Save python & library version metadata w/ pickled model

[Aylr]

Background

Pickling is dangerous because it assumes the exact environment when objects are deserialized from disk.

A real solution would be to save a model in an environmental agnostic way, such as JSON. This is nontrivial to do. Therefore, MVP first:

MVP

When a model is saved (as a pickled TrainedSupervisedModel), also save a .json (preferable) or .txt file describing the following:

• The python version
• The version of healthcare.ai
• The versions of all installed libraries (think pip freeze here)

Implementation Notes

• This file should have the same filename (except extension) as the saved model.

[Aylr]

This finally struck and caused me to lose 2-3 hours on client work.

[Aylr]

This is a small amount of work and the output from pip freeze and python --version should easily suffice.