Es realmente sencillo ver y comprender los valores escalares en TensorBoard. Sin embargo, no está claro cómo entender los gráficos de histograma.
Por ejemplo, son los histogramas de los pesos de mi red.
(Después de corregir un error gracias a sunside) ¿Cuál es la mejor manera de interpretarlos? Los pesos de la capa 1 se ven en su mayoría planos, ¿qué significa esto?
Agregué el código de construcción de la red aquí.
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)
B1 = tf.get_variable("B1", shape=[hidden_layer_neurons],initializer=tf.random_normal_initializer())
y layer1_bias = tf.add(layer1, B1)
etf.summary.histogram("bias", layer1_bias)
input_size
para que podamos ejecutarlo y ver el resultado entensorboard
tf.nn.softmax(tf.matmul(layer3_act, W4))
.