Set default value for image_tag parameter to "2025-05-08"

[Copilot]

The image_tag parameter in AzureOpenAIPythonGrader now defaults to "2025-05-08" instead of None, making it optional for users while maintaining backward compatibility.

Changes

• azure/ai/evaluation/_aoai/python_grader.py: Set image_tag default to "2025-05-08" and updated docstring type annotation to Optional[str]
• tests/unittests/test_aoai_python_grader.py: Added test case verifying instantiation without explicit image_tag

Usage

Before (required parameter):

grader = AzureOpenAIPythonGrader(
    model_config=config,
    name="custom_accuracy",
    image_tag="2025-05-08",  # Required
    pass_threshold=0.8,
    source=source_code,
)

After (optional with default):

grader = AzureOpenAIPythonGrader(
    model_config=config,
    name="custom_accuracy",
    pass_threshold=0.8,
    source=source_code,  # image_tag defaults to "2025-05-08"
)

Original prompt

https://github.com/nagkumar91/azure-sdk-for-python/blob/main/sdk/evaluation/azure-ai-evaluation/azure/ai/evaluation/_aoai/python_grader.py#L66

make the image_tag have a default value "2025-05-08"

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