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# Copyright (c) OpenMMLab. All rights reserved.
from typing import Optional
import torch
from mmengine.hooks import Hook
from mmengine.runner import Runner
from mmdet.registry import HOOKS
@HOOKS.register_module()
class CheckInvalidLossHook(Hook):
"""Check invalid loss hook.
This hook will regularly check whether the loss is valid
during training.
Args:
interval (int): Checking interval (every k iterations).
Default: 50.
"""
def __init__(self, interval: int = 50) -> None:
self.interval = interval
def after_train_iter(self,
runner: Runner,
batch_idx: int,
data_batch: Optional[dict] = None,
outputs: Optional[dict] = None) -> None:
"""Regularly check whether the loss is valid every n iterations.
Args:
runner (:obj:`Runner`): The runner of the training process.
batch_idx (int): The index of the current batch in the train loop.
data_batch (dict, Optional): Data from dataloader.
Defaults to None.
outputs (dict, Optional): Outputs from model. Defaults to None.
"""
if self.every_n_train_iters(runner, self.interval):
assert torch.isfinite(outputs['loss']), \
runner.logger.info('loss become infinite or NaN!')
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