Database - Data Mining

81. If g(z) is the sigmoid function, then its derivative with respect to z may be written in term of g(z) as

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82. In the linearly non-separable case, what effect does the C parameter have on the SVM mode.

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83. Suppose that we use a RBF kernel with appropriate parameters to perform classification on a particular two class data set where the data is not linearly separable. In this scenario
1. the decision boundary in the transformed feature space is non-linear
2. the decision boundary in the transformed feature space is linear
3. the decision boundary in the original feature space is linear
4. the decision boundary in the original feature space is non-linear

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84. Which of the following statements is/are true about kernel is SVM?
1. Kernel function map low dimensional data to high dimensional space
2. It's a similarity function

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85. You are given reviews of few movies marked as positive, negative or neutral. Classifying reviews of a new movie is an example of

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