This is a GGUF conversion of Google's UMT5 xxl model, specifically the encoder part.
The weights can be used with ./llama-embedding or with the ComfyUI-GGUF custom node together with image/video generation models.
This is a non imatrix quant as llama.cpp doesn't support imatrix creation for T5 models at the time of writing. It's therefore recommended to use Q5_K_M or larger for the best results, although smaller models may also still provide decent results in resource constrained scenarios.