feat: add factory for ocr engines via plugins (#1010)

* add factory for ocr engines

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* apply pre-commit after rebase

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* add picture description factory

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* fix enable option

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* switch to create methods

Signed-off-by: Panos Vagenas <pva@zurich.ibm.com>

* make `options` an explicit kwarg

Signed-off-by: Panos Vagenas <pva@zurich.ibm.com>

* keep old lock of docling-core

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* fix lock

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* add allow_external_plugins option

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* add factory return and ignore options type

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

---------

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>
Signed-off-by: Panos Vagenas <pva@zurich.ibm.com>
Co-authored-by: Panos Vagenas <pva@zurich.ibm.com>

docling/models/factories/__init__.py

@@ -0,0 +1,27 @@
+import logging
+from functools import lru_cache
+
+from docling.models.factories.ocr_factory import OcrFactory
+from docling.models.factories.picture_description_factory import (
+    PictureDescriptionFactory,
+)
+
+logger = logging.getLogger(__name__)
+
+
+@lru_cache()
+def get_ocr_factory(allow_external_plugins: bool = False) -> OcrFactory:
+    factory = OcrFactory()
+    factory.load_from_plugins(allow_external_plugins=allow_external_plugins)
+    logger.info("Registered ocr engines: %r", factory.registered_kind)
+    return factory
+
+
+@lru_cache()
+def get_picture_description_factory(
+    allow_external_plugins: bool = False,
+) -> PictureDescriptionFactory:
+    factory = PictureDescriptionFactory()
+    factory.load_from_plugins(allow_external_plugins=allow_external_plugins)
+    logger.info("Registered picture descriptions: %r", factory.registered_kind)
+    return factory