In this work, we present FreeControl, a training-free approach for controllable T2I
    generation that supports multiple conditions, architectures, and checkpoints simultaneously.
    FreeControl designs structure guidance to facilitate the structure alignment with a guidance image, and appearance guidance to enable the
    appearance sharing between images generated using the same seed.
    FreeControl combines an analysis stage and a synthesis stage. In the analysis stage, FreeControl queries a
    T2I model to generate as few as one seed image and then constructs a linear feature subspace from the generated images.
    In the synthesis stage, FreeControl employs guidance in the subspace to facilitate structure alignment with a guidance
    image, as well as appearance alignment between images generated with and without control.
    
  
Comment: Builds a addition encoder to add spatial conditioning controls to T2I diffusion models.