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### 3.2.1 Forward Propagation and Back Propagation?
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### 3.2.1 Forward Propagation and Back Propagation?
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There are two main types of neural network calculations: foward propagation (FP) acts on the input of each layer, and the output is obtained by layer-by-layer calculation; backward propagation (BP) acts on the output of the network. Calculate the gradient from deep to shallow to update the network parameters.
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There are two main types of neural network calculations: forward propagation (FP) acts on the input of each layer, and the output is obtained by layer-by-layer calculation; backward propagation (BP) acts on the output of the network. Calculate the gradient from deep to shallow to update the network parameters.
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** Forward Propagation**
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** Forward Propagation**
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