* add backend code for hidi v2

* add VISUALDL_RUN_PREFIX

* fix review

* simplify logi
Co-authored-by: Nwuzewu <wuzewu@baidu.com>

* rename pages to remove trailing 's'

* feat: navbar support dropdown menu

* feat: audio sample page

* chore: update dependencies

* style: fix lint

* v2.0.0-beta.46

* chore: fix import method

* v2.0.0-beta.47

* chore: remove unused code

* v2.0.0-beta.48

* fix: navbar submenu overflow when hover

* v2.0.0-beta.49

* Add pr curve.

* Add --model to parameters.

* Add histogram, add hdfs.

* * Support starting vdl in python.

* Fix null point error.

* Add introduction to python startup method in README.md.

* Fix blank picture cause of scalar null response.

Fix backend data transfer perf issues

* remove unnecessary fields

* performance: add cache to images

* performance: add debounce to step slider

* v2.0.0-beta.16

* style: better type reference

* fix: better implementation of revalidation & minor bug fix

* v2.0.0-beta.17

* feat: chinese translation adaptive

* fix: select height limitation

* chore: better error handling on revalidation

* v2.0.0-beta.18

* v2.0.0-beta.12

* v2.0.0-beta.13

* fix: use new development server

* v2.0.0-beta.14

* build: build frontend from npm tarball

* fix: update python setup

* Use a more light weight method to get PCA and T-SNE. Update embedding documentations. Update loading animation

* Reveal the embedding tab

* Add the auto reload. and fix typos

* Update comments

* Limit embedding tag name to be embedding only

* display the runs to the user, so they can pick which embedding to see

* The server now loads run parameter.

* Remove the need of passing a tag name to embedding log writer and reader.

* Remove un-needed fetch

* Use first item in the list

* rename showingRun to selectedRun

* Add license to the top of files

* Add licenses agreement on the demo files

* Complete audio data integration:
* Add num channels, sample width, sample rate as params
* Generate audio file with proper params

* clang format

* Audio integration to front end
* Add flask end point
* Read and decode audio data

* refract a typo

* fix clang format

* Make the frontend to fetch the data from the flask server.

* Provide loading animation.

* Fixed format style
Fix the issue where the display label not working.

* Provide a 2D 3D switcher.
Display the chart in 3D.

* Include PCA method to do dimension reduction

* Fix the style.

* Fix typo
Use === to compare type as well.

* 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

* 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

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

* fix

* fix lib