Python Sequential.add_output方法代码示例

# 需要导入模块: from keras.models import Sequential [as 别名]
# 或者: from keras.models.Sequential import add_output [as 别名]
def test_TensorBoard():
    import shutil
    import tensorflow as tf
    import keras.backend.tensorflow_backend as KTF
    old_session = KTF.get_session()
    filepath = './logs'
    (X_train, y_train), (X_test, y_test) = get_test_data(nb_train=train_samples,
                                                         nb_test=test_samples,
                                                         input_shape=(input_dim,),
                                                         classification=True,
                                                         nb_class=nb_class)
    y_test = np_utils.to_categorical(y_test)
    y_train = np_utils.to_categorical(y_train)

    def data_generator(train):
        if train:
            max_batch_index = len(X_train) // batch_size
        else:
            max_batch_index = len(X_test) // batch_size
        i = 0
        while 1:
            if train:
                yield (X_train[i * batch_size: (i + 1) * batch_size], y_train[i * batch_size: (i + 1) * batch_size])
            else:
                yield (X_test[i * batch_size: (i + 1) * batch_size], y_test[i * batch_size: (i + 1) * batch_size])
            i += 1
            i = i % max_batch_index

    def data_generator_graph(train):
        while 1:
            if train:
                yield {'X_vars': X_train, 'output': y_train}
            else:
                yield {'X_vars': X_test, 'output': y_test}

    # case 1 Sequential

    with tf.Graph().as_default():
        session = tf.Session('')
        KTF.set_session(session)
        model = Sequential()
        model.add(Dense(nb_hidden, input_dim=input_dim, activation='relu'))
        model.add(Dense(nb_class, activation='softmax'))
        model.compile(loss='categorical_crossentropy',
                      optimizer='sgd',
                      metrics=['accuracy'])

        tsb = callbacks.TensorBoard(log_dir=filepath, histogram_freq=1)
        cbks = [tsb]

        # fit with validation data
        model.fit(X_train, y_train, batch_size=batch_size,
                  validation_data=(X_test, y_test), callbacks=cbks, nb_epoch=2)

        # fit with validation data and accuracy
        model.fit(X_train, y_train, batch_size=batch_size,
                  validation_data=(X_test, y_test), callbacks=cbks, nb_epoch=2)

        # fit generator with validation data
        model.fit_generator(data_generator(True), len(X_train), nb_epoch=2,
                            validation_data=(X_test, y_test),
                            callbacks=cbks)

        # fit generator without validation data
        model.fit_generator(data_generator(True), len(X_train), nb_epoch=2,
                            callbacks=cbks)

        # fit generator with validation data and accuracy
        model.fit_generator(data_generator(True), len(X_train), nb_epoch=2,
                            validation_data=(X_test, y_test),
                            callbacks=cbks)

        # fit generator without validation data and accuracy
        model.fit_generator(data_generator(True), len(X_train), nb_epoch=2,
                            callbacks=cbks)

        assert os.path.exists(filepath)
        shutil.rmtree(filepath)

    # case 2 Graph

    with tf.Graph().as_default():
        session = tf.Session('')
        KTF.set_session(session)
        model = Graph()
        model.add_input(name='X_vars', input_shape=(input_dim,))

        model.add_node(Dense(nb_hidden, activation="sigmoid"),
                       name='Dense1', input='X_vars')
        model.add_node(Dense(nb_class, activation="softmax"),
                       name='last_dense',
                       input='Dense1')
        model.add_output(name='output', input='last_dense')
        model.compile(optimizer='sgd', loss={'output': 'mse'})

        tsb = callbacks.TensorBoard(log_dir=filepath, histogram_freq=1)
        cbks = [tsb]

        # fit with validation
        model.fit({'X_vars': X_train, 'output': y_train},
#.........这里部分代码省略.........

# 需要导入模块: from keras.models import Sequential [as 别名]
# 或者: from keras.models.Sequential import add_output [as 别名]
def test_TensorBoard():
    import shutil
    import tensorflow as tf
    import keras.backend.tensorflow_backend as KTF
    old_session = KTF._get_session()
    filepath = './logs'
    (X_train, y_train), (X_test, y_test) = get_test_data(nb_train=train_samples,
                                                         nb_test=test_samples,
                                                         input_shape=(input_dim,),
                                                         classification=True,
                                                         nb_class=nb_class)
    y_test = np_utils.to_categorical(y_test)
    y_train = np_utils.to_categorical(y_train)
    # case 1 Sequential wo accuracy
    with tf.Graph().as_default():
        session = tf.Session('')
        KTF._set_session(session)
        model = Sequential()
        model.add(Dense(nb_hidden, input_dim=input_dim, activation='relu'))
        model.add(Dense(nb_class, activation='softmax'))
        model.compile(loss='categorical_crossentropy', optimizer='sgd')

        tsb = callbacks.TensorBoard(log_dir=filepath, histogram_freq=1)
        cbks = [tsb]
        model.fit(X_train, y_train, batch_size=batch_size, show_accuracy=True,
                  validation_data=(X_test, y_test), callbacks=cbks, nb_epoch=2)
        assert os.path.exists(filepath)
        shutil.rmtree(filepath)

    # case 2 Sequential w accuracy
    with tf.Graph().as_default():
        session = tf.Session('')
        KTF._set_session(session)
        model = Sequential()
        model.add(Dense(nb_hidden, input_dim=input_dim, activation='relu'))
        model.add(Dense(nb_class, activation='softmax'))
        model.compile(loss='categorical_crossentropy', optimizer='sgd')

        tsb = callbacks.TensorBoard(log_dir=filepath, histogram_freq=1)
        cbks = [tsb]
        model.fit(X_train, y_train, batch_size=batch_size, show_accuracy=True,
                  validation_data=(X_test, y_test), callbacks=cbks, nb_epoch=2)
        assert os.path.exists(filepath)
        shutil.rmtree(filepath)

    # case 3 Graph
    with tf.Graph().as_default():
        session = tf.Session('')
        KTF._set_session(session)
        model = Graph()
        model.add_input(name='X_vars', input_shape=(input_dim, ))

        model.add_node(Dense(nb_hidden, activation="sigmoid"),
                       name='Dense1', input='X_vars')
        model.add_node(Dense(nb_class, activation="softmax"),
                       name='last_dense',
                       input='Dense1')
        model.add_output(name='output', input='last_dense')
        model.compile(optimizer='sgd', loss={'output': 'mse'})

        tsb = callbacks.TensorBoard(log_dir=filepath, histogram_freq=1)
        cbks = [tsb]
        model.fit({'X_vars': X_train, 'output': y_train},
                  batch_size=batch_size,
                  validation_data={'X_vars': X_test, 'output': y_test},
                  callbacks=cbks, nb_epoch=2)
        assert os.path.exists(filepath)
        shutil.rmtree(filepath)

    KTF._set_session(old_session)

# 需要导入模块: from keras.models import Sequential [as 别名]
# 或者: from keras.models.Sequential import add_output [as 别名]
print ("Method = CNN from the paper 'Convolutional Neural Networks for Sentence Classification'")
np.random.seed(0)
nb_filter = embeddings_dim
model = Graph()
model.add_input(name='input', input_shape=(max_sent_len,), dtype=int)
model.add_node(Embedding(max_features, embeddings_dim, input_length=max_sent_len, mask_zero=False, weights=[embedding_weights] ), name='embedding', input='input')
model.add_node(Dropout(0.25), name='dropout_embedding', input='embedding')
for n_gram in [3, 5, 7]:
    model.add_node(Convolution1D(nb_filter=nb_filter, filter_length=n_gram, border_mode='valid', activation='relu', subsample_length=1, input_dim=embeddings_dim, input_length=max_sent_len), name='conv_' + str(n_gram), input='dropout_embedding')
    model.add_node(MaxPooling1D(pool_length=max_sent_len - n_gram + 1), name='maxpool_' + str(n_gram), input='conv_' + str(n_gram))
    model.add_node(Flatten(), name='flat_' + str(n_gram), input='maxpool_' + str(n_gram))
model.add_node(Dropout(0.25), name='dropout', inputs=['flat_' + str(n) for n in [3, 5, 7]])
model.add_node(Dense(1, input_dim=nb_filter * len([3, 5, 7])), name='dense', input='dropout')
model.add_node(Activation('sigmoid'), name='sigmoid', input='dense')
model.add_output(name='output', input='sigmoid')
if num_classes == 2: model.compile(loss={'output': 'binary_crossentropy'}, optimizer='adam')
else: model.compile(loss={'output': 'categorical_crossentropy'}, optimizer='adam') 
model.fit({'input': train_sequences, 'output': train_labels}, batch_size=32, nb_epoch=30)
results = np.array(model.predict({'input': test_sequences}, batch_size=32)['output'])
if num_classes != 2: results = results.argmax(axis=-1)
else: results = (results > 0.5).astype('int32')
print ("Accuracy = " + repr( sklearn.metrics.accuracy_score( test_labels , results )  ))
print (sklearn.metrics.classification_report( test_labels , results ))




print ("Method = Bidirectional LSTM")
np.random.seed(0)
model = Graph()