integrate gen_oplist as a function (#1498)

Summary:
Pull Request resolved: #1498

This function integrates  gen_oplist as a function for other files use.

Reviewed By: lucylq

Differential Revision: D52449487

fbshipit-source-id: b7210c87c0b311e4e08b9de80135c0947d55208a

Author: Gasoonjia

codegen/tools/gen_oplist.py

@@ -189,6 +189,67 @@ def _dump_yaml(
         )
 
 
+def gen_oplist(
+    output_path: str,
+    model_file_path: Optional[str] = None,
+    ops_schema_yaml_path: Optional[str] = None,
+    root_ops: Optional[str] = None,
+    ops_dict: Optional[str] = None,
+    include_all_operators: bool = False,
+):
+    assert (
+        model_file_path
+        or ops_schema_yaml_path
+        or root_ops
+        or ops_dict
+        or include_all_operators
+    ), "Need to provide either model_file_path or ops_schema_yaml_path or root_ops or ops_dict or include_all_operators."
+
+    assert output_path, "Need to provide output_path for dumped yaml file."
+    op_set = set()
+    source_name = None
+    et_kernel_metadata = {}
+    if root_ops:
+        op_set.update(set(filter(lambda x: len(x) > 0, root_ops.split(","))))
+        et_kernel_metadata = merge_et_kernel_metadata(
+            et_kernel_metadata, {op: ["default"] for op in op_set}
+        )
+    if ops_dict:
+        ops_and_metadata = json.loads(ops_dict)
+        for op, metadata in ops_and_metadata.items():
+            op_set.update({op})
+            op_metadata = metadata if len(metadata) > 0 else ["default"]
+            et_kernel_metadata = merge_et_kernel_metadata(
+                et_kernel_metadata, {op: op_metadata}
+            )
+    if model_file_path:
+        assert os.path.isfile(
+            model_file_path
+        ), "The value for --model_file_path needs to be a valid file."
+        op_set.update(_get_operators(model_file_path))
+        source_name = model_file_path
+        et_kernel_metadata = merge_et_kernel_metadata(
+            et_kernel_metadata, _get_kernel_metadata_for_model(model_file_path)
+        )
+    if ops_schema_yaml_path:
+        assert os.path.isfile(
+            ops_schema_yaml_path
+        ), "The value for --ops_schema_yaml_path needs to be a valid file."
+        et_kernel_metadata = merge_et_kernel_metadata(
+            et_kernel_metadata,
+            _get_et_kernel_metadata_from_ops_yaml(ops_schema_yaml_path),
+        )
+        op_set.update(et_kernel_metadata.keys())
+        source_name = ops_schema_yaml_path
+    _dump_yaml(
+        sorted(op_set),
+        output_path,
+        os.path.basename(source_name) if source_name else None,
+        et_kernel_metadata,
+        include_all_operators,
+    )
+
+
 def main(args: List[Any]) -> None:
     """This binary generates selected_operators.yaml which will be consumed by caffe2/torchgen/gen.py.
     It reads the model file, deserialize it and dumps all the operators into selected_operators.yaml so
@@ -233,54 +294,14 @@ def main(args: List[Any]) -> None:
         required=False,
     )
     options = parser.parse_args(args)
-    assert (
-        options.model_file_path
-        or options.ops_schema_yaml_path
-        or options.root_ops
-        or options.ops_dict
-        or options.include_all_operators
-    ), "Need to provide either model_file_path or ops_schema_yaml_path or root_ops or include_all_operators."
-    op_set = set()
-    source_name = None
-    et_kernel_metadata = {}
-    if options.root_ops:
-        op_set.update(set(filter(lambda x: len(x) > 0, options.root_ops.split(","))))
-        et_kernel_metadata = merge_et_kernel_metadata(
-            et_kernel_metadata, {op: ["default"] for op in op_set}
-        )
-    if options.ops_dict:
-        ops_and_metadata = json.loads(options.ops_dict)
-        for op, metadata in ops_and_metadata.items():
-            op_set.update({op})
-            op_metadata = metadata if len(metadata) > 0 else ["default"]
-            et_kernel_metadata = merge_et_kernel_metadata(
-                et_kernel_metadata, {op: op_metadata}
-            )
-    if options.model_file_path:
-        assert os.path.isfile(
-            options.model_file_path
-        ), "The value for --model_file_path needs to be a valid file."
-        op_set.update(_get_operators(options.model_file_path))
-        source_name = options.model_file_path
-        et_kernel_metadata = merge_et_kernel_metadata(
-            et_kernel_metadata, _get_kernel_metadata_for_model(options.model_file_path)
-        )
-    if options.ops_schema_yaml_path:
-        assert os.path.isfile(
-            options.ops_schema_yaml_path
-        ), "The value for --ops_schema_yaml_path needs to be a valid file."
-        et_kernel_metadata = merge_et_kernel_metadata(
-            et_kernel_metadata,
-            _get_et_kernel_metadata_from_ops_yaml(options.ops_schema_yaml_path),
-        )
-        op_set.update(et_kernel_metadata.keys())
-        source_name = options.ops_schema_yaml_path
-    _dump_yaml(
-        sorted(op_set),
-        options.output_path,
-        os.path.basename(source_name) if source_name else None,
-        et_kernel_metadata,
-        options.include_all_operators,
+
+    gen_oplist(
+        output_path=options.output_path,
+        model_file_path=options.model_file_path,
+        ops_schema_yaml_path=options.ops_schema_yaml_path,
+        root_ops=options.root_ops,
+        ops_dict=options.ops_dict,
+        include_all_operators=options.include_all_operators,
     )