Similar to homework 2, we use the UCF101 data (see http://crcv.ucf.edu/data/UCF101.php). There are also 10 classes of data in this homework but the actual classes and data are different from the homework 2. Each clip has 3 frames and each frame is $64*64$ pixels. The label of clips are in $q3\_2\_data.mat$. $trLb$ are labels for training clips and $valLb$ are labels for validation clips.