Question: For a neural network with at least 1 hidden layer and tanh ( * ) transformations in each non - input node, what is the

For a neural network with at least 1 hidden layer and tanh(*) transformations in each non-input node, what is the gradient (with respect to the weights) if all the weights are set to zero.
Is it a good idea to initialize the weights to zero?
For a neural network with at least 1 hidden layer

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