bifpn):
features = build_BiFPN(features, w_bifpn, i, freeze_bn=freeze_bn)
regr_head = build_regress_head(w_head, d_head)
cls_head = build_class_head(w_head, d_head, num_classes=num_classes)
pyramid_features = features
fpn_width = w_head
cls_pred = [cls_head(feature) for feature in pyramid_features]
cls_pred = layers.Concatenate(axis=1, name='classification')(cls_pred)
regr_pred = [regr_head(feature) for feature in pyramid_features]
regr_pred = layers.Concatenate(axis=1, name='regression')(regr_pred)
# meta select net
meta_select_net = build_meta_select_net(width=fpn_width)
meta_select_input, gt_boxes_batch_ids = MetaSelectInput()(
[gt_boxes_input, *pyramid_features])
meta_select_pred = meta_select_net(meta_select_input)
meta_select_target = MetaSelectTarget()(
[cls_pred, regr_pred, fm_shapes_input, gt_boxes_input])
# # lambda == 0.1 in paper
meta_select_loss = layers.Lambda(
lambda x: 0.1 * losses.sparse_categorical_crossentropy(x[0], x[1]),
output_shape=(1, ),
name="meta_select_loss")([meta_select_target, meta_select_pred])
if soft_select:
meta_select_weight = MetaSelectWeight(
max_gt_boxes=max_gt_boxes,
soft_select=soft_select,
batch_size=batch_size,
)([meta_select_pred, gt_boxes_batch_ids, num_gt_boxes_input])
else:
meta_select_weight = MetaSelectWeight(
max_gt_boxes=max_gt_boxes,
soft_select=soft_select,
batch_size=batch_size,
)([meta_select_target, gt_boxes_batch_ids, num_gt_boxes_input])
cls_target, regr_target = SAPDTarget(num_classes=num_classes)(
[fm_shapes_input, gt_boxes_input, meta_select_weight])
focal_loss = focal_with_weight_and_mask()
iou_loss = iou_with_weight_and_mask()
cls_loss = layers.Lambda(focal_loss, output_shape=(1, ),
name="cls_loss")([cls_target, cls_pred])
regr_loss = layers.Lambda(iou_loss, output_shape=(1, ),
name="regr_loss")([regr_target, regr_pred])
model = models.Model(inputs=[
image_input, gt_boxes_input, num_gt_boxes_input, fm_shapes_input
],
outputs=[
cls_loss, regr_loss, meta_select_loss, cls_pred,
regr_pred, cls_target, regr_target
],
name='sapd')
locations, strides = Locations()(pyramid_features)
# apply predicted regression to anchors
boxes = RegressBoxes(name='boxes')([locations, strides, regr_pred])
boxes = ClipBoxes(name='clipped_boxes')([image_input, boxes])
# filter detections (apply NMS / score threshold / select top-k)
detections = FilterDetections(name='filtered_detections',
score_threshold=score_threshold)(
[boxes, cls_pred])
prediction_model = models.Model(inputs=[image_input],
outputs=detections,
name='sapd_p')
return model, prediction_model
def apply_subnets_to_feature_maps(box_net, class_net, rotation_net,
translation_net, fpn_feature_maps,
image_input, camera_parameters_input,
input_size, anchor_parameters):
"""
Applies the subnetworks to the BiFPN feature maps
Args:
box_net, class_net, rotation_net, translation_net: Subnetworks
fpn_feature_maps: Sequence of the BiFPN feature maps of the different levels (P3, P4, P5, P6, P7)
image_input, camera_parameters_input: The image and camera parameter input layer
input size: Integer representing the input image resolution
anchor_parameters: Struct containing anchor parameters. If None, default values are used.
Returns:
classification: Tensor containing the classification outputs for all anchor boxes. Shape (batch_size, num_anchor_boxes, num_classes)
bbox_regression: Tensor containing the deltas of anchor boxes to the GT 2D bounding boxes for all anchor boxes. Shape (batch_size, num_anchor_boxes, 4)
rotation: Tensor containing the rotation outputs for all anchor boxes. Shape (batch_size, num_anchor_boxes, num_rotation_parameters)
translation: Tensor containing the translation outputs for all anchor boxes. Shape (batch_size, num_anchor_boxes, 3)
transformation: Tensor containing the concatenated rotation and translation outputs for all anchor boxes. Shape (batch_size, num_anchor_boxes, num_rotation_parameters + 3)
Rotation and Translation are concatenated because the Keras Loss function takes only one GT and prediction tensor respectively as input but the transformation loss needs both
bboxes: Tensor containing the 2D bounding boxes for all anchor boxes. Shape (batch_size, num_anchor_boxes, 4)
"""
classification = [
class_net([feature, i]) for i, feature in enumerate(fpn_feature_maps)
]
classification = layers.Concatenate(axis=1,
name='classification')(classification)
bbox_regression = [
box_net([feature, i]) for i, feature in enumerate(fpn_feature_maps)
]
bbox_regression = layers.Concatenate(axis=1,
name='regression')(bbox_regression)
rotation = [
rotation_net([feature, i])
for i, feature in enumerate(fpn_feature_maps)
]
rotation = layers.Concatenate(axis=1, name='rotation')(rotation)
translation_raw = [
translation_net([feature, i])
for i, feature in enumerate(fpn_feature_maps)
]
translation_raw = layers.Concatenate(
axis=1, name='translation_raw_outputs')(translation_raw)
#get anchors and apply predicted translation offsets to translation anchors
anchors, translation_anchors = anchors_for_shape(
(input_size, input_size), anchor_params=anchor_parameters)
translation_anchors_input = np.expand_dims(translation_anchors, axis=0)
translation_xy_Tz = RegressTranslation(name='translation_regression')(
[translation_anchors_input, translation_raw])
translation = CalculateTxTy(name='translation')(
translation_xy_Tz,
fx=camera_parameters_input[:, 0],
fy=camera_parameters_input[:, 1],
px=camera_parameters_input[:, 2],
py=camera_parameters_input[:, 3],
tz_scale=camera_parameters_input[:, 4],
image_scale=camera_parameters_input[:, 5])
# apply predicted 2D bbox regression to anchors
anchors_input = np.expand_dims(anchors, axis=0)
bboxes = RegressBoxes(name='boxes')(
[anchors_input, bbox_regression[..., :4]])
bboxes = ClipBoxes(name='clipped_boxes')([image_input, bboxes])
#concat rotation and translation outputs to transformation output to have a single output for transformation loss calculation
#standard concatenate layer throws error that shapes does not match because translation shape dim 2 is known via translation_anchors and rotation shape dim 2 is None
#so just use lambda layer with tf concat
transformation = layers.Lambda(
lambda input_list: tf.concat(input_list, axis=-1),
name="transformation")([rotation, translation])
return classification, bbox_regression, rotation, translation, transformation, bboxes
def yolo_body(num_classes=20, score_threshold=0.01):
"""
Create YOLO_V3 model CNN body in Keras.
Args:
num_classes:
score_threshold:
Returns:
"""
image_input = Input(shape=(None, None, 3), name='image_input')
darknet = Model([image_input], darknet_body(image_input))
##################################################
# build fsaf head
##################################################
x, y1 = make_last_layers(darknet.output, 512, 4 + num_classes)
x = compose(darknet_conv2d_bn_leaky(256, (1, 1)), UpSampling2D(2))(x)
x = Concatenate()([x, darknet.layers[152].output])
x, y2 = make_last_layers(x, 256, 4 + num_classes)
x = compose(darknet_conv2d_bn_leaky(128, (1, 1)), UpSampling2D(2))(x)
x = Concatenate()([x, darknet.layers[92].output])
x, y3 = make_last_layers(x, 128, 4 + num_classes)
y1_ = Reshape((-1, 4 + num_classes))(y1)
y2_ = Reshape((-1, 4 + num_classes))(y2)
y3_ = Reshape((-1, 4 + num_classes))(y3)
y = Concatenate(axis=1)([y1_, y2_, y3_])
batch_cls_pred = Lambda(lambda x: x[..., 4:])(y)
batch_regr_pred = Lambda(lambda x: x[..., :4])(y)
batch_cls_pred = Activation('sigmoid')(batch_cls_pred)
batch_regr_pred = Activation('relu')(batch_regr_pred)
gt_boxes_input = Input(shape=(config.MAX_NUM_GT_BOXES, 5),
name='gt_boxes_input')
grid_shapes_input = Input((len(config.STRIDES), 2),
dtype='int32',
name='grid_shapes_input')
batch_gt_box_levels = LevelSelect(name='level_select')(
[batch_cls_pred, batch_regr_pred, grid_shapes_input, gt_boxes_input])
batch_cls_target, batch_cls_mask, batch_cls_num_pos, batch_regr_target, batch_regr_mask = FSAFTarget(
num_classes=num_classes, name='fsaf_target')(
[batch_gt_box_levels, grid_shapes_input, gt_boxes_input])
focal_loss_graph = focal_with_mask()
iou_loss_graph = iou_with_mask()
cls_loss = Lambda(focal_loss_graph, output_shape=(1, ), name="cls_loss")(
[batch_cls_target, batch_cls_pred, batch_cls_mask, batch_cls_num_pos])
regr_loss = Lambda(iou_loss_graph, output_shape=(1, ), name="regr_loss")(
[batch_regr_target, batch_regr_pred, batch_regr_mask])
model = Model(inputs=[image_input, gt_boxes_input, grid_shapes_input],
outputs=[cls_loss, regr_loss],
name='fsaf')
# compute the anchors
features = [y1, y2, y3]
locations, strides = Locations(strides=config.STRIDES)(features)
# apply predicted regression to anchors
boxes = RegressBoxes(name='boxes')([locations, strides, batch_regr_pred])
boxes = ClipBoxes(name='clipped_boxes')([image_input, boxes])
# filter detections (apply NMS / score threshold / select top-k)
detections = FilterDetections(
nms=True,
class_specific_filter=True,
name='filtered_detections',
score_threshold=score_threshold)([boxes, batch_cls_pred])
prediction_model = Model(inputs=image_input,
outputs=detections,
name='fsaf_detection')
return model, prediction_model
