def mean(numerator, denominator=1.):
    variable = numerator / denominator
    variable.tag.aggregation_scheme = Mean(numerator, denominator)
    variable.name = numerator.name
    return variable
Returns true if the photo has been unshared by the posting user,
dataset/ETHPy150Open rizar/attention-lvcsr/libs/blocks/blocks/monitoring/aggregation.py/mean--crossover with--dataset/ETHPy150Open viewfinderco/viewfinder/backend/db/post.py/Post.IsUnshared