model.add(Activation('tanh'))
model.add(Dropout(0.5))
model.add(Dense(64, init='uniform'))
model.add(Activation('softmax'))
sgd3 = SGD(lr=0.1, decay=1e-06, momentum=0.9, nesterov=True)
model.compile(loss='binary_crossentropy', optimizer=sgd3)
model.fit(X_train, y_train, nb_epoch=20, batch_size=16, show_accuracy=True,
    validation_split=0.2, verbose=2)
How do you change the number of units in a layer when using Keras?