dataset: Add threading and fix color_aug #2
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I add threading method to enhance segments loading. Also, I fix and apply color_aug function only in training phase.
In my evaluation, the after 100 epochs training the I-frame+ResNet152 reach 86.6% accuracy in UCF-101 and the time consumption is 1.55 sec/video.
After using the abovementioned changes and change test crops to 1, the accuracy drops a little bit to 85.2% and gain 30x efficiency that reaches 0.05 sec/video.