Increase text length from 256 to 1024 in Qwen-Image

[ChangyiYang]

Motivation

Reated issue: #16132

Diffusers set max token length as 1024
https://github.com/huggingface/diffusers/blob/1cdb8723b85f1b427031e390e0bd0bebfe92454e/src/diffusers/pipelines/qwenimage/pipeline_qwenimage.py#L175
increse it to align with diffusers.

Thanks to Yuhao to point this out!

Modifications

set max token length for Qwen-Image from 256 to 1024

Accuracy Tests

Max Length 256 will make model to fail in long prompt, now model can correctly follow long prompt word.

Benchmarking and Profiling

Checklist

• Format your code according to the Format code with pre-commit.
• Add unit tests according to the Run and add unit tests.
• Update documentation according to Write documentations.
• Provide accuracy and speed benchmark results according to Test the accuracy and Benchmark the speed.
• Follow the SGLang code style guidance.

Review Process

1. Ping Merge Oncalls to start the PR flow. See the PR Merge Process.
2. Get approvals from CODEOWNERS and other reviewers.
3. Trigger CI tests with comments (/tag-run-ci-label, /rerun-failed-ci, /tag-and-rerun-ci) or contact authorized users to do so.
4. After green CI and required approvals, ask Merge Oncalls to merge.

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[mickqian]

/tag-and-rerun-ci

[mickqian]

brilliant!