Python: Introduce NvidiaChatCompletion AI Connector

[soumilinandi]

Motivation and Context

This change adds chat completion support with structured output to the existing NVIDIA connector, enabling developers to use NVIDIA's chat models through Semantic Kernel while building conversational AI applications that require structured, validated responses. The connector will support more model types iteratively, with future PRs introducing VLM models and additional capabilities.

Description

• New Chat Completion Service:
  NvidiaChatCompletion: Chat completion service following same structure as other connectors

  • Extends existing NVIDIA embedding connector patterns and architecture
  • Custom logic for handling structured output specific to NVIDIA models

• Enhanced Configuration:
  NvidiaChatPromptExecutionSettings: Chat-specific settings following existing connector patterns

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

[soumilinandi]

@microsoft-github-policy-service agree company="NVIDIA"

[moonbox3]

Python Test Coverage Report •

File	Stmts	Miss	Cover	Missing
__init__.py	4	0	100%
connectors/ai/nvidia
__init__.py	5	0	100%
connectors/ai/nvidia/prompt_execution_settings
nvidia_prompt_execution_settings.py	42	0	100%
connectors/ai/nvidia/services
nvidia_chat_completion.py	124	31	75%	95–96, 129, 149, 172–174, 176–178, 181, 183–184, 186–190, 224–225, 227–231, 261, 276, 296, 298–300
nvidia_handler.py	63	2	96%	73, 108
nvidia_model_types.py	4	0	100%
nvidia_text_embedding.py	71	3	95%	71–72, 74
connectors/ai/nvidia/settings
nvidia_settings.py	9	0	100%
TOTAL	27288	4767	82%

Python Unit Test Overview

Tests	Skipped	Failures	Errors	Time
3747	22 💤	0 ❌	0 🔥	1m 39s ⏱️

[moonbox3]

Hi @soumilinandi, mypy is failing with a few errors, FYI: https://github.com/microsoft/semantic-kernel/actions/runs/17649725903/job/50177819907?pr=12952#step:6:8