A computing system transforms variable values in a dataset using a transformation flow definition applied in parallel. The transformation flow definition indicates flow variables and transformation phases to apply to the flow variables. A computation is defined for each variable and for each transformation phase. A phase internal parameter value is computed for each defined computation from observation vectors read from the dataset. A current variable, a first variable value, a first transformation phase, the phase internal parameter value, and a current transformation phase are selected based on an observation vector read from the dataset. A result value is computed by executing the transformation function with the phase internal parameter value and the first variable value. The computed result value is output to a transformed input dataset. The process is repeated for each variable, transformation phase, and observation vector.