Before revision:  The performances of these models were evaluated under four different scenarioson a dataset of 2234 video sequences collected from 22 users . The modified GRU-based model outperforms the standard CNN-RNN and Conv3D models for three of the four scenarios. The results are encouraging and suggest promising directions for future research .
After revision:  The performances of these models were evaluated under four different scenarioson a dataset of 2234 video sequences collected from 22 users .