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]