| A Non-negative Matrix Factorization Based Approach for Active Dual Supervision from Document and Word Labels Recent countries visiting this post |  |
 | 5 | United States |
 | 1 | Germany |
 | 1 | China |
| A Non-negative Matrix Factorization Based Approach for Active Dual Supervision from Document and Word Labels Recent countries visiting this post | |
| 5 | United States |
| 1 | Germany |
| 1 | China |