Remove dead Opset function_defs registration

onnxscript/_internal/converter.py

@@ -1478,7 +1478,6 @@ def translate_function_def(self, stmt: ast.FunctionDef) -> irbuilder.IRFunction:
             self._current_fn = irbuilder.IRFunction(stmt.name, domain)
             self._analyzer = analysis.AstAnalyzer(stmt, self._message, self.globals)
             fn_ir = self._translate_function_def_common(stmt)
-            self.this_module.add_function_def(fn_ir)
             self._analyzer = None
             return fn_ir
         raise ValueError(f"Unsupported top-level statement type {type(stmt)!r}.")

onnxscript/_internal/values.py

@@ -94,7 +94,6 @@ def __new__(cls, domain: str, version: int):
         instance = super().__new__(cls)
         instance.domain = domain  # type: ignore[attr-defined]
         instance.version = version  # type: ignore[attr-defined]
-        instance.function_defs = {}  # type: ignore[attr-defined]
         cls.cache[key] = instance
         return instance
 
@@ -130,9 +129,6 @@ def __getattr__(self, attr: str) -> Op:
         except Exception as exc:  # pylint: disable=broad-exception-caught
             raise AttributeError(f"Attribute {attr} not found.") from exc
 
-    def add_function_def(self, fun):
-        self.function_defs[fun.name] = fun
-
     def _prepare_inputs(self, _: onnx.defs.OpSchema, *inputs):
         """Trims 'None' values from the end of the inputs list. This is used to support
         omitting optional inputs when no more required inputs follow to prepare a valid call