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/picture_description_api_model.py

@@ -1,13 +1,18 @@
 import base64
 import io
 import logging
-from typing import Iterable, List, Optional
+from pathlib import Path
+from typing import Iterable, List, Optional, Type, Union
 
 import requests
 from PIL import Image
 from pydantic import BaseModel, ConfigDict
 
-from docling.datamodel.pipeline_options import PictureDescriptionApiOptions
+from docling.datamodel.pipeline_options import (
+    AcceleratorOptions,
+    PictureDescriptionApiOptions,
+    PictureDescriptionBaseOptions,
+)
 from docling.exceptions import OperationNotAllowed
 from docling.models.picture_description_base_model import PictureDescriptionBaseModel
 
@@ -46,13 +51,25 @@ class ApiResponse(BaseModel):
 class PictureDescriptionApiModel(PictureDescriptionBaseModel):
     # elements_batch_size = 4
 
+    @classmethod
+    def get_options_type(cls) -> Type[PictureDescriptionBaseOptions]:
+        return PictureDescriptionApiOptions
+
     def __init__(
         self,
         enabled: bool,
         enable_remote_services: bool,
+        artifacts_path: Optional[Union[Path, str]],
         options: PictureDescriptionApiOptions,
+        accelerator_options: AcceleratorOptions,
     ):
-        super().__init__(enabled=enabled, options=options)
+        super().__init__(
+            enabled=enabled,
+            enable_remote_services=enable_remote_services,
+            artifacts_path=artifacts_path,
+            options=options,
+            accelerator_options=accelerator_options,
+        )
         self.options: PictureDescriptionApiOptions
 
         if self.enabled: