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trellis/pipelines/samplers/classifier_free_guidance_mixin.py

@@ -0,0 +1,12 @@
+from typing import *
+
+
+class ClassifierFreeGuidanceSamplerMixin:
+    """
+    A mixin class for samplers that apply classifier-free guidance.
+    """
+
+    def _inference_model(self, model, x_t, t, cond, neg_cond, cfg_strength, **kwargs):
+        pred = super()._inference_model(model, x_t, t, cond, **kwargs)
+        neg_pred = super()._inference_model(model, x_t, t, neg_cond, **kwargs)
+        return (1 + cfg_strength) * pred - cfg_strength * neg_pred