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Converting a .pb file to NCS graph

Hi,
I was using Darkflow to detect multiple objects from a video. I used a model trained on the COCO dataset (yolo.coco.cfg and yolo.coco.weights).
I successfully converted this model to a protobuf .pb file to be used with Tensorflow using:

flow --model cfg/yolo.coco.cfg --load bin/yolo.coco.weights --savepb

I got two files yolo.coco.pb and yolo.coco.meta
And this is working fine and I was able to load this model in to Tensorflow and run detections.
Now, I am trying to convert this .pb file to a frozen graph to be used with NCS. But looks like it needs a checkpoint file.
Since I am using pre-trained weights, I don't have the checkpoint file with me.

How can I convert this .pb file to be used with NCS?
Is it necessary that I train the model?

I'm a bit new to this, so please forgive any mistakes.

Thanks

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