 the value of 1.0 as the default.   force_upcast (bool, optional, default to False) —
If enabled it will force the VAE to run in float32 for high image resolution pipelines, such as SD-XL. VAE
can be fine-tuned / trained to a lower range without losing too much precision, in which case
force_upcast can be set to False (see this fp16-friendly
AutoEncoder).    A tiny distilled VAE model for encoding images into latents and decoding latent represe