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Add needed columns to empty detections #23

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Add needed columns to empty detections #23

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2 changes: 2 additions & 0 deletions tracklab/engine/offline.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
import logging
import pandas as pd

from tracklab.engine import TrackingEngine
from tracklab.utils.cv2 import cv2_load_image
Expand Down Expand Up @@ -31,5 +32,6 @@ def video_loop(self, tracker_state, video, video_id):
detections, image_pred = self.default_step(batch, model_name, detections, image_pred)
self.callback("on_module_end", task=model_name, detections=detections)
if detections.empty:
detections = pd.DataFrame(columns=["image_id", "video_id"])
return detections, image_pred
return detections, image_pred