Does every new animation need to be retrained?

[yize0106]

Hello, Thanks for releasing the nice work.
I have just come into contact with this field, and I have a question that I am curious about: If I want to animate new image with different appearances and customize new actions, do I need to use the image and related videos to train again?

If so, does it mean that the weights given by link were trained only on the reference image/video and no other new images/videos were used?

Looking forward to your answer very much！