Learning rate schedule

[ruimashita]

Change yaml filed name from learning_rate_setting to learning_rate_schedule, and change selection item's name more clearly.
Also refactoring blueoil/generate_lmnet_config.py and blueoil/templates/lmnet/classification.tpl.py and blueoil/templates/lmnet/classification.tpl.py to handle condition easily.

Motivation and Context

In order to easy understand setting yaml field and item name, changed these more clearly.

Description

• Change yaml filed name from learning_rate_setting to learning_rate_schedule
• Change selection item's name more clearly. from tune1, tune2, tune3, fixed to 2-step-decay, 3-step-decay, 3-step-decay-with-warmup, constant.
• Change test/config/make_yml_config.py and test/config/*.ymlaccordingly.
• Refactoring blueoil/generate_lmnet_config.py and blueoil/templates/lmnet/classification.tpl.py and blueoil/templates/lmnet/classification.tpl.py to handle condition easily.
• update document: https://deploy-preview-82--blueoil.netlify.com/usage/init.html

How has this been tested?

blueoil.sh init generated config files can blueoil.sh train, for each learning_rate_schedule.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature / Optimization (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[ruimashita]

@lm-jira @lm-konda
Please review, I changed the text more readable in ea8f63a

[lm-jira]

It's okay for me

[ruimashita]

@lm-konda @lm-jira
Thanks 👍