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Principle:Haotian liu LLaVA Gradio Web Interface

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Overview

Web-based user interface pattern for interactive multimodal chat with image upload and streaming responses.

Description

The Gradio web interface provides a browser-based chat UI for interacting with LLaVA models. It serves as the user-facing frontend in the distributed controller-worker architecture.

Key capabilities:

  • Controller integration -- Connects to the controller to discover available models and route inference requests.
  • Image upload -- Users can upload images directly in the chat interface for visual question answering.
  • Streaming responses -- Responses stream in real-time using server-sent events (SSE), providing immediate feedback.
  • Multi-turn conversation -- Supports multi-turn dialogue with image context maintained across turns.
  • Model selection -- A dropdown menu allows users to select from all models available across registered workers.
  • Configurable generation parameters -- Sliders for temperature, max output tokens, and top-p sampling.
  • Response quality feedback -- Upvote, downvote, and flag buttons allow users to rate response quality for data collection.

Usage

Deploy as the user-facing frontend for the LLaVA demo. The Gradio web server requires:

  • A running controller (to discover workers and route requests)
  • At least one running model worker (to serve inference requests)

The typical deployment order is:

  1. Start the controller
  2. Start one or more model workers
  3. Start the Gradio web server

Theoretical Basis

The UI follows a server-sent event (SSE) streaming pattern:

  1. The user submits a message (with optional image).
  2. http_bot() sends a POST request to the controller's /worker_generate_stream endpoint.
  3. The controller proxies the request to a selected worker.
  4. The worker generates tokens and streams them back.
  5. http_bot() yields partial responses as they arrive, updating the chat display in real-time.

Image transport: Images are base64-encoded for HTTP transport between the Gradio frontend and the controller/worker backend.

Metadata

Field Value
Knowledge Sources Repo - LLaVA - https://github.com/haotian-liu/LLaVA
Domains Web_Interface, Model_Serving
Last Updated 2026-02-13 14:00 GMT

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