Add fp16 to keras benchmarks (#6314)
Add fp16 to keras benchmarks (#6314)


tombstone/models,alexgorban/models,tombstone/models,derekjchow/models,alexgorban/models,alexgorban/models,derekjchow/models,derekjchow/models,derekjchow/models,tombstone/models,alexgorban/models,alexgorban/models,tombstone/models,tombstone/models,derekjchow/models,tombstone/models