dspy.Image allows gs://image_urls from Google Cloud Platform (GCP)

[dimroc]

Allows dspy.Image to have a gs url that gets passed through and correctly ingested by LiteLLM.

Code Pointer to LiteLLM usage: https://github.com/BerriAI/litellm/blob/e9b7059af4d0aa0ad3da418628f34c1bd02251fa/litellm/llms/vertex_ai/gemini/transformation.py#L72

Example usage:

class GsImageUrl(dspy.Signature):
    """Extract the leadership principles."""

    image: dspy.Image = dspy.InputField(desc="image of page")
    leadership_principles: list[str] = dspy.OutputField(desc="list of leadership principles")

module = dspy.Predict(GsImageUrl)
image_url = "gs://some_bucket/AmazonLeadershipPrinciplesPage1.png"
image = dspy.Image.from_url(image_url, False)
response = module(image=image)

print(response.leadership_principles)

Output:

['Customer Obsession', 'Ownership', 'Invent and Simplify', 'Are Right, A Lot', 'Learn and Be Curious', 'Hire and Develop the Best', 'Insist on the Highest Standards']

MLFlow input/output:

[chenmoneygithub]

Thanks for the PR! LGTM