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Transforms for computing the arithmetic mean of the elements in a collection, or the mean of the values associated with each key in a collection of key-value pairs.


In the following example, we create a pipeline with a PCollection. Then, we get the element with the average value in different ways.

Example 1: Mean of element in a PCollection

We use Mean.Globally() to get the average of the elements from the entire PCollection.

Example 2: Mean of elements for each key

We use Mean.PerKey() to get the average of the elements for each unique key in a PCollection of key-values.

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