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lazy_init.py
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lazy_init.py
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# Copyright (c) 2022 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 . import framework
__all__ = ["LazyGuard"]
class LazyInitHelper:
"""
A Helper Context to trigger switching mode between dygraph and static graph mode,
and holds the startup program resource.
"""
def __init__(self):
self._state = False
self._tracer = None
self._in_guard = False
def enable(self):
"""
Switch into lazy mode.
NOTE(dev): This is a very low level API and not exposed for user.
"""
if self._state:
return
assert (
framework.in_dygraph_mode()
), "LazyInit.enable() is only available in dygraph mode."
self._state = True
def disable(self):
"""
Exit from lazy mode.
NOTE(dev): This is a very low level API and not exposed for user.
"""
if not self._state:
return
self._state = False
def __enter__(self):
"""
Switch into lazy mode and set _dygraph_tracer_ with None to convert
dygraph mode into static graph mode.
"""
self.enable()
if self._in_guard:
return
self._tracer = framework.global_var._dygraph_tracer_
framework.global_var._dygraph_tracer_ = None
self._in_guard = True
def __exit__(self, *args, **kwargs):
"""
Exit from lazy mode and recover _dygraph_tracer_.
"""
self.disable()
if not self._in_guard:
return
assert self._tracer is not None
framework.global_var._dygraph_tracer_ = self._tracer
self._tracer = None
self._in_guard = False
@property
def state(self):
return self._state
_lazy_init_helper = LazyInitHelper()
def lazy_init_helper():
global _lazy_init_helper
return _lazy_init_helper
class LazyGuard:
"""
LazyGuard is a wrapper interface for nn.Layer, it forwards the construct
process of user defined Layer. Meanwhile, it provides necessary API to
trigger EagerParamBase Lazy Initialization and get startup Program.
"""
def __enter__(self):
"""
Construct instance from class_obj by Lazy Initializing parameters.
Examples:
.. code-block:: python
from paddle import LazyGuard
from paddle.nn import Linear
with LazyGuard():
fc = LazyInit(Linear)(10, 10)
for param in fc.parameters():
param.initialize()
"""
lazy_init_helper().enable()
def __exit__(self, *args, **kwargs):
lazy_init_helper().disable()