rescal flow to [-1,1]

[neauniko]

in gen_denseflow_npy.py :
Following I3D data preprocessing, for the flow stream, we convert the videos to grayscale,and pixel values are truncated to the range [-20, 20], then rescaled between -1 and 1. We only use the first two output dimensions, and apply the same cropping as for RGB.
but i dont see the operation '' recal flow from [-20, 20] to [-1, 1]''
Thanks for you work

[linchuming]

ActionDetection-AFSD/AFSD/common/gen_denseflow_npy.py

Line 84 in ed86a0d

os.system('denseflow {} -b=20 -a=tvl1 -s=1 -if -v -o={}'.format(video_name, output_dir))

use the denseflow will do the operation