InferHub: Design and Implementation of a Unified Multimodal AI Inference Platform

Title: InferHub: Design and Implementation of a Unified Multimodal AI Inference Platform Abstract: A production-oriented multimodal AI inference platform that uniformly exposes large language models, speech recognition, speech synthesis, and vision capabilities via a FastAPI gateway, supporting streaming transmission, observability, and model canary release. Original Author/Maintainer: hasan-raja Source: GitHub Original Link: https://github.com/hasan-raja/InferHub Release Time: 2026-05-27

InferHub aims to solve the fragmentation of AI inference services by providing a unified platform for managing LLM, ASR, TTS, and Vision capabilities with features like low-latency APIs, streaming support, observability, and model rollout controls.

With the rapid development of LLM, ASR, TTS, and computer vision technologies, enterprises face challenges in unified management and efficient deployment of these capabilities. Current market has various independent AI service providers (OpenAI GPT, Google Gemini, open-source Llama, Whisper etc.), leading to:

• Complex multi-vendor management (different API formats, authentication, rate limits)
• Difficulty in optimizing latency and cost (no intelligent routing)
• Lack of observability (hard to monitor performance across services)
• Gray release difficulties (needs extensive code changes for new models)

InferHub is built to address these issues.

InferHub uses a layered architecture:

1. API Gateway Layer (FastAPI): Unified entry point for request routing, authentication, rate limiting, and protocol adaptation (follows OpenAPI specification).
2. Model Registry: Manages model metadata, versions, gray release/A/B testing, and health monitoring.
3. gRPC Workers: Executes inference tasks with high performance (HTTP/2, streaming support, strong typing via Protobuf).
4. Storage & Message Layer: Integrates PostgreSQL (user data, configs), Redis (cache), ClickHouse (metrics), Kafka (async tasks).

InferHub integrates multiple AI capabilities:

• LLM: Supports cloud APIs (OpenAI, Anthropic, Google), local deployment (vLLM, TGI), and hybrid mode; OpenAI-compatible API.
• ASR: Real-time streaming recognition, multi-language support, speaker separation.
• TTS: High-quality synthesis with multiple voices, emotion control, streaming output.
• Vision: Image description, visual QA, image generation (text-to-image, image-to-image).

Key features of InferHub:

• Low Latency: Connection pool management, smart batching, caching, edge deployment.
• Streaming: Token-level streaming via SSE/WebSocket, unified gateway protection.
• Observability: Metrics collection (latency, throughput), distributed tracing, log aggregation, alerts.
• Model Management: Canary release, A/B testing, auto-rollback, shadow testing.

Phase Development:

• Phase1: Basic infrastructure (FastAPI gateway, config system, dependencies, Docker Compose).
• Phase2: Security & governance (auth, rate limits, model registry).
• Phase3: Worker nodes (gRPC services, Groq integration).
• Phase4: Client APIs (inference APIs, WebSocket support).

Deployment: Local deployment via Docker Compose; for production, it is recommended to use Kubernetes (service discovery, auto-scaling).

InferHub applies to:

1. Smart Customer Service: Integrates ASR (voice input), LLM (intent understanding), TTS (voice output) for end-to-end service.
2. Content Creation: Single API access to text/image/voice generation for multimedia content.
3. Enterprise Knowledge Assistant: Private model deployment with observability and safe model updates.

Current Limitations:

• Limited integration with MLOps tools (MLflow, Kubeflow).
• Incomplete multi-tenant support (isolation, billing).
• Edge node optimization needs improvement.

Future Plans:

• Support more model formats (ONNX, TensorRT).
• Model quantization for cost reduction.
• Federated learning support.
• Model market for community sharing.