Fig 1.
Research methods.
Fig 2.
The stakeholder composition of various platforms.
Table 1.
Classification criteria for various stakeholders.
Fig 3.
LDA model structure diagram.
Fig 4.
Convolutional neural network sentiment classification structure diagram.
Table 2.
Model parameter setting.
Table 3.
Sample data.
Fig 5.
Baidu index curve of "Norovirus".
Fig 6.
Topic perplexity curve.
Table 4.
Theme meaning and theme feature words.
Fig 7.
Thematic evolution accumulation map.
Fig 8.
Comparison of concerns of different stakeholders.
Table 5.
Distribution of concerns of stakeholders at each stage.
Fig 9.
The concern and emotion evolution model of each stakeholder.
Fig 10.
Comparison of concerns of stakeholders in the same life cycle.