load_quantized_int8.py

"""
Quick loader for INT8 quantized HunyuanImage-3.0 model.
Generated automatically by hunyuan_quantize_int8.py
"""

import torch
from transformers import AutoModelForCausalLM, BitsAndBytesConfig

def load_quantized_hunyuan_int8(model_path="H:\Testing\HunyuanImage-3-INT8-v2"):
    """Load the INT8 quantized HunyuanImage-3.0 model."""
    
    quant_config = BitsAndBytesConfig(
        load_in_8bit=True,
        llm_int8_threshold=6.0,
    )
    
    model = AutoModelForCausalLM.from_pretrained(
        model_path,
        quantization_config=quant_config,
        device_map="auto",  # Distribute across GPU/CPU as needed
        trust_remote_code=True,
        torch_dtype=torch.bfloat16,
        attn_implementation="sdpa",
    )
    
    # Load tokenizer
    model.load_tokenizer(model_path)
    
    return model

if __name__ == "__main__":
    print("Loading INT8 quantized model...")
    model = load_quantized_hunyuan_int8()
    print("Model loaded successfully!")
    print(f"Device map: {model.hf_device_map}")
    
    # Check memory usage
    if torch.cuda.is_available():
        print(f"GPU memory allocated: {torch.cuda.memory_allocated() / 1024**3:.2f} GB")
        print(f"GPU memory reserved: {torch.cuda.memory_reserved() / 1024**3:.2f} GB")