如何查看TensorFlow会话的默认配置选项？

Question

如何查看TensorFlow session的默认配置选项？

我知道我可以通过config参数传递配置选项初始化会话时，例如：

# Launch the graph in a session that allows soft device placement and 
# logs the placement decisions. 
sess = tf.Session(config=tf.ConfigProto(allow_soft_placement=True, 
             log_device_placement=True)) 

但我不知道如何查看默认配置选项。 tensorflow/core/protobuf/config.proto看起来不像默认选项。

Answer 1

Tensorflow 1.0.0从

pip install tensorflow-gpu 

我跑：

import tensorflow as tf 
import pprint 
p = tf.ConfigProto() 
pprint.pprint({ k:str(getattr(p,k)) for k in sorted(dir(p)) if not k.startswith('_')}) 

产生：

{'ALLOW_SOFT_PLACEMENT_FIELD_NUMBER': '7', 
'ByteSize': '<bound method ConfigProto.ByteSize of >', 
'Clear': '<bound method ConfigProto._Clear of >', 
'ClearExtension': '<bound method ConfigProto.ClearExtension of >', 
'ClearField': '<bound method ConfigProto.ClearField of >', 
'CopyFrom': '<bound method ConfigProto.CopyFrom of >', 
'DESCRIPTOR': '<google.protobuf.descriptor.Descriptor object at 0x113dbf4d0>', 
'DEVICE_COUNT_FIELD_NUMBER': '1', 
'DEVICE_FILTERS_FIELD_NUMBER': '4', 
'DeviceCountEntry': "<class 'tensorflow.core.protobuf.config_pb2.DeviceCountEntry'>", 
'DiscardUnknownFields': '<bound method ConfigProto._DiscardUnknownFields of >', 
'FindInitializationErrors': '<bound method ConfigProto.FindInitializationErrors of >', 
'FromString': '<function FromString at 0x113de2578>', 
'GPU_OPTIONS_FIELD_NUMBER': '6', 
'GRAPH_OPTIONS_FIELD_NUMBER': '10', 
'HasExtension': '<bound method ConfigProto.HasExtension of >', 
'HasField': '<bound method ConfigProto.HasField of >', 
'INTER_OP_PARALLELISM_THREADS_FIELD_NUMBER': '5', 
'INTRA_OP_PARALLELISM_THREADS_FIELD_NUMBER': '2', 
'IsInitialized': '<bound method ConfigProto.IsInitialized of >', 
'LOG_DEVICE_PLACEMENT_FIELD_NUMBER': '8', 
'ListFields': '<bound method ConfigProto.ListFields of >', 
'MergeFrom': '<bound method ConfigProto.MergeFrom of >', 
'MergeFromString': '<bound method ConfigProto.MergeFromString of >', 
'OPERATION_TIMEOUT_IN_MS_FIELD_NUMBER': '11', 
'PLACEMENT_PERIOD_FIELD_NUMBER': '3', 
'ParseFromString': '<bound method ConfigProto.ParseFromString of >', 
'RPC_OPTIONS_FIELD_NUMBER': '13', 
'RegisterExtension': '<function RegisterExtension at 0x113de2500>', 
'SESSION_INTER_OP_THREAD_POOL_FIELD_NUMBER': '12', 
'SerializePartialToString': '<bound method ConfigProto.SerializePartialToString of >', 
'SerializeToString': '<bound method ConfigProto.SerializeToString of >', 
'SetInParent': '<bound method ConfigProto.Modified of >', 
'USE_PER_SESSION_THREADS_FIELD_NUMBER': '9', 
'WhichOneof': '<bound method ConfigProto.WhichOneof of >', 
'allow_soft_placement': 'False', 
'device_count': '{}', 
'device_filters': '[]', 
'gpu_options': '', 
'graph_options': '', 
'inter_op_parallelism_threads': '0', 
'intra_op_parallelism_threads': '0', 
'log_device_placement': 'False', 
'operation_timeout_in_ms': '0', 
'placement_period': '0', 
'rpc_options': '', 
'session_inter_op_thread_pool': '[]', 
'use_per_session_threads': 'False'} 

Answer 2

它相当于protobufs的默认值的问题：https://developers.google.com/protocol-buffers/docs/proto#optional

默认值是类型特定的。通常0为数字字段，False为布尔值，空为重复字段等。