90. Which classification (or clustering) method in machine learning field is an unsupervised learning method？
(A) k-means clustering algorithm
(B) convolutional neural network
(C) Naive Bayes classifier
(D) support vector machines

86. A Turing machine is a mathematical model of computation that defines an abstract machine. Which of the following statement is wrong about the Turing machine？ (A)Turing machine uses random-access memory. (B)In the Turing machine model, it assumes that there is unlimited memory. (C)Even there are more than one tapes in the Turing machine, it still has the same ability with the original version. (D)In the Turing machine, there is a head that can read and write symbols on the tape and move the tape left and right one cell at a time.

87. Which one is the lossy compression methods in data compression？ (A) Run-length encoding (B) Joint photographic experts group (JPEG) (C) Huffman encoding (D) Lempel Ziv (LZ) encoding

88. Let f(n)= f(n-1)+(n-1) , where n ≥ 2 , and let f(1) =0 . Then (A)f(n)=n2-2n+1 (B)f(n)=n2-n (C) (D)

89. When taking pictures in reduced lighting (i.e., low illumination), image noise becomes apparent. One simple way to reduce this granular noise is to take several identical pictures and                  them. (A) XOR (logic operation) (B) average (arithmetic operation) (C) OR (logic operation) (D) AND (logic operation)

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