Throw Exception
(RapidMiner Studio Core)
Synopsis
This operator throws an exception every time it is executed.Description
The Throw Exception operator will throw an exception with an user-defined message as soon as it is executed. This will cause the process to fail. It can be useful if e. g. a certain result is equal to a failure.
Input
through (Data Table)Data delivered to this port will be passed to the output port without any modification. Whenever an input port gets occupied, two new input and output ports become available. The order remains the same. Data delivered at the first input port is available at the first output port. It's not necessary to connect this port, the exception will be thrown anyway.
Output
- through (Data Table)
Provides the data which was delivered at the corresponding input port without any changes. Whenever an input port gets occupied, two new input and output ports become available. The order remains the same. Data delivered at the first input port is available at the first output port. It's not necessary to connect this port, the exception will be thrown anyway.
Parameters
- messageThe error message that should be shown/logged is specified through this parameter. Range: string
Tutorial Processes
Throw exeption if no examples passed
The 'Iris' data set is loaded with the Retrieve operator. The Filter Examples operator is applied on the data and filters examples of the attribute a1 that have a value greater than 10.
The ExampleSet is passed on to a Branch operator. If there is at least one example, the data is passed on without changing. If there are zero examples, the Throw Exception operator makes the process fail with the entered message. Because the filter condition applies on no example of the data set, the process will fail i.e. the Throw Exeption operator will be executed.
