理解张量板(权重)直方图

要查看和理解 TensorBoard 中的标量值非常简单。然而，如何理解直方图还不清楚。

例如，它们是我的网络权重的直方图。

(多亏 Sunside 修复了一个 bug) 什么是最好的方法来解释这些? 第一层的权重看起来大部分是平的，这意味着什么？

我在这里添加了网络建设代码。

X = tf.placeholder(tf.float32, [None, input_size], name="input_x")
x_image = tf.reshape(X, [-1, 6, 10, 1])
tf.summary.image('input', x_image, 4)


# First layer of weights
with tf.name_scope("layer1"):
W1 = tf.get_variable("W1", shape=[input_size, hidden_layer_neurons],
initializer=tf.contrib.layers.xavier_initializer())
layer1 = tf.matmul(X, W1)
layer1_act = tf.nn.tanh(layer1)
tf.summary.histogram("weights", W1)
tf.summary.histogram("layer", layer1)
tf.summary.histogram("activations", layer1_act)


# Second layer of weights
with tf.name_scope("layer2"):
W2 = tf.get_variable("W2", shape=[hidden_layer_neurons, hidden_layer_neurons],
initializer=tf.contrib.layers.xavier_initializer())
layer2 = tf.matmul(layer1_act, W2)
layer2_act = tf.nn.tanh(layer2)
tf.summary.histogram("weights", W2)
tf.summary.histogram("layer", layer2)
tf.summary.histogram("activations", layer2_act)


# Third layer of weights
with tf.name_scope("layer3"):
W3 = tf.get_variable("W3", shape=[hidden_layer_neurons, hidden_layer_neurons],
initializer=tf.contrib.layers.xavier_initializer())
layer3 = tf.matmul(layer2_act, W3)
layer3_act = tf.nn.tanh(layer3)


tf.summary.histogram("weights", W3)
tf.summary.histogram("layer", layer3)
tf.summary.histogram("activations", layer3_act)


# Fourth layer of weights
with tf.name_scope("layer4"):
W4 = tf.get_variable("W4", shape=[hidden_layer_neurons, output_size],
initializer=tf.contrib.layers.xavier_initializer())
Qpred = tf.nn.softmax(tf.matmul(layer3_act, W4)) # Bug fixed: Qpred = tf.nn.softmax(tf.matmul(layer3, W4))
tf.summary.histogram("weights", W4)
tf.summary.histogram("Qpred", Qpred)


# We need to define the parts of the network needed for learning a policy
Y = tf.placeholder(tf.float32, [None, output_size], name="input_y")
advantages = tf.placeholder(tf.float32, name="reward_signal")


# Loss function
# Sum (Ai*logp(yi|xi))
log_lik = -Y * tf.log(Qpred)
loss = tf.reduce_mean(tf.reduce_sum(log_lik * advantages, axis=1))
tf.summary.scalar("Q", tf.reduce_mean(Qpred))
tf.summary.scalar("Y", tf.reduce_mean(Y))
tf.summary.scalar("log_likelihood", tf.reduce_mean(log_lik))
tf.summary.scalar("loss", loss)


# Learning
train = tf.train.AdamOptimizer(learning_rate=learning_rate).minimize(loss)