Format of ground truth files
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-Each line contains the depth and label information
 of each pixel belonging to the body of the person
 in the video:

column1	column2	column3	column4
x 	y 	depth 	label


-Labels have the following values:

 2	BODY_TRUNK
16	RIGHT_UPPER_ARM
17	RIGHT_LOWER_ARM
18	RIGHT_HAND
24	LEFT_UPPER_ARM
25	LEFT_LOWER_ARM
26	LEFT_HAND