* Fix the iter error when the number of GPUs is different during resume
* Add fromstring and unit test
* Remove is_pretty_text
* Fix comment
* Add log info
* Add py format check
* Remove SyntaxError check
* Allow to replace nested tuple and list via options
* Add comments
* Fix single nested items
* Simplify the code
* Simplify the code
* Simplify the code
* Simplify the code
* Update docstring
* Update docstring
* Support quotation mark
* modify docstring
* import_modules_from_strings when loading cfg from file
* add unittest to tell whether the feature is enabled as expected
* minor
* set an environment variable instead of writing a file
* use 'shutil' instead of 'os.system'