Give this artifact's bridge its own config and model subclasses (FastPLMs#50)

Artifacts share one FastPLMs runtime per process. Re-exported shared classes let one artifact's model class answer for another with the same config class, for example ESMFold2-300 built as ESMFold2Model after ESMFold2-Fast loaded. Only modeling_fastplms.py changes; the runtime bundle and weights are untouched. https://github.com/Synthyra/FastPLMs/issues/50

modeling_fastplms.py

@@ -180,14 +180,31 @@ def _install_runtime():
     return package
 
 _install_runtime()
-_module_182 = _import_without_bytecode("fastplms.models.esm_plusplus.modeling_esm_plusplus")
-ESMplusplusConfig = _module_182.ESMplusplusConfig
-ESMplusplusConfig.__module__ = __name__
-ESMplusplusForMaskedLM = _module_182.ESMplusplusForMaskedLM
-ESMplusplusForMaskedLM.__module__ = __name__
-ESMplusplusForSequenceClassification = _module_182.ESMplusplusForSequenceClassification
-ESMplusplusForSequenceClassification.__module__ = __name__
-ESMplusplusForTokenClassification = _module_182.ESMplusplusForTokenClassification
-ESMplusplusForTokenClassification.__module__ = __name__
-ESMplusplusModel = _module_182.ESMplusplusModel
-ESMplusplusModel.__module__ = __name__
+
+def _artifact_class(base, config_class=None):
+    """Subclass a shared runtime class so this artifact registers its own classes.
+
+    The base constructor is kept explicitly because Transformers turns every config
+    subclass into a dataclass, which would otherwise generate a new constructor.
+    """
+    namespace = {
+        "__module__": __name__,
+        "__qualname__": base.__name__,
+        "__doc__": base.__doc__,
+        "__init__": base.__init__,
+    }
+    base_config_class = getattr(base, "config_class", None)
+    if (
+        config_class is not None
+        and isinstance(base_config_class, type)
+        and issubclass(config_class, base_config_class)
+    ):
+        namespace["config_class"] = config_class
+    return type(base.__name__, (base,), namespace)
+
+_module_204 = _import_without_bytecode("fastplms.models.esm_plusplus.modeling_esm_plusplus")
+ESMplusplusConfig = _artifact_class(_module_204.ESMplusplusConfig)
+ESMplusplusForMaskedLM = _artifact_class(_module_204.ESMplusplusForMaskedLM, config_class=ESMplusplusConfig)
+ESMplusplusForSequenceClassification = _artifact_class(_module_204.ESMplusplusForSequenceClassification, config_class=ESMplusplusConfig)
+ESMplusplusForTokenClassification = _artifact_class(_module_204.ESMplusplusForTokenClassification, config_class=ESMplusplusConfig)
+ESMplusplusModel = _artifact_class(_module_204.ESMplusplusModel, config_class=ESMplusplusConfig)