看 neural_network_in_python.pdf
feed-forward：input data feeds in only one direction.
backpropagation：performing a task using an iterative approach for trial and error.
steepness：gradient.
the choices of the weight and the biases determines the strength of prediction of the individual neurons.
bias：shift the enitre curve to the right or left.
weight：affect the steepness of the activation function curve.
numpy array
axis 0 : vertical axis.(column)
axis 1：horizontal axis.(row)
np.dot : 矩陣點積。
np.amax：矩陣column(axis0)或row(axis1)的最大值。
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