[Sync] [Enhancement] Simplify execution logic in run.py; use finally to clean up temp files #337
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Motivation
The former logic in run.py is rather complex when user chooses to specify task parameters from CLI instead of config - it uses "exec_xxx_runner" and makes the entire execution flow diverge from the configuration path. Such an implementation makes it hard for future maintenance and leads to unnecessary code redundancies.
This PR unifies the execution flow and now all the parameter specifications are performed through the modifications on the configuration object.
Besides, this PR uses
try... finally...
to make sure temporary files created during running can be cleaned even when an exception has been raised (e.g. KeyBoardInterrupt).