Add ADK model handler

[damccorm]

Adds model handler capable of running ADK agents mid-pipeline.

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new ModelHandler for Apache Beam's ML Inference library, specifically designed to integrate with the Google Agent Development Kit (ADK). This integration allows users to embed sophisticated AI agents, such as large language model agents, directly into their Beam data processing pipelines. The handler manages agent lifecycle and conversation sessions, providing flexibility for various interaction patterns.

Highlights

• New ADKAgentModelHandler: Introduced ADKAgentModelHandler to enable running Google Agent Development Kit (ADK) agents within Beam pipelines using the RunInference transform.
• Flexible Agent Instantiation: Implemented support for providing ADK agents either as direct instances or as zero-argument factory callables, accommodating unpicklable agent states.
• Session Management: Designed session management within the handler to support both stateless (unique session per element) and stateful (shared session_id for multi-turn conversations) agent interactions.
• Comprehensive Unit Tests: Included comprehensive unit tests for ADKAgentModelHandler covering initialization, model loading, inference execution, and session handling.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 68 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.75%. Comparing base (0afbdf6) to head (633e08a).
⚠️ Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
.../apache_beam/ml/inference/agent_development_kit.py	0.00%	68 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             master   #37917    +/-   ##
==========================================
  Coverage     54.75%   54.75%            
  Complexity     1690     1690            
==========================================
  Files          1063     1064     +1     
  Lines        166898   167111   +213     
  Branches       1226     1226            
==========================================
+ Hits          91377    91505   +128     
- Misses        73328    73413    +85     
  Partials       2193     2193            

Flag	Coverage Δ
python	80.02% <0.00%> (-0.06%)	⬇️

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[github-actions]

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[damccorm]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces the ADKAgentModelHandler to enable running Google Agent Development Kit (ADK) agents within Apache Beam's RunInference transform. This includes a new Python module for the handler, comprehensive unit tests, and updates to setup.py to include the google-adk dependency. Feedback suggests improving performance by using asyncio.gather for concurrent agent invocations instead of repeated asyncio.run calls, and addressing an import consistency issue in the test file.

[damccorm]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces the ADKAgentModelHandler to enable running Google Agent Development Kit (ADK) agents within Apache Beam's RunInference transform. This includes the core implementation, a dedicated test file, and updates to dependencies and the CHANGES.md file. Feedback indicates a critical bug where model.session_service.create_session will raise a SessionExistsError for elements beyond the first when a shared session_id is used, requiring a try...except block. Additionally, the response extraction in _invoke_agent should be improved to handle multi-part agent responses completely by using event.content.text instead of event.content.parts[0].text.

[damccorm]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces the ADKAgentModelHandler to integrate Google Agent Development Kit (ADK) agents with Apache Beam's RunInference transform, allowing users to run ADK agents within Beam pipelines. This involves adding a new Python module, corresponding unit tests, updating the CHANGES.md file, and adding google-adk as a dependency in setup.py. A review comment highlighted a bug where SessionExistsError is used in the new handler without being imported, which could lead to a NameError.

[damccorm]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces ADKAgentModelHandler for running Google Agent Development Kit (ADK) agents within Apache Beam's RunInference transform, along with corresponding unit tests. It also adds google-adk as a dependency. A critical issue was identified where the sessions module was used without being imported, which would lead to a NameError at runtime.

[Ganeshsivakumar]

Really exciting PR. This could be like Flink Agents of Beam.