| Extracting Places and Activities from GPS Traces Using Hierarchical Conditional Random Fields Recent countries visiting this post |  |
 | 5 | United States |
 | 1 | |
 | 1 | Sweden |
 | 1 | China |
| Extracting Places and Activities from GPS Traces Using Hierarchical Conditional Random Fields Recent countries visiting this post | |
| 5 | United States |
| 1 | |
| 1 | Sweden |
| 1 | China |