Fig 1.
Hidden Markov Models.
Fig 2.
Overall framework.
Fig 3.
Clustering of 50 topics.
Fig 4.
The number of patent applications in the field of industrial Internet from 1965 to 2023.
Fig 5.
Industrial Internet patent topic.
Fig 6.
Patent subject word frequency distribution.
Table 1.
Patent topic keyword.
Fig 7.
Hidden Markov Model based on patent topic evolution.
Table 2.
Hidden Markov hidden transition probability moment.
Fig 8.
Observation sequence diagram.
Fig 9.
Comparison of hidden state prediction based on the Viterbi algorithm.
Fig 10.
The true value of the hidden state based on Viterbi algorithm.
Fig 11.
The predicted value of the hidden state based on Viterbi algorithm.
Fig 12.
The development trend of industrial Internet patent technology according to the year division.