Network in Network (NiN)

This novel deep network structure called "Network In Network" (NIN) to enhance model discriminability for local patches within the receptive field. The conventional convolutional layer uses linear filters followed by a nonlinear activation function to scan the input. Instead, build micro neural networks with more complex structures to abstract the data within the receptive field.




Initial contribute: 2020-12-05


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Method-focused categoriesData-perspectiveIntelligent computation analysis

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The inputs and outputs of convolutional layers consist of four-dimensional tensors with axes corresponding to the example, channel, height, and width. The inputs and outputs of fully-connected layers are typically two-dimensional tensors corresponding to the example and feature. The idea behind NiN is to apply a fully-connected layer at each pixel location (for each height and width). If we tie the weights across each spatial location, we could think of this as a  1×1  convolutional layer (as described in Section 6.4) or as a fully-connected layer acting independently on each pixel location. Another way to view this is to think of each element in the spatial dimension (height and width) as equivalent to an example and a channel as equivalent to a feature.

The following figure illustrates the main structural differences between VGG and NiN, and their blocks. The NiN block consists of one convolutional layer followed by two  1×1  convolutional layers that act as per-pixel fully-connected layers with ReLU activations. The convolution window shape of the first layer is typically set by the user. The subsequent window shapes are fixed to  1×1 .




Min Lin (2020). Network in Network (NiN), Model Item, OpenGMS,


Initial contribute : 2020-12-05



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