Port to TF 2#10

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karishnu wants to merge 3 commits intoaqeelanwar:masterfrom

karishnu:master

Commits on May 21, 2020

Update label_map_util.py file for new create_category_index_from_labelmap method
karishnu
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Use saved model instead of frozen graph (depreciated), Use get_file utility to handle model download, Use new create_category_index_from_labelmap util method
karishnu
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Make changes to support new backbone
karishnu
committed