[Dy2Static] Add convert_ifelse to run the transformed code dynamically (#24866)
* cast var in convert_logical_XX. * Add convert_ifelse function in convert_operators.py * Add logical_transformer. Remove LogicalTransformer from loop_transformer.py * Revert modified tests in PR24799(convert_while_stmt). * Comment and modify code that doesn't support `return` statement. * Remove unnecessary class: MergeAssignTransformer, NodeTestTransformer and IfConditionVisitor in ifelse_transformer.revert-24981-add_device_attr_for_regulization
liym27
6 years ago
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# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import print_function
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import gast
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from paddle.fluid.dygraph.dygraph_to_static.utils import ast_to_source_code
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class LogicalTransformer(gast.NodeTransformer):
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"""
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Transform python boolean op into Paddle logical op
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"""
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def __init__(self, wrapper_root):
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self.wrapper_root = wrapper_root
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self.root = wrapper_root.node
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def transform(self):
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return self.visit(self.root)
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def visit_UnaryOp(self, node):
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self.generic_visit(node)
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if isinstance(node.op, gast.Not):
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arg = ast_to_source_code(node.operand)
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new_node_str = "fluid.dygraph.dygraph_to_static.convert_operators.convert_logical_not({})".format(
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arg)
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# NOTE: gast.parse returns Module(body=[expr(value=...)])
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new_node = gast.parse(new_node_str).body[0].value
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return new_node
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return node
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def visit_BoolOp(self, node):
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self.generic_visit(node)
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if isinstance(node.op, gast.And):
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new_node = self._create_bool_op_node(node.values, 'and')
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elif isinstance(node.op, gast.Or):
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new_node = self._create_bool_op_node(node.values, 'or')
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else:
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raise TypeError(
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"Only supports and/or syntax in control flow if statement.")
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return new_node
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def _create_bool_op_node(self, nodes, api_type):
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assert len(
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nodes
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) > 1, "The length of BoolOp should be at least 2, but received {}.".format(
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len(nodes))
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if len(nodes) > 2:
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# Creates logic_and/logic_or node recursively.
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pre_logic_node = self._create_bool_op_node(nodes[:2], api_type)
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if len(nodes[2:]) == 1:
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post_logic_node = nodes[2]
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else:
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post_logic_node = self._create_bool_op_node(nodes[2:], api_type)
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nodes = [pre_logic_node] + [post_logic_node]
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args = [ast_to_source_code(child) for child in nodes]
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new_node_str = "fluid.dygraph.dygraph_to_static.convert_operators.convert_logical_{}(x={}, y={})".format(
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api_type, args[0], args[1])
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# NOTE: gast.parse return Module(body=[expr(...)])
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new_node = gast.parse(new_node_str).body[0].value
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return new_node
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