提交 50c2eb0e 编写于 作者: M minqiyang

Add tracer implementation

test=develop
上级 efb2f2ba
# Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import print_function
import six
from collections import defaultdict
from paddle.fluid import core
from paddle.fluid import framework
__all__ = ['Tracer']
def release_op(op):
del framework._imperative_tracer()._ops[op._trace_id]
class Tracer(core.Tracer):
"""
Python wrapper of imperative tracer
"""
def __init__(self, block):
super(Tracer, self).__init__(block)
self._ops = defaultdict()
self._trace_id = 0
def trace_op(self, op, stop_gradient=False):
# record op's trace id
op.iop._trace_id = self._trace_id
self._trace_id += 1
# trace op and save it
backward_refs = self.trace(op.iop, op.inputs, op.outputs, op.block.desc,
framework._current_expected_place(),
stop_gradient)
if not stop_gradient:
self._ops[op.iop._trace_id] = op
# register backward hooks and variables if needed
if len(backward_refs) > 0:
op.iop.register_backward_hooks(release_op)
op.backward_refs = defaultdict(list)
for k, v in six.iteritems(op.inputs):
if k in backward_refs:
op.backward_refs[k] = op.inputs[k]
for k, v in six.iteritems(op.outputs):
if k in backward_refs:
op.backward_refs[k] = op.outputs[k]
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