AlexNet在ImageNet竞赛
本文介绍AlexNet在2010年ImageNet竞赛中取得的成就，详细解析其网络结构，包括八层学习层（五层卷积与三层全连接），及ReLU非线性激活函数、重叠池化与Dropout等技术的应用，显著提升了分类准确率并减少过拟合。
Paper:
ImageNet Classification with Deep Convolutional Neual Network
Achievements:
The model addressed by Alex etl. achieved top-1 and top-5 test error rate of 37.5% and 17.0% of classifying the 1.2 million high-resolution images in the ImageNet LSVRC-2010 contest into the 1000 different classes.
The kernels of the second, fourth, and fifth convolutional layers are connected only to those kernel maps in the previous layer which reside on the same GPU. The kernels of the third convolutional layer are connected to all kernel maps in the second layer.
Response-normalization layers follow the first and second convolutional layers. Max-pooling layers, of the kind described in Section 3.4, follow both response-normalization layers as well as the fifth convolutional layer. The ReLU non-linearity is applied to the output of every convolutional and fully-connected layer.
Interesting Points:
ReLU Nonlinearity: speed-up, six times faster than an equivalent network with tanh neurons.
Overlapping Pooling: enhance accuracy and prevent overfitting, reduces the top-1 and top-5 error rates by 0.4% and 0.3%; training model with overlapping pooling find it slightly more difficult to overfit.
ImageNet Classification with Deep Convolutional Neual Network
Achievements:
The model addressed by Alex etl. achieved top-1 and top-5 test error rate of 37.5% and 17.0% of classifying the 1.2 million high-resolution images in the ImageNet LSVRC-2010 contest into the 1000 different classes.
Model Architecture:
model architecture plot:
The kernels of the second, fourth, and fifth convolutional layers are connected only to those kernel maps in the previous layer which reside on the same GPU. The kernels of the third convolutional layer are connected to all kernel maps in the second layer.
Response-normalization layers follow the first and second convolutional layers. Max-pooling layers, of the kind described in Section 3.4, follow both response-normalization layers as well as the fifth convolutional layer. The ReLU non-linearity is applied to the output of every convolutional and fully-connected layer.
Interesting Points:
ReLU Nonlinearity: speed-up, six times faster than an equivalent network with tanh neurons.
Overlapping Pooling: enhance accuracy and prevent overfitting, reduces the top-1 and top-5 error rates by 0.4% and 0.3%; training model with overlapping pooling find it slightly more difficult to overfit.
Dropout：prevent overfitting, reduces complex co-adaptations of neurons, since a neuron cannot rely on the presence of particular other neurons. It is, therefore, forced to learn more robust features that are useful in conjunction with many different random subsets of the other neurons.
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