*5.2. Context Impacts on Fine-Grained WD*

We defined fine-grained WD in order to distinguish a walking activity from a walk-like activity and riding a bicycle. The baseline performance (accuracy) under a predefined context is used to compare with the new performances when more contexts such as placement and orientation are available. Since there are more data on walking than on walk-like activities, we balance the ratio to 1:1 by random selection.
