feat_static_cat: "index of the static category"
feat_dynamic_real: "alway null for this dataset"
start: "start time always set at same dummy value"
item_id: "identifier id for each
target: "data associated with poses at sequence of times in clip"
[torso_x_position]
[torso_y_position]
[left_arm_angle]
[right_arm_angle]
[left_leg_angle]
[right_leg_angle]
[left_arm_lengths]
[right_arm_lengths]
[left_leg_lengths]
[right_leg_lengths]
