title: Combining Java and Python in Apache Beam pipeline
body: <p>Is it possible to combine Java and Python transforms in Apache Beam? </p>
  
  <p>Here is the use case (i.e. dream plan): the raw input data has very high rate, and so some initial aggregation is needed in a reasonably fast language (e.g. Java). The aggregated values are then given to a few transforms (implemented in Python) and then passed through a stack of machine learning models (implemented in Python) to produce some predictions, which will then be utilized again in some Java code.</p>
  
  <p>Is it possible in Apache Beam?</p>
  
  <p>Thank you very much for your help!</p>