1) RRandomCrop Runtime Error Fixed (when only one bounding box exists in the cropped); 2) mAP Print Error Fixed (when #class of model > # class of data); 3) confusion matrix color-theme error fixed!

1) RRandomCrop Runtime Error Fixed (when only one bounding box exists in the cropped); 2) mAP Print Error Fixed (when #class of model > # class of data); 3) confusion matrix color-theme error fixed! #575