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involution:大家一起内卷起来吧

involution:大家一起内卷起来吧

热心网友 时间:2025-07-18
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本文介绍用Layer方式搭建involution算子,以此魔改ResNet打造RedNet模型,已加入【Paddle-Image-Models】项目,含转换后的最新预训练参数,精度基本对齐。还展示了算子和模型的搭建代码、测试情况及精度验证结果,RedNet性能和效率优于ResNet等模型。

involution:大家一起内卷起来吧 - 游乐网

引入

真·内卷无处不在,现在神经网络也能内卷了这次项目就用 Layer 的方式搭建一下 involution 算子,并且使用这个算子参照论文所述魔改一下 ResNet 打造一个新模型 RedNet当然这个模型也已经添加到了 【Paddle-Image-Models】 项目中了,包含转换之后的最新预训练参数,精度基本对齐好让大家能够尽快在神经网络里面内卷起来

相关资料

论文:【Involution: Inverting the Inherence of Convolution for Visual Recognition】

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代码:【d-li14/involution】

论文概要

提出了一种新的神经网络算子(operator或op)称为 involution,它比 convolution 更轻量更高效,形式上比 self-attention 更加简洁,可以用在各种视觉任务的模型上取得精度和效率的双重提升。通过 involution 的结构设计,我们能够以统一的视角来理解经典的卷积操作和近来流行的自注意力操作。

算子和模型搭建

导入必要的包

In [1]
import paddleimport paddle.nn as nnfrom paddle.vision.models import resnet
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involution(内卷)

针对输入 feature map 的一个坐标点上的特征向量:先通过 (FC-BN-ReLU-FC) 和 reshape (channel-to-space) 变换展开成 kernel 的形状从而得到这个坐标点上对应的 involution kernel再和输入 feature map 上这个坐标点邻域的特征向量进行 Multiply-Add 得到最终输出的 feature mapinvolution 示意图如下:involution:大家一起内卷起来吧 - 游乐网            In [2]
class involution(nn.Layer):    def __init__(self,                 channels,                 kernel_size,                 stride):        super(involution, self).__init__()        self.kernel_size = kernel_size        self.stride = stride        self.channels = channels        reduction_ratio = 4        self.group_channels = 16        self.groups = self.channels // self.group_channels        self.conv1 = nn.Sequential(            ('conv', nn.Conv2D(                in_channels=channels,                out_channels=channels // reduction_ratio,                kernel_size=1,                bias_attr=False            )),            ('bn', nn.BatchNorm2D(channels // reduction_ratio)),            ('activate', nn.ReLU())        )        self.conv2 = nn.Sequential(            ('conv', nn.Conv2D(                in_channels=channels // reduction_ratio,                out_channels=kernel_size**2 * self.groups,                kernel_size=1,                stride=1))        )        if stride > 1:            self.avgpool = nn.AvgPool2D(stride, stride)    def forward(self, x):        weight = self.conv2(self.conv1(            x if self.stride == 1 else self.avgpool(x)))        b, c, h, w = weight.shape        weight = weight.reshape((            b, self.groups, self.kernel_size**2, h, w)).unsqueeze(2)        out = nn.functional.unfold(            x, self.kernel_size, strides=self.stride, paddings=(self.kernel_size-1)//2, dilations=1)        out = out.reshape(            (b, self.groups, self.group_channels, self.kernel_size**2, h, w))        out = (weight * out).sum(axis=3).reshape((b, self.channels, h, w))        return out
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算子测试

In [3]
inv = involution(128, 7, 1)paddle.summary(inv, (1, 128, 64, 64))out = inv(paddle.randn((1, 128, 64, 64)))print(out.shape)
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--------------------------------------------------------------------------- Layer (type)       Input Shape          Output Shape         Param #    ===========================================================================   Conv2D-1      [[1, 128, 64, 64]]    [1, 32, 64, 64]         4,096      BatchNorm2D-1   [[1, 32, 64, 64]]     [1, 32, 64, 64]          128          ReLU-1       [[1, 32, 64, 64]]     [1, 32, 64, 64]           0          Conv2D-2      [[1, 32, 64, 64]]     [1, 392, 64, 64]       12,936     ===========================================================================Total params: 17,160Trainable params: 17,032Non-trainable params: 128---------------------------------------------------------------------------Input size (MB): 2.00Forward/backward pass size (MB): 15.25Params size (MB): 0.07Estimated Total Size (MB): 17.32---------------------------------------------------------------------------[1, 128, 64, 64]
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/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddle/nn/layer/norm.py:648: UserWarning: When training, we now always track global mean and variance.  "When training, we now always track global mean and variance.")
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RedNet

使用 involution 替换 ResNet BottleneckBlock 中的 3x3 convolution 得到了一族新的骨干网络 RedNet性能和效率优于 ResNet 和其他 self-attention 做 op 的 SOTA 模型模型具体信息如下:In [4]
class BottleneckBlock(resnet.BottleneckBlock):    def __init__(self,                 inplanes,                 planes,                 stride=1,                 downsample=None,                 groups=1,                 base_width=64,                 dilation=1,                 norm_layer=None):        super(BottleneckBlock, self).__init__(inplanes, planes, stride,                                              downsample, groups, base_width, dilation, norm_layer)        width = int(planes * (base_width / 64.)) * groups        self.conv2 = involution(width, 7, stride)        class RedNet(resnet.ResNet):    def __init__(self, block, depth, num_classes=1000, with_pool=True):        super(RedNet, self).__init__(block=block, depth=50,                                     num_classes=num_classes, with_pool=with_pool)        layer_cfg = {            26: [1, 2, 4, 1],            38: [2, 3, 5, 2],            50: [3, 4, 6, 3],            101: [3, 4, 23, 3],            152: [3, 8, 36, 3]        }        layers = layer_cfg[depth]        self.conv1 = None        self.bn1 = None        self.relu = None        self.inplanes = 64        self.stem = nn.Sequential(            nn.Sequential(                ('conv', nn.Conv2D(                    in_channels=3,                    out_channels=self.inplanes // 2,                    kernel_size=3,                    stride=2,                    padding=1,                    bias_attr=False                )),                ('bn', nn.BatchNorm2D(self.inplanes // 2)),                ('activate', nn.ReLU())            ),            involution(self.inplanes // 2, 3, 1),            nn.BatchNorm2D(self.inplanes // 2),            nn.ReLU(),            nn.Sequential(                ('conv', nn.Conv2D(                    in_channels=self.inplanes // 2,                    out_channels=self.inplanes,                    kernel_size=3,                    stride=1,                    padding=1,                    bias_attr=False                )),                ('bn', nn.BatchNorm2D(self.inplanes)),                ('activate', nn.ReLU())            )        )        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)    def forward(self, x):        x = self.stem(x)        x = self.maxpool(x)        x = self.layer1(x)        x = self.layer2(x)        x = self.layer3(x)        x = self.layer4(x)        if self.with_pool:            x = self.avgpool(x)        if self.num_classes > 0:            x = paddle.flatten(x, 1)            x = self.fc(x)        return x
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模型测试

In [5]
model = RedNet(BottleneckBlock, 26)paddle.summary(model, (1, 3, 224, 224))out = model(paddle.randn((1, 3, 224, 224)))print(out.shape)
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-------------------------------------------------------------------------------   Layer (type)         Input Shape          Output Shape         Param #    ===============================================================================     Conv2D-88       [[1, 3, 224, 224]]   [1, 32, 112, 112]         864        BatchNorm2D-71    [[1, 32, 112, 112]]   [1, 32, 112, 112]         128            ReLU-35       [[1, 32, 112, 112]]   [1, 32, 112, 112]          0            Conv2D-89      [[1, 32, 112, 112]]    [1, 8, 112, 112]         256        BatchNorm2D-72     [[1, 8, 112, 112]]    [1, 8, 112, 112]         32             ReLU-36        [[1, 8, 112, 112]]    [1, 8, 112, 112]          0            Conv2D-90       [[1, 8, 112, 112]]   [1, 18, 112, 112]         162         involution-18    [[1, 32, 112, 112]]   [1, 32, 112, 112]          0         BatchNorm2D-73    [[1, 32, 112, 112]]   [1, 32, 112, 112]         128            ReLU-37       [[1, 32, 112, 112]]   [1, 32, 112, 112]          0            Conv2D-91      [[1, 32, 112, 112]]   [1, 64, 112, 112]       18,432       BatchNorm2D-74    [[1, 64, 112, 112]]   [1, 64, 112, 112]         256            ReLU-38       [[1, 64, 112, 112]]   [1, 64, 112, 112]          0           MaxPool2D-1     [[1, 64, 112, 112]]    [1, 64, 56, 56]           0            Conv2D-93       [[1, 64, 56, 56]]     [1, 64, 56, 56]         4,096       BatchNorm2D-76     [[1, 64, 56, 56]]     [1, 64, 56, 56]          256            ReLU-39        [[1, 256, 56, 56]]    [1, 256, 56, 56]          0            Conv2D-96       [[1, 64, 56, 56]]     [1, 16, 56, 56]         1,024       BatchNorm2D-79     [[1, 16, 56, 56]]     [1, 16, 56, 56]          64             ReLU-40        [[1, 16, 56, 56]]     [1, 16, 56, 56]           0            Conv2D-97       [[1, 16, 56, 56]]     [1, 196, 56, 56]        3,332        involution-19     [[1, 64, 56, 56]]     [1, 64, 56, 56]           0         BatchNorm2D-77     [[1, 64, 56, 56]]     [1, 64, 56, 56]          256           Conv2D-95       [[1, 64, 56, 56]]     [1, 256, 56, 56]       16,384       BatchNorm2D-78     [[1, 256, 56, 56]]    [1, 256, 56, 56]        1,024          Conv2D-92       [[1, 64, 56, 56]]     [1, 256, 56, 56]       16,384       BatchNorm2D-75     [[1, 256, 56, 56]]    [1, 256, 56, 56]        1,024     BottleneckBlock-17   [[1, 64, 56, 56]]     [1, 256, 56, 56]          0            Conv2D-99       [[1, 256, 56, 56]]    [1, 128, 56, 56]       32,768       BatchNorm2D-81     [[1, 128, 56, 56]]    [1, 128, 56, 56]         512            ReLU-41        [[1, 512, 28, 28]]    [1, 512, 28, 28]          0           AvgPool2D-4      [[1, 128, 56, 56]]    [1, 128, 28, 28]          0           Conv2D-102       [[1, 128, 28, 28]]    [1, 32, 28, 28]         4,096       BatchNorm2D-84     [[1, 32, 28, 28]]     [1, 32, 28, 28]          128            ReLU-42        [[1, 32, 28, 28]]     [1, 32, 28, 28]           0           Conv2D-103       [[1, 32, 28, 28]]     [1, 392, 28, 28]       12,936        involution-20     [[1, 128, 56, 56]]    [1, 128, 28, 28]          0         BatchNorm2D-82     [[1, 128, 28, 28]]    [1, 128, 28, 28]         512          Conv2D-101       [[1, 128, 28, 28]]    [1, 512, 28, 28]       65,536       BatchNorm2D-83     [[1, 512, 28, 28]]    [1, 512, 28, 28]        2,048          Conv2D-98       [[1, 256, 56, 56]]    [1, 512, 28, 28]       131,072      BatchNorm2D-80     [[1, 512, 28, 28]]    [1, 512, 28, 28]        2,048     BottleneckBlock-18   [[1, 256, 56, 56]]    [1, 512, 28, 28]          0           Conv2D-104       [[1, 512, 28, 28]]    [1, 128, 28, 28]       65,536       BatchNorm2D-85     [[1, 128, 28, 28]]    [1, 128, 28, 28]         512            ReLU-43        [[1, 512, 28, 28]]    [1, 512, 28, 28]          0           Conv2D-107       [[1, 128, 28, 28]]    [1, 32, 28, 28]         4,096       BatchNorm2D-88     [[1, 32, 28, 28]]     [1, 32, 28, 28]          128            ReLU-44        [[1, 32, 28, 28]]     [1, 32, 28, 28]           0           Conv2D-108       [[1, 32, 28, 28]]     [1, 392, 28, 28]       12,936        involution-21     [[1, 128, 28, 28]]    [1, 128, 28, 28]          0         BatchNorm2D-86     [[1, 128, 28, 28]]    [1, 128, 28, 28]         512          Conv2D-106       [[1, 128, 28, 28]]    [1, 512, 28, 28]       65,536       BatchNorm2D-87     [[1, 512, 28, 28]]    [1, 512, 28, 28]        2,048     BottleneckBlock-19   [[1, 512, 28, 28]]    [1, 512, 28, 28]          0           Conv2D-110       [[1, 512, 28, 28]]    [1, 256, 28, 28]       131,072      BatchNorm2D-90     [[1, 256, 28, 28]]    [1, 256, 28, 28]        1,024           ReLU-45       [[1, 1024, 14, 14]]   [1, 1024, 14, 14]          0           AvgPool2D-5      [[1, 256, 28, 28]]    [1, 256, 14, 14]          0           Conv2D-113       [[1, 256, 14, 14]]    [1, 64, 14, 14]        16,384       BatchNorm2D-93     [[1, 64, 14, 14]]     [1, 64, 14, 14]          256            ReLU-46        [[1, 64, 14, 14]]     [1, 64, 14, 14]           0           Conv2D-114       [[1, 64, 14, 14]]     [1, 784, 14, 14]       50,960        involution-22     [[1, 256, 28, 28]]    [1, 256, 14, 14]          0         BatchNorm2D-91     [[1, 256, 14, 14]]    [1, 256, 14, 14]        1,024         Conv2D-112       [[1, 256, 14, 14]]   [1, 1024, 14, 14]       262,144      BatchNorm2D-92    [[1, 1024, 14, 14]]   [1, 1024, 14, 14]        4,096         Conv2D-109       [[1, 512, 28, 28]]   [1, 1024, 14, 14]       524,288      BatchNorm2D-89    [[1, 1024, 14, 14]]   [1, 1024, 14, 14]        4,096     BottleneckBlock-20   [[1, 512, 28, 28]]   [1, 1024, 14, 14]          0           Conv2D-115      [[1, 1024, 14, 14]]    [1, 256, 14, 14]       262,144      BatchNorm2D-94     [[1, 256, 14, 14]]    [1, 256, 14, 14]        1,024           ReLU-47       [[1, 1024, 14, 14]]   [1, 1024, 14, 14]          0           Conv2D-118       [[1, 256, 14, 14]]    [1, 64, 14, 14]        16,384       BatchNorm2D-97     [[1, 64, 14, 14]]     [1, 64, 14, 14]          256            ReLU-48        [[1, 64, 14, 14]]     [1, 64, 14, 14]           0           Conv2D-119       [[1, 64, 14, 14]]     [1, 784, 14, 14]       50,960        involution-23     [[1, 256, 14, 14]]    [1, 256, 14, 14]          0         BatchNorm2D-95     [[1, 256, 14, 14]]    [1, 256, 14, 14]        1,024         Conv2D-117       [[1, 256, 14, 14]]   [1, 1024, 14, 14]       262,144      BatchNorm2D-96    [[1, 1024, 14, 14]]   [1, 1024, 14, 14]        4,096     BottleneckBlock-21  [[1, 1024, 14, 14]]   [1, 1024, 14, 14]          0           Conv2D-120      [[1, 1024, 14, 14]]    [1, 256, 14, 14]       262,144      BatchNorm2D-98     [[1, 256, 14, 14]]    [1, 256, 14, 14]        1,024           ReLU-49       [[1, 1024, 14, 14]]   [1, 1024, 14, 14]          0           Conv2D-123       [[1, 256, 14, 14]]    [1, 64, 14, 14]        16,384       BatchNorm2D-101    [[1, 64, 14, 14]]     [1, 64, 14, 14]          256            ReLU-50        [[1, 64, 14, 14]]     [1, 64, 14, 14]           0           Conv2D-124       [[1, 64, 14, 14]]     [1, 784, 14, 14]       50,960        involution-24     [[1, 256, 14, 14]]    [1, 256, 14, 14]          0         BatchNorm2D-99     [[1, 256, 14, 14]]    [1, 256, 14, 14]        1,024         Conv2D-122       [[1, 256, 14, 14]]   [1, 1024, 14, 14]       262,144      BatchNorm2D-100   [[1, 1024, 14, 14]]   [1, 1024, 14, 14]        4,096     BottleneckBlock-22  [[1, 1024, 14, 14]]   [1, 1024, 14, 14]          0           Conv2D-125      [[1, 1024, 14, 14]]    [1, 256, 14, 14]       262,144      BatchNorm2D-102    [[1, 256, 14, 14]]    [1, 256, 14, 14]        1,024           ReLU-51       [[1, 1024, 14, 14]]   [1, 1024, 14, 14]          0           Conv2D-128       [[1, 256, 14, 14]]    [1, 64, 14, 14]        16,384       BatchNorm2D-105    [[1, 64, 14, 14]]     [1, 64, 14, 14]          256            ReLU-52        [[1, 64, 14, 14]]     [1, 64, 14, 14]           0           Conv2D-129       [[1, 64, 14, 14]]     [1, 784, 14, 14]       50,960        involution-25     [[1, 256, 14, 14]]    [1, 256, 14, 14]          0         BatchNorm2D-103    [[1, 256, 14, 14]]    [1, 256, 14, 14]        1,024         Conv2D-127       [[1, 256, 14, 14]]   [1, 1024, 14, 14]       262,144      BatchNorm2D-104   [[1, 1024, 14, 14]]   [1, 1024, 14, 14]        4,096     BottleneckBlock-23  [[1, 1024, 14, 14]]   [1, 1024, 14, 14]          0           Conv2D-131      [[1, 1024, 14, 14]]    [1, 512, 14, 14]       524,288      BatchNorm2D-107    [[1, 512, 14, 14]]    [1, 512, 14, 14]        2,048           ReLU-53        [[1, 2048, 7, 7]]     [1, 2048, 7, 7]           0           AvgPool2D-6      [[1, 512, 14, 14]]     [1, 512, 7, 7]           0           Conv2D-134        [[1, 512, 7, 7]]      [1, 128, 7, 7]        65,536       BatchNorm2D-110     [[1, 128, 7, 7]]      [1, 128, 7, 7]          512            ReLU-54         [[1, 128, 7, 7]]      [1, 128, 7, 7]           0           Conv2D-135        [[1, 128, 7, 7]]     [1, 1568, 7, 7]        202,272       involution-26     [[1, 512, 14, 14]]     [1, 512, 7, 7]           0         BatchNorm2D-108     [[1, 512, 7, 7]]      [1, 512, 7, 7]         2,048         Conv2D-133        [[1, 512, 7, 7]]     [1, 2048, 7, 7]       1,048,576     BatchNorm2D-109    [[1, 2048, 7, 7]]     [1, 2048, 7, 7]         8,192         Conv2D-130      [[1, 1024, 14, 14]]    [1, 2048, 7, 7]       2,097,152     BatchNorm2D-106    [[1, 2048, 7, 7]]     [1, 2048, 7, 7]         8,192     BottleneckBlock-24  [[1, 1024, 14, 14]]    [1, 2048, 7, 7]           0       AdaptiveAvgPool2D-1  [[1, 2048, 7, 7]]     [1, 2048, 1, 1]           0            Linear-1           [[1, 2048]]           [1, 1000]          2,049,000   ===============================================================================Total params: 9,264,318Trainable params: 9,202,014Non-trainable params: 62,304-------------------------------------------------------------------------------Input size (MB): 0.57Forward/backward pass size (MB): 188.62Params size (MB): 35.34Estimated Total Size (MB): 224.53-------------------------------------------------------------------------------[1, 1000]
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模型精度验证

使用 Paddle-Image-Models 来进行模型精度验证

安装 PPIM

In [ ]
!pip install ppim==1.0.1 -i https://pypi.python.org/pypi
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解压数据集

解压 ILSVRC2012 验证集In [ ]
# 解压数据集!mkdir ~/data/ILSVRC2012!tar -xf ~/data/data68594/ILSVRC2012_img_val.tar -C ~/data/ILSVRC2012
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模型评估

使用 ILSVRC2012 验证集进行精度验证In [ ]
import osimport cv2import numpy as npimport paddleimport paddle.vision.transforms as Tfrom ppim import rednet26, rednet38, rednet50, rednet101, rednet152# 构建数据集# backend cv2class ILSVRC2012(paddle.io.Dataset):    def __init__(self, root, label_list, transform):        self.transform = transform        self.root = root        self.label_list = label_list        self.load_datas()    def load_datas(self):        self.imgs = []        self.labels = []        with open(self.label_list, 'r') as f:            for line in f:                img, label = line[:-1].split(' ')                self.imgs.append(os.path.join(self.root, img))                self.labels.append(int(label))    def __getitem__(self, idx):        label = self.labels[idx]        image = self.imgs[idx]        image = cv2.imread(image)        image = self.transform(image)        return image.astype('float32'), np.array(label).astype('int64')    def __len__(self):        return len(self.imgs)# 配置模型model, val_transforms = rednet26(pretrained=True)model = paddle.Model(model)model.prepare(metrics=paddle.metric.Accuracy(topk=(1, 5)))# 配置数据集val_dataset = ILSVRC2012('data/ILSVRC2012', transform=val_transforms, label_list='data/data68594/val_list.txt')# 模型验证model.evaluate(val_dataset, batch_size=16)
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{'acc_top1': 0.75956, 'acc_top5': 0.9319}
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OpenAI关闭Sora后战略转向:收购TBPN播客,深度布局内容生态 四月初的科技界新闻不断,一则来自科技媒体9to5Mac的报道引发了行业的强烈关注。OpenAI在近期宣布正式收购知名科技商业播客品牌The Browser Pane。这一战略动作紧随其视频应用Sora的停止运营之后,被外界普遍视

时间:2026-04-03 15:58
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