从下面的代码示例开始,我可以添加一行,如下所示:
import tensorflow as tf
import numpy as np
sess = tf.InteractiveSession() #define a session
# Create 100 phony x, y data points in NumPy, y = x * 0.1 + 0.3
x_data = np.random.rand(100).astype("float32")
y_data = x_data * 0.1 + 0.3
# Try to find values for W and b that compute y_data = W * x_data + b
# (We know that W should be 0.1 and b 0.3, but Tensorflow will
# figure that out for us.)
W = tf.Variable(tf.random_uniform([1], -1.0, 1.0))
b = tf.Variable(tf.zeros([1]))
y = W * x_data + b
# Minimize the mean squared errors.
loss = tf.reduce_mean(tf.square(y - y_data))
optimizer = tf.train.GradientDescentOptimizer(0.5)
train = optimizer.minimize(loss)
# Before starting, initialize the variables. We will 'run' this first.
init = tf.initialize_all_variables()
# Launch the graph.
sess = tf.Session()
sess.run(init)
#### ----> ADD THIS LINE <---- ####
writer = tf.train.SummaryWriter("/tmp/test", sess.graph)
# Fit the line.
for step in xrange(201):
sess.run(train)
if step % 20 == 0:
print(step, sess.run(W), sess.run(b))
# Learns best fit is W: [0.1], b: [0.3]
然后从命令行运行 tensorboard,指向相应的目录。这显示了对 SummaryWriter 的完整调用。重要的是要注意以下几点:
- SummaryWriter 传递一个 Session,因此必须在创建 Session(或 InteractiveSession)之后发生
- 该 Session 可能在程序的早期创建,但是当 Session 传递给 SummaryWriter时,此时存在的图形将写入 TensorBoard 将使用的文件。