Regrouping the extracted features into social meta-features (suffix “-P” for the participant, and “-I” for the interlocutor).

Regrouping the extracted features into social meta-features (suffix “-P” for the participant, and “-I” for the interlocutor).将提取得到的特征重组为社会元特征（参与者对应的后缀为“-P”，对话者对应的后缀为“-I”）。