大语言模型-微调chatglm6b

使用lora微调chatglm6b

https://github.com/yuanzhoulvpi2017/zero_nlp/tree/main/simple_thu_chatglm6b

还是来自上一篇文章documentsearch的作者

thuglm

LLM部分的代码有三部分：模型配置，模型主体和模型量化

配置主要还是和数据、模型参数有关

class ChatGLMConfig(PretrainedConfig):
    r"""
    This is the configuration class to store the configuration of a [`~ChatGLMModel`].
    It is used to instantiate an ChatGLM model according to the specified arguments, defining the model
    architecture. Instantiating a configuration with the defaults will yield a similar configuration to that of
    the ChatGLM-6B [THUDM/ChatGLM-6B](https://huggingface.co/THUDM/chatglm-6b) architecture.
    Configuration objects inherit from  [`PretrainedConfig`] and can be used
    to control the model outputs. Read the documentation from  [`PretrainedConfig`]
    for more information.
    Args:
        vocab_size (`int`, *optional*, defaults to 150528):
            Vocabulary size of the ChatGLM-6B model. Defines the number of different tokens that can be represented by the
            `inputs_ids` passed when calling [`~ChatGLMModel`] or
            [`~TFChatGLMModel`].
        hidden_size (`int`, *optional*, defaults to 4096):
            Dimension of the encoder layers and the pooler layer.
        num_hidden_layers (`int`, *optional*, defaults to 28):
            Number of hidden layers in the Transformer encoder.
        num_attention_heads (`int`, *optional*, defaults to 32):
            Number of attention heads for each attention layer in the Transformer encoder.
        inner_hidden_size (`int`, *optional*, defaults to 16384):
            Dimension of the "intermediate" (i.e., feed-forward) layer in the Transformer encoder.
        max_sequence_length (`int`, *optional*, defaults to 512):
            The maximum sequence length that this model might ever be used with.
            Typically set this to something large just in case (e.g., 512 or 1024 or 2048).
        layernorm_epsilon (`float`, *optional*, defaults to 1e-5):
            The epsilon used by the layer normalization layers.
        use_cache (`bool`, *optional*, defaults to `True`):
            Whether the model should return the last key/values attentions (not used by all models).
        Example:
    ```python
    >>> from configuration_chatglm import ChatGLMConfig
    >>> from modeling_chatglm import ChatGLMModel
    >>> # Initializing a ChatGLM-6B THUDM/ChatGLM-6B style configuration
    >>> configuration = ChatGLMConfig()
    >>> # Initializing a model from the THUDM/ChatGLM-6B style configuration
    >>> model = ChatGLMModel(configuration)
    >>> # Accessing the model configuration
    >>> configuration = model.config
    ```
"""
    model_type = "chatglm"

    def __init__(
            self,
            vocab_size=150528,
            hidden_size=4096,
            num_layers=28,
            num_attention_heads=32,
            layernorm_epsilon=1e-5,
            use_cache=False,
            bos_token_id=150004,
            eos_token_id=150005,
            mask_token_id=150000,
            gmask_token_id=150001,
            pad_token_id=0,
            max_sequence_length=2048,
            inner_hidden_size=16384,
            position_encoding_2d=True,
            quantization_bit=0,
            pre_seq_len=None,
            prefix_projection=False,
            **kwargs
    ):
        self.num_layers = num_layers
        self.vocab_size = vocab_size
        self.hidden_size = hidden_size
        self.num_attention_heads = num_attention_heads
        self.max_sequence_length = max_sequence_length
        self.layernorm_epsilon = layernorm_epsilon
        self.inner_hidden_size = inner_hidden_size
        self.use_cache = use_cache
        self.bos_token_id = bos_token_id
        self.eos_token_id = eos_token_id
        self.pad_token_id = pad_token_id
        self.mask_token_id = mask_token_id
        self.gmask_token_id = gmask_token_id
        self.position_encoding_2d = position_encoding_2d
        self.quantization_bit = quantization_bit
        self.pre_seq_len = pre_seq_len
        self.prefix_projection = prefix_projection

        super().__init__(
            pad_token_id=pad_token_id,
            bos_token_id=bos_token_id,
            eos_token_id=eos_token_id,
            **kwargs
        )

模型部分基本和huggingface开源的gpt2类似

量化的代码主要是为了减少推理对硬件的要求，让更多人可以尝试。可以最后进行使用

finetune

• 数据使用汉语alpaca
• peft减少资源使用

model = AutoModel.from_pretrained(
    "yuanzhoulvpi/chatglm6b-dddd", trust_remote_code=True).half().cuda()

peft_config = LoraConfig(
    task_type=TaskType.CAUSAL_LM,
    inference_mode=False, r=8, lora_alpha=32, lora_dropout=0.1,
    # ['dense','dense_h_to_4h','dense_4h_to_h'] # 'query_key_value',
    target_modules=['query_key_value',],
)
model = get_peft_model(model, peft_config)

推理

model = AutoModel.from_pretrained(
    "yuanzhoulvpi/chatglm6b-dddd", trust_remote_code=True).half().cuda()

peft_config = LoraConfig(
    task_type=TaskType.CAUSAL_LM,
    inference_mode=False, r=8, lora_alpha=32, lora_dropout=0.1,
    target_modules=['query_key_value',],
)
model = get_peft_model(model, peft_config)

# 在这里加载lora模型，注意修改chekpoint
peft_path = "test004/checkpoint-100/chatglm-lora.pt"
model.load_state_dict(torch.load(peft_path), strict=False)
model.eval()

分布式模型

• https://github.com/yuanzhoulvpi2017/zero_nlp/tree/main/Chatglm6b_ModelParallel
• https://github.com/yuanzhoulvpi2017/zero_nlp/tree/main/Chatglm6b_ModelParallel_ptuning