AzureOpenAIModelConfiguration should not require an api key, instead support OAuth2

[flomader]

Is your feature request related to a problem? Please describe.
For example, azure.ai.evaluation.RelevanceEvaluator cannot be used without a key.

model_config = {
"azure_endpoint": os.environ.get("AZURE_OPENAI_ENDPOINT"),
"api_key": os.environ.get("AZURE_OPENAI_API_KEY"),
"azure_deployment": os.environ.get("AZURE_OPENAI_DEPLOYMENT"),
}

relevance_evaluator = RelevanceEvaluator(model_config)

Describe the solution you'd like
Like for example the AzureOpenAI client (https://learn.microsoft.com/en-us/azure/ai-services/openai/how-to/managed-identity#chat-completions) an azure_ad_token_provider should also be possible to use for authentication.

[kashifkhan]

Thank you for the feedback @flomader . We will investigate and get back to you asap.

[github-actions]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @luigiw @needuv @singankit.

[singankit]

Thanks @flomader for reaching out. If api-key is not passed as part of model config, DefaultAzureCredentials is used. Please give a try and share you feedback.

[github-actions]

Hi @flomader. Thank you for opening this issue and giving us the opportunity to assist. To help our team better understand your issue and the details of your scenario please provide a response to the question asked above or the information requested above. This will help us more accurately address your issue.

[flomader]

@singankit using for example the RelevanceEvaluator without a key fails:

from azure.ai.evaluation import RelevanceEvaluator

model_config = {
    "azure_endpoint": os.environ.get("AZURE_OPENAI_ENDPOINT"),
    "azure_deployment": os.environ.get("AZURE_OPENAI_DEPLOYMENT"),
}

relevance_evaluator = RelevanceEvaluator(model_config)
result = relevance_evaluator(
    query="What is the capital of Japan?",
    response="The capital of Japan is Tokyo."
)

EvaluationException: (UserError) Model config validation failed.

Looks like there is a validation here and api_key is not an optional property.