tensorflow_tutorials_03_polynomial_regression

"""Simple tutorial for using TensorFlow to compute polynomial regression.
Parag K. Mital, Jan. 2016"""
import os
os.environ['TF_CPP_MIN_LOG_LEVEL'] = '2'

# %% Imports
import numpy as np
import tensorflow as tf
import matplotlib.pyplot as plt

• 創建w型散點數據

# %% Let's create some toy data
plt.ion()
n_observations = 100
fig, ax = plt.subplots(1, 1)
xs = np.linspace(-3, 3, n_observations)
ys = np.sin(xs) + 2*np.cos(2*xs) + np.random.uniform(-0.5, 0.5, n_observations)
ax.scatter(xs, ys)
# fig.show()
# plt.draw()

• 我們將創建有不同多項式次數的多項式函數，而不是單個因子和偏差。然後，我們將瞭解每個輸入次數$X^0, X^1, X^2, ...$對最終輸出$Y$的影響。
• $Y\_pred=w_5x^5+w_4x^4+w_3x^3+w_2x^2+w_1x+b$
• $cost=\frac{1}{n\_observations -1}\sum (Y\_pred - Y)^2$

# %% tf.placeholders for the input and output of the network. Placeholders are
# variables which we need to fill in when we are ready to compute the graph.
X = tf.placeholder(tf.float32)
Y = tf.placeholder(tf.float32)

# %% Instead of a single factor and a bias, we'll create a polynomial function
# of different polynomial degrees.  We will then learn the influence that each
# degree of the input (X^0, X^1, X^2, ...) has on the final output (Y).
Y_pred = tf.Variable(tf.random_normal([1]), name='bias')
for pow_i in range(1, 5):
    W = tf.Variable(tf.random_normal([1]), name='weight_%d' % pow_i)
    Y_pred = tf.add(tf.multiply(tf.pow(X, pow_i), W), Y_pred)

# %% Loss function will measure the distance between our observations
# and predictions and average over them.
cost = tf.reduce_sum(tf.pow(Y_pred - Y, 2)) / (n_observations - 1)

# %% if we wanted to add regularization, we could add other terms to the cost,
# e.g. ridge regression has a parameter controlling the amount of shrinkage
# over the norm of activations. the larger the shrinkage, the more robust
# to collinearity.
# cost = tf.add(cost, tf.mul(1e-6, tf.global_norm([W])))

# %% Use gradient descent to optimize W,b
# Performs a single step in the negative gradient
learning_rate = 0.01
optimizer = tf.train.GradientDescentOptimizer(learning_rate).minimize(cost)

# %% We create a session to use the graph
n_epochs = 500
with tf.Session() as sess:
    # Here we tell tensorflow that we want to initialize all
    # the variables in the graph so we can use them
    sess.run(tf.global_variables_initializer())

    # Fit all training data
    prev_training_cost = 0.0
    for epoch_i in range(n_epochs):
        for (x, y) in zip(xs, ys):
            sess.run(optimizer, feed_dict={X: x, Y: y})

        training_cost = sess.run(
            cost, feed_dict={X: xs, Y: ys})
        print(training_cost)

        if epoch_i % 100 == 0:
            ax.plot(xs, Y_pred.eval(
                feed_dict={X: xs}, session=sess),
                    'k', alpha=epoch_i / n_epochs)
#             fig.show()
#             plt.draw()

        # Allow the training to quit if we've reached a minimum
        if np.abs(prev_training_cost - training_cost) < 0.000001:
            break
        prev_training_cost = training_cost
ax.set_ylim([-3, 3])
plt.ioff()
plt.show()
# fig.show()
# plt.waitforbuttonpress()