max() arg is an empty sequence

[bigFatCatTom]

我在训练自己数据集的时候，
出现：
.../ReDet/mmdet/core/bbox/transforms_rbbox.py", line 567, in mask2poly_single
max_contour = max(contours, key=len)
ValueError: max() arg is an empty sequence。
这是我在制作数据局的过程中有什么忽视掉的地方么。

[Jiaming Han]

可能存在尺寸比较小的object，可以在dataset中加入尺寸判断：

ReDet/mmdet/datasets/DOTA2.py

Lines 130 to 132 in 0b9addf

 if ann['area'] <= 80 or max(w, h) < 10: 
     continue 
 bbox = [x1, y1, x1 + w - 1, y1 + h - 1] 

或者在dataset中判断mask_to_counter是否成功，对无法生成contour的object进行过滤，参考：

ReDet/mmdet/core/bbox/transforms_rbbox.py

Lines 557 to 574 in 0b9addf

 def mask2poly_single(binary_mask): 
     """ 
     :param binary_mask: 
     :return: 
     """ 
     # try: 
     contours, hierarchy = cv2.findContours(binary_mask, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_NONE) 
     # contour_lens = np.array(list(map(len, contours))) 
     # max_id = contour_lens.argmax() 
     # max_contour = contours[max_id] 
     max_contour = max(contours, key=len) 
     rect = cv2.minAreaRect(max_contour) 
     poly = cv2.boxPoints(rect) 
         # poly = TuplePoly2Poly(poly) 
     # except: 
         # import pdb 
         # pdb.set_trace() 
     return poly 

[Sairam13001]

Hai @bigFatCatTom , I am getting the same error while trying to train ReDet on VisDrone dataset. Did you solve this issue? Please let me know.

[bigFatCatTom]

Hai @bigFatCatTom , I am getting the same error while trying to train ReDet on VisDrone dataset. Did you solve this issue? Please let me know.

You can refer to the author's answer above