code: def __getitem__(self, idx):
      data_info = self.data_infos[idx]
      img = cv2.imread(data_info["img_path"])
      img = img[self.cut_height :, :, :]
      sample = data_info.copy()
      sample.update({"image": img})
      img_org = sample["image"]
  
      if self.training:
          label = cv2.imread(sample["mask_path"], cv2.IMREAD_UNCHANGED)
          if len(label.shape) > 2:
              label = label[:, :, 0]
          label = label.squeeze()
          label = label[self.cut_height :, :]
          sample.update({"mask": label})
          if self.cut_height != 0:
              new_lanes = []
              for i in sample["lanes"]:
                  lanes = []
                  for p in i:
                      lanes.append((p[0], p[1] - self.cut_height))
                  new_lanes.append(lanes)
              sample.update({"lanes": new_lanes})
  
          sample["mask"] = SegmentationMapsOnImage(
              sample["mask"], shape=img_org.shape
          )
  
      sample["full_img_path"] = data_info["img_path"]
      sample["img_name"] = data_info["img_name"]
      sample["im_id"] = np.array([idx])
  
      sample["image"] = sample["image"].copy().astype(np.uint8)
      sample["lanes"] = lane_to_linestrings(sample["lanes"])
      sample["lanes"] = LineStringsOnImage(
          sample["lanes"], shape=img_org.shape
      )
      sample["seg"] = np.zeros(img_org.shape)
  
      return sample
  
imports: from ppdet.core.workspace import register, serializable
  import cv2
  import os
  import tarfile
  import numpy
  import os.path
  from ppdet.data.source.dataset import DetDataset
  from imgaug.augmentables.lines import LineStringsOnImage
  from imgaug.augmentables.segmaps import SegmentationMapsOnImage
  from ppdet.data.culane_utils import lane_to_linestrings
  import pickle
  from ppdet.utils.logger import setup_logger
  from .dataset import DetDataset, _make_dataset, _is_valid_file
  from ppdet.utils.download import download_dataset
label_desc: Use image node_id 10 for calling the CULaneDataSet obj's underlying member method code with example usage: obj.__getitem__(idx) and returns: sample