sgl-project/sglang

[Feature] Support encoder models for flash_infer backend

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#6,050 opened on May 6, 2025

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good first issue

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Description

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Motivation

          @DavidBao03 hi, currently only support encoder model with torch_native attn backend and triton attn backend. Other attn backend is not supported yet.

Originally posted by @woodx9 in https://github.com/sgl-project/sglang/issues/4887#issuecomment-2847365703

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Contributor guide

Research direction
Investigate how encoder models are supported in torch native and triton backends, then extend flash infer backend similarly.
Tech stack
pythonpytorch
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
3-5 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
PythonPyTorch
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50