import tensorflow as tfimport numpy as np# Create 100 phony x, y data points in NumPy, y = x * 0.1 + 0.3x_data = http://www.mamicode.com/np.random.rand(100).astype(np.float32)y_data = x_data * 0.1 + 0.3# Try to find values for W and b that compute y_data = http://www.mamicode.com/W * x_data + b# (We know that W should be 0.1 and b 0.3, but TensorFlow will# figure that out for us.)W = tf.Variable(tf.random_uniform([1], -1.0, 1.0))b = tf.Variable(tf.zeros([1]))y = W * x_data + b# Minimize the mean squared errors.loss = tf.reduce_mean(tf.square(y - y_data))optimizer = tf.train.GradientDescentOptimizer(0.5)train = optimizer.minimize(loss)# Before starting, initialize the variables.  We will ‘run‘ this first.init = tf.initialize_all_variables()# Launch the graph.sess = tf.Session()sess.run(init)# Fit the line.for step in range(201):    sess.run(train)    if step % 20 == 0:        print(step, sess.run(W), sess.run(b))# Learns best fit is W: [0.1], b: [0.3]