apex/examples/README.md

This directory contains examples illustrating Apex mixed precision and distributed tools.

**Note for users of the pre-unification API**:
`deprecated_api` contains examples illustrating the old (pre-unified) APIs.  These APIs will be removed soon, and users are strongly encouraged to switch.  The separate mixed precision tools called `Amp` and `FP16_Optimizer` in the old API are exposed via different flags/optimization levels in the new API.