Basic knowledge of convolutional neural network

Convolution ： Use convolution kernel to extract features

Pooling （ Down sampling ）： Used to reduce the image , Preserve features

Two pooling methods ：

At the time of pooling , When extracting the features of the outer circle, supplement 0

Activation function

ReLUs Activation function :

if input > 0:
  return input
else:
  return 0

Full connection

With weight

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With weight