Refactor FalconMamba: replace class-name checks with generic attribute detection (#424)

* Initial plan

* Refactor FalconMamba: replace class name checks with generic hasattr(config, 'use_mambapy')

Co-authored-by: xadupre <22452781+xadupre@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: xadupre <22452781+xadupre@users.noreply.github.com>

Author: Copilot

onnx_diagnostic/tasks/text_generation.py

@@ -13,7 +13,7 @@
 
 def reduce_model_config(config: Any) -> Dict[str, Any]:
     """Reduces a model size."""
-    # FalconMambaConfig: use_mambapy
+    # Mamba models (e.g. FalconMambaConfig) use use_mambapy instead of num_attention_heads
     if hasattr(config, "text_config"):
         # The model is probably of mixture of models used only for text.
         config = config.text_config
@@ -25,7 +25,7 @@ def reduce_model_config(config: Any) -> Dict[str, Any]:
         "hidden_size",
         "vocab_size",
     )
-    if config.__class__.__name__ == "FalconMambaConfig":
+    if hasattr(config, "use_mambapy"):
         check_hasattr(config, "conv_kernel", "state_size", "intermediate_size")  # 4 and 8
         kwargs = dict(
             num_hidden_layers=min(config.num_hidden_layers, nhl()),
@@ -54,7 +54,7 @@ def reduce_model_config(config: Any) -> Dict[str, Any]:
     return kwargs
 
 
-def _get_input_falcon_mamba(
+def _get_input_mamba(
     model: torch.nn.Module,
     config: Optional[Any],
     dummy_max_token_id: int,
@@ -157,8 +157,8 @@ def get_inputs(
     seq_length = "seq_length"  # torch.export.Dim("seq_length", min=1, max=4096)
     cache_length = "cache_length"  # torch.export.Dim("cache_length", min=1, max=4096)
 
-    if config is not None and config.__class__.__name__ == "FalconMambaConfig":
-        res = _get_input_falcon_mamba(
+    if config is not None and hasattr(config, "use_mambapy"):
+        res = _get_input_mamba(
             model=model,
             config=config,
             dummy_max_token_id=dummy_max_token_id,
@@ -343,7 +343,7 @@ def random_input_kwargs(config: Any) -> Tuple[Dict[str, Any], Callable]:
             ("num_key_value_heads", "num_attention_heads", "use_mambapy"),
             "hidden_size",
         )
-    if config.__class__.__name__ == "FalconMambaConfig":
+    if hasattr(config, "use_mambapy"):
         check_hasattr(config, "conv_kernel", "state_size", "intermediate_size")  # 4 and 8
         kwargs = dict(
             batch_size=2,