* Add `dump_to_file()` for ProgrameDescBind in pybind

* Update

* Add utility.py

* typo

* Fix bugs

* Move add_feed/fetch_components to untility.py

* Compelete dump

* Follow comments

* Change output of Prune() from inference to pointer

* Expose Prune() to Python

* Compelete save/load API of inference model

* Fix errors

* Debuging

* Compelete unit tests

* follow comments

Batch norm latest

* Add debug logs in scope, meta_cache and memory

* Add missing deps

Comment out `test_lstm_unit_op` test.

Add merge model scripts

Add pool2d cudnn op

* fix compile error

* remove unittest

* disable huber loss unittest

add logs and fix a python path bug

refine check macro

add Max strategy for sequence_pool op

Add huber loss operator.

Auc op

fix ft job converge

* Adding L1 norm op for L1 regularization

* Addressing code review feedback

* Address code review feedback

* Change variable names to match google style guide