How can I enter data in keras? What is the structure? In particular, what are x_train and y_train if I have more than two columns?
This is the data I want to enter:

I am trying to define Xtrain in this example. It contains the multi-server code of Neural Network Perceptron. ( http://keras.io/examples/ ) Here is the code:
from keras.models import Sequential
from keras.layers.core import Dense, Dropout, Activation
from keras.optimizers import SGD
model = Sequential()
model.add(Dense(64, input_dim=20, init='uniform'))
model.add(Activation('tanh'))
model.add(Dropout(0.5))
model.add(Dense(64, init='uniform'))
model.add(Activation('tanh'))
model.add(Dropout(0.5))
model.add(Dense(2, init='uniform'))
model.add(Activation('softmax'))
sgd = SGD(lr=0.1, decay=1e-6, momentum=0.9, nesterov=True)
model.compile(loss='mean_squared_error', optimizer=sgd)
model.fit(X_train, y_train, nb_epoch=20, batch_size=16)
score = model.evaluate(X_test, y_test, batch_size=16)
EDIT (additional information):
Take a look here: What is the data type for the Python Keras deep learning package?
Keras numpy, theano.config.floatX. .theanorc. , float64 CPU float32 , float32 CPU, .
X = numpy.zeros((4,3), dtype=theano.config.floatX)
: 1 , numpy , excel. ?