TF：利用sklearn自带数据集使用dropout解决学习中overfitting的问题+Tensorboard显示变化曲线—Jason niu

import tensorflow as tf

from sklearn.datasets import load_digits

#from sklearn.cross_validation import train_test_split

from sklearn.model_selection import train_test_split

from sklearn.preprocessing import LabelBinarizer

# load data

digits = load_digits()  X = digits.data

y = digits.target

y = LabelBinarizer().fit_transform(y)

X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=.3)

def add_layer(inputs, in_size, out_size, layer_name, activation_function=None, ):

    # add one more layer and return the output of this layer

    Weights = tf.Variable(tf.random_normal([in_size, out_size]))

    biases = tf.Variable(tf.zeros([1, out_size]) + 0.1, )

    Wx_plus_b = tf.matmul(inputs, Weights) + biases

    # here to dropout

    Wx_plus_b = tf.nn.dropout(Wx_plus_b, keep_prob)

    if activation_function is None:

        outputs = Wx_plus_b

    else:

        outputs = activation_function(Wx_plus_b, )

    tf.summary.histogram(layer_name + '/outputs', outputs)

    return outputs

# define placeholder for inputs to network

keep_prob = tf.placeholder(tf.float32)

xs = tf.placeholder(tf.float32, [None, 64])

ys = tf.placeholder(tf.float32, [None, 10])

# add output layer

l1 = add_layer(xs, 64, 50, 'l1', activation_function=tf.nn.tanh)

prediction = add_layer(l1, 50, 10, 'l2', activation_function=tf.nn.softmax) 

# the loss between prediction and real data

cross_entropy = tf.reduce_mean(-tf.reduce_sum(ys * tf.log(prediction),

                                              reduction_indices=[1]))

tf.summary.scalar ('loss', cross_entropy)

train_step = tf.train.GradientDescentOptimizer(0.5).minimize(cross_entropy) 

sess = tf.Session()

merged =  tf.summary.merge_all()

# summary writer goes in here

train_writer = tf.summary.FileWriter("logs4/train", sess.graph)

test_writer = tf.summary.FileWriter("logs4/test", sess.graph)    

sess.run(tf.global_variables_initializer()) 

for i in range(500):

    # here to determine the keeping probability

    sess.run(train_step, feed_dict={xs: X_train, ys: y_train, keep_prob: 0.5})

    if i % 50 == 0:

        # record loss

        train_result = sess.run(merged, feed_dict={xs: X_train, ys: y_train, keep_prob: 1})

        test_result = sess.run(merged, feed_dict={xs: X_test, ys: y_test, keep_prob: 1})

        train_writer.add_summary(train_result, i)

        test_writer.add_summary(test_result, i)