correct explanation: The for loop calculates the activation value for each neuron. So if there are 3 columns in W, there are 3 neurons in the dense layer, and therefore the for loop goes through 3 iterations (one for each neuron).

Wrong Explanation:

The for loop calculates the activation value for each neuron. So if there are 5 columns in W, there are 5 neurons in the dense layer, and therefore the for loop goes through 5 iterations (one for each neuron).