tensorflow中可以通過配置環境變量 'TF_CPP_MIN_LOG_LEVEL' 的值，控制tensorflow是否屏蔽通知信息、警告、報錯等輸出信息。

使用方法：

import osimport tensorflow as tf os.environ['TF_CPP_MIN_LOG_LEVEL'] = '3' # or any {'0', '1', '2'}

TF_CPP_MIN_LOG_LEVEL 取值 0 ： 0也是默認值，輸出所有信息

TF_CPP_MIN_LOG_LEVEL 取值 1 ： 屏蔽通知信息

TF_CPP_MIN_LOG_LEVEL 取值 2 ： 屏蔽通知信息和警告信息

TF_CPP_MIN_LOG_LEVEL 取值 3 ： 屏蔽通知信息、警告信息和報錯信息

測試代碼：

import tensorflow as tfimport os os.environ['TF_CPP_MIN_LOG_LEVEL'] = '0'# os.environ['TF_CPP_MIN_LOG_LEVEL'] = '1'# os.environ['TF_CPP_MIN_LOG_LEVEL'] = '2'# os.environ['TF_CPP_MIN_LOG_LEVEL'] = '3' v1 = tf.constant([1.0, 2.0, 3.0], shape=[3], name='v1')v2 = tf.constant([1.0, 2.0, 3.0], shape=[3], name='v2')sumV12 = v1 + v2 with tf.Session(config=tf.ConfigProto(log_device_placement=True)) as sess: print sess.run(sumV12)

TF_CPP_MIN_LOG_LEVEL 為 0 的輸出：

2018-04-21 14:59:09.910415: W tensorflow/core/platform/cpu_feature_guard.cc:45] The TensorFlow library wasn't compiled to use SSE4.1 instructions, but these are available on your machine and could speed up CPU computations.2018-04-21 14:59:09.910442: W tensorflow/core/platform/cpu_feature_guard.cc:45] The TensorFlow library wasn't compiled to use SSE4.2 instructions, but these are available on your machine and could speed up CPU computations.2018-04-21 14:59:09.910448: W tensorflow/core/platform/cpu_feature_guard.cc:45] The TensorFlow library wasn't compiled to use AVX instructions, but these are available on your machine and could speed up CPU computations.2018-04-21 14:59:09.910453: W tensorflow/core/platform/cpu_feature_guard.cc:45] The TensorFlow library wasn't compiled to use AVX2 instructions, but these are available on your machine and could speed up CPU computations.2018-04-21 14:59:09.910457: W tensorflow/core/platform/cpu_feature_guard.cc:45] The TensorFlow library wasn't compiled to use FMA instructions, but these are available on your machine and could speed up CPU computations.2018-04-21 14:59:09.911260: I tensorflow/core/common_runtime/direct_session.cc:300] Device mapping:2018-04-21 14:59:09.911816: I tensorflow/core/common_runtime/simple_placer.cc:872] add: (Add)/job:localhost/replica:0/task:0/cpu:02018-04-21 14:59:09.911835: I tensorflow/core/common_runtime/simple_placer.cc:872] v2: (Const)/job:localhost/replica:0/task:0/cpu:02018-04-21 14:59:09.911841: I tensorflow/core/common_runtime/simple_placer.cc:872] v1: (Const)/job:localhost/replica:0/task:0/cpu:0Device mapping: no known devices.add: (Add): /job:localhost/replica:0/task:0/cpu:0v2: (Const): /job:localhost/replica:0/task:0/cpu:0v1: (Const): /job:localhost/replica:0/task:0/cpu:0[ 2. 4. 6.]

值為0也是默認的輸出，分為三部分，一個是警告信息說沒有優化加速，二是通知信息告知操作所用的設備，三是程序中代碼指定要輸出的結果信息