Model Formats

A trained model has to leave the notebook. The page first says why pickling a Python object is the wrong way to save it, then shows PMML as a format another application can read.

The default habit is pickle, and the case against it is Stop using pickle, use JSON or PMML, Elfao's argument to stop using pickle to save machine learning models.

PMML

Once pickle is off the table, PMML is an XML description of a model that other applications can read.

PMML: an XML file that describes a machine learning model that is transferable between applications. The specification's PMML page, PMML 4.3 - General Structure, sets out two rules. The structure of the models is described by an XML Schema, and one or more mining models can be contained in a PMML document.