v2.3

Evaluation

Add evaluators for select best ckpt and help for adjust hyperparameters. Support CLIPScore, FID, CCIPScore, ...

Sampler

Remake samplers using a new paradigm:
$$x_t = \alpha_t x_0 + \sigma_t \epsilon$$
$$x_0 = c_{skip} x_t + c_{out} F_{\theta} \left(c_{in} x_t, c_{noise}(t)\right)$$
$$v_t = \frac{dx_t}{dt}$$

• Support target type convert ($\epsilon \rightarrow x_0$, $\epsilon \rightarrow v_t$, ...)
• Support VP-SDE (DDPM, VP, ...)
• Support flow matching
• Support EDM

Updates:

• Fix file name bugs in SaveImageAction.
• Update to rainbowneko==1.9.
• Support save optimizer states.
• Support decompile config object into .py file.