from colossalai.trainer.hooks import BaseHook
from colossalai.core import global_context as gpc
from colossalai.context import ParallelMode
from colossalai.logging import get_dist_logger


class TotalBatchsizeHook(BaseHook):
    def __init__(self, priority: int = 2) -> None:
        super().__init__(priority)
        self.logger = get_dist_logger()

    def before_train(self, trainer):
        total_batch_size = gpc.config.BATCH_SIZE * \
            gpc.config.gradient_accumulation * gpc.get_world_size(ParallelMode.DATA)
        self.logger.info(f'Total batch size = {total_batch_size}', ranks=[0])
