为什么即使我有日志文件，Tensorboard 也不显示任何图表？

Question

当我打开 Tensorboard 时，即使我的 Tensorboard 日志目录中有文件，我也会看到一个窗口显示“当前数据集没有处于活动状态的仪表板”。

这是我用来启动 Tensorboard 的命令

tensorboard --logdir tf_logs/

tf_logs 目录中有这些文件夹和文件

run-20190609234531
   events.out.tfevents.1560125157.BRUBIN
run-20190610010816
   events.out.tfevents.1560128897.BRUBIN
run-20190610010949
   events.out.tfevents.1560128989.BRUBIN

这是我用来创建日志文件的代码（add_summary 位于代码末尾）。

import datetime
import numpy as np
import sklearn
import tensorflow as tf

from datetime import datetime
from sklearn.datasets import fetch_california_housing
from sklearn.preprocessing import StandardScaler   

def fetch_batch(epoch, batch_index, batch_size):
    np.random.seed(epoch * n_batches + batch_index)
    indices = np.random.randint(m, size=batch_size)
    X_batch = scaled_housing_data_plus_bias[indices]
    y_batch = housing.target.reshape(-1, 1)[indices]
    return X_batch, y_batch

now = datetime.utcnow().strftime("%Y%m%d%H%M%S")
root_logdir = "tf_logs"
logdir = "{}/run-{}/".format(root_logdir, now)

housing = fetch_california_housing()
m, n = housing.data.shape
housing_data_plus_bias = np.c_[np.ones((m, 1)), housing.data]
scaler = StandardScaler(copy = True)
scaled_housing_data = scaler.fit_transform(housing.data)
scaled_housing_data_plus_bias = np.c_[np.ones((m, 1)), scaled_housing_data]

X = tf.placeholder(tf.float32, shape=(None, n + 1), name="X")
y = tf.placeholder(tf.float32, shape=(None, 1), name="y")

theta = tf.Variable(tf.random_uniform([n + 1, 1], -1.0, 1.0, seed=42), name="theta")
y_pred = tf.matmul(X, theta, name="predictions")
error = y_pred - y
mse = tf.reduce_mean(tf.square(error), name="mse")
optimizer = tf.train.GradientDescentOptimizer(learning_rate=learning_rate)
training_op = optimizer.minimize(mse)

init = tf.global_variables_initializer()

batch_size = 100
learning_rate = 0.01
n_epochs = 1000
n_batches = int(np.ceil(m / batch_size))

mse_summary = tf.summary.scalar('MSE', mse)
file_writer = tf.summary.FileWriter(logdir, tf.get_default_graph())

with tf.Session() as sess:
    sess.run(init)

    for epoch in range(n_epochs):
        for batch_index in range(n_batches):
            X_batch, y_batch = fetch_batch(epoch, batch_index, batch_size)
            if batch_index % 10 == 0:
                summary_str = mse_summary.eval(feed_dict={X: X_batch, y: y_batch}) 
                step = epoch * n_batches + batch_index

                ##### Write the Tensorboard log #####
                file_writer.add_summary(summary_str, step)  

            sess.run(training_op, feed_dict={X: X_batch, y: y_batch})

    best_theta = theta.eval()

    file_writer.close()
    sess.close()    

为什么 Tensorboard 没有显示这些图表？

Answer 1

我运行了你的代码，发现一个错误：

learning_rate = 0.01

在使用后定义。

我将其更改为在使用之前进行定义并且代码运行良好，我还运行了 tensorboard，它向我显示了图形和标量。

但是，如果这不是您的问题，我只能想到另一个问题：

您必须在 tf_logs 目录所在的目录中。