[CI] Add PR/Issue Auto Labeler

.github/labeler.yml

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+# https://github.com/actions/labeler
+pipelines:
+    - changed-files:
+        - any-glob-to-any-file:
+            - src/diffusers/pipelines/**
+
+models:
+    - changed-files:
+        - any-glob-to-any-file:
+            - src/diffusers/models/**
+
+schedulers:
+    - changed-files:
+        - any-glob-to-any-file:
+            - src/diffusers/schedulers/**
+
+single-file:
+    - changed-files:
+        - any-glob-to-any-file:
+            - src/diffusers/loaders/single_file.py
+            - src/diffusers/loaders/single_file_model.py
+            - src/diffusers/loaders/single_file_utils.py
+
+ip-adapter:
+    - changed-files:
+        - any-glob-to-any-file:
+            - src/diffusers/loaders/ip_adapter.py
+
+lora:
+    - changed-files:
+        - any-glob-to-any-file:
+            - src/diffusers/loaders/lora_base.py
+            - src/diffusers/loaders/lora_conversion_utils.py
+            - src/diffusers/loaders/lora_pipeline.py
+            - src/diffusers/loaders/peft.py
+
+loaders:
+    - changed-files:
+        - any-glob-to-any-file:
+            - src/diffusers/loaders/textual_inversion.py
+            - src/diffusers/loaders/transformer_flux.py
+            - src/diffusers/loaders/transformer_sd3.py
+            - src/diffusers/loaders/unet.py
+            - src/diffusers/loaders/unet_loader_utils.py
+            - src/diffusers/loaders/utils.py
+            - src/diffusers/loaders/__init__.py
+
+quantization:
+    - changed-files:
+        - any-glob-to-any-file:
+            - src/diffusers/quantizers/**
+
+hooks:
+    - changed-files:
+        - any-glob-to-any-file:
+            - src/diffusers/hooks/**
+
+guiders:
+    - changed-files:
+        - any-glob-to-any-file:
+            - src/diffusers/guiders/**
+
+modular-pipelines:
+    - changed-files:
+        - any-glob-to-any-file:
+            - src/diffusers/modular_pipelines/**
+
+experimental:
+    - changed-files:
+        - any-glob-to-any-file:
+            - src/diffusers/experimental/**
+
+documentation:
+    - changed-files:
+        - any-glob-to-any-file:
+            - docs/**
+
+tests:
+    - changed-files:
+        - any-glob-to-any-file:
+            - tests/**
+
+examples:
+    - changed-files:
+        - any-glob-to-any-file:
+            - examples/**
+
+CI:
+    - changed-files:
+        - any-glob-to-any-file:
+            - .github/**
+
+utils:
+    - changed-files:
+        - any-glob-to-any-file:
+            - src/diffusers/utils/**
+            - src/diffusers/commands/**

.github/workflows/issue_labeler.yml

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+name: Issue Labeler
+
+on:
+  issues:
+    types: [opened]
+
+permissions:
+  contents: read
+  issues: write
+
+jobs:
+  label:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+      - name: Install dependencies
+        run: pip install huggingface_hub
+      - name: Get labels from LLM
+        id: get-labels
+        env:
+          HF_TOKEN: ${{ secrets.HF_TOKEN }}
+          ISSUE_TITLE: ${{ github.event.issue.title }}
+          ISSUE_BODY: ${{ github.event.issue.body }}
+        run: |
+          LABELS=$(python utils/label_issues.py)
+          echo "labels=$LABELS" >> "$GITHUB_OUTPUT"
+      - name: Apply labels
+        if: steps.get-labels.outputs.labels != ''
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          ISSUE_NUMBER: ${{ github.event.issue.number }}
+          LABELS: ${{ steps.get-labels.outputs.labels }}
+        run: |
+          for label in $(echo "$LABELS" | python -c "import json,sys; print('\n'.join(json.load(sys.stdin)))"); do
+            gh issue edit "$ISSUE_NUMBER" --add-label "$label"
+          done

.github/workflows/pr_labeler.yml

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+name: PR Labeler
+
+on:
+  pull_request_target:
+    types: [opened, synchronize, reopened]
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  label:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/labeler@8558fd74291d67161a8a78ce36a881fa63b766a9  # v5
+        with:
+          sync-labels: true
+
+  missing-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+      - name: Check for missing tests
+        id: check
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+          REPO: ${{ github.repository }}
+        run: |
+          gh api --paginate "repos/${REPO}/pulls/${PR_NUMBER}/files" \
+            | python utils/check_test_missing.py
+      - name: Add or remove missing-tests label
+        if: always()
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+        run: |
+          if [ "${{ steps.check.outcome }}" = "failure" ]; then
+            gh pr edit "$PR_NUMBER" --add-label "missing-tests"
+          else
+            gh pr edit "$PR_NUMBER" --remove-label "missing-tests" 2>/dev/null || true
+          fi
+
+  size-label:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Label PR by diff size
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+          REPO: ${{ github.repository }}
+        run: |
+          DIFF_SIZE=$(gh api "repos/${REPO}/pulls/${PR_NUMBER}" --jq '.additions + .deletions')
+          for label in size/S size/M size/L; do
+            gh pr edit "$PR_NUMBER" --repo "$REPO" --remove-label "$label" 2>/dev/null || true
+          done
+          if [ "$DIFF_SIZE" -lt 50 ]; then
+            gh pr edit "$PR_NUMBER" --repo "$REPO" --add-label "size/S"
+          elif [ "$DIFF_SIZE" -lt 200 ]; then
+            gh pr edit "$PR_NUMBER" --repo "$REPO" --add-label "size/M"
+          else
+            gh pr edit "$PR_NUMBER" --repo "$REPO" --add-label "size/L"
+          fi

utils/check_test_missing.py

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+import ast
+import json
+import sys
+
+
+SRC_DIRS = ["src/diffusers/pipelines/", "src/diffusers/models/", "src/diffusers/schedulers/"]
+MIXIN_BASES = {"ModelMixin", "SchedulerMixin", "DiffusionPipeline"}
+
+
+def extract_classes_from_file(filepath: str) -> list[str]:
+    with open(filepath) as f:
+        tree = ast.parse(f.read())
+
+    classes = []
+    for node in ast.walk(tree):
+        if not isinstance(node, ast.ClassDef):
+            continue
+        base_names = set()
+        for base in node.bases:
+            if isinstance(base, ast.Name):
+                base_names.add(base.id)
+            elif isinstance(base, ast.Attribute):
+                base_names.add(base.attr)
+        if base_names & MIXIN_BASES:
+            classes.append(node.name)
+
+    return classes
+
+
+def extract_imports_from_file(filepath: str) -> set[str]:
+    with open(filepath) as f:
+        tree = ast.parse(f.read())
+
+    names = set()
+    for node in ast.walk(tree):
+        if isinstance(node, ast.ImportFrom):
+            for alias in node.names:
+                names.add(alias.name)
+        elif isinstance(node, ast.Import):
+            for alias in node.names:
+                names.add(alias.name.split(".")[-1])
+
+    return names
+
+
+def main():
+    pr_files = json.load(sys.stdin)
+
+    new_classes = []
+    for f in pr_files:
+        if f["status"] != "added" or not f["filename"].endswith(".py"):
+            continue
+        if not any(f["filename"].startswith(d) for d in SRC_DIRS):
+            continue
+        try:
+            new_classes.extend(extract_classes_from_file(f["filename"]))
+        except (FileNotFoundError, SyntaxError):
+            continue
+
+    if not new_classes:
+        sys.exit(0)
+
+    new_test_files = [
+        f["filename"]
+        for f in pr_files
+        if f["status"] == "added" and f["filename"].startswith("tests/") and f["filename"].endswith(".py")
+    ]
+
+    imported_names = set()
+    for filepath in new_test_files:
+        try:
+            imported_names |= extract_imports_from_file(filepath)
+        except (FileNotFoundError, SyntaxError):
+            continue
+
+    untested = [cls for cls in new_classes if cls not in imported_names]
+
+    if untested:
+        print(f"missing-tests: {', '.join(untested)}")
+        sys.exit(1)
+    else:
+        sys.exit(0)
+
+
+if __name__ == "__main__":
+    main()