Shiyunee/Honest-Qwen2.5-7B-Instruct

Introduction

This is the official repo of the paper Annotation-Efficient Universal Honesty Alignment

This repository provides modules that extend Qwen2.5-7B-Instruct with the ability to generate accurate confidence scores before response generation, indicating how likely the model is to answer a given question correctly across tasks. We offer two types of modules—LoRA + Linear Head and Linear Head—along with model parameters under three training settings:

1. Elicitation (greedy): Trained on all questions (over 560k) using self-consistency-based confidence annotations.
2. Calibration-Only (right): Trained on questions with explicit correctness annotations.
3. EliCal (hybrid): Initialized from the Elicitation model and further trained on correctness-labeled data.

For both Calibration-Only and EliCal settings, we provide models trained with different amounts of annotated data (1k, 2k, 3k, 5k, 8k, 10k, 20k, 30k, 50k, 80k, 200k, 560k+). Since LoRA + Linear Head is the main configuration used in our paper, the following description is based on this setup.

In our model, LoRA is applied to all linear layers with r = 8 and α = 16. The Linear Head is added to the final layer of the model and takes as input the internal state of the last token from the final layer. It predicts a confidence score between 0 and 1, representing the model’s estimated probability of answering the question correctly.

Model Architecture

class LMWithVectorHead(nn.Module):
    def __init__(self, model_name, lora_config, output_dim=1):
        super().__init__()
        backbone = AutoModel.from_pretrained(model_name, device_map='cpu')
        # backbone.config.use_cache = False
        self.peft_model = get_peft_model(backbone, lora_config)
        self.config = backbone.config
        hidden_size = backbone.config.hidden_size
        self.vector_head = nn.Linear(hidden_size, output_dim)  # 输出维度为 1

    def gradient_checkpointing_enable(self, gradient_checkpointing_kwargs=None):
        """启用梯度检查点，并处理可能的额外参数"""
        self.peft_model.enable_input_require_grads()
        if gradient_checkpointing_kwargs is not None:
            self.peft_model.gradient_checkpointing_enable(**gradient_checkpointing_kwargs)
        else:
            self.peft_model.gradient_checkpointing_enable()

    def forward(self, input_ids, attention_mask=None, labels=None):
        # if hasattr(self.peft_model, "gradient_checkpointing"):
        #     print(f"✅ 梯度检查点已启用 - 当前模式: {self.peft_model.is_gradient_checkpointing}")
        # else:
        #     print("❌ 梯度检查点未正确初始化")
        outputs = self.peft_model(
            input_ids=input_ids,
            attention_mask=attention_mask,
            return_dict=True
        )
        # 获取最后一个 token 的隐藏状态
        last_hidden = outputs.last_hidden_state  # [B, T, H]
        cls_hidden = last_hidden[:, -1, :]       # [B, H]
        logits = self.vector_head(cls_hidden)    # [B, 1]
        logits = torch.sigmoid(logits).squeeze(-1)  # 添加 sigmoid 并压缩至 [B]

        loss = None
        if labels is not None:
            loss_fct = nn.MSELoss()  # 使用 MSE 损失
            loss = loss_fct(logits, labels)  # 计算 logits 和 labels 的 MSE

        return CausalLMOutput(
            loss=loss,
            logits=logits
        )

Inference

This shows how to load the model. For more details, please refer to Github Repo.

base_model = AutoModel.from_pretrained(args.model_path)

    # 2. 加载训练好的LoRA适配器到基础模型上
    peft_model = PeftModel.from_pretrained(
        base_model,  # 使用基础模型，而不是model.peft_model
        args.lora_path,
        adapter_name="default"
    )

    # 3. 创建完整模型结构
    lora_config = LoraConfig(
        r=args.r,
        lora_alpha=args.alpha,
        target_modules=["q_proj", "k_proj", "v_proj", "o_proj",
                    "gate_proj", "up_proj", "down_proj"],
        lora_dropout=args.lora_dropout,
        bias="none",
    )
    model = LMWithVectorHead(args.model_path, lora_config)

    # 4. 替换为已加载LoRA的模型
    model.peft_model = peft_model

    # 5. 加载分类头权重
    state_dict = torch.load(args.vector_head_path, map_location=device)
    model.vector_head.load_state_dict(state_dict)

    # 6. 激活适配器并移动到设备
    model.peft_model.set_adapter("default")
    model = model.to(device)
    
    # 评估模式
    model.eval()

Files

/lora
├── greedy_answer_conf
│   └── long_qa
│       └── batchsize16_accumulation8_epochs10_weightdecay0.1_r8_alpha16_loradropout0.0  (training configuration)
│           ├── best_checkpoints
│           │   ├── lora_epoch_best/                # Path to LoRA module
│           │   └── vector_head_epoch_best.pt       # Path to Linear Head weights
│           └── test_losses.json                    # Test loss for each epoch
│
├── hybrid_answer_conf
│   └── long_qa
│      ├── batchsize16_accumulation8_epochs10_weightdecay0.1_r8_alpha16_loradropout0.0 (560k samples)
│       ├── batchsize16_accumulation8_epochs50_weightdecay0.1_r8_alpha16_loradropout0.0_1k_training_samples  (1k samples)
│       └── batchsize16_accumulation8_epochs50_weightdecay0.1_r8_alpha16_loradropout0.0_2k_training_samples  (2k samples)
│
└── right_answer_conf
    └── long_qa
        └── ...   # Same format as above

/mlp
...