import random


def SampleAdIDs(IDs):
    """
    Samples 200 random IDs to benchmark.
    """
    AllAdIDs = []
    IDsToTest = set()
    print(len(IDs))
    while len(IDsToTest) < 200:
      IDsToTest.add(random.randrange(0, len(IDs)))
    
    return [IDs[i] for i in IDsToTest]