From d7ad0e427f10d02512bd4136abb6a25eda9befbc Mon Sep 17 00:00:00 2001
From: haozi <64006169+NotHaozi@users.noreply.github.com>
Date: Fri, 2 Jun 2023 14:36:00 +0800
Subject: [PATCH] dy2static: Remove the dependency of AstNodeWrapper (#54237)

* [IR] delete_wrapper

* [IR] modify the ast_transformer core logic

* [fix] modify the test_origin_info
---
 python/paddle/jit/dy2static/__init__.py       |  2 +-
 .../jit/dy2static/assert_transformer.py       |  9 ++------
 .../paddle/jit/dy2static/ast_transformer.py   | 22 ++++++++-----------
 .../paddle/jit/dy2static/base_transformer.py  |  5 ++---
 .../jit/dy2static/basic_api_transformer.py    | 21 +++++-------------
 .../dy2static/break_continue_transformer.py   | 10 ++++-----
 .../paddle/jit/dy2static/call_transformer.py  |  9 ++------
 .../paddle/jit/dy2static/cast_transformer.py  | 10 +++------
 .../dy2static/create_variable_transformer.py  |  9 ++------
 .../jit/dy2static/decorator_transformer.py    |  9 ++------
 .../jit/dy2static/early_return_transformer.py |  9 ++------
 .../jit/dy2static/ifelse_transformer.py       |  9 ++------
 .../jit/dy2static/logical_transformer.py      |  5 ++---
 .../paddle/jit/dy2static/loop_transformer.py  | 12 ++++------
 .../jit/dy2static/program_translator.py       | 14 ++++++------
 .../jit/dy2static/return_transformer.py       |  5 ++---
 .../jit/dy2static/tensor_shape_transformer.py |  9 ++------
 .../jit/dy2static/tensorhook_transformer.py   |  4 ++--
 .../jit/dy2static/typehint_transformer.py     | 10 ++-------
 test/dygraph_to_static/test_origin_info.py    |  2 +-
 20 files changed, 58 insertions(+), 127 deletions(-)

diff --git a/python/paddle/jit/dy2static/__init__.py b/python/paddle/jit/dy2static/__init__.py
index bc91a4c1674..136ab6dab7d 100644
--- a/python/paddle/jit/dy2static/__init__.py
+++ b/python/paddle/jit/dy2static/__init__.py
@@ -34,6 +34,6 @@ from .convert_operators import convert_shape_compare  # noqa: F401
 from .assert_transformer import AssertTransformer
 from .ast_transformer import DygraphToStaticAst
 from .program_translator import convert_to_static
-from .static_analysis import AstNodeWrapper, NodeVarType, StaticAnalysisVisitor
+from .static_analysis import NodeVarType, StaticAnalysisVisitor
 
 __all__ = []
diff --git a/python/paddle/jit/dy2static/assert_transformer.py b/python/paddle/jit/dy2static/assert_transformer.py
index f77a3f87f98..acf17b58618 100644
--- a/python/paddle/jit/dy2static/assert_transformer.py
+++ b/python/paddle/jit/dy2static/assert_transformer.py
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from paddle.jit.dy2static.static_analysis import AstNodeWrapper
 from paddle.jit.dy2static.utils import ast_to_source_code
 from paddle.utils import gast
 
@@ -26,12 +25,8 @@ class AssertTransformer(BaseTransformer):
     A class transforms python assert to convert_assert.
     """
 
-    def __init__(self, wrapper_root):
-        assert isinstance(
-            wrapper_root, AstNodeWrapper
-        ), "Input non-AstNodeWrapper node for the initialization of AssertTransformer."
-        self.wrapper_root = wrapper_root
-        self.root = wrapper_root.node
+    def __init__(self, root):
+        self.root = root
 
     def transform(self):
         self.visit(self.root)
diff --git a/python/paddle/jit/dy2static/ast_transformer.py b/python/paddle/jit/dy2static/ast_transformer.py
index 66d334dc7fc..bdb3e5b59cc 100644
--- a/python/paddle/jit/dy2static/ast_transformer.py
+++ b/python/paddle/jit/dy2static/ast_transformer.py
@@ -36,7 +36,6 @@ from .ifelse_transformer import IfElseTransformer
 from .logical_transformer import LogicalTransformer
 from .loop_transformer import LoopTransformer
 from .return_transformer import ReturnTransformer
-from .static_analysis import StaticAnalysisVisitor
 from .tensor_shape_transformer import TensorShapeTransformer
 from .tensorhook_transformer import RegisterHookTransformer
 from .typehint_transformer import TypeHintTransformer
@@ -69,28 +68,25 @@ class DygraphToStaticAst(BaseTransformer):
         self.translator_logger = logging_utils.TranslatorLogger()
 
     def get_static_ast(self, root):
-        # save root for some analysis may need global AST
         self.root = root
-        self.static_analysis_visitor = StaticAnalysisVisitor(root)
-        self.static_analysis_root = (
-            self.static_analysis_visitor.get_node_wrapper_root()
-        )
         self.decorate_func_name = None
-        self.transfer_from_node_type(self.static_analysis_root)
-        return self.static_analysis_root
 
-    def _apply(self, transformer, node_wrapper, log_level):
-        transformer(node_wrapper).transform()
+        # inplace transfer
+        self.transfer_from_node_type(self.root)
+        return self.root
+
+    def _apply(self, transformer, node, log_level):
+        transformer(node).transform()
         self.translator_logger.log_transformed_code(
             log_level, self.root, transformer.__name__
         )
 
-    def transfer_from_node_type(self, node_wrapper):
+    def transfer_from_node_type(self, node):
         self.translator_logger.log(
             1, f"Source code: \n{ast_to_source_code(self.root)}"
         )
         # Generic transformation
-        self.visit(node_wrapper.node)
+        self.visit(node)
 
         transformers = [
             RegisterHookTransformer,
@@ -114,7 +110,7 @@ class DygraphToStaticAst(BaseTransformer):
         apply_optimization(transformers)
 
         for index, transformer in enumerate(transformers):
-            self._apply(transformer, node_wrapper, log_level=index + 1)
+            self._apply(transformer, node, log_level=index + 1)
 
         self.translator_logger.log_transformed_code(
             logging_utils.LOG_AllTransformer, self.root, "All Transformers"
diff --git a/python/paddle/jit/dy2static/base_transformer.py b/python/paddle/jit/dy2static/base_transformer.py
index c019f87dee0..cddea923760 100644
--- a/python/paddle/jit/dy2static/base_transformer.py
+++ b/python/paddle/jit/dy2static/base_transformer.py
@@ -139,9 +139,8 @@ class ForLoopTuplePreTransformer(BaseTransformer):
     >>>     body
     """
 
-    def __init__(self, wrapper_root):
-        self.wrapper_root = wrapper_root
-        self.root = wrapper_root.node
+    def __init__(self, root):
+        self.root = root
 
     def transform(self):
         self.visit(self.root)
diff --git a/python/paddle/jit/dy2static/basic_api_transformer.py b/python/paddle/jit/dy2static/basic_api_transformer.py
index a2c9823a353..f188df92cd9 100644
--- a/python/paddle/jit/dy2static/basic_api_transformer.py
+++ b/python/paddle/jit/dy2static/basic_api_transformer.py
@@ -18,7 +18,6 @@ from paddle.utils import gast
 
 from . import utils
 from .base_transformer import BaseTransformer
-from .static_analysis import AstNodeWrapper
 
 __all__ = []
 
@@ -28,13 +27,8 @@ class BasicApiTransformer(BaseTransformer):
     Class to transform basic API from dygraph to static graph.
     """
 
-    def __init__(self, wrapper_root):
-        assert isinstance(
-            wrapper_root, AstNodeWrapper
-        ), "Input non-AstNodeWrapper node for the initialization of BasicApiTransformer."
-
-        self.wrapper_root = wrapper_root
-        self.root = wrapper_root.node
+    def __init__(self, root):
+        self.root = root
         self.class_node_dict = {}
 
     def transform(self):
@@ -43,7 +37,7 @@ class BasicApiTransformer(BaseTransformer):
         attribute_transformer = AttributeJstTransformer(self.root)
         attribute_transformer.transform()
         self.visit(self.root)
-        return self.wrapper_root
+        return self.root
 
     def visit_Assign(self, node):
         if self._update_class_node_dict(node):
@@ -138,13 +132,8 @@ class NameloadJstTransformer(BaseTransformer):
     NOTE: we only deal with ctx=Load() case.
     """
 
-    def __init__(self, wrapper_root):
-        assert isinstance(
-            wrapper_root, AstNodeWrapper
-        ), "Input non-AstNodeWrapper node for the initialization of BasicApiTransformer."
-
-        self.wrapper_root = wrapper_root
-        self.root = wrapper_root.node
+    def __init__(self, root):
+        self.root = root
 
     def transform(self):
         self.visit(self.root)
diff --git a/python/paddle/jit/dy2static/break_continue_transformer.py b/python/paddle/jit/dy2static/break_continue_transformer.py
index 728fc02eff1..6e1199bf0ed 100644
--- a/python/paddle/jit/dy2static/break_continue_transformer.py
+++ b/python/paddle/jit/dy2static/break_continue_transformer.py
@@ -111,11 +111,10 @@ class BreakContinueTransformer(BaseNodeVisitor):
           In general, we recommend to inheriting NodeTransformer to modify node!
     """
 
-    def __init__(self, wrapper_root):
+    def __init__(self, root):
         super().__init__()
 
-        self.wrapper_root = wrapper_root
-        self.root = wrapper_root.node
+        self.root = root
 
     def transform(self):
         self.visit(self.root)
@@ -336,11 +335,10 @@ class BreakTransformOptimizer(BaseNodeVisitor):
     usually brings very heavy overhead.
     """
 
-    def __init__(self, wrapper_root):
+    def __init__(self, root):
         super().__init__()
 
-        self.wrapper_root = wrapper_root
-        self.root = wrapper_root.node
+        self.root = root
 
     def transform(self):
         self.visit(self.root)
diff --git a/python/paddle/jit/dy2static/call_transformer.py b/python/paddle/jit/dy2static/call_transformer.py
index e4418a62206..7ed0a4681bc 100644
--- a/python/paddle/jit/dy2static/call_transformer.py
+++ b/python/paddle/jit/dy2static/call_transformer.py
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from paddle.jit.dy2static.static_analysis import AstNodeWrapper
 from paddle.jit.dy2static.utils import ast_to_source_code, is_paddle_api
 from paddle.utils import gast
 
@@ -29,12 +28,8 @@ class CallTransformer(BaseTransformer):
     This class transforms function calls into Static Graph Ast.
     """
 
-    def __init__(self, wrapper_root):
-        assert isinstance(
-            wrapper_root, AstNodeWrapper
-        ), "Input non-AstNodeWrapper node for the initialization of CallTransformer."
-        self.wrapper_root = wrapper_root
-        self.root = wrapper_root.node
+    def __init__(self, root):
+        self.root = root
 
     def _no_need_convert_call(self, node):
         """
diff --git a/python/paddle/jit/dy2static/cast_transformer.py b/python/paddle/jit/dy2static/cast_transformer.py
index da169786cd3..c556f374104 100644
--- a/python/paddle/jit/dy2static/cast_transformer.py
+++ b/python/paddle/jit/dy2static/cast_transformer.py
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from paddle.jit.dy2static.static_analysis import AstNodeWrapper
 from paddle.jit.dy2static.utils import ast_to_source_code
 from paddle.utils import gast
 
@@ -26,15 +25,12 @@ class CastTransformer(BaseTransformer):
     This class transforms type casting into Static Graph Ast.
     """
 
-    def __init__(self, wrapper_root):
-        assert isinstance(
-            wrapper_root, AstNodeWrapper
-        ), "Input non-AstNodeWrapper node for the initialization of CastTransformer."
-        self._root = wrapper_root.node
+    def __init__(self, root):
+        self.root = root
         self._castable_type = {'bool', 'int', 'float'}
 
     def transform(self):
-        self.visit(self._root)
+        self.visit(self.root)
 
     def visit_Call(self, node):
         self.generic_visit(node)
diff --git a/python/paddle/jit/dy2static/create_variable_transformer.py b/python/paddle/jit/dy2static/create_variable_transformer.py
index 4290b589631..f0d5583834b 100644
--- a/python/paddle/jit/dy2static/create_variable_transformer.py
+++ b/python/paddle/jit/dy2static/create_variable_transformer.py
@@ -13,7 +13,6 @@
 # limitations under the License.
 
 from .base_transformer import BaseTransformer
-from .static_analysis import AstNodeWrapper
 from .utils import FunctionNameLivenessAnalysis
 from .variable_trans_func import create_undefined_var
 
@@ -23,12 +22,8 @@ __all__ = []
 class CreateVariableTransformer(BaseTransformer):
     """ """
 
-    def __init__(self, wrapper_root):
-        assert isinstance(wrapper_root, AstNodeWrapper), (
-            "Type of input node should be AstNodeWrapper, but received %s ."
-            % type(wrapper_root)
-        )
-        self.root = wrapper_root.node
+    def __init__(self, root):
+        self.root = root
         FunctionNameLivenessAnalysis(self.root)
 
     def transform(self):
diff --git a/python/paddle/jit/dy2static/decorator_transformer.py b/python/paddle/jit/dy2static/decorator_transformer.py
index f7391f301db..a61c25dd608 100644
--- a/python/paddle/jit/dy2static/decorator_transformer.py
+++ b/python/paddle/jit/dy2static/decorator_transformer.py
@@ -19,7 +19,6 @@ import warnings
 from paddle.utils import gast
 
 from .base_transformer import BaseTransformer
-from .static_analysis import AstNodeWrapper
 from .utils import RE_PYMODULE, RE_PYNAME, ast_to_source_code
 
 __all__ = []
@@ -40,12 +39,8 @@ class DecoratorTransformer(BaseTransformer):
     Transform decorators.
     """
 
-    def __init__(self, wrapper_root):
-        assert isinstance(wrapper_root, AstNodeWrapper), (
-            "Type of input node should be AstNodeWrapper, but received %s ."
-            % type(wrapper_root)
-        )
-        self.root = wrapper_root.node
+    def __init__(self, root):
+        self.root = root
 
         self.ancestor_nodes = []
 
diff --git a/python/paddle/jit/dy2static/early_return_transformer.py b/python/paddle/jit/dy2static/early_return_transformer.py
index fd2b7865305..4613f2b6ecb 100644
--- a/python/paddle/jit/dy2static/early_return_transformer.py
+++ b/python/paddle/jit/dy2static/early_return_transformer.py
@@ -15,7 +15,6 @@
 from paddle.utils import gast
 
 from .base_transformer import BaseTransformer
-from .static_analysis import AstNodeWrapper
 
 __all__ = []
 
@@ -25,12 +24,8 @@ class EarlyReturnTransformer(BaseTransformer):
     Transform if/else return statement of Dygraph into Static Graph.
     """
 
-    def __init__(self, wrapper_root):
-        assert isinstance(wrapper_root, AstNodeWrapper), (
-            "Type of input node should be AstNodeWrapper, but received %s ."
-            % type(wrapper_root)
-        )
-        self.root = wrapper_root.node
+    def __init__(self, root):
+        self.root = root
 
     def transform(self):
         """
diff --git a/python/paddle/jit/dy2static/ifelse_transformer.py b/python/paddle/jit/dy2static/ifelse_transformer.py
index ba64b246b35..0986bc1933d 100644
--- a/python/paddle/jit/dy2static/ifelse_transformer.py
+++ b/python/paddle/jit/dy2static/ifelse_transformer.py
@@ -16,7 +16,6 @@ import copy
 from collections import defaultdict
 
 from paddle.fluid import unique_name
-from paddle.jit.dy2static.static_analysis import AstNodeWrapper
 from paddle.jit.dy2static.utils import (
     FOR_ITER_INDEX_PREFIX,
     FOR_ITER_ITERATOR_PREFIX,
@@ -57,12 +56,8 @@ class IfElseTransformer(BaseTransformer):
     Transform if/else statement of Dygraph into Static Graph.
     """
 
-    def __init__(self, wrapper_root):
-        assert isinstance(wrapper_root, AstNodeWrapper), (
-            "Type of input node should be AstNodeWrapper, but received %s ."
-            % type(wrapper_root)
-        )
-        self.root = wrapper_root.node
+    def __init__(self, root):
+        self.root = root
         FunctionNameLivenessAnalysis(
             self.root
         )  # name analysis of current ast tree.
diff --git a/python/paddle/jit/dy2static/logical_transformer.py b/python/paddle/jit/dy2static/logical_transformer.py
index a31ddcd44e9..90002c6e4bd 100644
--- a/python/paddle/jit/dy2static/logical_transformer.py
+++ b/python/paddle/jit/dy2static/logical_transformer.py
@@ -48,9 +48,8 @@ class LogicalTransformer(BaseTransformer):
         a = _jst.And(lambda:x>1, lambda:y<1)
     """
 
-    def __init__(self, wrapper_root):
-        self.wrapper_root = wrapper_root
-        self.root = wrapper_root.node
+    def __init__(self, root):
+        self.root = root
 
     def transform(self):
         return self.visit(self.root)
diff --git a/python/paddle/jit/dy2static/loop_transformer.py b/python/paddle/jit/dy2static/loop_transformer.py
index cabb1d41c94..043d5be4b76 100644
--- a/python/paddle/jit/dy2static/loop_transformer.py
+++ b/python/paddle/jit/dy2static/loop_transformer.py
@@ -24,7 +24,7 @@ from .base_transformer import (
     ForNodeVisitor,
 )
 from .ifelse_transformer import ARGS_NAME
-from .static_analysis import AstNodeWrapper, NodeVarType, StaticAnalysisVisitor
+from .static_analysis import NodeVarType, StaticAnalysisVisitor
 from .utils import (
     FOR_BODY_PREFIX,
     FOR_CONDITION_PREFIX,
@@ -507,16 +507,12 @@ class LoopTransformer(BaseTransformer):
     This class transforms python while/for statement into Static Graph Ast
     """
 
-    def __init__(self, wrapper_root):
-        assert isinstance(
-            wrapper_root, AstNodeWrapper
-        ), "Input non-AstNodeWrapper node for the initialization of LoopTransformer."
-        self.wrapper_root = wrapper_root
-        self.root = wrapper_root.node
+    def __init__(self, root):
+        self.root = root
         FunctionNameLivenessAnalysis(self.root)
 
     def transform(self):
-        ForLoopTuplePreTransformer(self.wrapper_root).transform()
+        ForLoopTuplePreTransformer(self.root).transform()
         self.visit(self.root)
 
     def visit_While(self, node):
diff --git a/python/paddle/jit/dy2static/program_translator.py b/python/paddle/jit/dy2static/program_translator.py
index 38801a36606..44d16ae5b7c 100644
--- a/python/paddle/jit/dy2static/program_translator.py
+++ b/python/paddle/jit/dy2static/program_translator.py
@@ -132,17 +132,17 @@ class FunctionCache:
         #  but actually they are methods in different classes.
         #  Maybe use (__class__, source_code) as key
         if source_code in self._code_to_ast_caches:
-            root_wrapper = self._code_to_ast_caches[source_code]
+            root = self._code_to_ast_caches[source_code]
         else:
             root = gast.parse(source_code)
             root = attach_origin_info(root, func)
-            root_wrapper = self._dygraph_to_static.get_static_ast(root)
-            self._code_to_ast_caches[source_code] = root_wrapper
+            root = self._dygraph_to_static.get_static_ast(root)
+            self._code_to_ast_caches[source_code] = root
 
         # Get static function from AST
-        static_func, file_name = ast_to_func(root_wrapper.node, func)
+        static_func, file_name = ast_to_func(root, func)
 
-        create_and_update_origin_info_map(root_wrapper.node, static_func)
+        create_and_update_origin_info_map(root, static_func)
         return static_func
 
     def exist(self, func):
@@ -1680,10 +1680,10 @@ class ProgramTranslator:
 
         # Transform AST
         dygraph_to_static = DygraphToStaticAst()
-        root_wrapper = dygraph_to_static.get_static_ast(root)
+        root = dygraph_to_static.get_static_ast(root)
 
         # Get source_code
-        source_code = ast_to_source_code(root_wrapper.node)
+        source_code = ast_to_source_code(root)
         return source_code
 
     def get_program_cache(self):
diff --git a/python/paddle/jit/dy2static/return_transformer.py b/python/paddle/jit/dy2static/return_transformer.py
index 48d48f949dc..e16608fc446 100644
--- a/python/paddle/jit/dy2static/return_transformer.py
+++ b/python/paddle/jit/dy2static/return_transformer.py
@@ -130,9 +130,8 @@ class ReturnTransformer(BaseTransformer):
     SingleReturnTransformer don't care the nested function def.
     """
 
-    def __init__(self, wrapper_root):
-        self.wrapper_root = wrapper_root
-        self.root = wrapper_root.node
+    def __init__(self, root):
+        self.root = root
         pre_transformer = ReplaceReturnNoneTransformer(self.root)
         pre_transformer.transform()
 
diff --git a/python/paddle/jit/dy2static/tensor_shape_transformer.py b/python/paddle/jit/dy2static/tensor_shape_transformer.py
index 6efff3b0561..13b81608f79 100644
--- a/python/paddle/jit/dy2static/tensor_shape_transformer.py
+++ b/python/paddle/jit/dy2static/tensor_shape_transformer.py
@@ -15,7 +15,6 @@
 from paddle.utils import gast
 
 from .base_transformer import BaseTransformer
-from .static_analysis import AstNodeWrapper
 from .utils import ast_to_source_code
 
 __all__ = []
@@ -27,12 +26,8 @@ class TensorShapeTransformer(BaseTransformer):
     All 'xxx.shape' will be converted int '_jst.Shape(x)'.
     """
 
-    def __init__(self, wrapper_root):
-        assert isinstance(
-            wrapper_root, AstNodeWrapper
-        ), "Input non-AstNodeWrapper node for the initialization of TensorShapeTransformer."
-        self.wrapper_root = wrapper_root
-        self.root = wrapper_root.node
+    def __init__(self, root):
+        self.root = root
 
     def transform(self):
         self.visit(self.root)
diff --git a/python/paddle/jit/dy2static/tensorhook_transformer.py b/python/paddle/jit/dy2static/tensorhook_transformer.py
index ff0c4b67ca1..9add0c9d825 100644
--- a/python/paddle/jit/dy2static/tensorhook_transformer.py
+++ b/python/paddle/jit/dy2static/tensorhook_transformer.py
@@ -20,10 +20,10 @@ from .base_transformer import BaseTransformer
 
 
 class RegisterHookTransformer(BaseTransformer):
-    def __init__(self, wrapper_root):
+    def __init__(self, root):
         self.register_hook_pos_map = collections.defaultdict(list)
         self.assignment_pos_map = collections.defaultdict(list)
-        self.root = wrapper_root.node
+        self.root = root
 
     def transform(self):
         """
diff --git a/python/paddle/jit/dy2static/typehint_transformer.py b/python/paddle/jit/dy2static/typehint_transformer.py
index 68a395973ca..da2f625ce5a 100644
--- a/python/paddle/jit/dy2static/typehint_transformer.py
+++ b/python/paddle/jit/dy2static/typehint_transformer.py
@@ -13,8 +13,6 @@
 # limitations under the License.
 
 
-from paddle.jit.dy2static.static_analysis import AstNodeWrapper
-
 from .base_transformer import BaseTransformer
 
 __all__ = []
@@ -26,12 +24,8 @@ class TypeHintTransformer(BaseTransformer):
     Please put it behind other transformers because other transformer may relay on typehints.
     """
 
-    def __init__(self, wrapper_root):
-        assert isinstance(
-            wrapper_root, AstNodeWrapper
-        ), "Input non-AstNodeWrapper node for the initialization of TypeHintTransformer."
-        self.wrapper_root = wrapper_root
-        self.root = wrapper_root.node
+    def __init__(self, root):
+        self.root = root
 
     def transform(self):
         self.visit(self.root)
diff --git a/test/dygraph_to_static/test_origin_info.py b/test/dygraph_to_static/test_origin_info.py
index 90436f6d72b..2ae8aa80398 100644
--- a/test/dygraph_to_static/test_origin_info.py
+++ b/test/dygraph_to_static/test_origin_info.py
@@ -96,7 +96,7 @@ class TestOriginInfo(unittest.TestCase):
         dygraph_ast = attach_origin_info(dygraph_ast, self.dygraph_func)
 
         # step2
-        transformed_ast = DygraphToStaticAst().get_static_ast(dygraph_ast).node
+        transformed_ast = DygraphToStaticAst().get_static_ast(dygraph_ast)
 
         # step3
         self.static_func, _ = ast_to_func(transformed_ast, self.dygraph_func)
-- 
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