1# Copyright 2015 The TensorFlow Authors. All Rights Reserved. 2# 3# Licensed under the Apache License, Version 2.0 (the "License"); 4# you may not use this file except in compliance with the License. 5# You may obtain a copy of the License at 6# 7# http://www.apache.org/licenses/LICENSE-2.0 8# 9# Unless required by applicable law or agreed to in writing, software 10# distributed under the License is distributed on an "AS IS" BASIS, 11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12# See the License for the specific language governing permissions and 13# limitations under the License. 14# ============================================================================== 15 16"""Global registry for OpDefs.""" 17 18from __future__ import absolute_import 19from __future__ import division 20from __future__ import print_function 21 22import threading 23 24from tensorflow.core.framework import op_def_pb2 25from tensorflow.python import _op_def_registry 26 27# The cache amortizes ProtoBuf serialization/deserialization overhead 28# on the language boundary. If an OpDef has been looked up, its Python 29# representation is cached. 30_cache = {} 31_cache_lock = threading.Lock() 32 33 34def get(name): 35 """Returns an OpDef for a given `name` or None if the lookup fails.""" 36 try: 37 return _cache[name] 38 except KeyError: 39 pass 40 41 with _cache_lock: 42 try: 43 # Return if another thread has already populated the cache. 44 return _cache[name] 45 except KeyError: 46 pass 47 48 serialized_op_def = _op_def_registry.get(name) 49 if serialized_op_def is None: 50 return None 51 52 op_def = op_def_pb2.OpDef() 53 op_def.ParseFromString(serialized_op_def) 54 _cache[name] = op_def 55 return op_def 56 57 58# TODO(b/141354889): Remove once there are no callers. 59def sync(): 60 """No-op. Used to synchronize the contents of the Python registry with C++.""" 61