optionally enable export if not exported model provided

[eaidova]

What does this PR do?

Fixes # (issue)

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[ilya-lavrenov]

@echarlaix @AlexKoff88 @helena-intel could you please review and merge before next optimum release?

[AlexKoff88]

I don't have strong objections but I wonder if there is a more elegant way to do the same without introducing so much code that mostly duplicated Transformers logic. @echarlaix should know it better.

Also a test is required.

[echarlaix]

I don't have strong objections but I wonder if there is a more elegant way to do the same without introducing so much code that mostly duplicated Transformers logic. @echarlaix should know it better.

Also a test is required.

Yes I think we can simplify this by using find_files_matching_pattern like :

pattern = r"(.*)?openvino(.*)?\_model.xml"
ov_files = find_files_matching_pattern(
    model_name_or_path,
    pattern,
    subfolder=subfolder,
    use_auth_token=token,
    revision=revision,
)

export = len(ov_files) == 0

also used in https://github.com/huggingface/optimum-intel/pull/740 for the openvino pipelines