Just found this article myself:
  

      openaccess.thecvf.com
  

  
    

Cole_Multi-Label_Learning_From_Single_Positive_Labels_CVPR_2021_paper.pdf 2

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It claims that learning from single labels can work even when the single labeled training data actually had multiple classes represented in each image. (My plan was to use training images with just a single class present in each image.)
F