The documentation page API/MODELS/&AMP;NUM;DIFFUSERS.SD3TRANSFORMER2DMODEL.SAMPLE_SIZE doesn’t exist in v0.29.1, but exists on the main version. Click <a href="/docs/diffusers/main/en/api/models/&amp;num;diffusers.SD3Transformer2DModel.sample_size">here</a> to redirect to the main version of the documentation.