Activity Feature Solving Based on TF-IDF for Activity Recognition in Smart Homes

Algorithm 2

solveTF-IDFFeature.

Input: , a set of activity instances

, set of features

Output:

1. ;

2. ;

3. while(j<=m)

4. Collect all sensors which are activated when is active;

5. Calculate the TF-IDF value of using , formula (1) and formula (2);

6. ;++;

7. while(k<=n)

8. for each    in  

9. if is same to   then

10. ;

11. end if

12. end for

13. ++;

14. end while

15. end while

16. return