chromium/third_party/coremltools/mlmodel/format/README.rst

==================================
Core ML Model Format Specification
==================================

This directory contains the protobuf message definitions 
that comprise the Core ML model document (``.mlmodel``) format.

The top-level message is ``Model``, which is defined in ``Model.proto``.
Other message types describe data structures, feature types, 
feature engineering model types, and predictive model types.