If you familiar with Tensorflow, you can refer Tensorflow Object Detection API`

you can find the architecture and implementation in the below codes,

https://github.com/tensorflow/models/blob/master/research/object_detection/meta_architectures/faster_rcnn_meta_arch.py

With feature extractors in implementation https://github.com/tensorflow/models/tree/master/research/object_detection/models

Hope it helps.

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