out_scale/grads_have_scale，ZeroDivisionError: float division by zero

[chengzhen123]

Traceback (most recent call last): File "train.py", line 202, in lr=args.lr, device=device, img_scale=args.scale, val_percent=args.val / 100) File "train.py", line 95, in train_net scaled_loss.backward() File "D:\ProgramData\Anaconda3\envs\UNet3plus\lib\contextlib.py", line 119, in exit next(self.gen) File "D:\ProgramData\Anaconda3\envs\UNet3plus\lib\site-packages\apex\amp\handle.py", line 123, in scale_loss optimizer._post_amp_backward(loss_scaler) File "D:\ProgramData\Anaconda3\envs\UNet3plus\lib\site-packages\apex\amp_process_optimizer.py", line 249, in post_backward_no_master_weights post_backward_models_are_masters(scaler, params, stashed_grads) File "D:\ProgramData\Anaconda3\envs\UNet3plus\lib\site-packages\apex\amp_process_optimizer.py", line 135, in post_backward_models_are_masters scale_override=(grads_have_scale, stashed_have_scale, out_scale)) File "D:\ProgramData\Anaconda3\envs\UNet3plus\lib\site-packages\apex\amp\scaler.py", line 183, in unscale_with_stashed out_scale/grads_have_scale, ZeroDivisionError: float division by zero

epochs跑到2次，就报这个错误，查到网上说将lr改小一个等级，就可以。我把lr从0.01 改成 0.001，到了26epoch又报这个错误。 请问，是否有其他方法消除这个错误？以及这个错误由什么引起的？谢谢