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from typing import TYPE_CHECKING
if TYPE_CHECKING:
from modules.prompt_parser import SdConditioning
import torch
from huggingface_guess import model_list
from backend import memory_management
from backend.args import dynamic_args
from backend.diffusion_engine.base import ForgeDiffusionEngine, ForgeObjects
from backend.modules.k_prediction import PredictionFlux
from backend.patcher.clip import CLIP
from backend.patcher.unet import UnetPatcher
from backend.patcher.vae import VAE
from backend.text_processing.classic_engine import ClassicTextProcessingEngine
from backend.text_processing.t5_engine import T5TextProcessingEngine
class Flux(ForgeDiffusionEngine):
matched_guesses = [model_list.Flux, model_list.FluxSchnell]
def __init__(self, estimated_config, huggingface_components):
super().__init__(estimated_config, huggingface_components)
self.is_inpaint = False
clip = CLIP(model_dict={"clip_l": huggingface_components["text_encoder"], "t5xxl": huggingface_components["text_encoder_2"]}, tokenizer_dict={"clip_l": huggingface_components["tokenizer"], "t5xxl": huggingface_components["tokenizer_2"]})
vae = VAE(model=huggingface_components["vae"])
if "schnell" in estimated_config.huggingface_repo.lower():
k_predictor = PredictionFlux(mu=1.0)
else:
k_predictor = PredictionFlux(
seq_len=4096,
base_seq_len=256,
max_seq_len=4096,
base_shift=0.5,
max_shift=1.15,
)
self.use_distilled_cfg_scale = True
unet = UnetPatcher.from_model(model=huggingface_components["transformer"], diffusers_scheduler=None, k_predictor=k_predictor, config=estimated_config)
self.text_processing_engine_l = ClassicTextProcessingEngine(
text_encoder=clip.cond_stage_model.clip_l,
tokenizer=clip.tokenizer.clip_l,
embedding_dir=dynamic_args["embedding_dir"],
embedding_key="clip_l",
embedding_expected_shape=768,
text_projection=False,
minimal_clip_skip=1,
clip_skip=1,
return_pooled=True,
final_layer_norm=True,
)
self.text_processing_engine_t5 = T5TextProcessingEngine(
text_encoder=clip.cond_stage_model.t5xxl,
tokenizer=clip.tokenizer.t5xxl,
)
self.forge_objects = ForgeObjects(unet=unet, clip=clip, vae=vae, clipvision=None)
self.forge_objects_original = self.forge_objects.shallow_copy()
self.forge_objects_after_applying_lora = self.forge_objects.shallow_copy()
self.is_flux = True
self.ref_latents = []
def set_clip_skip(self, clip_skip):
self.text_processing_engine_l.clip_skip = clip_skip
@torch.inference_mode()
def get_learned_conditioning(self, prompt: "SdConditioning"):
memory_management.load_model_gpu(self.forge_objects.clip.patcher)
cond_l, pooled_l = self.text_processing_engine_l(prompt)
cond_t5 = self.text_processing_engine_t5(prompt)
cond = dict(crossattn=cond_t5, vector=pooled_l)
if self.use_distilled_cfg_scale:
distilled_cfg_scale = getattr(prompt, "distilled_cfg_scale", 3.5) or 3.5
cond["guidance"] = torch.FloatTensor([distilled_cfg_scale] * len(prompt))
print(f"Distilled CFG Scale: {distilled_cfg_scale}")
else:
print("Distilled CFG Scale is ignored for Schnell")
if not prompt.is_negative_prompt:
if dynamic_args["kontext"] and self.ref_latents:
dynamic_args["ref_latents"] = self.ref_latents.copy()
self.ref_latents.clear()
else:
dynamic_args["ref_latents"].clear()
self.ref_latents.clear()
return cond
@torch.inference_mode()
def get_prompt_lengths_on_ui(self, prompt):
token_count = len(self.text_processing_engine_t5.tokenize([prompt])[0])
return token_count, max(255, token_count)
@torch.inference_mode()
def encode_first_stage(self, x):
sample = self.forge_objects.vae.encode(x.movedim(1, -1) * 0.5 + 0.5)
sample = self.forge_objects.vae.first_stage_model.process_in(sample)
self.ref_latents.append(sample.cpu())
return sample.to(x)
@torch.inference_mode()
def decode_first_stage(self, x):
sample = self.forge_objects.vae.first_stage_model.process_out(x)
sample = self.forge_objects.vae.decode(sample).movedim(-1, 1) * 2.0 - 1.0
return sample.to(x)
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