diff --git a/CHANGELOGS.rst b/CHANGELOGS.rst
index 444aaf34..e69e18c9 100644
--- a/CHANGELOGS.rst
+++ b/CHANGELOGS.rst
@@ -4,6 +4,8 @@ Change Logs
 0.4.4
 +++++
 
+* :pr:`82`: exposes ``register_flattening_functions``, add option ``--subfolder``
+* :pr:`81`: fixes missing ``intermediate_size`` in configuration
 * :pr:`79`: implements task ``object-detection``
 * :pr:`78`: uses *onnx-weekly* instead of *onnx* to avoid conflicts with *onnxscript*
 
diff --git a/_doc/examples/plot_export_with_dynamic_cache.py b/_doc/examples/plot_export_with_dynamic_cache.py
index 5dfa9c3f..aede8415 100644
--- a/_doc/examples/plot_export_with_dynamic_cache.py
+++ b/_doc/examples/plot_export_with_dynamic_cache.py
@@ -112,6 +112,7 @@ def forward(self, cache, z):
         )
 print(ep)
 
+# %%
 # Do we need to guess?
 # ++++++++++++++++++++
 #
diff --git a/onnx_diagnostic/_command_lines_parser.py b/onnx_diagnostic/_command_lines_parser.py
index 45acebf5..39ec66ce 100644
--- a/onnx_diagnostic/_command_lines_parser.py
+++ b/onnx_diagnostic/_command_lines_parser.py
@@ -336,6 +336,10 @@ def get_parser_validate() -> ArgumentParser:
         help="drops the following inputs names, it should be a list "
         "with comma separated values",
     )
+    parser.add_argument(
+        "--subfolder",
+        help="subfolder where to find the model and the configuration",
+    )
     parser.add_argument(
         "--ortfusiontype",
         required=False,
@@ -413,6 +417,7 @@ def _cmd_validate(argv: List[Any]):
             ortfusiontype=args.ortfusiontype,
             input_options=args.iop,
             model_options=args.mop,
+            subfolder=args.subfolder,
         )
         print("")
         print("-- summary --")
diff --git a/onnx_diagnostic/torch_export_patches/__init__.py b/onnx_diagnostic/torch_export_patches/__init__.py
index 0b241ba0..4ac9ae63 100644
--- a/onnx_diagnostic/torch_export_patches/__init__.py
+++ b/onnx_diagnostic/torch_export_patches/__init__.py
@@ -6,3 +6,15 @@
 
 # bypass_export_some_errors is the first name given to the patches.
 bypass_export_some_errors = torch_export_patches  # type: ignore
+
+
+def register_flattening_functions(verbose: int = 0):
+    """
+    Registers functions to serialize deserialize cache or other classes
+    implemented in :epkg:`transformers` and used as inputs.
+    This is needed whenever a model must be exported through
+    :func:`torch.export.export`.
+    """
+    from .onnx_export_serialization import _register_cache_serialization
+
+    return _register_cache_serialization(verbose=verbose)
diff --git a/onnx_diagnostic/torch_models/hghub/hub_api.py b/onnx_diagnostic/torch_models/hghub/hub_api.py
index 27caf0ff..6067b120 100644
--- a/onnx_diagnostic/torch_models/hghub/hub_api.py
+++ b/onnx_diagnostic/torch_models/hghub/hub_api.py
@@ -1,9 +1,10 @@
 import copy
 import functools
+import json
 import os
 from typing import Any, Dict, List, Optional, Union
 import transformers
-from huggingface_hub import HfApi, model_info
+from huggingface_hub import HfApi, model_info, hf_hub_download
 from ...helpers.config_helper import update_config
 from . import hub_data_cached_configs
 from .hub_data import __date__, __data_tasks__, load_architecture_task, __data_arch_values__
@@ -59,7 +60,11 @@ def get_cached_configuration(name: str, **kwargs) -> Optional[transformers.Pretr
 
 
 def get_pretrained_config(
-    model_id: str, trust_remote_code: bool = True, use_preinstalled: bool = True, **kwargs
+    model_id: str,
+    trust_remote_code: bool = True,
+    use_preinstalled: bool = True,
+    subfolder: Optional[str] = None,
+    **kwargs,
 ) -> Any:
     """
     Returns the config for a model_id.
@@ -71,13 +76,32 @@ def get_pretrained_config(
         accessing the network, if available, it is returned by
         :func:`get_cached_configuration`, the cached list is mostly for
         unit tests
+    :param subfolder: subfolder for the given model id
     :param kwargs: additional kwargs
     :return: a configuration
     """
     if use_preinstalled:
-        conf = get_cached_configuration(model_id, **kwargs)
+        conf = get_cached_configuration(model_id, subfolder=subfolder, **kwargs)
         if conf is not None:
             return conf
+    if subfolder:
+        try:
+            return transformers.AutoConfig.from_pretrained(
+                model_id, trust_remote_code=trust_remote_code, subfolder=subfolder, **kwargs
+            )
+        except ValueError:
+            # Then we try to download it.
+            config = hf_hub_download(
+                model_id, filename="config.json", subfolder=subfolder, **kwargs
+            )
+            try:
+                return transformers.AutoConfig.from_pretrained(
+                    config, trust_remote_code=trust_remote_code, **kwargs
+                )
+            except ValueError:
+                # Diffusers uses a dictionayr.
+                with open(config, "r") as f:
+                    return json.load(f)
     return transformers.AutoConfig.from_pretrained(
         model_id, trust_remote_code=trust_remote_code, **kwargs
     )
diff --git a/onnx_diagnostic/torch_models/hghub/hub_data.py b/onnx_diagnostic/torch_models/hghub/hub_data.py
index ce3794dc..9ae45d89 100644
--- a/onnx_diagnostic/torch_models/hghub/hub_data.py
+++ b/onnx_diagnostic/torch_models/hghub/hub_data.py
@@ -125,6 +125,7 @@
     T5ForConditionalGeneration,text2text-generation
     TableTransformerModel,image-feature-extraction
     TableTransformerForObjectDetection,object-detection
+    UNet2DConditionModel,text-to-image
     UniSpeechForSequenceClassification,audio-classification
     ViTForImageClassification,image-classification
     ViTMAEModel,image-feature-extraction
@@ -163,6 +164,7 @@
     "sentence-similarity",
     "text-classification",
     "text-generation",
+    "text-to-image",
     "text-to-audio",
     "text2text-generation",
     "zero-shot-image-classification",
diff --git a/onnx_diagnostic/torch_models/hghub/model_inputs.py b/onnx_diagnostic/torch_models/hghub/model_inputs.py
index b3b52c35..95bf221b 100644
--- a/onnx_diagnostic/torch_models/hghub/model_inputs.py
+++ b/onnx_diagnostic/torch_models/hghub/model_inputs.py
@@ -18,6 +18,7 @@ def get_untrained_model_with_inputs(
     same_as_pretrained: bool = False,
     use_preinstalled: bool = True,
     add_second_input: bool = False,
+    subfolder: Optional[str] = None,
 ) -> Dict[str, Any]:
     """
     Gets a non initialized model similar to the original model
@@ -37,6 +38,7 @@ def get_untrained_model_with_inputs(
     :param use_preinstalled: use preinstalled configurations
     :param add_second_input: provides a second inputs to check a model
         supports different shapes
+    :param subfolder: subfolder to use for this model id
     :return: dictionary with a model, inputs, dynamic shapes, and the configuration
 
     Example:
@@ -62,11 +64,18 @@ def get_untrained_model_with_inputs(
             print(f"[get_untrained_model_with_inputs] use preinstalled {model_id!r}")
     if config is None:
         config = get_pretrained_config(
-            model_id, use_preinstalled=use_preinstalled, **(model_kwargs or {})
+            model_id,
+            use_preinstalled=use_preinstalled,
+            subfolder=subfolder,
+            **(model_kwargs or {}),
         )
     if hasattr(config, "architecture") and config.architecture:
         archs = [config.architecture]
-    archs = config.architectures  # type: ignore
+    if type(config) is dict:
+        assert "_class_name" in config, f"Unable to get the architecture from config={config}"
+        archs = [config["_class_name"]]
+    else:
+        archs = config.architectures  # type: ignore
     task = None
     if archs is None:
         task = task_from_id(model_id)
@@ -84,6 +93,10 @@ def get_untrained_model_with_inputs(
 
     # model kwagrs
     if dynamic_rope is not None:
+        assert (
+            type(config) is not dict
+        ), f"Unable to set dynamic_rope if the configuration is a dictionary\n{config}"
+        assert hasattr(config, "rope_scaling"), f"Missing 'rope_scaling' in\n{config}"
         config.rope_scaling = (
             {"rope_type": "dynamic", "factor": 10.0} if dynamic_rope else None
         )
diff --git a/onnx_diagnostic/torch_models/test_helper.py b/onnx_diagnostic/torch_models/test_helper.py
index 06c907de..a2b443c5 100644
--- a/onnx_diagnostic/torch_models/test_helper.py
+++ b/onnx_diagnostic/torch_models/test_helper.py
@@ -109,9 +109,12 @@ def _make_folder_name(
     optimization: Optional[str] = None,
     dtype: Optional[Union[str, torch.dtype]] = None,
     device: Optional[Union[str, torch.device]] = None,
+    subfolder: Optional[str] = None,
 ) -> str:
     "Creates a filename unique based on the given options."
     els = [model_id.replace("/", "_")]
+    if subfolder:
+        els.append(subfolder.replace("/", "_"))
     if exporter:
         els.append(exporter)
     if optimization:
@@ -224,6 +227,7 @@ def validate_model(
     ortfusiontype: Optional[str] = None,
     input_options: Optional[Dict[str, Any]] = None,
     model_options: Optional[Dict[str, Any]] = None,
+    subfolder: Optional[str] = None,
 ) -> Tuple[Dict[str, Union[int, float, str]], Dict[str, Any]]:
     """
     Validates a model.
@@ -256,11 +260,11 @@ def validate_model(
         used to export
     :param model_options: additional options when creating the model such as
         ``num_hidden_layers`` or ``attn_implementation``
+    :param subfolder: version or subfolders to uses when retrieving a model id
     :return: two dictionaries, one with some metrics,
         another one with whatever the function produces
     """
     summary = version_summary()
-
     summary.update(
         dict(
             version_model_id=model_id,
@@ -282,7 +286,7 @@ def validate_model(
     folder_name = None
     if dump_folder:
         folder_name = _make_folder_name(
-            model_id, exporter, optimization, dtype=dtype, device=device
+            model_id, exporter, optimization, dtype=dtype, device=device, subfolder=subfolder
         )
         dump_folder = os.path.join(dump_folder, folder_name)
         if not os.path.exists(dump_folder):
@@ -293,11 +297,15 @@ def validate_model(
             print(f"[validate_model] dump into {folder_name!r}")
 
     if verbose:
-        print(f"[validate_model] validate model id {model_id!r}")
+        if subfolder:
+            print(f"[validate_model] validate model id {model_id!r}, subfolder={subfolder!r}")
+        else:
+            print(f"[validate_model] validate model id {model_id!r}")
         if model_options:
             print(f"[validate_model] model_options={model_options!r}")
         print(f"[validate_model] get dummy inputs with input_options={input_options}...")
         summary["model_id"] = model_id
+        summary["model_subfolder"] = subfolder or ""
 
     iop = input_options or {}
     mop = model_options or {}
@@ -307,7 +315,7 @@ def validate_model(
         summary,
         None,
         (
-            lambda mid=model_id, v=verbose, task=task, tr=trained, iop=iop: (
+            lambda mid=model_id, v=verbose, task=task, tr=trained, iop=iop, sub=subfolder: (
                 get_untrained_model_with_inputs(
                     mid,
                     verbose=v,
@@ -315,6 +323,7 @@ def validate_model(
                     same_as_pretrained=tr,
                     inputs_kwargs=iop,
                     model_kwargs=mop,
+                    subfolder=sub,
                 )
             )
         ),
@@ -1060,15 +1069,16 @@ def call_torch_export_custom(
     assert (
         optimization in available
     ), f"unexpected value for optimization={optimization}, available={available}"
-    assert exporter in {
+    available = {
         "custom",
         "custom-strict",
-        "custom-strict-dec",
+        "custom-strict-default",
         "custom-strict-all",
         "custom-nostrict",
-        "custom-nostrict-dec",
+        "custom-nostrict-default",
         "custom-nostrict-all",
-    }, f"Unexpected value for exporter={exporter!r}"
+    }
+    assert exporter in available, f"Unexpected value for exporter={exporter!r} in {available}"
     assert "model" in data, f"model is missing from data: {sorted(data)}"
     assert "inputs_export" in data, f"inputs_export is missing from data: {sorted(data)}"
     summary: Dict[str, Union[str, int, float]] = {}
@@ -1100,7 +1110,7 @@ def call_torch_export_custom(
     export_options = ExportOptions(
         strict=strict,
         decomposition_table=(
-            "dec" if "-dec" in exporter else ("all" if "-all" in exporter else None)
+            "default" if "-default" in exporter else ("all" if "-all" in exporter else None)
         ),
     )
     options = OptimizationOptions(patterns=optimization) if optimization else None