* Improve TFX Taxi Sample and Components.
- Confusion matrix and ROC components support flexible target.
- Use single mode instead of 4 different modes for TFDV, TFMA, TFT, Predicton.
- TFDV output's schema path directly.
- Add Confusion Matrix and ROC components to tf taxi sample.
* Follow up code review comments.
* migrate from the old repo
* fix bug: accidentally override tfma test
* add tfma test back
* add tfma back
* typo fix
* fix small typo
* if job fails, exit after logs are output