[XPU] Disable test_ngram_corpus on XPU and detect XPU tests dynamically in CI filter

.github/workflows/pr-test-xpu.yml

@@ -28,8 +28,8 @@ jobs:
   check-changes:
     runs-on: ubuntu-latest
     outputs:
-      changes_exist: ${{ steps.filter.outputs.main_package == 'true' || steps.filter.outputs.multimodal_gen == 'true' || steps.run-mode.outputs.run_all_tests == 'true' }}
-      main_package: ${{ steps.filter.outputs.main_package == 'true' || steps.run-mode.outputs.run_all_tests == 'true' }}
+      changes_exist: ${{ steps.filter.outputs.main_package == 'true' || steps.filter.outputs.multimodal_gen == 'true' || steps.xpu-tests.outputs.changed == 'true' || steps.run-mode.outputs.run_all_tests == 'true' }}
+      main_package: ${{ steps.filter.outputs.main_package == 'true' || steps.xpu-tests.outputs.changed == 'true' || steps.run-mode.outputs.run_all_tests == 'true' }}
       multimodal_gen: ${{ steps.filter.outputs.multimodal_gen == 'true' || steps.run-mode.outputs.run_all_tests == 'true' }}
     steps:
       - name: Checkout code
@@ -54,9 +54,13 @@ jobs:
         uses: dorny/paths-filter@v3
         if: steps.run-mode.outputs.run_all_tests != 'true'
         with:
+          list-files: json
           filters: |
+            # Baseline list below; any other changed test/registered/ file with a
+            # per-commit register_xpu_ci is also picked up by the next step.
+            registered_tests:
+              - "test/registered/**/*.py"
             main_package:
-              # Extend test/registered/ entries when adding a non-nightly register_xpu_ci.
               - "python/sglang/!(multimodal_gen|kernels|cli|test)/**/!(*.md)"
               - "python/sglang/test/*.py"
               - "python/sglang/test/!(ascend|observability|mock_model|manual|external_models|kernels)/**/!(*.md)"
@@ -107,6 +111,13 @@ jobs:
               - "docker/xpu.Dockerfile"
               - "scripts/ci/xpu/**"
 
+      - name: Detect changed per-commit XPU tests
+        id: xpu-tests
+        if: steps.filter.outputs.registered_tests == 'true'
+        env:
+          CHANGED_FILES: ${{ steps.filter.outputs.registered_tests_files }}
+        run: echo "changed=$(python3 scripts/ci/xpu/detect_xpu_test_changes.py)" >> "$GITHUB_OUTPUT"
+
   # ==================== PR Gate ==================== #
   pr-gate:
     needs: check-changes

scripts/ci/xpu/detect_xpu_test_changes.py

@@ -0,0 +1,51 @@
+"""Decide whether changed test files need per-commit XPU CI.
+
+Reads a JSON list of changed paths (dorny/paths-filter `list-files: json`)
+from the CHANGED_FILES env var or argv[1], and prints `true` if any of them
+carries a non-nightly `register_xpu_ci`, else `false`.
+"""
+
+import json
+import os
+import sys
+from pathlib import Path
+
+REPO_ROOT = Path(__file__).resolve().parents[3]
+
+# ci_register.py is stdlib-only; import it directly (bypassing the sglang
+# package __init__, which pulls in torch) so this runs on ubuntu-latest.
+sys.path.insert(0, str(REPO_ROOT / "python" / "sglang" / "test" / "ci"))
+
+from ci_register import HWBackend, ut_parse_one_file  # noqa: E402
+
+
+def xpu_per_commit_files(paths):
+    hits = []
+    for rel in paths:
+        path = REPO_ROOT / rel
+        # Deleted files cannot be parsed; the job no longer runs them anyway.
+        if path.suffix != ".py" or not path.is_file():
+            continue
+        try:
+            registries, _ = ut_parse_one_file(str(path))
+        except (SyntaxError, ValueError) as e:
+            # Unparsable test file: run XPU CI so run_suite surfaces the error.
+            print(f"::warning::{rel}: {e}", file=sys.stderr)
+            hits.append(rel)
+            continue
+        if any(r.backend == HWBackend.XPU and not r.nightly for r in registries):
+            hits.append(rel)
+    return hits
+
+
+def main():
+    raw = sys.argv[1] if len(sys.argv) > 1 else os.environ.get("CHANGED_FILES", "")
+    paths = json.loads(raw) if raw.strip() else []
+    hits = xpu_per_commit_files(paths)
+    for rel in hits:
+        print(f"XPU per-commit test changed: {rel}", file=sys.stderr)
+    print("true" if hits else "false")
+
+
+if __name__ == "__main__":
+    main()