whether forward and predict in deep learning are the same

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robinho robinho 2022-8-13

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回答： Souvik Das 2022-8-18

采纳的回答： Souvik Das

So far I think they are the same but may I confirm?

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Answer 1

Souvik Das 2022-8-18

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'forward' is used to compute deep learning network output for TRAINING whereas 'predict' is used to compute deep learning network output for INFERENCE.

In some cases like yours, both may give similar results, however some deep learning layers behave differently during training and inference (prediction). For example, during training, dropout layers randomly set input elements to zero to help prevent overfitting, but during inference, dropout layers do not change the input.

Please refer the below links for more details-

forward function

predict function

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Answer 2

Souvik Das 2022-8-18

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I am assuming with 'forward', you mean 'forward propagation'. Deep learning networks usually have a lot of layers. Each layer accepts input data, processes it as per the activation function and passes it to the next layer. This is called 'forward propagation'.

In an abstract way, you can say 'prediction' is something that happens with the last layer where we get the final results from our deep learning network.

So 'prediction' and 'forward propagation' have a minor difference between them.

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robinho robinho 2022-8-18

thank you for your reply. If the network has several layers with x being the input data (dlarray format), then forward(network,x) and predict(network,x) yield the same result as far as I see.

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