--- title: thunder.core.symbol.Symbol canonical: >- https://lightning.ai/docs/thunder/stable/api-reference/generated/thunder.core.symbol.Symbol --- # thunder.core.symbol.Symbol {#thunder-core-symbol-symbol} ### `class thunder.core.symbol.Symbol(name, meta=None, id=None, is_prim=False, tags=None, is_fusion=False, python_printer=, _module=None, _hash=None, executor=None, python_impl=None, _print_as_impl=False, _bind_postprocess=None)` {#thunder.core.symbol.Symbol} [\[source\]](https://github.com/Lightning-AI/lightning-thunder/blob/0.2.6/thunder/core/symbol.py#L119-L354) Bases: [`object`](https://docs.python.org/3/builtins/functions.html#object "(in Python v3.15)") Parameters: * **name** ([_str_](https://docs.python.org/3/builtins/stdtypes.html#str "(in Python v3.15)")) – * **meta** ([_collections.abc.Callable_](https://docs.python.org/3/library/collections.abc.html#collections.abc.Callable "(in Python v3.15)") _|_ _None_) – * **id** ([_Union_](https://docs.python.org/3/library/typing.html#typing.Union "(in Python v3.15)")_\[__None__,_ [_Any_](https://docs.python.org/3/library/typing.html#typing.Any "(in Python v3.15)")_\]_) – * **is\_prim** ([_bool_](https://docs.python.org/3/builtins/functions.html#bool "(in Python v3.15)")) – * **tags** (_None_ _|_ [_list_](https://docs.python.org/3/builtins/stdtypes.html#list "(in Python v3.15)")_\[__thunder.core.prims.OpTags__\]_) – * **is\_fusion** ([_bool_](https://docs.python.org/3/builtins/functions.html#bool "(in Python v3.15)")) – * **python\_printer** ([_Callable_](https://docs.python.org/3/library/collections.abc.html#collections.abc.Callable "(in Python v3.15)")) – * **\_module** (_None_ _|_ [_type_](https://docs.python.org/3/builtins/functions.html#type "(in Python v3.15)") _|_ _module_) – * **\_hash** ([_int_](https://docs.python.org/3/builtins/functions.html#int "(in Python v3.15)") _|_ _None_) – * **executor** ([_Union_](https://docs.python.org/3/library/typing.html#typing.Union "(in Python v3.15)")_\[__None__,_ [_Any_](https://docs.python.org/3/library/typing.html#typing.Any "(in Python v3.15)")_\]_) – * **python\_impl** (_None_ _|_ [_collections.abc.Callable_](https://docs.python.org/3/library/collections.abc.html#collections.abc.Callable "(in Python v3.15)")) – * **\_print\_as\_impl** ([_bool_](https://docs.python.org/3/builtins/functions.html#bool "(in Python v3.15)")) – * **\_bind\_postprocess** (_None_ _|_ [_collections.abc.Callable_](https://docs.python.org/3/library/collections.abc.html#collections.abc.Callable "(in Python v3.15)")) – #### `__init__(name, meta=None, id=None, is_prim=False, tags=None, is_fusion=False, python_printer=, _module=None, _hash=None, executor=None, python_impl=None, _print_as_impl=False, _bind_postprocess=None)` {#thunder.core.symbol.Symbol.__init__} [\[source\]](https://github.com/Lightning-AI/lightning-thunder/blob/0.2.6/thunder/core/symbol.py) Parameters: * **name** ([_str_](https://docs.python.org/3/builtins/stdtypes.html#str "(in Python v3.15)")) – * **meta** ([_Optional_](https://docs.python.org/3/library/typing.html#typing.Optional "(in Python v3.15)")_\[_[_Callable_](https://docs.python.org/3/library/collections.abc.html#collections.abc.Callable "(in Python v3.15)")_\]_) – * **id** ([_Optional_](https://docs.python.org/3/library/typing.html#typing.Optional "(in Python v3.15)")_\[_[_Any_](https://docs.python.org/3/library/typing.html#typing.Any "(in Python v3.15)")_\]_) – * **is\_prim** ([_bool_](https://docs.python.org/3/builtins/functions.html#bool "(in Python v3.15)")) – * **tags** ([_Union_](https://docs.python.org/3/library/typing.html#typing.Union "(in Python v3.15)")_\[__None__,_ [_list_](https://docs.python.org/3/builtins/stdtypes.html#list "(in Python v3.15)")_\[__thunder.core.prims.OpTags__\]__\]_) – * **is\_fusion** ([_bool_](https://docs.python.org/3/builtins/functions.html#bool "(in Python v3.15)")) – * **python\_printer** ([_Callable_](https://docs.python.org/3/library/collections.abc.html#collections.abc.Callable "(in Python v3.15)")) – * **\_module** ([_Union_](https://docs.python.org/3/library/typing.html#typing.Union "(in Python v3.15)")_\[__None__,_ [_type_](https://docs.python.org/3/builtins/functions.html#type "(in Python v3.15)")_,_ _module__\]_) – * **\_hash** ([_Union_](https://docs.python.org/3/library/typing.html#typing.Union "(in Python v3.15)")_\[__None__,_ [_int_](https://docs.python.org/3/builtins/functions.html#int "(in Python v3.15)")_\]_) – * **executor** ([_Optional_](https://docs.python.org/3/library/typing.html#typing.Optional "(in Python v3.15)")_\[_[_Any_](https://docs.python.org/3/library/typing.html#typing.Any "(in Python v3.15)")_\]_) – * **python\_impl** ([_Optional_](https://docs.python.org/3/library/typing.html#typing.Optional "(in Python v3.15)")_\[_[_Callable_](https://docs.python.org/3/library/collections.abc.html#collections.abc.Callable "(in Python v3.15)")_\]_) – * **\_print\_as\_impl** ([_bool_](https://docs.python.org/3/builtins/functions.html#bool "(in Python v3.15)")) – * **\_bind\_postprocess** ([_Optional_](https://docs.python.org/3/library/typing.html#typing.Optional "(in Python v3.15)")_\[_[_Callable_](https://docs.python.org/3/library/collections.abc.html#collections.abc.Callable "(in Python v3.15)")_\]_) – Return type: None Methods - [`__init__(name[, meta, id, is_prim, tags, ...])`](#thunder.core.symbol.Symbol.__init__) - `bind(*args, output[, subsymbols, _call_ctx])` — rtype:BoundSymbol - `lookup_symbol(name, executor, module)` — rtype:Symbol - `normalize(*args, **kwargs)` Attributes - `name` - `meta` - `id` - `is_prim` - `tags` - `is_fusion` - `python_printer` - `executor` - `python_impl` - `module` #### `__call__(*args, **kwargs)` {#thunder.core.symbol.Symbol.__call__} [\[source\]](https://github.com/Lightning-AI/lightning-thunder/blob/0.2.6/thunder/core/symbol.py#L278-L354) Call self as a function. --- 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