Environment friendly Face Recognition on Edge Gadgets

Introduction

GhostFaceNets is a revolutionary facial recognition expertise that makes use of inexpensive operations with out compromising accuracy. Impressed by attention-based fashions, it revolutionizes facial recognition expertise. This weblog publish explores GhostFaceNets by means of charming visuals and insightful illustrations, aiming to coach, encourage, and spark creativity. The journey isn’t just a weblog publish, however a singular exploration of the limitless prospects of GhostFaceNets. Be part of us on this thrilling journey to find the world of GhostFaceNets.

Studying Aims

• Comprehend the underlying challenges and motivations driving the event of light-weight FR fashions tailor-made for low computational gadgets (eg: edge).
• Articulate the indepth architectural components of GhostFaceNets, together with the Ghost modules, the DFC consideration department, and the precise diversifications launched to the spine GhostNets architectures.
• Focus on the benefits of GhostFaceNets in comparison with conventional face recognition fashions, by way of effectivity, accuracy, and computational complexity.
• Acknowledge the foremost contributions made by GhostFaceNets to the sector of face recognition and face verification, and picture its potential functions throughout totally different real-time eventualities.

This text was printed as part of the Information Science Blogathon.

Introduction of GhostFaceNets

In at present’s period of ubiquitous computing and the IOT, FR expertise performs an necessary position in numerous functions, together with seamless consumer authentication, personalised experiences, and stronger safety measures. Nevertheless, conventional facial recognition techniques consumes excessive computational assets, rendering them unsuitable for deployment on low computation gadgets with restricted assets. That is the place GhostFaceNets comes into play, that guarantees to revolutionize how we strategy and implement facial recognition expertise.

Evolution of Light-weight Face Recognition Fashions

Because the demand for edge computing and real-time functions soared, the necessity for environment friendly and light-weight fashions turned paramount. Researchers and engineers alike sought to strike a fragile steadiness between mannequin complexity and efficiency, giving rise to a plethora of light-weight architectures tailor-made for particular duties, together with face recognition.

Deep studying algorithms like Convolutional Neural Networks (CNNs) have revolutionized face recognition analysis, enhancing accuracy in comparison with conventional strategies. Nevertheless, these fashions typically battle to steadiness efficiency and complexity, particularly for real-world functions and resource-constrained gadgets. The Labeled Faces within the Wild dataset is the gold commonplace for evaluating new FR fashions, with Mild CNN architectures decreasing parameters and computational complexity. Regardless of these developments, essentially the most correct reported efficiency on LFW is 99.33%.

ShiftFaceNet launched a “Shift” operation to scale back the variety of parameters in picture classification fashions, leading to a 2-degree accuracy drop. Different fashions constructed upon picture classification backbones, equivalent to MobileFaceNets, ShuffleFaceNet, VarGFaceNet, and MixFaceNets, have proven improved trade-offs between efficiency and complexity. MobileFaceNets achieved 99.55% LFW accuracy with 1M parameters, whereas ShuffleFaceNet achieved 99.67% LFW accuracy with 2.6M parameters and 557.5 MFLOPs.

VarGFaceNet leveraged VarGNet and achieved 99.85% LFW accuracy with 5M parameters and 1.022 GFLOPs. MixFaceNets achieved 99.68% LFW accuracy with 3.95M parameters and 626.1 MFLOPs. Different notable fashions embrace AirFace, QuantFace, and PocketNets, which have achieved 99.27% LFW accuracy with 1 GFLOPs, 99.43% LFW accuracy with 1.1M parameters, and 99.58% LFW accuracy with 0.925M parameters and 587.11 MFLOPs.

Understanding GhostFaceNets Structure

Constructing upon the environment friendly GhostNets architectures (GhostNetV1 and GhostNetV2), the authors suggest GhostFaceNets, a brand new set of light-weight architectures tailor-made for face recognition and face verification. A number of key modifications have been made:

• The World Common Pooling (GAP) layer, pointwise convolution layer (1×1 convolution), and Absolutely Linked (FC) layer have been changed with a modified World Depthwise Convolution (GDC) recognition head to generate discriminative function vectors.
• The ReLU activation operate utilized in GhostNets was changed with PReLU, which alleviates the vanishing gradient drawback and improves efficiency.
• The standard Absolutely Linked layers within the Squeeze-and-Excitation (SE) modules have been changed with convolution layers to enhance the discriminative energy of GhostFaceNets.
• The ArcFace loss operate was employed for coaching, to implement intra-class compactness, inter-class discrepancy, and improves the discriminative energy of discovered options. To undergo Arcface loss operate please consult with my earlier weblog –  click on right here

The authors designed a set of GhostFaceNets fashions by various the coaching dataset, the width of the GhostNets architectures, and the stride of the primary convolution layer (stem). The ensuing fashions outperform most light-weight SOTA fashions on totally different benchmarks, as mentioned in subsequent sections.

A. GhostNetV1 and Ghost Modules (Function Map Sample Redundancy)

GhostNetV1, the spine structure of GhostFaceNets, employs a novel idea referred to as Ghost modules to generate a sure share (denoted as x%) of the function maps, whereas the remaining function maps are generated utilizing a low-cost linear operation referred to as as depthwise convolution (DWConv).

In a conventional convolutional layer, a 2D filter (kernel) is utilized to a 2D channel of the enter tensor to generate a 2D channel of the output tensor, immediately producing a tensor of function maps with C’ channels from an enter tensor of C channels. Nevertheless, Ghost modules take a distinct strategy.

The Ghost module generates the primary x% of the output tensor channels utilizing a sequential block of three layers: regular convolution, batch normalization, and a nonlinear activation operate (default: ReLU). The output is then despatched to a second block with depthwise convolution, batch normalization, and ReLU, and the output tensor is accomplished by stacking the 2 blocks.

As proven in Determine 1, there are clearly comparable and redundant function map pairs (ghosts) that may be generated utilizing linear operations, decreasing computational complexity with out reducing efficiency. The authors of GhostNetV1 exploit this statement by producing these comparable and redundant options utilizing low-cost operations, fairly than discarding them.

By using Ghost modules, GhostNetV1 can successfully generate the identical variety of function maps as an convolutional layer, with important discount within the variety of parameters and FLOPs. This permits Ghost modules to be simply built-in into present neural community architectures to scale back computational complexity.

Implementation with Python Code

Under code is from ghost_model.py module from backbones folder

import tensorflow as tf
from tensorflow import keras
from tensorflow.keras import backend as Ok
from tensorflow.keras.fashions import Mannequin
from tensorflow.keras.layers import (
    Activation,
    Add,
    BatchNormalization,
    Concatenate,
    Conv2D,
    DepthwiseConv2D,
    GlobalAveragePooling2D,
    Enter,
    PReLU,
    Reshape,
    Multiply,
)
import math

CONV_KERNEL_INITIALIZER = keras.initializers.VarianceScaling(scale=2.0, mode="fan_out", distribution="truncated_normal")

def _make_divisible(v, divisor=4, min_value=None):
    """
    This operate is taken from the unique tf repo.
    It ensures that each one layers have a channel quantity that's divisible by 8
    It may be seen right here:
    https://github.com/tensorflow/fashions/blob/grasp/analysis/slim/nets/mobilenet/mobilenet.py
    """
    if min_value is None:
        min_value = divisor
    new_v = max(min_value, int(v + divisor / 2) // divisor * divisor)
    if new_v < 0.9 * v:
        new_v += divisor
    return new_v


def activation(inputs):
    return Activation("relu")(inputs)


def se_module(inputs, se_ratio=0.25):
    #get the channel axis
    channel_axis = 1 if Ok.image_data_format() == "channels_first" else -1
    #filters = channel axis form
    filters = inputs.form[channel_axis]

    discount = _make_divisible(filters * se_ratio)

    #from None x H x W x C to None x C
    se = GlobalAveragePooling2D()(inputs)

    #Reshape None x C to None 1 x 1 x C
    se = Reshape((1, 1, filters))(se)

    #Squeeze through the use of C*se_ratio. The dimensions shall be 1 x 1 x C*se_ratio 
    se = Conv2D(discount, kernel_size=1, use_bias=True, kernel_initializer=CONV_KERNEL_INITIALIZER)(se)
    # se = PReLU(shared_axes=[1, 2])(se)
    se = Activation("relu")(se)

    #Excitation utilizing C filters. The dimensions shall be 1 x 1 x C
    se = Conv2D(filters, kernel_size=1, use_bias=True, kernel_initializer=CONV_KERNEL_INITIALIZER)(se)
    se = Activation("hard_sigmoid")(se)
    
    return Multiply()([inputs, se])


def ghost_module(inputs, out, convkernel=1, dwkernel=3, add_activation=True):
    # conv_out_channel = math.ceil(out * 1.0 / 2)
    conv_out_channel = out // 2
    # tf.print("[ghost_module] out:", out, "conv_out_channel:", conv_out_channel)
    cc = Conv2D(conv_out_channel, convkernel, use_bias=False, strides=(1, 1), padding="identical", kernel_initializer=CONV_KERNEL_INITIALIZER)(
        inputs
    )  # padding=kernel_size//2
    cc = BatchNormalization(axis=-1)(cc)
    if add_activation:
        cc = activation(cc)

    channel = int(out - conv_out_channel)
    nn = DepthwiseConv2D(dwkernel, 1, padding="identical", use_bias=False, depthwise_initializer=CONV_KERNEL_INITIALIZER)(cc)  # padding=dw_size//2
    nn = BatchNormalization(axis=-1)(nn)
    if add_activation:
        nn = activation(nn)
    return Concatenate()([cc, nn])


def ghost_bottleneck(inputs, dwkernel, strides, exp, out, se_ratio=0, shortcut=True):
    nn = ghost_module(inputs, exp, add_activation=True)  # ghost1 = GhostModule(in_chs, exp, relu=True)
    if strides > 1:
        # Additional depth conv if strides increased than 1
        nn = DepthwiseConv2D(dwkernel, strides, padding="identical", use_bias=False, depthwise_initializer=CONV_KERNEL_INITIALIZER)(nn)
        nn = BatchNormalization(axis=-1)(nn)
        # nn = Activation('relu')(nn)

    if se_ratio > 0:
        # Squeeze and excite
        nn = se_module(nn, se_ratio)  # se = SqueezeExcite(exp, se_ratio=se_ratio)

    # Level-wise linear projection
    nn = ghost_module(nn, out, add_activation=False)  # ghost2 = GhostModule(exp, out, relu=False)
    # nn = BatchNormalization(axis=-1)(nn)

    if shortcut:
        xx = DepthwiseConv2D(dwkernel, strides, padding="identical", use_bias=False, depthwise_initializer=CONV_KERNEL_INITIALIZER)(
            inputs
        )  # padding=(dw_kernel_size-1)//2
        xx = BatchNormalization(axis=-1)(xx)
        xx = Conv2D(out, (1, 1), strides=(1, 1), padding="legitimate", use_bias=False, kernel_initializer=CONV_KERNEL_INITIALIZER)(xx)  # padding=0
        xx = BatchNormalization(axis=-1)(xx)
    else:
        xx = inputs
    return Add()([xx, nn])

#1.3 is the width of the GhostNet as within the paper (Desk 7)
def GhostNet(input_shape=(224, 224, 3), include_top=True, lessons=0, width=1.3, strides=2, identify="GhostNet"):
    inputs = Enter(form=input_shape)
    out_channel = _make_divisible(16 * width, 4)
    nn = Conv2D(out_channel, (3, 3), strides=strides, padding="identical", use_bias=False, kernel_initializer=CONV_KERNEL_INITIALIZER)(inputs)  # padding=1
    nn = BatchNormalization(axis=-1)(nn)
    nn = activation(nn)
    dwkernels = [3, 3, 3, 5, 5, 3, 3, 3, 3, 3, 3, 5, 5, 5, 5, 5]
    exps = [16, 48, 72, 72, 120, 240, 200, 184, 184, 480, 672, 672, 960, 960, 960, 512]
    outs = [16, 24, 24, 40, 40, 80, 80, 80, 80, 112, 112, 160, 160, 160, 160, 160]
    use_ses = [0, 0, 0, 0.25, 0.25, 0, 0, 0, 0, 0.25, 0.25, 0.25, 0, 0.25, 0, 0.25]
    strides = [1, 2, 1, 2, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1]


    pre_out = out_channel
    for dwk, stride, exp, out, se in zip(dwkernels, strides, exps, outs, use_ses):
        
        out = _make_divisible(out * width, 4) # [ 20 32 32 52 52 104 104 104 104 144 144 208 208 208 208 208 ]
        exp = _make_divisible(exp * width, 4) # [ 20 64 92 92 156 312 260 240 240 624 872 872 1248 1248 1248 664 ]
        shortcut = False if out == pre_out and stride == 1 else True
        nn = ghost_bottleneck(nn, dwk, stride, exp, out, se, shortcut)
        pre_out = out # [ 20 32 32 52 52 104 104 104 104 144 144 208 208 208 208 208 ]

    out = _make_divisible(exps[-1] * width, 4) #664
    nn = Conv2D(out, (1, 1), strides=(1, 1), padding="legitimate", use_bias=False, kernel_initializer=CONV_KERNEL_INITIALIZER)(nn)  # padding=0
    nn = BatchNormalization(axis=-1)(nn)
    nn = activation(nn)

    if include_top:
        nn = GlobalAveragePooling2D()(nn)
        nn = Reshape((1, 1, int(nn.form[1])))(nn)
        nn = Conv2D(1280, (1, 1), strides=(1, 1), padding="identical", use_bias=False, kernel_initializer=CONV_KERNEL_INITIALIZER)(nn)
        nn = BatchNormalization(axis=-1)(nn)
        nn = activation(nn)
        nn = Conv2D(lessons, (1, 1), strides=(1, 1), padding="identical", use_bias=False, kernel_initializer=CONV_KERNEL_INITIALIZER)(nn)
        nn = Ok.squeeze(nn, 1)
        nn = Activation("softmax")(nn)

    return Mannequin(inputs=inputs, outputs=nn, identify=identify)

B. GhostNetV2

GhostNetV2 introduces important enhancements to the Ghost module of GhostNetV1, aiming to seize long-range dependencies extra successfully. The important thing innovation is the incorporation of a novel attention-based layer referred to as the DFC consideration department, designed to generate consideration maps with international receptive fields utilizing convolutions. Not like conventional self-attention layers, the DFC consideration department achieves excessive effectivity whereas capturing dependencies between pixels throughout totally different spatial places. This effectivity is essential for {hardware} compatibility and inference velocity, as many prior consideration modules relied on computationally intensive tensor operations.

GhostNetV2’s structure encompasses a new bottleneck construction, permitting the Ghost module and DFC consideration department to function in parallel. It gathers data from numerous viewpoints and aggregating it into the ultimate output. This feature-wise product ensures complete protection of enter information throughout numerous patches.

The DFC consideration department consists of 5 operations: downsampling, convolution, horizontal and vertical absolutely related (FC) layers, and sigmoid activation(Refer the above picture). To mitigate computational overhead, we make the most of native common pooling for downsampling and bilinear interpolation for upsampling. Decomposing the FC layer into horizontal and vertical elements reduces complexity whereas capturing long-range dependencies alongside each dimensions.

Total, GhostNetV2 represents a big development in attention-based fashions, providing improved effectivity and effectiveness in capturing long-range dependencies. Visible aids equivalent to diagrams illustrating the structure and operations of the DFC consideration department can enhance understanding and engagement for readers. Place these diagrams strategically inside the textual content to enrich the reasons and facilitate comprehension.

Implementation with Python Code

Under code is from ghostv2.py module from backbones folder

!pip set up keras_cv_attention_models
import tensorflow as tf
from tensorflow import keras
from keras_cv_attention_models.attention_layers import (
    activation_by_name,
    batchnorm_with_activation,
    conv2d_no_bias,
    depthwise_conv2d_no_bias,
    make_divisible,
    se_module,
    add_pre_post_process,
)
from keras_cv_attention_models.download_and_load import reload_model_weights

PRETRAINED_DICT = {
    "ghostnetv2_1x": {"imagenet": "4f28597d5f72731ed4ef4f69ec9c1799"},
    "ghostnet_1x": {"imagenet": "df1de036084541c5b8bd36b179c74577"},
}


def ghost_module(inputs, out_channel, activation="relu", identify=""):
    ratio = 2
    hidden_channel = int(tf.math.ceil(float(out_channel) / ratio))
    primary_conv = conv2d_no_bias(inputs, hidden_channel, identify=identify + "prim_")
    primary_conv = batchnorm_with_activation(primary_conv, activation=activation, identify=identify + "prim_")
    cheap_conv = depthwise_conv2d_no_bias(primary_conv, kernel_size=3, padding="SAME", identify=identify + "cheap_")
    cheap_conv = batchnorm_with_activation(cheap_conv, activation=activation, identify=identify + "cheap_")
    return keras.layers.Concatenate()([primary_conv, cheap_conv])


def ghost_module_multiply(inputs, out_channel, activation="relu", identify=""):
    nn = ghost_module(inputs, out_channel, activation=activation, identify=identify)

    # shortcut = keras.layers.AvgPool2D(pool_size=2, strides=2, padding="SAME")(inputs)
    shortcut = keras.layers.AvgPool2D(pool_size=2, strides=2)(inputs)
    shortcut = conv2d_no_bias(shortcut, out_channel, identify=identify + "short_1_")
    shortcut = batchnorm_with_activation(shortcut, activation=None, identify=identify + "short_1_")
    shortcut = depthwise_conv2d_no_bias(shortcut, (1, 5), padding="SAME", identify=identify + "short_2_")
    shortcut = batchnorm_with_activation(shortcut, activation=None, identify=identify + "short_2_")
    shortcut = depthwise_conv2d_no_bias(shortcut, (5, 1), padding="SAME", identify=identify + "short_3_")
    shortcut = batchnorm_with_activation(shortcut, activation=None, identify=identify + "short_3_")
    shortcut = activation_by_name(shortcut, "sigmoid", identify=identify + "short_")
    shortcut = tf.picture.resize(shortcut, tf.form(inputs)[1:-1], antialias=False, methodology="bilinear")
    return keras.layers.Multiply()([shortcut, nn])


def ghost_bottleneck(
    inputs, out_channel, first_ghost_channel, kernel_size=3, strides=1, se_ratio=0, shortcut=True, use_ghost_module_multiply=False, activation="relu", identify=""
):
    if shortcut:
        shortcut = depthwise_conv2d_no_bias(inputs, kernel_size, strides, padding="identical", identify=identify + "short_1_")
        shortcut = batchnorm_with_activation(shortcut, activation=None, identify=identify + "short_1_")
        shortcut = conv2d_no_bias(shortcut, out_channel, identify=identify + "short_2_")
        shortcut = batchnorm_with_activation(shortcut, activation=None, identify=identify + "short_2_")
    else:
        shortcut = inputs

    if use_ghost_module_multiply:
        nn = ghost_module_multiply(inputs, first_ghost_channel, activation=activation, identify=identify + "ghost_1_")
    else:
        nn = ghost_module(inputs, first_ghost_channel, activation=activation, identify=identify + "ghost_1_")

    if strides > 1:
        nn = depthwise_conv2d_no_bias(nn, kernel_size, strides, padding="identical", identify=identify + "down_")
        nn = batchnorm_with_activation(nn, activation=None, identify=identify + "down_")

    if se_ratio > 0:
        nn = se_module(nn, se_ratio=se_ratio, divisor=4, activation=("relu", "hard_sigmoid_torch"), identify=identify + "se_")

    nn = ghost_module(nn, out_channel, activation=None, identify=identify + "ghost_2_")
    return keras.layers.Add(identify=identify + "output")([shortcut, nn])


def GhostNetV2(
    stem_width=16,
    stem_strides=2,
    width_mul=1.0,
    num_ghost_module_v1_stacks=2,  # num of `ghost_module` stcks on the top, others are `ghost_module_multiply`, set `-1` for all utilizing `ghost_module`
    input_shape=(224, 224, 3),
    num_classes=1000,
    activation="relu",
    classifier_activation="softmax",
    dropout=0,
    pretrained=None,
    model_name="ghostnetv2",
    kwargs=None,
):
    inputs = keras.layers.Enter(input_shape)
    stem_width = make_divisible(stem_width * width_mul, divisor=4)
    nn = conv2d_no_bias(inputs, stem_width, 3, strides=stem_strides, padding="identical", identify="stem_")
    nn = batchnorm_with_activation(nn, activation=activation, identify="stem_")

    """ phases """
    kernel_sizes = [3, 3, 3, 5, 5, 3, 3, 3, 3, 3, 3, 5, 5, 5, 5, 5]
    first_ghost_channels = [16, 48, 72, 72, 120, 240, 200, 184, 184, 480, 672, 672, 960, 960, 960, 960]
    out_channels = [16, 24, 24, 40, 40, 80, 80, 80, 80, 112, 112, 160, 160, 160, 160, 160]
    se_ratios = [0, 0, 0, 0.25, 0.25, 0, 0, 0, 0, 0.25, 0.25, 0.25, 0, 0.25, 0, 0.25]
    strides = [1, 2, 1, 2, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1]

    for stack_id, (kernel, stride, first_ghost, out_channel, se_ratio) in enumerate(zip(kernel_sizes, strides, first_ghost_channels, out_channels, se_ratios)):
        stack_name = "stack{}_".format(stack_id + 1)
        out_channel = make_divisible(out_channel * width_mul, 4)
        first_ghost_channel = make_divisible(first_ghost * width_mul, 4)
        shortcut = False if out_channel == nn.form[-1] and stride == 1 else True
        use_ghost_module_multiply = True if num_ghost_module_v1_stacks >= 0 and stack_id >= num_ghost_module_v1_stacks else False
        nn = ghost_bottleneck(
            nn, out_channel, first_ghost_channel, kernel, stride, se_ratio, shortcut, use_ghost_module_multiply, activation=activation, identify=stack_name
        )

    nn = conv2d_no_bias(nn, make_divisible(first_ghost_channels[-1] * width_mul, 4), 1, strides=1, identify="pre_")
    nn = batchnorm_with_activation(nn, activation=activation, identify="pre_")

    if num_classes > 0:
        nn = keras.layers.GlobalAveragePooling2D(keepdims=True)(nn)
        nn = conv2d_no_bias(nn, 1280, 1, strides=1, use_bias=True, identify="features_")
        nn = activation_by_name(nn, activation, identify="features_")
        nn = keras.layers.Flatten()(nn)
        if dropout > 0 and dropout < 1:
            nn = keras.layers.Dropout(dropout)(nn)
        nn = keras.layers.Dense(num_classes, dtype="float32", activation=classifier_activation, identify="head")(nn)

    mannequin = keras.fashions.Mannequin(inputs, nn, identify=model_name)
    add_pre_post_process(mannequin, rescale_mode="torch")
    reload_model_weights(mannequin, PRETRAINED_DICT, "ghostnetv2", pretrained)
    return mannequin


def GhostNetV2_1X(input_shape=(224, 224, 3), num_classes=1000, activation="relu", classifier_activation="softmax", pretrained="imagenet", **kwargs):
    return GhostNetV2(**locals(), model_name="ghostnetv2_1x", **kwargs)


""" GhostNet V1 """


def GhostNet(
    stem_width=16,
    stem_strides=2,
    width_mul=1.0,
    num_ghost_module_v1_stacks=-1,  # num of `ghost_module` stcks on the top, others are `ghost_module_multiply`, set `-1` for all utilizing `ghost_module`
    input_shape=(224, 224, 3),
    num_classes=1000,
    activation="relu",
    classifier_activation="softmax",
    dropout=0,
    pretrained=None,
    model_name="ghostnet",
    kwargs=None,
):
    return GhostNetV2(**locals())


def GhostNet_1X(input_shape=(224, 224, 3), num_classes=1000, activation="relu", classifier_activation="softmax", pretrained="imagenet", **kwargs):
    return GhostNet(**locals(), model_name="ghostnet_1x", **kwargs)

The Ghost module in GhostNetV1 incorporates the DFC consideration department, whereas GhostNetV2 employs it.

C. GhostFaceNets Structure

Constructing upon the GhostNetV1 structure, the authors of GhostFaceNets made a number of key modifications to tailor the mannequin for face recognition and face verification duties.

GhostFaceNets are a big development in light-weight face recognition and face verification fashions, incorporating key modifications to enhance efficiency and effectivity. One notable enchancment is using a modified Ghost Depthwise Convolution layer, changing the World Common Pooling layer in picture classification fashions. This permits the community to study various weights for various function map items, enhancing discriminative energy and efficiency.

GhostFaceNets use the Parametric Rectified Linear Unit (PReLU) activation operate as an alternative of ReLU, enabling unfavorable activations for complicated nonlinear capabilities studying, bettering community efficiency in face recognition duties. Convolutions change standard FC layers in Squeeze-and-Excitation modules.

GhostFaceNets introduce a novel consideration mechanism inside SE modules, bettering channel interdependencies at minimal computational value. This mechanism adjusts channel weight to prioritize necessary options and reduces sensitivity to much less related ones, providing flexibility in downsampling methods.

GhostFaceNets variants design with configurable backbones, width multipliers, and stride parameters for generalization and flexibility. Experiments with hyperparameters and coaching datasets, together with MS1MV2 and MS1MV3, optimize efficiency utilizing ArcFace coaching loss operate, minimizing intra-class hole and enhancing inter-class differentiation.

Necessities to Run Python Code

Please use the under necessities to run the code, python model is 3.9.12: 

• TensorFlow==2.8.0
• Keras==2.8.0
• keras_cv_attention_models
• glob2
• pandas
• tqdm
• scikit-image

Implementation with Python Code

Under code is from module from fundamental folder.

import tensorflow as tf
from tensorflow import keras
import tensorflow.keras.backend as Ok


def __init_model_from_name__(identify, input_shape=(112, 112, 3), weights="imagenet", **kwargs):
    name_lower = identify.decrease()
    """ Fundamental mannequin """
    if name_lower == "ghostnetv1":
        from backbones import ghost_model

        xx = ghost_model.GhostNet(input_shape=input_shape, include_top=False, width=1, **kwargs)
    
    elif name_lower == "ghostnetv2":
        from backbones import ghostv2

        xx = ghostv2.GhostNetV2(stem_width=16,
                                stem_strides=1,
                                width_mul=1.3,
                                num_ghost_module_v1_stacks=2,  # num of `ghost_module` stcks on the top, others are `ghost_module_multiply`, set `-1` for all utilizing `ghost_module`
                                input_shape=(112, 112, 3),
                                num_classes=0,
                                activation="prelu",
                                classifier_activation=None,
                                dropout=0,
                                pretrained=None,
                                model_name="ghostnetv2",
                                **kwargs)

    else:
        return None
    xx.trainable = True
    return xx


def buildin_models(
    stem_model,
    dropout=1,
    emb_shape=512,
    input_shape=(112, 112, 3),
    output_layer="GDC",
    bn_momentum=0.99,
    bn_epsilon=0.001,
    add_pointwise_conv=False,
    pointwise_conv_act="relu",
    use_bias=False,
    scale=True,
    weights="imagenet",
    **kwargs
):
    if isinstance(stem_model, str):
        xx = __init_model_from_name__(stem_model, input_shape, weights, **kwargs)
        identify = stem_model
    else:
        identify = stem_model.identify
        xx = stem_model

    if bn_momentum != 0.99 or bn_epsilon != 0.001:
        print(">>>> Change BatchNormalization momentum and epsilon default worth.")
        for ii in xx.layers:
            if isinstance(ii, keras.layers.BatchNormalization):
                ii.momentum, ii.epsilon = bn_momentum, bn_epsilon
        xx = keras.fashions.clone_model(xx)

    inputs = xx.inputs[0]
    nn = xx.outputs[0]

    if add_pointwise_conv:  # Mannequin utilizing `pointwise_conv + GDC` / `pointwise_conv + E` is smaller than `E`
        filters = nn.form[-1] // 2 if add_pointwise_conv == -1 else 512  # Compitable with earlier fashions...
        nn = keras.layers.Conv2D(filters, 1, use_bias=False, padding="legitimate", identify="pw_conv")(nn)
        nn = keras.layers.BatchNormalization(momentum=bn_momentum, epsilon=bn_epsilon, identify="pw_bn")(nn)
        if pointwise_conv_act.decrease() == "prelu":
            nn = keras.layers.PReLU(shared_axes=[1, 2], identify="pw_" + pointwise_conv_act)(nn)
        else:
            nn = keras.layers.Activation(pointwise_conv_act, identify="pw_" + pointwise_conv_act)(nn)
    
    """ GDC """
    nn = keras.layers.DepthwiseConv2D(nn.form[1], use_bias=False, identify="GDC_dw")(nn)
    nn = keras.layers.BatchNormalization(momentum=bn_momentum, epsilon=bn_epsilon, identify="GDC_batchnorm")(nn)
    if dropout > 0 and dropout < 1:
        nn = keras.layers.Dropout(dropout)(nn)
    nn = keras.layers.Conv2D(emb_shape, 1, use_bias=use_bias, kernel_initializer="glorot_normal", identify="GDC_conv")(nn)
    nn = keras.layers.Flatten(identify="GDC_flatten")(nn)
    embedding = keras.layers.BatchNormalization(momentum=bn_momentum, epsilon=bn_epsilon, scale=scale, identify="pre_embedding")(nn)
    embedding_fp32 = keras.layers.Activation("linear", dtype="float32", identify="embedding")(embedding)

    basic_model = keras.fashions.Mannequin(inputs, embedding_fp32, identify=xx.identify)
    return basic_model


def add_l2_regularizer_2_model(mannequin, weight_decay, custom_objects={}, apply_to_batch_normal=False, apply_to_bias=False):
    # https://github.com/keras-team/keras/points/2717#issuecomment-456254176
    if 0:
        regularizers_type = {}
        for layer in mannequin.layers:
            rrs = [kk for kk in layer.__dict__.keys() if "regularizer" in kk and not kk.startswith("_")]
            if len(rrs) != 0:
                # print(layer.identify, layer.__class__.__name__, rrs)
                if layer.__class__.__name__ not in regularizers_type:
                    regularizers_type[layer.__class__.__name__] = rrs
        print(regularizers_type)

    for layer in mannequin.layers:
        attrs = []
        if isinstance(layer, keras.layers.Dense) or isinstance(layer, keras.layers.Conv2D):
            # print(">>>> Dense or Conv2D", layer.identify, "use_bias:", layer.use_bias)
            attrs = ["kernel_regularizer"]
            if apply_to_bias and layer.use_bias:
                attrs.append("bias_regularizer")
        elif isinstance(layer, keras.layers.DepthwiseConv2D):
            # print(">>>> DepthwiseConv2D", layer.identify, "use_bias:", layer.use_bias)
            attrs = ["depthwise_regularizer"]
            if apply_to_bias and layer.use_bias:
                attrs.append("bias_regularizer")
        elif isinstance(layer, keras.layers.SeparableConv2D):
            attrs = ["pointwise_regularizer", "depthwise_regularizer"]
            if apply_to_bias and layer.use_bias:
                attrs.append("bias_regularizer")
        elif apply_to_batch_normal and isinstance(layer, keras.layers.BatchNormalization):
            if layer.heart:
                attrs.append("beta_regularizer")
            if layer.scale:
                attrs.append("gamma_regularizer")
        elif apply_to_batch_normal and isinstance(layer, keras.layers.PReLU):
            attrs = ["alpha_regularizer"]

        for attr in attrs:
            if hasattr(layer, attr) and layer.trainable:
                setattr(layer, attr, keras.regularizers.L2(weight_decay / 2))
    return keras.fashions.clone_model(mannequin)


def replace_ReLU_with_PReLU(mannequin, target_activation="PReLU", **kwargs):
    from tensorflow.keras.layers import ReLU, PReLU, Activation

    def convert_ReLU(layer):
        # print(layer.identify)
        if isinstance(layer, ReLU) or (isinstance(layer, Activation) and layer.activation == keras.activations.relu):
            if target_activation == "PReLU":
                layer_name = layer.identify.change("_relu", "_prelu")
                print(">>>> Convert ReLU:", layer.identify, "-->", layer_name)
                # Default preliminary worth in mxnet and pytorch is 0.25
                return PReLU(shared_axes=[1, 2], alpha_initializer=tf.initializers.Fixed(0.25), identify=layer_name, **kwargs)
            elif isinstance(target_activation, str):
                layer_name = layer.identify.change("_relu", "_" + target_activation)
                print(">>>> Convert ReLU:", layer.identify, "-->", layer_name)
                return Activation(activation=target_activation, identify=layer_name, **kwargs)
            else:
                act_class_name = target_activation.__name__
                layer_name = layer.identify.change("_relu", "_" + act_class_name)
                print(">>>> Convert ReLU:", layer.identify, "-->", layer_name)
                return target_activation(**kwargs)
        return layer

    input_tensors = keras.layers.Enter(mannequin.input_shape[1:])
    return keras.fashions.clone_model(mannequin, input_tensors=input_tensors, clone_function=convert_ReLU)


def convert_to_mixed_float16(mannequin, convert_batch_norm=False):
    coverage = keras.mixed_precision.Coverage("mixed_float16")
    policy_config = keras.utils.serialize_keras_object(coverage)
    from tensorflow.keras.layers import InputLayer, Activation
    from tensorflow.keras.activations import linear, softmax

    def do_convert_to_mixed_float16(layer):
        if not convert_batch_norm and isinstance(layer, keras.layers.BatchNormalization):
            return layer
        if isinstance(layer, InputLayer):
            return layer
        if isinstance(layer, Activation) and layer.activation == softmax:
            return layer
        if isinstance(layer, Activation) and layer.activation == linear:
            return layer

        aa = layer.get_config()
        aa.replace({"dtype": policy_config})
        bb = layer.__class__.from_config(aa)
        bb.construct(layer.input_shape)
        bb.set_weights(layer.get_weights())
        return bb

    input_tensors = keras.layers.Enter(mannequin.input_shape[1:])
    mm = keras.fashions.clone_model(mannequin, input_tensors=input_tensors, clone_function=do_convert_to_mixed_float16)
    if mannequin.constructed:
        mm.compile(optimizer=mannequin.optimizer, loss=mannequin.compiled_loss, metrics=mannequin.compiled_metrics)
        # mm.optimizer, mm.compiled_loss, mm.compiled_metrics = mannequin.optimizer, mannequin.compiled_loss, mannequin.compiled_metrics
        # mm.constructed = True
    return mm


def convert_mixed_float16_to_float32(mannequin):
    from tensorflow.keras.layers import InputLayer, Activation
    from tensorflow.keras.activations import linear

    def do_convert_to_mixed_float16(layer):
        if not isinstance(layer, InputLayer) and never (isinstance(layer, Activation) and layer.activation == linear):
            aa = layer.get_config()
            aa.replace({"dtype": "float32"})
            bb = layer.__class__.from_config(aa)
            bb.construct(layer.input_shape)
            bb.set_weights(layer.get_weights())
            return bb
        return layer

    input_tensors = keras.layers.Enter(mannequin.input_shape[1:])
    return keras.fashions.clone_model(mannequin, input_tensors=input_tensors, clone_function=do_convert_to_mixed_float16)


def convert_to_batch_renorm(mannequin):
    def do_convert_to_batch_renorm(layer):
        if isinstance(layer, keras.layers.BatchNormalization):
            aa = layer.get_config()
            aa.replace({"renorm": True, "renorm_clipping": {}, "renorm_momentum": aa["momentum"]})
            bb = layer.__class__.from_config(aa)
            bb.construct(layer.input_shape)
            bb.set_weights(layer.get_weights() + bb.get_weights()[-3:])
            return bb
        return layer

    input_tensors = keras.layers.Enter(mannequin.input_shape[1:])
    return keras.fashions.clone_model(mannequin, input_tensors=input_tensors, clone_function=do_convert_to_batch_renorm)

Key Options and Advantages of GhostFaceNets

• Light-weight and Environment friendly: GhostFaceNets leverage environment friendly GhostNet architectures and modules, very best for real-time, cellular, and embedded deployment.
• Correct and Strong: They ship correct and sturdy face recognition and verification efficiency, outperforming many state-of-the-art fashions on totally different benchmarks.
• Modified GDC Recognition Head: The modified GDC recognition head generates discriminative function vectors, enhancing the mannequin’s efficiency.
• PReLU Activation: Using PReLU because the nonlinear activation operate alleviates the vanishing gradient drawback. It additionally improves efficiency in comparison with ReLU.
• Consideration-based Enhancements: Incorporating the DFC consideration department in GhostNetV2 enhances efficiency by capturing long-range dependencies and contextual data.

Experimental Validation and Efficiency Metrics

The authors of GhostFaceNets rigorously examined the mannequin’s efficiency on totally different benchmark datasets, together with the widely-acclaimed Labeled Faces within the Wild (LFW) and YouTube Faces (YTF) datasets. The outcomes have been nice, with GhostFaceNets reaching state-of-the-art efficiency whereas sustaining a majorly smaller mannequin measurement and decrease computational complexity in comparison with present face recognition fashions.

Purposes and Future Prospects

GhostFaceNets opens up a world of prospects like:

• Face recognition functions on edge gadgets.
• From safe consumer authentication on cellular gadgets to clever surveillance techniques.
• The potential functions are huge and numerous.

Because the demand for edge computing and real-time face recognition continues to develop, GhostFaceNets represents a significant step ahead within the area, paving the best way for future developments and improvements. Researchers and engineers can construct upon this groundbreaking work, exploring new architectures, optimization strategies, and functions to additional push the boundaries of environment friendly and correct face recognition.

Conclusion

GhostFaceNets is a groundbreaking engineering innovation that makes use of deep studying strategies and edge computing to create light-weight face recognition fashions. It makes use of ghost modules to ship correct and sturdy recognition capabilities whereas sustaining a computationally environment friendly footprint. Because the world embraces ubiquitous computing and the Web of Issues, GhostFaceNets is a beacon of innovation. Integrating face recognition expertise into day by day life to enhance experiences and safety with out sacrificing efficiency or effectivity.

Key Takeaways

• GhostFaceNets is a groundbreaking development in light-weight face recognition. It balances effectivity and accuracy, making it very best for deploying facial recognition expertise on gadgets with restricted computational assets.
• The structure enhances face recognition effectivity and effectiveness by incorporating Ghost modules, DFC consideration department, and PReLU activation. It additionally making certain accuracy with out compromising effectiveness.
• DFC consideration department in GhostNetV2 effectively captures long-range dependencies, enhancing contextual understanding with minimal computational burden.
• GhostFaceNets excel on benchmarks, with compact sizes and environment friendly computation, very best for real-world functions.

Steadily Requested Questions

References

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