* Create Audio Feature in SDK
* Add apis to record audio in SDK
* Add corresponding apis in pybind, storage.py, sdk.h
* Implement reservoir sampling when collecting audio samples

* fix clang format and update based on comment

* use int_8 for reading records and convert string directly from vector

* refract isSampleTaken to IndexOfSampleTaken

* fix clang format again

* Add manual Save feature.

* Fix the incorrect style

* Add feature to record Text

* Create a simple UI for text preview.

* Connect frontend with backend text data

* Move a constant from parameter to the body.
Remove test log

* Adjust the sync_cycle automatically.

* Change the multiplier type to double.

* Adjust the sync_period.

* Fix comment.

* Add the pre-commit

* Run pre-commit with other files.

* Only write the modified tablets to file system.
Move some functions definitions from headers to cc files.

* Persist the data in the destructor
Use unordered_set first.

* Use -1 for the unknown.

* Add Python 3 support

* Update protobuf to 3.5 and pybind to 2.2.2

* Update test scripts to use python -m

* Change zip/xrange/import usages

* Remove file generated by

* Graph viz set up (#282)

* Include the Graph requirement, GraphViz` in docs.

* Provide information to the ONNX format model export.

* Ask the user to download Graphviz via the website instead of brew.

* Make test and build scripts compatible with python 2 & 3

* A WITH_PYTHON3 option was added to cmake.

* setup.py will detect runing version python, and setup up WITH_PYTHON3 environemnt variable before calling build.sh

* build.sh and test.sh will handle WITH_PYTHON3

* Fix pybind warning

* Pass WITH_PYTHON3 correctly

* Fix coding style

* Add six for Python 2 and 3 Compatibility

* Fix coding style

* Binary Record Fixes

* Fixed issues with binary_record.h filename generator method.  std::hash is not consistent across OS.  It will generate different hash's when ran on different OS on the same string.  Change the filename generator to use a static counter.  It will be more ideal to use UUID generator available in boost 1.4.2, however, boost 1.4.2 has problems compiling on c++11 \n* Fix issue with pytorch demo where it logs to the absolute path /workspace

* Fix performance issue on server when server fails to load image file.  Currently server retries an API call 3 times before it fails, at which point it'll sleep the thread for 2 secs.  This becomes problematic when there are alot of SDK errors.  I'll create seperate issue to refine the retry logic to not be so expensive on the server.

* Add C++ and python style check to travis.  
* Update all C++/python code that violate coding standards.

avoid copy LogWriter

just a trick to store int8 in protobuf

should limit the maximum image shape latter

some time should wait between read service and get item