Zero dropped captions #77
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Previously when we applied caption dropout (via
caption_drop_probin the dataloader), those dropped captions (i.e. empty strings) would end up getting tokenized into padding tokens and encoded by the text encoder(s). This PR adds the option to instead encode the dropped captions as an all zeros tensor by settingzero_dropped_caption=True. Currently this flag is set such that zero-ing out dropped captions will become the new default behavior for both SD2 and SDXL training.