"""Load Hydra BitNet model."""
import torch
from safetensors.torch import load_file

def load_hydra(model_path: str, device: str = "cpu"):
    """Load Hydra model from HuggingFace format."""
    import sys
    from pathlib import Path
    
    # Add aisim to path if needed
    aisim_path = Path(__file__).parent.parent / "aisim"
    if aisim_path.exists():
        sys.path.insert(0, str(aisim_path))
    
    from bitnet_moe import M2MSentinel
    import json
    
    # Load config
    with open(f"{model_path}/config.json") as f:
        config = json.load(f)
    
    # Create model
    model = M2MSentinel(
        vocab_size=config["vocab_size"],
        dim=config["hidden_size"],
        depth=config["num_hidden_layers"],
        experts=config["num_experts"],
    )
    
    # Load weights
    weights = load_file(f"{model_path}/model.safetensors")
    model.load_state_dict(weights)
    model = model.to(device)
    model.eval()
    
    return model, config

if __name__ == "__main__":
    import sys
    model_path = sys.argv[1] if len(sys.argv) > 1 else "."
    model, config = load_hydra(model_path)
    print(f"Loaded model: {config}")