v2.6

• WebDSText2ImageSource: images in webdataset and text captions in label_file (.txt, .json, ...)
• Add drop probability option to TagDropoutHandler
• Fix GWLoss
• Remake sampler
• Add solver to sampler (Eular ODE solver, DPM dolver, ...)
• Fix bugs of attention_mask in TokenizeHandler
• Preview images with logger (preview to wandb/tensorboard, supported by rainbowneko>=1.10)
• Cache trainable_parameters in wrapper to reduce overhead. (Iteration over trainable_parameters is time-consuming)
• Support VAEs with latents_mean and latents_std