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Add x-prediction / prediction_type=sample support for SDXL fine-tuning #5095

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Merged
merged 2 commits into from
Sep 19, 2023
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Add x-prediction / prediction_type=sample support for SDXL fine-tuning #5095

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a515af2
Add x-prediction / prediction_type=sample support for SDXL fine-tuning
Sep 19, 2023
0f4d841
Merge branch 'main' into feature/train-sample-prediction-type
sayakpaul Sep 19, 2023
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5 changes: 5 additions & 0 deletions examples/text_to_image/train_text_to_image_sdxl.py
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Expand Up @@ -998,6 +998,11 @@ def compute_time_ids(original_size, crops_coords_top_left):
target = noise
elif noise_scheduler.config.prediction_type == "v_prediction":
target = noise_scheduler.get_velocity(model_input, noise, timesteps)
elif noise_scheduler.config.prediction_type == "sample":
# We set the target to latents here, but the model_pred will return the noise sample prediction.
target = model_input
# We will have to subtract the noise residual from the prediction to get the target sample.
model_pred = model_pred - noise
else:
raise ValueError(f"Unknown prediction type {noise_scheduler.config.prediction_type}")

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