Help!!! How to save the current training checkpoint in colab

[ZFbaby]

When I use colab to run the following code for training

model = object_detector.ObjectDetector.create(
train_data=train_data,
validation_data=validation_data,
options=options)

When colab runs for more than 12 hours, all the data is cleared and training can no longer continue. Can anyone help me save the training progress so that I can continue training at the original progress next time? Is there any relevant code for reference? I haven't found an effective solution yet....