| keyword | 1 | 2 | 3 | 4 | 5 |
| china | 0.547 | 0.512 | 0.537 | 0.529 | 0.53 |
| italy | 0.421 | 0.535 | 0.274 | 0.363 | 0.226 |
| pisa | 0.352 | 0.365 | 0.035 | 0.181 | 0.036 |
| tiantan | 0.311 | 0.361 | 0.285 | 0.317 | 0.131 |
| sky | 0.379 | 0.34 | 0.321 | 0.322 | 0.204 |
| water | 0.092 | 0.086 | 0.064 | 0.108 | 0 |
| florence | 0.294 | 0.294 | 0 | 0.071 | 0.076 |
| firenze | 0.294 | 0.294 | 0 | 0.071 | 0.076 |
| bryan | 0.172 | 0.137 | 0.171 | 0.139 | 0.117 |
| amy | 0.307 | 0.333 | 0.368 | 0.363 | 0.312 |
| trees | 0.177 | 0.222 | 0.2 | 0.156 | 0.137 |
| beijing | 0.235 | 0.255 | 0.153 | 0.137 | 0.083 |
| shyam | 0.758 | 0.8 | 0.615 | 0.714 | 0.363 |
| cloud | 0.666 | 0.6 | 0.38 | 0.454 | 0.21 |
| lucca | 0 | 0 | 0 | 0 | 0 |
| hazy | 0.105 | 0.23 | 0 | 0 | 0 |