Suwei Zhang

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I had the same problem before. It is because there are grey scale images in my data. I solved this by: ``` from PIL import Image img = Image.open(img_name).convert('RGB') #...

Have a look at this. [Stackoverflow](https://stackoverflow.com/questions/33768836/topic-modling-how-to-use-the-lda-in-c-for-example-data)