The official repo of the CVPR2021 oral paper: Representative Batch Normalization with Feature Calibration

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Deep LearningRBN
Overview

Representative Batch Normalization (RBN) with Feature Calibration

The official implementation of the CVPR2021 oral paper: Representative Batch Normalization with Feature Calibration

You only need to replace the BN with our RBN without any other adjustment.

Update

  • 2021.4.9 The Jittor implementation is available now in Jittor.
  • 2021.4.1 The training code of ImageNet classification using RBN is released.

Introduction

Batch Normalization (BatchNorm) has become the default component in modern neural networks to stabilize training. In BatchNorm, centering and scaling operations, along with mean and variance statistics, are utilized for feature standardization over the batch dimension. The batch dependency of BatchNorm enables stable training and better representation of the network, while inevitably ignores the representation differences among instances. We propose to add a simple yet effective feature calibration scheme into the centering and scaling operations of BatchNorm, enhancing the instance-specific representations with the negligible computational cost. The centering calibration strengthens informative features and reduces noisy features. The scaling calibration restricts the feature intensity to form a more stable feature distribution. Our proposed variant of BatchNorm, namely Representative BatchNorm, can be plugged into existing methods to boost the performance of various tasks such as classification, detection, and segmentation.

Applications

ImageNet classification

The training code of ImageNet classification is released in ImageNet_training folder.

Citation

If you find this work or code is helpful in your research, please cite:

@inproceedings{gao2021rbn,
  title={Representative Batch Normalization with Feature Calibration},
  author={Gao, Shang-Hua and Han, Qi and Li, Duo and Peng, Pai and Cheng, Ming-Ming and Pai Peng},
  booktitle=CVPR,
  year={2021}
}

Contact

If you have any questions, feel free to E-mail Shang-Hua Gao (shgao(at)live.com) and Qi Han(hqer(at)foxmail.com).

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Comments
  • 关于scaling Calibration的可学习参数b初始化问题

    关于scaling Calibration的可学习参数b初始化问题

    您好，我有个问题想问下，关于scaling calibration中，您对偏置b的参数初始化为1，这是有什么根据吗

    self.scale_weight.data.fill_(0)
self.scale_bias.data.fill_(1)

    因为根据你的公式 image 在限制函数中（沿用你代码的sigmoid函数），你先让可学习参数w初始化为0，那么整个限制函数中一开始就是

    R(wb)

    而wb一开始为1的时候，对应sigmoid的值约为0.731，把他提到方差外部，则方差变为原始方差的0.73*0.73 = 0.5329，相当于方差减半了。若一开始训练就做这么剧烈的变化，是不是对后续训练有一定影响？

    我能理解权重w初始化为0，可以根据centering calibration那一节有

    When the absolute value of wm is close to zero, the centering operation still relies on the running statistics.

    针对这两个可学习参数的初始值设定，有进行过相关实验探讨吗

    opened by MARD1NO 2
  • 使用fuse函数会报错

    使用fuse函数会报错

    def fuse_conv_and_bn(conv, bn): # https://tehnokv.com/posts/fusing-batchnorm-and-conv/ with torch.no_grad(): # init fusedconv = torch.nn.Conv2d(conv.in_channels, conv.out_channels, kernel_size=conv.kernel_size, stride=conv.stride, padding=conv.padding, bias=True)

        # prepare filters
    w_conv = conv.weight.clone().view(conv.out_channels, -1)
    w_bn = torch.diag(bn.weight.div(torch.sqrt(bn.eps + bn.running_var)))
    fusedconv.weight.copy_(torch.mm(w_bn, w_conv).view(fusedconv.weight.size()))

    # prepare spatial bias
    if conv.bias is not None:
        b_conv = conv.bias
    else:
        b_conv = torch.zeros(conv.weight.size(0))
    b_bn = bn.bias - bn.weight.mul(bn.running_mean).div(torch.sqrt(bn.running_var + bn.eps))
    fusedconv.bias.copy_(torch.mm(w_bn, b_conv.reshape(-1, 1)).reshape(-1) + b_bn)

    return fusedconv

    Fusing layers... Traceback (most recent call last): File "test.py", line 263, in opt.augment) File "test.py", line 45, in test model.fuse() File "/home/zzf/Desktop/yolov3-dbb+representbatchnorm/models.py", line 402, in fuse fused = torch_utils.fuse_conv_and_bn(conv, b) File "/home/zzf/Desktop/yolov3-dbb+representbatchnorm/utils/torch_utils.py", line 83, in fuse_conv_and_bn w_bn = torch.diag(bn.weight.div(torch.sqrt(bn.eps + bn.running_var))) RuntimeError: matrix or a vector expected

    把自己网络的batchnorm 改变后会报错麻烦解决以下。

    opened by xiaowanzizz 1
  • 论文中的一些疑惑

    论文中的一些疑惑

    您好，感谢您的工作！论文里的一些地方我没有明白，希望您能解答一下，谢谢。 ① image When the Km in Eqn.(5) is set to Uc，the running mean of Km is equal to E(X) 请问这句话应该怎么理解呢？ ②在Choice of Instance Statistics中，你提到的the mean and standard division over spatial dimensions, denoted by image 请问这两个值具体怎么计算？ ③ ”Since scaling calibration only restricts the feature intensity while not changing the amount of information, scaling with both channel and spatial statistics results in a similar performance.”，请问改变信息的数量是什么意思呢？

    opened by songyonger 1
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