From 0b75bcf7fdd38b8fed57fb533c6783a3296a42ed Mon Sep 17 00:00:00 2001
From: Luca Wehrstedt <lcw@meta.com>
Date: Mon, 19 Aug 2024 14:11:26 +0000
Subject: [PATCH] Remove tooling to auto-register operators

ghstack-source-id: 457565b18dfd3a7958402320751d1b539c684bb9
Pull Request resolved: https://github.com/fairinternal/xformers/pull/1198

__original_commit__ = fairinternal/xformers@79e7111d0f6d6dbec833578446a08dd5a3b222f6
---
 xformers/ops/common.py | 98 +-----------------------------------------
 1 file changed, 1 insertion(+), 97 deletions(-)

diff --git a/xformers/ops/common.py b/xformers/ops/common.py
index 420b0f82b..7dab42caa 100644
--- a/xformers/ops/common.py
+++ b/xformers/ops/common.py
@@ -3,13 +3,9 @@
 # This source code is licensed under the BSD license found in the
 # LICENSE file in the root directory of this source tree.
 
-import inspect
-from dataclasses import dataclass
-from functools import wraps
-from typing import Any, Callable, Dict, List, Type, TypeVar, Union
+from typing import Any, Dict, List, Type, TypeVar
 
 import torch
-from typing_extensions import Annotated, get_args, get_origin
 
 
 def get_operator(library: str, name: str):
@@ -71,95 +67,3 @@ def register_operator(cls: ClsT) -> ClsT:
 
 def _get_storage_base(x: torch.Tensor) -> int:
     return _GET_TENSOR_STORAGE(x).data_ptr()  # type: ignore
-
-
-@dataclass(frozen=True)
-class Alias:
-    name: str
-    write: bool
-
-
-def make_pytorch_cuda_operator(fn: ClsT) -> ClsT:
-    return turn_into_pytorch_op(fn, "CUDA")
-
-
-def make_pytorch_operator_for_dispatch_key(dispatch_key: str) -> Callable[[ClsT], ClsT]:
-    def decorator(fn: ClsT) -> ClsT:
-        return turn_into_pytorch_op(fn, dispatch_key)
-
-    return decorator
-
-
-def turn_into_pytorch_op(fn: ClsT, dispatch_key: str) -> ClsT:
-    from .. import get_python_lib
-
-    def render_arg_type(annotation) -> str:
-        # Optional[T] is an alias for Union[T, None]
-        if get_origin(annotation) is Union:
-            inner_types = [
-                t for t in get_args(annotation) if t is not type(None)  # noqa: E721
-            ]
-            if len(inner_types) == 1:
-                return f"{render_arg_type(inner_types[0])}?"
-        if get_origin(annotation) is list:
-            (inner_type,) = get_args(annotation)
-            return f"{render_arg_type(inner_type)}[]"
-        if get_origin(annotation) is tuple:
-            return (
-                "("
-                + ", ".join([render_arg_type(t) for t in get_args(annotation)])
-                + ")"
-            )
-        if get_origin(annotation) is Annotated:
-            inner_type, annotation = get_args(annotation)
-            if isinstance(annotation, Alias):
-                alias = annotation.name + ("!" if annotation.write else "")
-                return f"{render_arg_type(inner_type)}({alias})"
-        if annotation is torch.Tensor:
-            return "Tensor"
-        if annotation is bool:
-            return "bool"
-        if annotation is int:
-            return "int"
-        if annotation is float:
-            return "float"
-        if annotation is torch.dtype:
-            return "ScalarType"
-        if annotation is torch.distributed.ProcessGroup:
-            return "__torch__.torch.classes.c10d.ProcessGroup"
-        assert False, f"Unable to parse annotation: `{annotation}`"
-
-    def render_default_value(default):
-        if default is inspect.Parameter.empty:
-            return ""
-        return f" = {default!r}"
-
-    sign = inspect.signature(fn)  # type: ignore
-    arguments = [
-        f"{render_arg_type(arg.annotation)} {arg.name}{render_default_value(arg.default)}"
-        for arg in sign.parameters.values()
-    ]
-    op_name = fn.__name__  # type: ignore
-    definition = f"{op_name}({', '.join(arguments)}) -> {render_arg_type(sign.return_annotation)}"
-
-    def callee(*args, **kwargs):
-        ba = sign.bind(*args, **kwargs)
-        for name, value in ba.arguments.items():
-            if sign.parameters[name].annotation is torch.distributed.ProcessGroup:
-                ba.arguments[name] = torch.distributed.ProcessGroup.unbox(value)
-        return fn(*ba.args, **ba.kwargs)
-
-    xformers_lib = get_python_lib()
-    xformers_lib.define(definition)
-    xformers_lib.impl(op_name, callee, dispatch_key)
-    dispatcher_impl = getattr(getattr(torch.ops, xformers_lib.ns), op_name)
-
-    @wraps(fn)  # type: ignore[arg-type]
-    def caller(*args, **kwargs):
-        ba = sign.bind(*args, **kwargs)
-        for name, value in ba.arguments.items():
-            if sign.parameters[name].annotation is torch.distributed.ProcessGroup:
-                ba.arguments[name] = value.boxed()
-        return dispatcher_impl(*ba.args, **ba.kwargs)
-
-    return caller  # type: ignore