or tuple
  
If return_dict is True, an UNet2DConditionOutput is returned, otherwise
a tuple is returned where the first element is the sample tensor.
  The UNet2DConditionModel forward method.  fuse_qkv_projections  < source > ( )    Enables fused QKV projections. For self-attention modules, all projection matrices (i.e., query,
key, value) are fused. For cross-attention modules, key and value projection matrices are fused. This API is 🧪 experi