Zombie Detector. ImportError: cannot import name 'LossScaleOptimizerV1'

Hi

When I try to execute colab for Zombie Detector Assignment, the following line:

from object_detection.builders import model_builder

generates an error:

“ImportError: cannot import name ‘LossScaleOptimizerV1’ from ‘keras.mixed_precision.loss_scale_optimizer’ (/usr/local/lib/python3.7/dist-packages/keras/mixed_precision/loss_scale_optimizer.py)”

Any help with this issue?

Thanks

I’ve solved by restarting the notebook kernel