zhaotun commented on issue #13520: Check failed: b < len (21 vs. 21) slicing with begin[0]=21 exceends limit of 21 URL: https://github.com/apache/incubator-mxnet/issues/13520#issuecomment-495041518 I get the same error when train my own dataset. I use VOCLike to load my dataset which described at [https://gluon-cv.mxnet.io/build/examples_datasets/detection_custom.html](url)，and i change the CLASSES to my own classnames ,such as CLASSES=['1','2','3', ... ,'32']，i have 32 classes and the classname is from 1 to 32, then start the train , get the error 'Check failed: b < len (25 vs. 20) slicing with begin[3]=25 exceends limit of 20' , after many tries ,I found that the CLASSES in "C:\ProgramData\Anaconda3\Lib\site-packages\gluoncv\data\pascal_voc\detection.py" also need to be changed, when i changed it to my own classnames , the error disappeared . holp to be helpful.
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