46 lines
1.8 KiB
Python
46 lines
1.8 KiB
Python
# Copyright 2018 The TensorFlow 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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# ==============================================================================
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"""Functions related to Python memory management."""
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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# TODO(b/115366440): Delete this function when a custom OrderedDict is added
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def dismantle_ordered_dict(ordered_dict):
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"""Remove reference cycle in OrderedDict `ordered_dict`.
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Helpful for making sure the garbage collector doesn't need to run after
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using an OrderedDict.
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Args:
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ordered_dict: A `OrderedDict` object to destroy. This object is unusable
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after this function runs.
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"""
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# OrderedDict, makes a simple reference loop
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# and hides it in an __attribute in some Python versions. We don't need to
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# throw an error if we can't find it, but if we do find it we can break the
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# loop to avoid creating work for the garbage collector.
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problematic_cycle = ordered_dict.__dict__.get("_OrderedDict__root", None) # pylint: disable=protected-access
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if problematic_cycle:
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try:
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del problematic_cycle[0][:]
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except TypeError:
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# This is probably not one of the problematic Python versions. Continue
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# with the rest of our cleanup.
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pass
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