[IMG292] Fix issue related to unsorted list from generator

Zhang, Chenrequested to merge
IMG292_fix_path_issue_in_loading into next

Original Gitlab story: IMG292

This PR fixes the following issues related to data loading:

  • max_worker is not properly passed from parameterized function to private function during function call.
  • the file list from generator is not ordered, therefore additional sorting step is added to ensure the list is ordered.

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