1)
The options A and C are true .
As in option A we can use the margin as a regularizatiom term to prevent overfitting.For regularizatiom we have to choose the parameter C correctly in order to avoid overfitting or underfitting of the model. There is a tradeoff between margin and regularization parameter C low c means high margin and high c means low margin.
Option C is correct as Svm classifier can be trained without knowing the feature value for each sample using the valid kernal. As we can use the valide kernal like poly , sigmoid, RBF kernal to transform the nonlinear feature space into linear feature space in order to get the correct feature map which can be used by the SVM for classification without knowing the actual feature value for each sample data.
Q2)
Option A and option C are correct
Option A is true as the there is a linear relationship betweem the training samples and the depth of decison tree..
Option C is correct as in case of decision trees we are using the tree pruning in order to avoid the overfitting of model..Tree pruning leads to the reduction in the complexity of final classifier and increases the accuracy by reduction of overfitting
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