Updating weights and bias in neural network

Course Q&A Math for Machine Learning Calculus for Machine Learning and Data Science
1

Why do we update each weights and bias to minimize log loss in neural networks?

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2

We update the weights and bias values in order to reach the minimum cost.

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3

means that each layer in the neural network runs multiple times in order to find the best weight value from one perceptron to another. Am I right?

please correct me. Thanks

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4

Yes.

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7

Sorry, please excuse and ignore these two messages. I posted them on the wrong thread.

My apologies.