week1：
answer：false image for cat recognition is an example of 'unstructed' date
answer： A：we can train it on many pairs if sentences x(English) and y(French)
C: an RNN can map from a sequence of English words to a sequence of french words
answers: A:Bring mor data to a model is almost always beneficial
C:According the size of a neural network generally does not huir an algorithm's performance,and it may help significantly