from typing import Optional

import torch
from .configuration_chatglm import ChatGLMConfig
from .modeling_chatglm import ChatGLMForConditionalGeneration

from ..base import Actor


class ChatGLMActor(Actor):
    """
    ChatGLM Actor model.

    Args:
        pretrained (str): Pretrained model name or path.
        config (ChatGLMConfig): Model config.
        checkpoint (bool): Enable gradient checkpointing.

    do not support lora for now.
    """

    def __init__(self,
                 pretrained: str = None,
                 config: Optional[ChatGLMConfig] = None,
                 checkpoint: bool = False) -> None:
        if pretrained is not None:
            model = ChatGLMForConditionalGeneration.from_pretrained(pretrained)
        elif config is not None:
            model = ChatGLMForConditionalGeneration(config)
        else:
            model = ChatGLMForConditionalGeneration(ChatGLMConfig())
        if checkpoint:
            model.gradient_checkpointing_enable()
        super().__init__(model, lora_rank=0, lora_train_bias='none')
