How to load multiple safetensors with json format

[oovm]

For such a task:

https://huggingface.co/black-forest-labs/FLUX.1-dev/tree/main/transformer

how should safetensors be loaded?

[LaurentMazare]

All the examples in this repo use hub_load_safetensors to load weights from a json description like this. In the case of flux, we actually use the main safetensors file at the root of the repo that combines all these together.

[oovm]

Thanks, this works great with mmap.

---

By the way, is there a plan to load and save a single flux model file? The model I downloaded from civit has this structure:

[
    "model.diffusion_model.double_blocks.0.img_attn.norm.key_norm.scale",
    "model.diffusion_model.single_blocks.9.norm.query_norm.scale",
    ...,
    "model.diffusion_model.final_layer.adaLN_modulation.1.bias",
    "model.diffusion_model.guidance_in.in_layer.bias",
    "model.diffusion_model.img_in.bias",
    ...
    "text_encoders.clip_l.logit_scale",
    "text_encoders.t5xxl.logit_scale",
    ...
    "vae.encoder.conv_out.weight",
]

And the python version also supports this:

https://github.com/huggingface/diffusers/pull/9083

[LaurentMazare]

This shouldn't be too hard to support as the weight structure seems mostly identical, my guess is that it would just require tweaking the example code and not require much/any change on the actual model side. Could you provide some pointers to models that use this layout?

[oovm]

flux-clip.json

scheduler/                # not mapping
text_encoder/             # -> text_encoders.clip_l.transformer.{KEY}
?                         # -> text_encoders.clip_l.logit_scale
text_encoder_2/           # -> text_encoders.t5xxl.transformer.{KEY}
?                         # -> text_encoders.t5xxl.logit_scale
tokenizer/                # no weights
tokenizer_2/              # no weights
transformer/              # not mapping?
vae/                      # not mapping?
ae.safetensors            # -> vae.{KEY}
flux1-dev.safetensors     # -> model.diffusion_model.{KEY}

---

['$.logit_scale', '$.transformer.text_projection.weight'] seems only used in ComfyUI.

ComfyUI seems to use single files instead of vae/ and transformer/.

[LaurentMazare]

Sorry I meant would you have a link to an actual safetensors file that has this layout so that I can give it a try?

[oovm]

https://huggingface.co/Comfy-Org/flux1-dev/tree/main?show_file_info=flux1-dev-fp8.safetensors

These formats can't actually be loaded because the dtype is not supported.

I can't find an unquantized version

[AlpineVibrations]

candle doesnt support fp8? why?

[zackangelo]

candle doesnt support fp8? why?

open PR to add support for it here #2989