Data

images_train = mnist.train.images
labels_train = mnist.train.labels
images_test = mnist.test.images
labels_test = mnist.test.labels

images_train_3d = np.reshape(images_train, [-1, 28, 28])
images_test_3d = np.reshape(images_test, [-1, 28, 28])

images_flip_train_3d = images_train_3d[:, :, ::-1]
images_flip_test_3d = images_test_3d[:, :, ::-1]
images_flip_train = np.reshape(images_flip_train_3d, [-1, 28*28])
images_flip_test = np.reshape(images_flip_test_3d, [-1, 28*28])

Sample Code: Target domain data are labeled.

class DA_4():
  def __init__(self):
    pass

  def weight_variable(self, name, shape):
    initializer = tf.truncated_normal_initializer(mean = 0.0, stddev = 0.01, dtype = tf.float32)
    return tf.get_variable(name, shape, initializer = initializer)

  def bias_variable(self, name, shape):
    initializer = tf.constant_initializer(value = 0.0, dtype = tf.float32)
    return tf.get_variable(name, shape, initializer = initializer)
  
  def alpha_variable(self, name):
    initializer = tf.constant_initializer(value = 0.75, dtype = tf.float32)
    return tf.get_variable(name, shape = (), initializer = initializer)
  
  def F_0(self, x, filter_size, n_filters_1, n_filters_2, n_fc, keep_prob, reuse = False):
    x_reshaped = tf.reshape(x, [-1, 28, 28, 1])
    
    with tf.variable_scope('F_0', reuse = reuse):
      w_1 = self.weight_variable('w_1', [filter_size, filter_size, 1, n_filters_1])
      b_1 = self.bias_variable('b_1', [n_filters_1])

      # conv
      conv_1 = tf.nn.conv2d(x_reshaped, w_1, strides = [1, 2, 2, 1], padding = 'SAME') + b_1
    
      # batch norm
      #batch_mean, batch_var = tf.nn.moments(conv_1, [0, 1, 2])
      #conv_1 = (conv_1 - batch_mean) / (tf.sqrt(batch_var) + 1e-10)
    
      # relu
      conv_1 = tf.nn.relu(conv_1)
    
      # max_pool
      #conv_1 = tf.nn.max_pool(conv_1, ksize = [1, 2, 2, 1], strides = [1, 2, 2, 1], padding = 'SAME')
    
      w_2 = self.weight_variable('w_2', [filter_size, filter_size, n_filters_1, n_filters_2])
      b_2 = self.bias_variable('b_2', [n_filters_2])
      
      # conv
      conv_2 = tf.nn.conv2d(conv_1, w_2, strides = [1, 2, 2, 1], padding = 'SAME') + b_2
    
      # batch norm
      batch_mean, batch_var = tf.nn.moments(conv_2, [0, 1, 2])
      conv_2 = (conv_2 - batch_mean) / (tf.sqrt(batch_var) + 1e-10)
    
      # relu
      conv_2 = tf.nn.relu(conv_2)
    
      # max_pool
      #conv_2 = tf.nn.max_pool(conv_2, ksize = [1, 2, 2, 1], strides = [1, 2, 2, 1], padding = 'SAME')
    
      conv_2_flat = tf.reshape(conv_2, [-1, 7 * 7 * n_filters_2])
    
      w_3 = self.weight_variable('w_3', [7 * 7 * n_filters_2, n_fc])
      b_3 = self.bias_variable('b_3', [n_fc])
    
      fc_1 = tf.nn.relu(tf.matmul(conv_2_flat, w_3) + b_3)
      
      # batch norm
      batch_mean, batch_var = tf.nn.moments(fc_1, [0])
    
      fc_1 = (fc_1 - batch_mean) / (tf.sqrt(batch_var) + 1e-10)
    
      # dropout
      #fc_1 = tf.nn.dropout(fc_1, keep_prob)
      
      feature = fc_1
      
    return feature

  def F_1(self, x, n_fc_1, n_fc_2, keep_prob, reuse = False):
    
    with tf.variable_scope('F_1', reuse = reuse):
      w_1 = self.weight_variable('w_1', [n_fc_1, n_fc_2])
      b_1 = self.bias_variable('b_1', [n_fc_2])
    
      fc_1 = tf.nn.relu(tf.matmul(x, w_1) + b_1)
      
      # batch norm
      batch_mean, batch_var = tf.nn.moments(fc_1, [0])
      fc_1 = (fc_1 - batch_mean) / (tf.sqrt(batch_var) + 1e-10)
    
      # dropout
      #fc_1 = tf.nn.dropout(fc_1, keep_prob)
    
      w_2 = self.weight_variable('w_2', [n_fc_2, 10])
      b_2 = self.bias_variable('b_2', [10])

      fc_2 = tf.matmul(fc_1, w_2) + b_2
      logits = fc_2
    
    return logits

  def F_2(self, x, n_fc_1, n_fc_2, keep_prob, reuse = False):
    
    with tf.variable_scope('F_2', reuse = reuse):
      w_1 = self.weight_variable('w_1', [n_fc_1, n_fc_2])
      b_1 = self.bias_variable('b_1', [n_fc_2])
    
      fc_1 = tf.nn.relu(tf.matmul(x, w_1) + b_1)
      
      # batch norm
      batch_mean, batch_var = tf.nn.moments(fc_1, [0])
      fc_1 = (fc_1 - batch_mean) / (tf.sqrt(batch_var) + 1e-10)
    
      # dropout
      #fc_1 = tf.nn.dropout(fc_1, keep_prob)
    
      w_2 = self.weight_variable('w_2', [n_fc_2, 10])
      b_2 = self.bias_variable('b_2', [10])

      fc_2 = tf.matmul(fc_1, w_2) + b_2
      logits = fc_2
    
    return logits

  def loss_cross_entropy(self, y, t):
    cross_entropy = - tf.reduce_mean(tf.reduce_sum(t * tf.log(tf.clip_by_value(y, 1e-10, 1.0)), axis = 1))
    return cross_entropy

  def loss_entropy(self, p):
    entropy = - tf.reduce_mean(tf.reduce_sum(p * tf.log(tf.clip_by_value(p, 1e-10, 1.0)), axis = 1))
    return entropy

  def loss_mutual_info(self, p):
    p_ave = tf.reduce_mean(p, axis = 0)
    h_y = -tf.reduce_sum(p_ave * tf.log(p_ave + 1e-16))
    h_y_x = - tf.reduce_mean(tf.reduce_sum(p * tf.log(tf.clip_by_value(p, 1e-10, 1.0)), axis = 1))
    mutual_info = h_y - h_y_x
    return -mutual_info

  def accuracy(self, y, t):
    correct_preds = tf.equal(tf.argmax(y, axis = 1), tf.argmax(t, axis = 1))
    accuracy = tf.reduce_mean(tf.cast(correct_preds, tf.float32))
    return accuracy

  def training(self, loss, learning_rate, var_list):
    optimizer = tf.train.AdamOptimizer(learning_rate = learning_rate)
    #optimizer = tf.train.GradientDescentOptimizer(learning_rate = learning_rate)
    train_step = optimizer.minimize(loss, var_list = var_list)
    return train_step

  def training_clipped(self, loss, learning_rate, clip_norm, var_list):
    optimizer = tf.train.AdamOptimizer(learning_rate = learning_rate)

    grads_and_vars = optimizer.compute_gradients(loss, var_list = var_list)
    clipped_grads_and_vars = [(tf.clip_by_norm(grad, clip_norm = clip_norm), \
                             var) for grad, var in grads_and_vars]
    train_step = optimizer.apply_gradients(clipped_grads_and_vars)

    return train_step

  # train 0 and 1
  def fit_0_1(self, images_train, labels_train, images_test, labels_test, \
              filter_size, n_filters_1, n_filters_2, n_fc_0, n_fc_1, \
              learning_rate, n_iter, batch_size, show_step, is_saving, model_path):

    tf.reset_default_graph()

    x = tf.placeholder(shape = [None, 28 * 28], dtype = tf.float32)
    y = tf.placeholder(shape = [None, 10], dtype = tf.float32)
    keep_prob = tf.placeholder(shape = (), dtype = tf.float32)

    feat = self.F_0(x, filter_size, n_filters_1, n_filters_2, n_fc_0, \
                      keep_prob, reuse = False)
    logits = self.F_1(feat, n_fc_0, n_fc_1, keep_prob, reuse = False)
    probs = tf.nn.softmax(logits)
    loss = self.loss_cross_entropy(probs, y)
    
    var_list_F_0 = tf.trainable_variables('F_0')
    var_list_F_1 = tf.trainable_variables('F_1')
    var_list = var_list_F_0 + var_list_F_1
    
    # Without Gradient Clipping
    train_step = self.training(loss, learning_rate, var_list)
    # With Gradient Clipping
    #train_step = self.training_clipped(loss, learning_rate, 0.1)

    acc =  self.accuracy(probs, y)
    
    init = tf.global_variables_initializer()
    saver = tf.train.Saver()

    with tf.Session() as sess:

      sess.run(init)
      
      history_loss_train = []
      history_loss_test = []
      
      history_acc_train = []
      history_acc_test = []

      for i in range(n_iter):
        # Train
        rand_index = np.random.choice(len(images_train), size = batch_size)
        x_batch = images_train[rand_index]
        y_batch = labels_train[rand_index]

        feed_dict = {x: x_batch, y: y_batch, keep_prob: 0.7}

        sess.run(train_step, feed_dict = feed_dict)

        temp_loss = sess.run(loss, feed_dict = feed_dict)
        temp_acc = sess.run(acc, feed_dict = feed_dict)

        history_loss_train.append(temp_loss)
        history_acc_train.append(temp_acc)

        if (i + 1) % show_step == 0:
          print ('-' * 15)
          print ('Iteration: ' + str(i + 1) + '  Loss: ' + str(temp_loss) + \
                '  Accuracy: ' + str(temp_acc))

        # Test
        rand_index = np.random.choice(len(images_test), size = batch_size)
        x_batch = images_test[rand_index]
        y_batch = labels_test[rand_index]

        feed_dict = {x: x_batch, y: y_batch, keep_prob: 1.0}

        temp_loss = sess.run(loss, feed_dict = feed_dict)
        temp_acc = sess.run(acc, feed_dict = feed_dict)

        history_loss_test.append(temp_loss)
        history_acc_test.append(temp_acc)

      if is_saving:
        model_path = saver.save(sess, model_path)
        print ('done saving at ', model_path)

    print ('-'* 15)    
    fig = plt.figure(figsize = (10, 3))
    ax1 = fig.add_subplot(1, 2, 1)
    ax1.plot(range(n_iter), history_loss_train, 'b-', label = 'Train')
    ax1.plot(range(n_iter), history_loss_test, 'r--', label = 'Test')
    ax1.set_title('Loss')
    ax1.legend(loc = 'upper right')

    ax2 = fig.add_subplot(1, 2, 2)
    ax2.plot(range(n_iter), history_acc_train, 'b-', label = 'Train')
    ax2.plot(range(n_iter), history_acc_test, 'r--', label = 'Test')
    ax2.set_ylim(0.0, 1.0)
    ax2.set_title('Accuracy')
    ax2.legend(loc = 'lower right')

    plt.show()

  # train 0 and 1 first then 2  
  def fit_0_1_2(self, images_train_s, labels_train_s, images_test_s, labels_test_s, \
                images_train_t, labels_train_t, images_test_t, labels_test_t, \
                filter_size, n_filters_1, n_filters_2, n_fc_0, n_fc_1, n_fc_2, \
                learning_rate, n_iter, batch_size, show_step, is_saving, model_path):

    tf.reset_default_graph()

    x = tf.placeholder(shape = [None, 28 * 28], dtype = tf.float32)
    y = tf.placeholder(shape = [None, 10], dtype = tf.float32)
    keep_prob = tf.placeholder(shape = (), dtype = tf.float32)

    feat = self.F_0(x, filter_size, n_filters_1, n_filters_2, n_fc_0, \
                      keep_prob, reuse = False)
    
    logits_1 = self.F_1(feat, n_fc_0, n_fc_1, keep_prob, reuse = False)
    probs_1 = tf.nn.softmax(logits_1)
    loss_1 = self.loss_cross_entropy(probs_1, y)

    logits_2 = self.F_2(feat, n_fc_0, n_fc_2, keep_prob, reuse = False)
    probs_2 = tf.nn.softmax(logits_2)
    loss_2 = self.loss_cross_entropy(probs_2, y)

    var_list_0 = tf.trainable_variables('F_0')
    var_list_1 = tf.trainable_variables('F_1')
    var_list_2 = tf.trainable_variables('F_2')
    
    var_list_0_1 = var_list_0 + var_list_1
    #var_list_0_2 = var_list_0 + var_list_2
    
    # Without Gradient Clipping
    train_step_1 = self.training(loss_1, learning_rate, var_list_0_1)
    train_step_2 = self.training(loss_2, learning_rate, var_list_2)
    
    # With Gradient Clipping
    #train_step_1 = self.training_clipped(loss_1, learning_rate, 0.1, var_list_0_1)
    #train_step_2 = self.training_clipped(loss_2, learning_rate, 0.1, var_list_0_2)

    acc_1 =  self.accuracy(probs_1, y)
    acc_2 =  self.accuracy(probs_2, y)
    
    init = tf.global_variables_initializer()
    saver = tf.train.Saver()

    with tf.Session() as sess:

      sess.run(init)
      
      # for 0 and 1
      history_loss_train_1 = []
      history_loss_test_1 = []
      
      history_acc_train_1 = []
      history_acc_test_1 = []

      for i in range(n_iter):
        # Train
        rand_index = np.random.choice(len(images_train_s), size = batch_size)
        x_batch = images_train_s[rand_index]
        y_batch = labels_train_s[rand_index]

        feed_dict = {x: x_batch, y: y_batch, keep_prob: 0.7}

        sess.run(train_step_1, feed_dict = feed_dict)

        temp_loss = sess.run(loss_1, feed_dict = feed_dict)
        temp_acc = sess.run(acc_1, feed_dict = feed_dict)

        history_loss_train_1.append(temp_loss)
        history_acc_train_1.append(temp_acc)

        if (i + 1) % show_step == 0:
          print ('-' * 15)
          print ('Iteration: ' + str(i + 1) + '  Loss: ' + str(temp_loss) + \
                '  Accuracy: ' + str(temp_acc))

        # Test
        rand_index = np.random.choice(len(images_test_s), size = batch_size)
        x_batch = images_test_s[rand_index]
        y_batch = labels_test_s[rand_index]

        feed_dict = {x: x_batch, y: y_batch, keep_prob: 1.0}

        temp_loss = sess.run(loss_1, feed_dict = feed_dict)
        temp_acc = sess.run(acc_1, feed_dict = feed_dict)

        history_loss_test_1.append(temp_loss)
        history_acc_test_1.append(temp_acc)

      if is_saving:
        model_path = saver.save(sess, model_path)
        print ('done saving at ', model_path)

      print ('-'* 15)    
      fig = plt.figure(figsize = (10, 3))
      ax1 = fig.add_subplot(1, 2, 1)
      ax1.plot(range(n_iter), history_loss_train_1, 'b-', label = 'Train')
      ax1.plot(range(n_iter), history_loss_test_1, 'r--', label = 'Test')
      ax1.set_title('Loss')
      ax1.legend(loc = 'upper right')

      ax2 = fig.add_subplot(1, 2, 2)
      ax2.plot(range(n_iter), history_acc_train_1, 'b-', label = 'Train')
      ax2.plot(range(n_iter), history_acc_test_1, 'r--', label = 'Test')
      ax2.set_ylim(0.0, 1.0)
      ax2.set_title('Accuracy')
      ax2.legend(loc = 'lower right')

      plt.show()
      
      # for 2  
      history_loss_train_2 = []
      history_loss_test_2 = []
      
      history_acc_train_2 = []
      history_acc_test_2 = []

      for i in range(n_iter):
        # Train
        rand_index = np.random.choice(len(images_train_t), size = batch_size)
        x_batch = images_train_t[rand_index]
        y_batch = labels_train_t[rand_index]

        feed_dict = {x: x_batch, y: y_batch, keep_prob: 0.7}

        sess.run(train_step_2, feed_dict = feed_dict)

        temp_loss = sess.run(loss_2, feed_dict = feed_dict)
        temp_acc = sess.run(acc_2, feed_dict = feed_dict)

        history_loss_train_2.append(temp_loss)
        history_acc_train_2.append(temp_acc)

        if (i + 1) % show_step == 0:
          print ('-' * 15)
          print ('Iteration: ' + str(i + 1) + '  Loss: ' + str(temp_loss) + \
                '  Accuracy: ' + str(temp_acc))

        # Test
        rand_index = np.random.choice(len(images_test_t), size = batch_size)
        x_batch = images_test_t[rand_index]
        y_batch = labels_test_t[rand_index]

        feed_dict = {x: x_batch, y: y_batch, keep_prob: 1.0}

        temp_loss = sess.run(loss_2, feed_dict = feed_dict)
        temp_acc = sess.run(acc_2, feed_dict = feed_dict)

        history_loss_test_2.append(temp_loss)
        history_acc_test_2.append(temp_acc)

      if is_saving:
        model_path = saver.save(sess, model_path)
        print ('done saving at ', model_path)

      print ('-'* 15)    
      fig = plt.figure(figsize = (10, 3))
      ax1 = fig.add_subplot(1, 2, 1)
      ax1.plot(range(n_iter), history_loss_train_2, 'b-', label = 'Train')
      ax1.plot(range(n_iter), history_loss_test_2, 'r--', label = 'Test')
      ax1.set_title('Loss')
      ax1.legend(loc = 'upper right')

      ax2 = fig.add_subplot(1, 2, 2)
      ax2.plot(range(n_iter), history_acc_train_2, 'b-', label = 'Train')
      ax2.plot(range(n_iter), history_acc_test_2, 'r--', label = 'Test')
      ax2.set_ylim(0.0, 1.0)
      ax2.set_title('Accuracy')
      ax2.legend(loc = 'lower right')

      plt.show()
      
  def predict_1(self, images, labels, filter_size, n_filters_1, n_filters_2, n_fc_0, n_fc_1, model_path):
    
    x = tf.placeholder(shape = [None, 28 * 28], dtype = tf.float32)
    y = tf.placeholder(shape = [None, 10], dtype = tf.float32)
    keep_prob = tf.placeholder(shape = (), dtype = tf.float32)
    
    feat = self.F_0(x, filter_size, n_filters_1, n_filters_2, n_fc_0, \
                      keep_prob, reuse = True)
    
    logits = self.F_1(feat, n_fc_0, n_fc_1, keep_prob, reuse = True)
    probs = tf.nn.softmax(logits)
    acc =  self.accuracy(probs, y)
    
    saver = tf.train.Saver()

    with tf.Session() as sess:
      
      saver.restore(sess, model_path)
      
      feed_dict = {x: images, y: labels, keep_prob: 1.0}
      
      print('Accuracy_1: {:.4f}'.format(sess.run(acc, feed_dict = feed_dict)))
      
      return sess.run(probs, feed_dict = feed_dict)

  def predict_2(self, images, labels, filter_size, n_filters_1, n_filters_2, n_fc_0, n_fc_2, model_path):
    
    x = tf.placeholder(shape = [None, 28 * 28], dtype = tf.float32)
    y = tf.placeholder(shape = [None, 10], dtype = tf.float32)
    keep_prob = tf.placeholder(shape = (), dtype = tf.float32)
    
    feat = self.F_0(x, filter_size, n_filters_1, n_filters_2, n_fc_0, \
                      keep_prob, reuse = True)
    
    logits = self.F_2(feat, n_fc_0, n_fc_2, keep_prob, reuse = True)
    probs = tf.nn.softmax(logits)
    acc =  self.accuracy(probs, y)
    
    saver = tf.train.Saver()

    with tf.Session() as sess:
      
      saver.restore(sess, model_path)
      
      feed_dict = {x: images, y: labels, keep_prob: 1.0}
      
      print('Accuracy_2: {:.4f}'.format(sess.run(acc, feed_dict = feed_dict)))
      
      return sess.run(probs, feed_dict = feed_dict)

Parameters

filter_size = 3
n_filters_1 = 16
n_filters_2 = 16
n_fc_0 = 128
n_fc_1 = 64
n_fc_2 = 64
learning_rate = 0.01
n_iter = 100
batch_size = 64
show_step = 50
model_path = 'datalab/model'

Output results 1

images_train_s = images_train
labels_train_s = labels_train
images_test_s = images_test
labels_test_s = labels_test

images_train_t = images_flip_train
labels_train_t = labels_train
images_test_t = images_flip_test
labels_test_t = labels_test

da_4.fit_0_1_2(images_train_s, labels_train_s, images_test_s, labels_test_s, \
               images_train_t, labels_train_t, images_test_t, labels_test_t, \
               filter_size, n_filters_1, n_filters_2, n_fc_0, n_fc_1, n_fc_2, \
               learning_rate, n_iter, batch_size, show_step, is_saving, model_path)

Output resuts 2

indices = np.random.choice(10000, 32)
# images = images_test[indices]
images = images_flip_test[indices]
labels = labels_test[indices]

prods_1 = da_4.predict_1(images, labels, filter_size, n_filters_1, n_filters_2, n_fc_0, n_fc_1, model_path)
prods_2 = da_4.predict_2(images, labels, filter_size, n_filters_1, n_filters_2, n_fc_0, n_fc_2, model_path)

print ('-' * 15)
print ('Prediction_1')
print (np.argmax(prods_1, axis = 1))
print ('Prediction_2')
print (np.argmax(prods_2, axis = 1))
print ('True')
print (np.argmax(labels, axis = 1))