[Feature] Phi-4-MM support

[lifuhuang]

Update

Currently we have added text & vision support.

Repeated MMMU benchmark runs range between 53.6 - 55.5, consistent with the the benchmark reported in the original paper (55).

Known limitations: (See Execution Plan before for full list):

1. Audio capabilities: currently we do not support audio at all.
2. LoRA / Image quality: Phi4MM depends on LoRA for full image capability, but there is some compatibility issues with the native SGL LORA solution. We are working on solving it by refactoring / generalizing SGL LoRA capabilities. Fixed with Refactor LoRA handling to support adapter tensors in fused format #6585, Fix incorrect LoRA weight loading for fused gate_up_proj #6734, Support LoRA in TestOpenAIVisionServer and fix fused kv_proj loading bug. #6861)
3. Token: Phi4MM supports two types of image token conventions (<|image1|> and <|endoftext10|>), currently we only support the latter. If you use the default chat template, it will automatically pick up the supported one.

Motivation

Supporting the Phi4 Multimodal model (https://huggingface.co/microsoft/Phi-4-multimodal-instruct in SGL.

Execution Plan:

• Basic text + image support (@lifuhuang Support Phi-4 Multi-Modal (text + vision only) #6494 )
• LoRA support (required for full image understanding capability): (@lifuhuang Refactor LoRA handling to support adapter tensors in fused format #6585 , Fix incorrect LoRA weight loading for fused gate_up_proj #6734 , Support LoRA in TestOpenAIVisionServer and fix fused kv_proj loading bug. #6861 )
• perf optimization (@lifuhuang Speed up set_lora_info by eliminating unnecessary H2D transfers #6960 [Perf] Refactor LoRAManager to eliminate stream syncs and redundant computations  #6994)
• SGLang LoRA compatibility with Radix Attention (@Fridge003 [WIP] Enable radix cache for Lora feature #7216 )
• (low priority) Precomputed feature support.
• (low priority) Refactor SGL MM processor logic support for support the original token variable image token (e.g., <image_1>)
• (low priority) audio support

Related resources

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