Before revision:  Second, this paper proposes eight machine learning models for sentiment prediction, which are the most popular models used in classification problems. Third , the comparison of these models is conducted via various metrics, and this paper also discusses the optimization method of these models from the perspective of model parameters and input data structures.
After revision:  Second, this paper proposes eight machine learning models . To better provide decision-makers with the appropriate model , the comparison of these models is conducted via various metrics, and this paper also discusses the optimization method of these models from the perspective of model parameters and input data structures.