emu3 / image_generation.py
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# -*- coding: utf-8 -*-
from PIL import Image
from transformers import AutoTokenizer, AutoModel, AutoImageProcessor, AutoModelForCausalLM
from transformers.generation.configuration_utils import GenerationConfig
from transformers.generation import LogitsProcessorList, PrefixConstrainedLogitsProcessor, UnbatchedClassifierFreeGuidanceLogitsProcessor
import torch
from emu3.mllm.processing_emu3 import Emu3Processor
# model path
EMU_HUB = "BAAI/Emu3-Gen"
VQ_HUB = "BAAI/Emu3-VisionTokenizer"
# prepare model and processor
model = AutoModelForCausalLM.from_pretrained(
EMU_HUB,
device_map="cuda:0",
torch_dtype=torch.bfloat16,
attn_implementation="flash_attention_2",
trust_remote_code=True,
)
tokenizer = AutoTokenizer.from_pretrained(EMU_HUB, trust_remote_code=True)
image_processor = AutoImageProcessor.from_pretrained(VQ_HUB, trust_remote_code=True)
image_tokenizer = AutoModel.from_pretrained(VQ_HUB, device_map="cuda:0", trust_remote_code=True).eval()
processor = Emu3Processor(image_processor, image_tokenizer, tokenizer)
# prepare input
POSITIVE_PROMPT = " masterpiece, film grained, best quality."
NEGATIVE_PROMPT = "lowres, bad anatomy, bad hands, text, error, missing fingers, extra digit, fewer digits, cropped, worst quality, low quality, normal quality, jpeg artifacts, signature, watermark, username, blurry."
classifier_free_guidance = 3.0
prompt = "a portrait of young girl."
prompt += POSITIVE_PROMPT
kwargs = dict(
mode='G',
ratio="1:1",
image_area=model.config.image_area,
return_tensors="pt",
)
pos_inputs = processor(text=prompt, **kwargs)
neg_inputs = processor(text=NEGATIVE_PROMPT, **kwargs)
# prepare hyper parameters
GENERATION_CONFIG = GenerationConfig(
use_cache=True,
eos_token_id=model.config.eos_token_id,
pad_token_id=model.config.pad_token_id,
max_new_tokens=40960,
do_sample=True,
top_k=2048,
)
h, w = pos_inputs.image_size[0]
constrained_fn = processor.build_prefix_constrained_fn(h, w)
logits_processor = LogitsProcessorList([
UnbatchedClassifierFreeGuidanceLogitsProcessor(
classifier_free_guidance,
model,
unconditional_ids=neg_inputs.input_ids.to("cuda:0"),
),
PrefixConstrainedLogitsProcessor(
constrained_fn ,
num_beams=1,
),
])
# generate
outputs = model.generate(
pos_inputs.input_ids.to("cuda:0"),
GENERATION_CONFIG,
logits_processor=logits_processor
)
mm_list = processor.decode(outputs[0])
for idx, im in enumerate(mm_list):
if not isinstance(im, Image.Image):
continue
im.save(f"result_{idx}.png")