To enable the probabilistic processing you have to include the probabilistic feature and use the probabilistic metadata (#METADATA Probabilistic) in your Odysseus script.
Estimating probabilistic values
The EM operator allows the fit a Gaussian mixture model (GMM) with predefined number of mixtures to the values of a data stream.
The Kalman Filter operator can be used if the variance of of the values in the data stream is known from some datasheet.
Filtering probabilistic values