Python tensorflow.get_variable函数代码示例

    def __init__(self, is_training, config):
        self.batch_size = batch_size = config.batch_size
        size = config.hidden_size
        self.max_len = max_len = config.max_len
        vocab_size = config.vocab_size

        self._input_data = tf.placeholder(tf.int32, [batch_size, config.max_len])
        self._targets = tf.placeholder(tf.int32, [batch_size])

        embedding = tf.get_variable("embedding", [vocab_size, size])
        inputs = tf.nn.embedding_lookup(embedding, self._input_data)

        output = tf.reduce_sum(inputs, 1)
        softmax_w = tf.get_variable("softmax_w", [size, 2])
        softmax_b = tf.get_variable("softmax_b", [2])
        
        logits = tf.matmul(output, softmax_w) + softmax_b
        prediction = tf.nn.softmax(logits)
        self._prediction = prediction

        loss = tf.nn.sparse_softmax_cross_entropy_with_logits(logits, self._targets)
        
        self._cost = cost = tf.reduce_sum(loss) / batch_size

        if not is_training:
            return

        self._lr = tf.Variable(0.0, trainable=False)
        tvars = tf.trainable_variables()
        grads, _ = tf.clip_by_global_norm(tf.gradients(cost, tvars),
                                          config.max_grad_norm)
        optimizer = tf.train.GradientDescentOptimizer(self.lr)
        self._train_op = optimizer.apply_gradients(zip(grads, tvars))

    def __call__(self, inputs, state, scope=None):
        """Long short-term memory cell (LSTM)."""
        with tf.variable_scope(scope or type(self).__name__):  # "BasicLSTMCell"
            # Parameters of gates are concatenated into one multiply for efficiency.
            if self._state_is_tuple:
                c, h = state
            else:
                c, h = array_ops.split(1, 2, state)
            concat = _linear([inputs, h], 4 * self._num_units, True, 0.,
                             self.weights_init, self.trainable, self.restore,
                             self.reuse)

            # i = input_gate, j = new_input, f = forget_gate, o = output_gate
            i, j, f, o = array_ops.split(1, 4, concat)

            new_c = (c * self._inner_activation(f + self._forget_bias) +
                     self._inner_activation(i) *
                     self._activation(j))
            new_h = self._activation(new_c) * self._inner_activation(o)

            if self._state_is_tuple:
                new_state = _rnn_cell.LSTMStateTuple(new_c, new_h)
            else:
                new_state = array_ops.concat(1, [new_c, new_h])

            # Retrieve RNN Variables
            with tf.variable_scope('Linear', reuse=True):
                self.W = tf.get_variable('Matrix')
                self.b = tf.get_variable('Bias')

            return new_h, new_state

def get_run_op():
  # Create an optimizer that performs gradient descent.
  #opt = tf.train.GradientDescentOptimizer(learning_rate=0.01)
  slice_size = FLAGS.batch_size / FLAGS.num_cuts
  print('Slice size:{}'.format(slice_size))
  data = None
  label = None
  last_fc = [tf.no_op()]
  with tf.device('/gpu:0'):
    data = tf.get_variable(
        name = 'data',
        shape=[slice_size, FLAGS.hidden_size],
        trainable=False)
    '''
    label = tf.get_variable(
        name = 'label',
        shape = [slice_size, FLAGS.hidden_size],
        trainable=False))
    with tf.variable_scope('fc_in'):
      weight_in = tf.zeros([1000, FLAGS.hidden_size])
      for k in xrange(FLAGS.num_cuts):
        with tf.control_dependencies([last_fc[-1]]):
            last_fc.append(tf.matmul(data[k+1], weight_in))
    '''
  for i in xrange(FLAGS.num_cuts):
    last_fc.append(data)
  for i in xrange(FLAGS.num_layers):
    dev = '/gpu:%d' % (i * FLAGS.num_gpus / FLAGS.num_layers)
    with tf.device(dev), scopes.arg_scope([variables.variable], device=dev):
      tmp_fc = [tf.no_op()]
      with tf.variable_scope('fc%d' % i):
        w = tf.get_variable(
            name='w',
            shape=[FLAGS.hidden_size, FLAGS.hidden_size],
            trainable=True)
        for k in xrange(FLAGS.num_cuts):
          with tf.control_dependencies([tmp_fc[-1]]):
            tmp_fc.append(tf.matmul(last_fc[k+1], w))
      last_fc = tmp_fc
      if i == FLAGS.num_layers - 1:
        with tf.control_dependencies(last_fc):
          train_op = tf.no_op()
  '''
  with tf.device('/gpu:%d' % (FLAGS.num_gpus - 1)):
    tmp_fc = [tf.no_op()]
    with tf.variable_scope('fc_out'):
      weight_out = tf.zeros([FLAGS.hidden_size, 1000])
      for k in xrange(FLAGS.num_cuts):
        with tf.control_dependencies([tmp_fc[-1]]):
          tmp_fc.append(tf.matmul(last_fc[k+1], weight_out))
    last_fc = tmp_fc
  loss = tf.nn_softmax_cross_entropy_with_logits(last_fc, labels, name='xentropy')
  grads = opt.compute_gradients(loss)
  apply_gradient_op = opt.apply_gradients(grads)

  train_op = tf.group(apply_gradient_op)
  '''
  init_op = tf.initialize_all_variables()

  return init_op, train_op

def wide_model(numeric_input, category_input, vocabs):
    transpose_category_input = tf.transpose(category_input)
    category_sum = None
    # Append embadding category to numeric_sum
    for i in range(0, len(vocabs)):
        embedding = tf.get_variable("wideem" + str(i), [vocabs[i], 8],
                                    initializer=tf.contrib.layers.xavier_initializer()
                                    #partitioner=tf.fixed_size_partitioner(n_pss))
                                    #partitioner=tf.min_max_variable_partitioner(n_pss, 0, 2 << 10)
                                    )
        # Pick one column from category input
        col = tf.gather(transpose_category_input, [i])[0]
        #col = tf.nn.embedding_lookup(transpose_category_input, [i])[0]

        # Same as make [0001]*[w1,w2,w3,w4] = lookup w4
        #embedded_col = embedding_lookup(tf.identity(embedding), col)  # number * embedding output number
        embedded_col = embedding_ops.embedding_lookup_unique(embedding, col)

        if category_sum is None:
            category_sum = embedded_col
        else:
            category_sum = tf.concat([category_sum, embedded_col], 1)

    tf.set_random_seed(1)
    w = tf.get_variable("W", [numeric_input.shape[1] + category_sum.shape[1], 1], initializer=tf.contrib.layers.xavier_initializer())
    wmodel_logits_sum = tf.matmul(tf.concat([numeric_input, category_sum], 1), w)

    return wmodel_logits_sum

    def loss(self, logits, labels):
        """Adds loss ops to the computational graph.

        Hint: Use sparse_softmax_cross_entropy_with_logits
        Hint: Remember to add l2_loss (see tf.nn.l2_loss)
        Args:
            logits: tensor(num_nodes, output_size)
            labels: python list, len = num_nodes
        Returns:
            loss: tensor 0-D
        """
        loss = None
        # YOUR CODE HERE
        labels = tf.convert_to_tensor(labels, dtype=tf.int64)
        softmax_loss = tf.nn.sparse_softmax_cross_entropy_with_logits(logits, labels)

        l2 = self.config.l2
        with tf.variable_scope('Composition', reuse=True):
            W1 = tf.get_variable("W1")
        with tf.variable_scope('Projection', reuse=True):
            U = tf.get_variable("U")
        l2_loss = tf.nn.l2_loss(W1) + tf.nn.l2_loss(U)
        l2_loss *= l2

        loss = tf.reduce_sum(softmax_loss) + l2_loss
        # END YOUR CODE
        return loss

def init():
    d_model = 512
    d_k = 64
    d_v = 64
    sequence_length =6 #5
    decoder_sent_length=6
    h = 8
    batch_size = 4*32
    num_layer=6
    # 2.set Q,K,V
    vocab_size = 1000
    embed_size = d_model
    initializer = tf.random_normal_initializer(stddev=0.1)
    Embedding = tf.get_variable("Embedding_d", shape=[vocab_size, embed_size], initializer=initializer)
    decoder_input_x = tf.placeholder(tf.int32, [batch_size, decoder_sent_length], name="input_x")  # [4,10]
    print("1.decoder_input_x:", decoder_input_x)
    decoder_input_embedding = tf.nn.embedding_lookup(Embedding, decoder_input_x)  # [batch_size*sequence_length,embed_size]
    #Q = embedded_words  # [batch_size*sequence_length,embed_size]
    #K_s = embedded_words  # [batch_size*sequence_length,embed_size]
    #K_v_encoder = tf.placeholder(tf.float32, [batch_size,decoder_sent_length, d_model], name="input_x") #sequence_length
    Q = tf.placeholder(tf.float32, [batch_size,sequence_length, d_model], name="input_x")
    K_s=decoder_input_embedding
    K_v_encoder= tf.get_variable("v_variable",shape=[batch_size,decoder_sent_length, d_model],initializer=initializer) #tf.float32,
    print("2.output from encoder:",K_v_encoder)
    mask = get_mask(decoder_sent_length) #sequence_length
    decoder = Decoder(d_model, d_k, d_v, sequence_length, h, batch_size, Q, K_s, K_v_encoder,decoder_sent_length,mask=mask,num_layer=num_layer)
    return decoder,Q, K_s

	def _initialize_weights(self):
		all_weights = dict()
		# Encoding layers
		for i, n_hidden in enumerate(self.hidden_units):
			weight_name = 'encoder%d_W' % i
			bias_name = 'encoder%d_b' % i
			if i == 0:
				weight_shape = [self.n_input, n_hidden]
			else:
				weight_shape = [self.hidden_units[i-1], n_hidden]

			all_weights[weight_name] = tf.get_variable(weight_name, weight_shape, 
				initializer=tf.contrib.layers.xavier_initializer())
			all_weights[bias_name] = tf.get_variable(bias_name, [n_hidden],
				initializer=tf.constant_initializer(0.0))
		
		# Decoding layers
		hidden_units_rev = self.hidden_units[::-1]
		for i, n_hidden in enumerate(hidden_units_rev):
			weight_name = 'decoder%d_W' % i
			bias_name = 'decoder%d_b' % i
			if i != len(hidden_units_rev) - 1: # not the last layer
				weight_shape = [n_hidden, hidden_units_rev[i+1]]
			else:
				weight_shape = [n_hidden, self.n_input]

			all_weights[weight_name] = tf.get_variable(weight_name, weight_shape, 
				initializer=tf.contrib.layers.xavier_initializer())
			all_weights[bias_name] = tf.get_variable(bias_name, [n_hidden],
				initializer=tf.constant_initializer(0.0))

		return all_weights

def _batch_norm(x, name, is_train):
    """ Apply a batch normalization layer. """
    with tf.variable_scope(name):
        inputs_shape = x.get_shape()
        axis = list(range(len(inputs_shape) - 1))
        param_shape = int(inputs_shape[-1])

        moving_mean = tf.get_variable('mean', [param_shape], initializer=tf.constant_initializer(0.0), trainable=False)
        moving_var = tf.get_variable('variance', [param_shape], initializer=tf.constant_initializer(1.0), trainable=False)

        beta = tf.get_variable('offset', [param_shape], initializer=tf.constant_initializer(0.0))
        gamma = tf.get_variable('scale', [param_shape], initializer=tf.constant_initializer(1.0))

        control_inputs = []

        def mean_var_with_update():
            mean, var = tf.nn.moments(x, axis)
            update_moving_mean = moving_averages.assign_moving_average(moving_mean, mean, 0.995)
            update_moving_var = moving_averages.assign_moving_average(moving_var, var, 0.995)
            control_inputs = [update_moving_mean, update_moving_var]
            return tf.identity(mean), tf.identity(var)

        def mean_var():
            mean = moving_mean
            var = moving_var            
            return tf.identity(mean), tf.identity(var)

        mean, var = tf.cond(is_train, mean_var_with_update, mean_var)

        with tf.control_dependencies(control_inputs):
            normed = tf.nn.batch_normalization(x, mean, var, beta, gamma, 1e-4)

    return normed

    def __init__(self, epsilon=1e-2, shape=()):

        self._sum = tf.get_variable(
            dtype=tf.float64,
            shape=shape,
            initializer=tf.constant_initializer(0.0),
            name="runningsum", trainable=False)
        self._sumsq = tf.get_variable(
            dtype=tf.float64,
            shape=shape,
            initializer=tf.constant_initializer(epsilon),
            name="runningsumsq", trainable=False)
        self._count = tf.get_variable(
            dtype=tf.float64,
            shape=(),
            initializer=tf.constant_initializer(epsilon),
            name="count", trainable=False)
        self.shape = shape

        self.mean = tf.to_float(self._sum / self._count)
        self.std = tf.sqrt( tf.maximum( tf.to_float(self._sumsq / self._count) - tf.square(self.mean) , 1e-2 ))

        newsum = tf.placeholder(shape=self.shape, dtype=tf.float64, name='sum')
        newsumsq = tf.placeholder(shape=self.shape, dtype=tf.float64, name='var')
        newcount = tf.placeholder(shape=[], dtype=tf.float64, name='count')
        self.incfiltparams = U.function([newsum, newsumsq, newcount], [],
            updates=[tf.assign_add(self._sum, newsum),
                     tf.assign_add(self._sumsq, newsumsq),
                     tf.assign_add(self._count, newcount)])

  def add_projection(self, rnn_outputs):
    """Adds a projection layer.

    The projection layer transforms the hidden representation to a distribution
    over the vocabulary.

    Hint: Here are the dimensions of the variables you will need to
          create 
          
          U:   (hidden_size, len(vocab))
          b_2: (len(vocab),)

    Args:
      rnn_outputs: List of length num_steps, each of whose elements should be
                   a tensor of shape (batch_size, embed_size).
    Returns:
      outputs: List of length num_steps, each a tensor of shape
               (batch_size, len(vocab)
    """
    ### YOUR CODE HERE
    with tf.name_scope('Projection Layer'):
      U = tf.get_variable('U', [self.config.hidden_size, len(self.vocab)])
      b2 = tf.get_variable('b2', len(self.vocab))
      outputs = [tf.nn.softmax(tf.matmul(o,U)+b2) for o in rnn_outputs]
    ### END YOUR CODE
    return outputs

def logistic_regression(X, y, class_weight=None):
    """Creates logistic regression TensorFlow subgraph.

    Args:
        X: tensor or placeholder for input features,
           shape should be [batch_size, n_features].
        y: tensor or placeholder for target,
           shape should be [batch_size, n_classes].
        class_weight: tensor, [n_classes], where for each class
                      it has weight of the class. If not provided
                      will check if graph contains tensor `class_weight:0`.
                      If that is not provided either all ones are used.

    Returns:
        Predictions and loss tensors.
    """
    with tf.variable_scope('logistic_regression'):
        tf.histogram_summary('logistic_regression.X', X)
        tf.histogram_summary('logistic_regression.y', y)
        weights = tf.get_variable('weights', [X.get_shape()[1],
                                              y.get_shape()[-1]])
        bias = tf.get_variable('bias', [y.get_shape()[-1]])
        tf.histogram_summary('logistic_regression.weights', weights)
        tf.histogram_summary('logistic_regression.bias', bias)
        # If no class weight provided, try to retrieve one from pre-defined
        # tensor name in the graph.
        if not class_weight:
            try:
                class_weight = tf.get_default_graph().get_tensor_by_name('class_weight:0')
            except KeyError:
                pass
        return softmax_classifier(X, y, weights, bias,
                                  class_weight=class_weight)

  def testVarOpScopeOuterScope(self):
    with self.test_session():
      with tf.variable_scope("outer") as outer:
        pass
      with tf.variable_op_scope([], outer, "default"):
        self.assertEqual(tf.get_variable("w", []).name,
                         "outer/w:0")
        with tf.name_scope("scope2") as sc2:
          self.assertEqual(sc2, "outer_1/scope2/")
        with tf.variable_op_scope([], None, "default"):
          self.assertEqual(tf.get_variable("w", []).name,
                           "outer/default/w:0")
          with tf.name_scope("scope2") as sc2:
            self.assertEqual(sc2, "outer_1/default/scope2/")

      with tf.variable_op_scope([], outer, "default", reuse=True):
        self.assertEqual(tf.get_variable("w", []).name,
                         "outer/w:0")
        with tf.name_scope("scope2") as sc2:
          self.assertEqual(sc2, "outer_2/scope2/")
        outer.reuse_variables()
        with tf.variable_op_scope([], None, "default"):
          self.assertEqual(tf.get_variable("w", []).name,
                           "outer/default/w:0")
          with tf.name_scope("scope2") as sc2:
            self.assertEqual(sc2, "outer_2/default/scope2/")

  def testVarOpScopeReuseParam(self):
    with self.test_session():
      with tf.variable_scope("outer") as outer:
        with tf.variable_op_scope([], "tower", "default"):
          self.assertEqual(tf.get_variable("w", []).name,
                           "outer/tower/w:0")
          with tf.name_scope("scope2") as sc2:
            self.assertEqual(sc2, "outer/tower/scope2/")
        with tf.variable_op_scope([], None, "default"):
          self.assertEqual(tf.get_variable("w", []).name,
                           "outer/default/w:0")
          with tf.name_scope("scope2") as sc2:
            self.assertEqual(sc2, "outer/default/scope2/")

      with tf.variable_scope(outer) as outer:
        with tf.variable_op_scope([], "tower", "default", reuse=True):
          self.assertEqual(tf.get_variable("w", []).name,
                           "outer/tower/w:0")
          with tf.name_scope("scope2") as sc2:
            self.assertEqual(sc2, "outer_1/tower/scope2/")
        outer.reuse_variables()
        with tf.variable_op_scope([], None, "default"):
          self.assertEqual(tf.get_variable("w", []).name,
                           "outer/default/w:0")
          with tf.name_scope("scope2") as sc2:
            self.assertEqual(sc2, "outer_1/default/scope2/")

  def testVarOpScope(self):
    with self.test_session():
      with tf.name_scope("scope1"):
        with tf.variable_op_scope([], "tower", "default"):
          self.assertEqual(tf.get_variable("w", []).name,
                           "tower/w:0")
          with tf.name_scope("scope2") as sc2:
            self.assertEqual(sc2, "scope1/tower/scope2/")
        with tf.variable_op_scope([], "tower", "default"):
          with self.assertRaises(ValueError):
            tf.get_variable("w", [])
          with tf.name_scope("scope2") as sc2:
            self.assertEqual(sc2, "scope1/tower_1/scope2/")

      with tf.name_scope("scope2"):
        with tf.variable_op_scope([], None, "default"):
          self.assertEqual(tf.get_variable("w", []).name,
                           "default/w:0")
          with tf.name_scope("scope2") as sc2:
            self.assertEqual(sc2, "scope2/default/scope2/")
        with tf.variable_op_scope([], None, "default"):
          self.assertEqual(tf.get_variable("w", []).name,
                           "default_1/w:0")
          with tf.name_scope("scope2") as sc2:
            self.assertEqual(sc2, "scope2/default_1/scope2/")

    def project_bilstm_layer(self, lstm_outputs, name=None):
        """
        hidden layer between lstm layer and logits
        :param lstm_outputs: [batch_size, num_steps, emb_size] 
        :return: [batch_size, num_steps, num_tags]
        """
        with tf.variable_scope("project" if not name else name):
            with tf.variable_scope("hidden"):
                W = tf.get_variable("W", shape=[self.hidden_unit * 2, self.hidden_unit],
                                    dtype=tf.float32, initializer=self.initializers.xavier_initializer())

                b = tf.get_variable("b", shape=[self.hidden_unit], dtype=tf.float32,
                                    initializer=tf.zeros_initializer())
                output = tf.reshape(lstm_outputs, shape=[-1, self.hidden_unit * 2])
                hidden = tf.tanh(tf.nn.xw_plus_b(output, W, b))

            # project to score of tags
            with tf.variable_scope("logits"):
                W = tf.get_variable("W", shape=[self.hidden_unit, self.num_labels],
                                    dtype=tf.float32, initializer=self.initializers.xavier_initializer())

                b = tf.get_variable("b", shape=[self.num_labels], dtype=tf.float32,
                                    initializer=tf.zeros_initializer())

                pred = tf.nn.xw_plus_b(hidden, W, b)
            return tf.reshape(pred, [-1, self.seq_length, self.num_labels])