Update README.md

README.md

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-license: mit
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+license: mit
+---
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+Details on the code used to produce and use this model are available at:
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+https://github.com/schrum2/MarioDiffusion
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+That repo has instructions to check out this model and apply it to the generation of Super Mario Bros. level scenes. 
+There is also an interactive GUI for constructing complete levels out of model-generated scenes.
+
+This model had good performance in our experiments, but it challenging to use because it was trained with 
+lengthy "absence" captions that list various elements that are absent in each game scene. When that information
+is not supplied, the results can be counterintuitive.