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app.py

@@ -1,3 +1,26 @@
+# ---------------------------------------------------------------------------
+# Force-upgrade transformers to >=5.1.0 before any other import.
+#
+# Why: PP-DocLayoutV3's custom model classes (PPDocLayoutV3ImageProcessor,
+# PPDocLayoutV3ForObjectDetection) were added to the transformers library in
+# version 5.1.0.  docling-ibm-models caps transformers<5.0.0 (conservative
+# pinning), so pip resolves transformers ~4.x at build time.  We upgrade it
+# here at runtime, before any docling/transformers import, so the correct
+# classes are available.  docling-ibm-models' usage (AutoModel, pipeline API)
+# remains compatible with transformers 5.x.
+# ---------------------------------------------------------------------------
+import subprocess
+import sys
+
+subprocess.run(
+    [
+        sys.executable, "-m", "pip", "install",
+        "transformers>=5.1.0",
+        "--quiet",
+    ],
+    check=True,
+)
+
 # ---------------------------------------------------------------------------
 # Plugin registration
 # ---------------------------------------------------------------------------

requirements.txt

@@ -1,6 +1,10 @@
 # docling-pp-doc-layout is bundled as a local package (docling_pp_doc_layout/)
 # because its PyPI releases require Python >=3.12 and ZeroGPU runs Python 3.10.
-# Its dependencies are listed here directly instead.
+# Its dependencies are listed here directly.
+#
+# transformers is intentionally NOT pinned here.  docling-ibm-models caps it
+# at <5.0.0, so pip resolves ~4.x at build time.  app.py then force-upgrades
+# to >=5.1.0 at runtime (before any imports) because PP-DocLayoutV3's custom
+# classes were added to transformers in 5.1.0.
 docling>=2.73
-transformers
 spaces