| Key words | The amount | Frequency % |
| Model | 18 | 12% |
| Neural networks | 15 | 10% |
| Prediction | 14 | 9% |
| Time series | 13 | 9% |
| Index | 11 | 7% |
| Machine | 10 | 7% |
| LSTM | 9 | 6% |
| Neural network | 9 | 6% |
| Volatility | 7 | 5% |
| Classification | 6 | 4% |
| Others | 39 | 26% |
| Total | 151 | 100% |