'RawData/labels.txt': include all the activity labels available for the dataset (1 per row).
   Column 1: experiment number ID,
   Column 2: user number ID,
   Column 3: activity number ID
   Column 4: Label start point (in number of signal log samples (recorded at 50Hz))
   Column 5: Label end point (in number of signal log samples)

activity_type:
1 WALKING
2 WALKING_UPSTAIRS
3 WALKING_DOWNSTAIRS
4 SITTING
5 STANDING