Add check existence of coco/train2017 before attemp to download (lar…

[alexander-sony]

…ge) dataset file

Pull Request Description:

fix #1194

Checklist before requesting a review:

• I set the appropriate labels on the pull request.
• I have added/updated the release note draft (if necessary).
• I have updated the documentation to reflect my changes (if necessary).
• All function and files are well documented.
• All function and classes have type hints.
• There is a licenses in all file.
• The function and variable names are informative.
• I have checked for code duplications.
• I have added new unittest (if necessary).

[alexander-sony]

@Idan-BenAmi now i see that several tutorials with GPTQ are downloading without first check existance of train dataset folder - i could update them as well in this PR - what do you say?

[Idan-BenAmi]

Thanks @alexander-sony