It has been observed that non-linear classifiers are usually more powerful than the linear classifiers for text classification problems. But, that does not necessarily imply that a non-linear classifier is the solution to each text classification problem. It is quite interesting to note that there does not exist any optimal learning algorithm that can be universally applicable. Thus, the algorithm selection becomes quite a pivotal part of any modeling exercise. Also, the complexity of a model should not entirely be assumed by the fact that it is a linear or non-linear classifier; there are multiple other aspects of a modeling process, which can lead to complexity in the model, such as feature selection, ...

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