feat: Describe pictures using vision models (#259)

* draft for picture description models

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

* vlm description using AutoModelForVision2Seq

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

* add generation options

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

* update vlm API

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

* allow only localhost traffic

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

* rename model

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

* do not run with vlm api

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

* more renaming

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

* fix examples path

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

* apply CLI download login

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

* fix name of cli argument

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

* use with_smolvlm in models download

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

---------

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

docling/models/base_model.py

@@ -1,7 +1,7 @@
 from abc import ABC, abstractmethod
 from typing import Any, Generic, Iterable, Optional
 
-from docling_core.types.doc import BoundingBox, DoclingDocument, NodeItem, TextItem
+from docling_core.types.doc import BoundingBox, DocItem, DoclingDocument, NodeItem
 from typing_extensions import TypeVar
 
 from docling.datamodel.base_models import ItemAndImageEnrichmentElement, Page
@@ -64,7 +64,7 @@ class BaseItemAndImageEnrichmentModel(
         if not self.is_processable(doc=conv_res.document, element=element):
             return None
 
-        assert isinstance(element, TextItem)
+        assert isinstance(element, DocItem)
         element_prov = element.prov[0]
 
         bbox = element_prov.bbox