fix kitti data sequence parsing (#80)

Author: saurabh1002

python/map_closures/datasets/kitti.py

@@ -28,15 +28,15 @@
 
 class KITTIOdometryDataset:
     def __init__(self, data_dir, sequence: str, *_, **__):
-        self.sequence_id = sequence
+        self.sequence_id = str(sequence).zfill(2)
         self.sequence_dir = os.path.join(data_dir, "sequences", self.sequence_id)
         self.velodyne_dir = os.path.join(self.sequence_dir, "velodyne/")
 
         self.scan_files = sorted(glob.glob(self.velodyne_dir + "*.bin"))
         self.calibration = self.read_calib_file(os.path.join(self.sequence_dir, "calib.txt"))
 
         # Load GT Poses (if available)
-        if sequence < 11:
+        if int(sequence) < 11:
             self.poses_fn = os.path.join(data_dir, f"poses/{self.sequence_id}.txt")
             self.gt_poses = self.load_poses(self.poses_fn)