目的是在交互式环境下(如jupyter),手动设定当前会话为默认会话,从而省去每次都要显示地说明sess的繁琐,如:Tensor.ecal(session=sess)或sess.Operation.run()
只需要写成Tensor.ecal()或Operation.run()
>>> import tensorflow as tf >>> sess = tf.InteractiveSession() can't determine number of CPU cores: assuming 4 I tensorflow/core/common_runtime/local_device.cc:25] Local device intra op parallelism threads: 4 can't determine number of CPU cores: assuming 4 I tensorflow/core/common_runtime/local_session.cc:45] Local session inter op parallelism threads: 4 >>> x = tf.Variable([1.0, 2.0]) >>> a = tf.constant([3.0, 3.0]) >>> x.initializer.run() # initializer初始化了变量x 初始化了的x可以直接用run()而不需要用sess.run()来运行 >>> sub = tf.sub(x, a) # tf里的矩阵减法函数是sub(),其实写成x-a没错 >>> print(sub.eval()) # 在这里,sub.eval()相当于sess.run(sub),因为操作sub与张量sub同名了 [-2. -1.] >>> sess.close()
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