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Update OCFBench-nuScenes/README.md
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The data format for OCFBench-nuScenes after mounting should be as the following:

OCFBench-nuScenes
β”œβ”€β”€ calib # Camera calibration
|   β”œβ”€β”€ 0000 # scene index
|   |   β”œβ”€β”€ CAM_NAME_intrinsic.bin # 3x3 camera intrinsic
|   |   β”œβ”€β”€ CAM_NAME_extrinsic.BIN # 4x4 camera extrinsic w.r.t. ego-vehicle
|   |   β”œβ”€β”€ ...
|   β”œβ”€β”€ ...

β”œβ”€β”€ cam_pose
|   β”œβ”€β”€ 0000 # scene index
|   |   β”œβ”€β”€ 0000_pose.bin # 4x4 ego-vehicle pose w.r.t. global coordinate
|   |   β”œβ”€β”€ 0001_pose.bin
|   |   β”œβ”€β”€ ...
|   β”œβ”€β”€ ...

β”œβ”€β”€ image
|   β”œβ”€β”€ 0000 # scene index
|   |   β”œβ”€β”€ 0000_CAM_NAME.jpg
|   |   β”œβ”€β”€ 0001_CAM_NAME.jpg
|   |   β”œβ”€β”€ ...
|   β”œβ”€β”€ ...

β”œβ”€β”€ image
|   β”œβ”€β”€ 1_2 # 1/2 downsample
|   |   β”œβ”€β”€ ... # same as image folder
|   β”œβ”€β”€ 1_4 # 1/4 downsample
|   |   β”œβ”€β”€ ...

β”œβ”€β”€ voxel
|   β”œβ”€β”€ 0000 # scene index
|   |   β”œβ”€β”€ 0010_input.npy # Start from 10th frame
|   |   β”œβ”€β”€ 0010_label.npy
|   |   β”œβ”€β”€ 0010_invalid.npy
|   |   β”œβ”€β”€ ...
|   β”œβ”€β”€ ...

β”œβ”€β”€ vis # Optional