vLLM: opt-in ReplaySSM decode for Gated DeltaNet (Qwen3.5 / Qwen3.6 / Qwen3-Next)

scripts/exec_literals_baseline.json

@@ -453,6 +453,20 @@
       "count": 1,
       "reason": "Executes that compiled torch_forward in the remote module's own namespace; the source is the already-trusted remote method with the two literal substitutions above."
     },
+    {
+      "file": "unsloth_zoo/vllm_gdn_replayssm.py",
+      "sink": "compile",
+      "digest": "9934852d2076b955",
+      "count": 1,
+      "reason": "vLLM's own installed method source (inspect.getsource), changed only by the fixed literal fragments in _LAYER_SOURCE_EDITS, each required to match exactly once; any mismatch returns None before compile, so no other text reaches exec."
+    },
+    {
+      "file": "unsloth_zoo/vllm_gdn_replayssm.py",
+      "sink": "exec",
+      "digest": "311123857fe38e74",
+      "count": 1,
+      "reason": "vLLM's own installed method source (inspect.getsource), changed only by the fixed literal fragments in _LAYER_SOURCE_EDITS, each required to match exactly once; any mismatch returns None before compile, so no other text reaches exec."
+    },
     {
       "file": "unsloth_zoo/vllm_utils.py",
       "sink": "eval",

tests/test_vendored_license_shipped.py

@@ -44,3 +44,11 @@ def test_embedded_text_matches_canonical_files():
     assert lic.FLA_LICENSE.strip() == _read("fla", "LICENSE").strip()
     assert lic.NOTICE.strip() == _read("NOTICE").strip()
     assert lic.FLA_MANIFEST.strip() == _read("fla", "MANIFEST").strip()
+
+
+def test_embedded_vllm_license_is_apache_and_matches():
+    lic = _load_licenses_module()
+    assert "Apache License" in lic.VLLM_LICENSE and "Version 2.0" in lic.VLLM_LICENSE
+    assert lic.VLLM_LICENSE.strip() == _read("vllm", "LICENSE").strip()
+    assert lic.VLLM_MANIFEST.strip() == _read("vllm", "MANIFEST").strip()
+    assert "vllm-project/vllm/pull/48792" in lic.NOTICE

tests/test_vllm_replayssm.py

@@ -27,7 +27,7 @@
 
 VLLM_UTILS = pathlib.Path(__file__).resolve().parents[1] / "unsloth_zoo" / "vllm_utils.py"
 TREE = ast.parse(VLLM_UTILS.read_text(encoding = "utf-8-sig"))
-CONSTANTS = ("_REPLAYSSM_MAMBA2_MODELS", "_REPLAYSSM_MODEL_TYPES")
+CONSTANTS = ("_REPLAYSSM_MAMBA2_MODELS", "_REPLAYSSM_GDN_MODEL_TYPES", "_REPLAYSSM_MODEL_TYPES")
 HELPERS = ("_vllm_replayssm_mode", "_vllm_replayssm_skip_reason", "_is_vllm_replayssm_refusal")
 
 
@@ -58,7 +58,7 @@ def test_nemotron_h_on_cuda_is_requested(nested):
 
 
 @pytest.mark.parametrize("config, keys, device, why", [
-    (_config("qwen3_next"), KEYS, "cuda", "model type"),
+    (_config("lfm2"), KEYS, "cuda", "model type"),
     (_config("llama"), KEYS, "cuda", "model type"),
     (_config("nemotron_h"), KEYS, "hip", "CUDA only"),
     (_config("nemotron_h"), KEYS, "xpu", "CUDA only"),
@@ -109,6 +109,7 @@ def test_requested_only_for_engines_load_vllm_builds():
     src = ast.get_source_segment(VLLM_UTILS.read_text(encoding = "utf-8-sig"), fn)
     assert "_vllm_replayssm_mode()" in src
     assert '"VLLM_USE_V2_MODEL_RUNNER" not in os.environ' in src
+    assert 'replayssm_mode == "auto" and replayssm_type in _REPLAYSSM_GDN_MODEL_TYPES' in src
 
 
 # Drift guards against the installed vLLM, run whenever it has the engine arg load_vllm keys on.

unsloth_zoo/_vendored/NOTICE

@@ -26,3 +26,19 @@ flash-linear-attention (fla-core)
   gated-deltanet models get the Triton kernels without an extra
   `pip install flash-linear-attention`. Package __init__ exports were narrowed;
   all other files retain their original upstream MIT headers verbatim.
+
+--------------------------------------------------------------------------------
+vLLM (Gated DeltaNet ReplaySSM decode kernel)
+--------------------------------------------------------------------------------
+  Source:    https://github.com/vllm-project/vllm/pull/48792
+  Commit:    ccd8197ae9818607cb7e904ffbb83a7ce0fe31fa
+  License:   Apache-2.0
+  Copyright: Copyright contributors to the vLLM project
+  Location:  unsloth_zoo/_vendored/vllm/
+  License text + provenance: unsloth_zoo/_vendored/vllm/LICENSE and
+                             unsloth_zoo/_vendored/vllm/MANIFEST
+                             (also embedded verbatim in the shipped module
+                             unsloth_zoo/_vendored/_licenses.py).
+
+  One Triton kernel file (gdn_replayssm_decode.py), with its launch-config lookup
+  inlined; see the MANIFEST for the exact change.

unsloth_zoo/_vendored/_licenses.py

@@ -81,6 +81,22 @@
   gated-deltanet models get the Triton kernels without an extra
   `pip install flash-linear-attention`. Package __init__ exports were narrowed;
   all other files retain their original upstream MIT headers verbatim.
+
+--------------------------------------------------------------------------------
+vLLM (Gated DeltaNet ReplaySSM decode kernel)
+--------------------------------------------------------------------------------
+  Source:    https://github.com/vllm-project/vllm/pull/48792
+  Commit:    ccd8197ae9818607cb7e904ffbb83a7ce0fe31fa
+  License:   Apache-2.0
+  Copyright: Copyright contributors to the vLLM project
+  Location:  unsloth_zoo/_vendored/vllm/
+  License text + provenance: unsloth_zoo/_vendored/vllm/LICENSE and
+                             unsloth_zoo/_vendored/vllm/MANIFEST
+                             (also embedded verbatim in the shipped module
+                             unsloth_zoo/_vendored/_licenses.py).
+
+  One Triton kernel file (gdn_replayssm_decode.py), with its launch-config lookup
+  inlined; see the MANIFEST for the exact change.
 """
 
 # fla-core snapshot provenance, verbatim from unsloth_zoo/_vendored/fla/MANIFEST.
@@ -276,4 +292,243 @@
 vendored_by = Unsloth (unsloth_zoo/_vendored/fla)
 """
 
-__all__ = ["FLA_LICENSE", "NOTICE", "FLA_MANIFEST"]
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+
+# Provenance, verbatim from unsloth_zoo/_vendored/vllm/MANIFEST.
+VLLM_MANIFEST = """name = vLLM
+pull_request = https://github.com/vllm-project/vllm/pull/48792
+commit = ccd8197ae9818607cb7e904ffbb83a7ce0fe31fa (refs/pull/48792/head)
+upstream = https://github.com/vllm-project/vllm
+license = Apache-2.0
+license_file = LICENSE
+copyright = Copyright contributors to the vLLM project
+
+description =
+    The Gated DeltaNet ReplaySSM standard-decode Triton kernel from vLLM PR
+    #48792 ("ReplaySSM: cache SSM inputs for faster Gated DeltaNet standard
+    decode"), which closed unmerged when its fork was deleted. Released vLLM ships
+    ReplaySSM for Mamba2 only; unsloth_zoo.vllm_gdn_replayssm backports the GDN
+    path onto released vLLM at runtime and launches this kernel.
+
+exported_api =
+    gdn_replayssm_decode.fused_recurrent_gated_delta_rule_replayssm
+
+modifications =
+    - gdn_replayssm_decode.py is vllm/third_party/flash_linear_attention/ops/
+      fused_recurrent_replayssm.py from the commit above with one change, marked
+      "Modified by Unsloth": the launch-config lookup imported from
+      vllm.model_executor.layers.mamba.ops.replayssm_config is inlined (released
+      vLLM has no "gdn_decode" entry), with the same values as the PR, and the
+      kernel imports triton directly instead of vllm.triton_utils.
+    - The runtime integration (state page, metadata builder, layer dispatch) is
+      Unsloth's own code in unsloth_zoo/vllm_gdn_replayssm.py, ported from the
+      same PR.
+
+file_count = 1 python module + __init__.py + this MANIFEST + LICENSE
+
+vendored_by = Unsloth (unsloth_zoo/_vendored/vllm)
+"""
+
+__all__ = ["FLA_LICENSE", "NOTICE", "FLA_MANIFEST", "VLLM_LICENSE", "VLLM_MANIFEST"]