def tiny_yolo3_xception_body(inputs, num_anchors, num_classes):
'''Create Tiny YOLO_v3 Xception model CNN body in keras.'''
xception = Xception(input_tensor=inputs, weights='imagenet', include_top=False)
print('backbone layers number: {}'.format(len(xception.layers)))
# input: 416 x 416 x 3
# block14_sepconv2_act: 13 x 13 x 2048
# block13_sepconv2_bn(middle in block13): 26 x 26 x 1024
# add_46(end of block12): 26 x 26 x 728
# block4_sepconv2_bn(middle in block4) : 52 x 52 x 728
# add_37(end of block3) : 52 x 52 x 256
# f1 :13 x 13 x 2048
f1 = xception.get_layer('block14_sepconv2_act').output
# f2 :26 x 26 x 1024
f2 = xception.get_layer('block13_sepconv2_bn').output
f1_channel_num = 2048
f2_channel_num = 1024
#f1_channel_num = 1024
#f2_channel_num = 512
y1, y2 = tiny_yolo3_predictions((f1, f2), (f1_channel_num, f2_channel_num), num_anchors, num_classes)
return Model(inputs, [y1,y2])
def tiny_yolo3_mobilenetv3small_body(inputs, num_anchors, num_classes, alpha=1.0):
'''Create Tiny YOLO_v3 MobileNetV3Small model CNN body in keras.'''
mobilenetv3small = MobileNetV3Small(input_tensor=inputs, weights='imagenet', include_top=False, alpha=alpha)
print('backbone layers number: {}'.format(len(mobilenetv3small.layers)))
# input: 416 x 416 x 3
# activation_31(layer 165, final feature map): 13 x 13 x (576*alpha)
# expanded_conv_10/Add(layer 162, end of block10): 13 x 13 x (96*alpha)
# activation_22(layer 117, middle in block8) : 26 x 26 x (288*alpha)
# expanded_conv_7/Add(layer 114, end of block7) : 26 x 26 x (48*alpha)
# activation_7(layer 38, middle in block3) : 52 x 52 x (96*alpha)
# expanded_conv_2/Add(layer 35, end of block2): 52 x 52 x (24*alpha)
# NOTE: activation layer name may different for TF1.x/2.x, so we
# use index to fetch layer
# f1 :13 x 13 x (576*alpha)
f1 = mobilenetv3small.layers[165].output
# f2: 26 x 26 x (288*alpha)
f2 = mobilenetv3small.layers[117].output
f1_channel_num = int(576*alpha)
f2_channel_num = int(288*alpha)
#f1_channel_num = 1024
#f2_channel_num = 512
y1, y2 = tiny_yolo3_predictions((f1, f2), (f1_channel_num, f2_channel_num), num_anchors, num_classes)
return Model(inputs, [y1,y2])
def tiny_yolo3_shufflenetv2_body(inputs, num_anchors, num_classes):
'''Create Tiny YOLO_v3 ShuffleNetV2 model CNN body in keras.'''
shufflenetv2 = ShuffleNetV2(input_tensor=inputs,
weights=None,
include_top=False)
print('backbone layers number: {}'.format(len(shufflenetv2.layers)))
# input: 416 x 416 x 3
# 1x1conv5_out: 13 x 13 x 1024
# stage4/block1/relu_1x1conv_1: 26 x 26 x 464
# stage3/block1/relu_1x1conv_1: 52 x 52 x 232
# f1: 13 x 13 x 1024
f1 = shufflenetv2.get_layer('1x1conv5_out').output
# f2: 26 x 26 x 464
f2 = shufflenetv2.get_layer('stage4/block1/relu_1x1conv_1').output
f1_channel_num = 1024
f2_channel_num = 464
#f1_channel_num = 1024
#f2_channel_num = 512
y1, y2 = tiny_yolo3_predictions((f1, f2), (f1_channel_num, f2_channel_num),
num_anchors, num_classes)
return Model(inputs, [y1, y2])
def tiny_yolo3_peleenet_body(inputs, num_anchors, num_classes):
'''Create Tiny YOLO_v3 PeleeNet model CNN body in keras.'''
peleenet = PeleeNet(input_tensor=inputs,
weights='imagenet',
include_top=False)
print('backbone layers number: {}'.format(len(peleenet.layers)))
# input: 416 x 416 x 3
# re_lu_338(layer 365, final feature map): 13 x 13 x 704
# re_lu_307(layer 265, end of stride 16) : 26 x 26 x 512
# re_lu_266(layer 133, end of stride 8) : 52 x 52 x 256
# NOTE: activation layer name may different for TF1.x/2.x, so we
# use index to fetch layer
# f1: 13 x 13 x 704
f1 = peleenet.layers[365].output
# f2: 26 x 26 x 512
f2 = peleenet.layers[265].output
# f3: 52 x 52 x 256
f3 = peleenet.layers[133].output
f1_channel_num = 704
f2_channel_num = 512
y1, y2 = tiny_yolo3_predictions((f1, f2), (f1_channel_num, f2_channel_num),
num_anchors, num_classes)
return Model(inputs, [y1, y2])
def tiny_yolo3_ghostnet_body(inputs, num_anchors, num_classes):
'''Create Tiny YOLO_v3 GhostNet model CNN body in keras.'''
ghostnet = GhostNet(input_tensor=inputs,
weights='imagenet',
include_top=False)
print('backbone layers number: {}'.format(len(ghostnet.layers)))
# input: 416 x 416 x 3
# blocks_9_0_relu(layer 291, final feature map): 13 x 13 x 960
# blocks_8_3_add(layer 288, end of block8): 13 x 13 x 160
# blocks_7_0_ghost1_concat(layer 203, middle in block7) : 26 x 26 x 672
# blocks_6_4_add(layer 196, end of block6) : 26 x 26 x 112
# blocks_5_0_ghost1_concat(layer 101, middle in block5) : 52 x 52 x 240
# blocks_4_0_add(layer 94, end of block4): 52 x 52 x 40
# NOTE: activation layer name may different for TF1.x/2.x, so we
# use index to fetch layer
# f1: 13 x 13 x 960
f1 = ghostnet.layers[291].output
# f2: 26 x 26 x 672
f2 = ghostnet.layers[203].output
# f3: 52 x 52 x 240
#f3 = ghostnet.layers[101].output
f1_channel_num = 960
f2_channel_num = 672
#f3_channel_num = 240
y1, y2 = tiny_yolo3_predictions((f1, f2), (f1_channel_num, f2_channel_num),
num_anchors, num_classes)
return Model(inputs, [y1, y2])
def tiny_yolo3_mobilenet_body(inputs, num_anchors, num_classes, alpha=1.0):
'''Create Tiny YOLO_v3 MobileNet model CNN body in keras.'''
mobilenet = MobileNet(input_tensor=inputs,
weights='imagenet',
include_top=False,
alpha=alpha)
print('backbone layers number: {}'.format(len(mobilenet.layers)))
# input: 416 x 416 x 3
# conv_pw_13_relu :13 x 13 x (1024*alpha)
# conv_pw_11_relu :26 x 26 x (512*alpha)
# conv_pw_5_relu : 52 x 52 x (256*alpha)
# f1: 13 x 13 x (1024*alpha)
f1 = mobilenet.get_layer('conv_pw_13_relu').output
# f2: 26 x 26 x (512*alpha)
f2 = mobilenet.get_layer('conv_pw_11_relu').output
f1_channel_num = int(1024 * alpha)
f2_channel_num = int(512 * alpha)
y1, y2 = tiny_yolo3_predictions((f1, f2), (f1_channel_num, f2_channel_num),
num_anchors, num_classes)
return Model(inputs, [y1, y2])
def tiny_yolo3_mobilenetv2_body(inputs, num_anchors, num_classes, alpha=1.0):
'''Create Tiny YOLO_v3 MobileNetV2 model CNN body in keras.'''
mobilenetv2 = MobileNetV2(input_tensor=inputs,
weights='imagenet',
include_top=False,
alpha=alpha)
print('backbone layers number: {}'.format(len(mobilenetv2.layers)))
# input: 416 x 416 x 3
# out_relu: 13 x 13 x 1280
# block_13_expand_relu: 26 x 26 x (576*alpha)
# block_6_expand_relu: 52 x 52 x (192*alpha)
# f1 :13 x 13 x 1280
f1 = mobilenetv2.get_layer('out_relu').output
# f2: 26 x 26 x (576*alpha)
f2 = mobilenetv2.get_layer('block_13_expand_relu').output
f1_channel_num = int(1280 * alpha)
f2_channel_num = int(576 * alpha)
#f1_channel_num = 1024
#f2_channel_num = 512
y1, y2 = tiny_yolo3_predictions((f1, f2), (f1_channel_num, f2_channel_num),
num_anchors, num_classes)
return Model(inputs, [y1, y2])
def tiny_yolo3_mobilenetv3large_body(inputs, num_anchors, num_classes, alpha=1.0):
'''Create Tiny YOLO_v3 MobileNetV3Large model CNN body in keras.'''
mobilenetv3large = MobileNetV3Large(input_tensor=inputs, weights='imagenet', include_top=False, alpha=alpha)
print('backbone layers number: {}'.format(len(mobilenetv3large.layers)))
# input: 416 x 416 x 3
# activation_38(layer 194, final feature map): 13 x 13 x (960*alpha)
# expanded_conv_14/Add(layer 191, end of block14): 13 x 13 x (160*alpha)
# activation_29(layer 146, middle in block12) : 26 x 26 x (672*alpha)
# expanded_conv_11/Add(layer 143, end of block11) : 26 x 26 x (112*alpha)
# activation_15(layer 79, middle in block6) : 52 x 52 x (240*alpha)
# expanded_conv_5/Add(layer 76, end of block5): 52 x 52 x (40*alpha)
# NOTE: activation layer name may different for TF1.x/2.x, so we
# use index to fetch layer
# f1 :13 x 13 x (960*alpha)
f1 = mobilenetv3large.layers[194].output
# f2: 26 x 26 x (672*alpha)
f2 = mobilenetv3large.layers[146].output
f1_channel_num = int(960*alpha)
f2_channel_num = int(672*alpha)
#f1_channel_num = 1024
#f2_channel_num = 512
y1, y2 = tiny_yolo3_predictions((f1, f2), (f1_channel_num, f2_channel_num), num_anchors, num_classes)
return Model(inputs, [y1,y2])
def tiny_yolo3_efficientnet_body(inputs, num_anchors, num_classes, level=0):
'''
Create Tiny YOLO_v3 EfficientNet model CNN body in keras.
# Arguments
level: EfficientNet level number.
by default we use basic EfficientNetB0 as backbone
'''
efficientnet, feature_map_info = get_efficientnet_backbone_info(inputs, level=level)
print('backbone layers number: {}'.format(len(efficientnet.layers)))
f1 = efficientnet.get_layer('top_activation').output
f2 = efficientnet.get_layer('block6a_expand_activation').output
f1_channel_num = feature_map_info['f1_channel_num']
f2_channel_num = feature_map_info['f2_channel_num']
y1, y2 = tiny_yolo3_predictions((f1, f2), (f1_channel_num, f2_channel_num), num_anchors, num_classes)
return Model(inputs, [y1,y2])
def tiny_yolo3_resnet50v2_body(inputs, num_anchors, num_classes):
'''Create Tiny YOLO_v3 ResNet50V2 model CNN body in keras.'''
resnet50v2 = ResNet50V2(input_tensor=inputs, weights='imagenet', include_top=False)
print('backbone layers number: {}'.format(len(resnet50v2.layers)))
# input: 416 x 416 x 3
# post_relu: 13 x 13 x 2048
# conv4_block5_out: 26 x 26 x 1024
# conv3_block3_out: 52 x 52 x 512
# f1 :13 x 13 x 2048
f1 = resnet50v2.get_layer('post_relu').output
# f2: 26 x 26 x 1024
f2 = resnet50v2.get_layer('conv4_block5_out').output
f1_channel_num = 1024
f2_channel_num = 512
y1, y2 = tiny_yolo3_predictions((f1, f2), (f1_channel_num, f2_channel_num), num_anchors, num_classes)
return Model(inputs, [y1,y2])
