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def run(event, context):
    """
    Sample code of a cloud function entrypoint that is called when a message
    is published to a topic. This is run when there is a notification on a prefix 
    in cloud storage.
    
    The message (event) contains the path to the objectId invoking the message.
    """
    
    event_filename = event["attributes"]["objectId"]

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BUCKET="gs://<your-bucket-name>"
TOPIC="projects/<your-project-id>/topics/<your-topic>"
PREFIX="your-prefix-path"

gsutil notification create \
  -f json \ 
  -t $TOPIC \
  -e OBJECT_FINALIZE \
  -p $PREFIX \
  $BUCKET

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"""
author: Timothy C. Arlen
date: 28 Feb 2018

Calculate Mean Average Precision (mAP) for a set of bounding boxes corresponding to specific
image Ids. Usage:

> python calculate_mean_ap.py

Will display a plot of precision vs recall curves at 10 distinct IoU thresholds as well as output