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Backpropagation, an abbreviation for "backward propagation of errors", is a common method of training artificial neural networks used in conjunction with an optimization method such as gradient descent.

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Single input - multiple outputs with different loss functions in Keras: how is the gradient ...

In the code you provided, Keras is using a multi-output architecture for your neural network, with two branches each having their own output and loss function. The common part of the network is shared …
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