1. A method for initializing a streaming application, the method including compiling code on a compiler system, the compiling of the code comprising: establishing an operator graph having a plurality of processing elements including a first processing element and a second processing element; receiving a first compiler directive specifying an operator sub-graph included in the operator graph, the operator sub-graph containing one or more processing elements from the plurality of processing elements, the operator sub-graph configured to receive an input tuple and configured to transmit an output tuple to the second processing element of the operator graph; and receiving a second compiler directive identifying the first processing element, the first processing element configured to bypass the operator sub-graph by transmitting a predicted output tuple to the second processing element in response to determining that a processing condition exists in the operator graph.