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@nv-guomingz nv-guomingz commented Aug 8, 2025

It's cherry-pick PR of #6619

Summary by CodeRabbit

  • Documentation
    • Added a new reference document detailing multimodal model support for key features, including CUDA Graph, Encoder IFB, KV Cache Reuse, and Chunked Prefill, for various models using the PyTorch backend.

@nv-guomingz nv-guomingz requested a review from a team as a code owner August 8, 2025 06:27
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coderabbitai bot commented Aug 8, 2025

📝 Walkthrough

Walkthrough

A new documentation file, "Multimodal Feature Support Matrix (PyTorch Backend)", has been added. This markdown document provides a table listing several multimodal models and indicates their support for specific features, such as CUDA Graph, Encoder IFB, KV Cache Reuse, and Chunked Prefill.

Changes

Cohort / File(s) Change Summary
New Multimodal Feature Support Matrix Doc
docs/source/reference/multimodal-feature-support-matrix.md
Added a markdown file documenting feature support (CUDA Graph, Encoder IFB, KV Cache Reuse, Chunked Prefill) for various multimodal models.

Sequence Diagram(s)

No sequence diagram generated as the change is documentation-only.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

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1.0_doc

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  • amukkara
  • brb-nv
  • yechank-nvidia
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@nv-guomingz
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/bot skip --comment "docs only change"

@nv-guomingz nv-guomingz enabled auto-merge (squash) August 8, 2025 06:30
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Actionable comments posted: 1

🔭 Outside diff range comments (1)
docs/source/reference/multimodal-feature-support-matrix.md (1)

1-14: Add the new matrix page to your docs navigation

Our checks show that multimodal-feature-support-matrix.md is not referenced by any toctree, so it won’t appear in the rendered docs. Please add it under the Reference section. For example:

• Create or update docs/source/reference/index.rst:

Reference
=========

.. toctree::
   :maxdepth: 1

   multimodal-feature-support-matrix

• Ensure your top-level docs/source/index.rst includes the Reference folder (if it doesn’t already):

.. toctree::
   :maxdepth: 2

   reference/index

These changes will make the multimodal feature support matrix reachable from your docs navigation.

🧹 Nitpick comments (4)
docs/source/reference/multimodal-feature-support-matrix.md (4)

1-2: Add a short scope note and recency to prevent misinterpretation and staleness.

Consider inserting a brief note under the title to clarify scope and when this was last validated:

 # Multimodal Feature Support Matrix (PyTorch Backend)
 
+> Note: This matrix covers the PyTorch backend only. "Yes" reflects support in shipped example recipes; "No" means not supported or not yet validated. Status last reviewed: 2025-08-08.

3-4: Expand acronym and align terminology (“CUDA Graphs”).

Use commonly adopted names and expand the acronym on first use:

-| Model              | CUDA Graph | Encoder IFB         | KV Cache Reuse | Chunked Prefill |
+| Model              | CUDA Graphs | Encoder IFB (Inflight Batching) | KV Cache Reuse | Chunked Prefill |
 | :----------------- | :--------- | :------------------ | :------------- | :-------------- |

3-13: Add a minimal legend to define each feature.

This avoids ambiguity for new readers:

 | Qwen2.5-VL         | Yes        | Yes                 | Yes            | No              |
 
+## Legend
+- CUDA Graphs: Using CUDA graph capture/replay to reduce kernel launch overhead.
+- Encoder IFB (Inflight Batching): Batching encoder/prefill work across requests to improve throughput/latency.
+- KV Cache Reuse: Reusing cached KV states across requests with identical prefixes/contexts.
+- Chunked Prefill: Splitting long prefill sequences into chunks for streaming/latency improvements.

3-13: Clarify what “No” means and when “N/A” should be used.

If some features are not applicable to a given model architecture (vs. simply not implemented/validated), consider either:

  • Adding a “Notes” column with brief caveats, or
  • Using “N/A” where the concept doesn’t apply, reserving “No” for unsupported/not yet validated.
📜 Review details

Configuration used: .coderabbit.yaml
Review profile: CHILL
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📥 Commits

Reviewing files that changed from the base of the PR and between 28b762a and 436b057.

📒 Files selected for processing (1)
  • docs/source/reference/multimodal-feature-support-matrix.md (1 hunks)
🔇 Additional comments (1)
docs/source/reference/multimodal-feature-support-matrix.md (1)

1-14: LGTM overall—useful snapshot for PyTorch backend.

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PR_Github #14577 [ skip ] triggered by Bot

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PR_Github #14577 [ skip ] completed with state SUCCESS
Skipping testing for commit 436b057

@nv-guomingz nv-guomingz merged commit 09038be into NVIDIA:release/1.0 Aug 8, 2025
5 checks passed
dominicshanshan pushed a commit to dominicshanshan/TensorRT-LLM that referenced this pull request Aug 19, 2025
dominicshanshan pushed a commit to dominicshanshan/TensorRT-LLM that referenced this pull request Aug 19, 2025
dominicshanshan pushed a commit to dominicshanshan/TensorRT-LLM that referenced this pull request Aug 20, 2025
dominicshanshan pushed a commit to dominicshanshan/TensorRT-LLM that referenced this pull request Aug 20, 2025
@nv-guomingz nv-guomingz deleted the user/guomingz/cherry-pick-6619 branch September 30, 2025 07:59
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4 participants