머신러닝스터디/2016/2016 06 11

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내용

• keras 사용
• mnist
• keras mnist 예제파일 위치: https://s3.amazonaws.com/img-datasets/mnist.pkl.gz
  • 코드 실행하면 자동으로 받아짐

코드

from keras.models import Sequential
from keras.layers import Dense, Dropout, Activation
from keras.datasets import mnist
from keras.layers.core import Reshape
import numpy as np

(X_train, y_train), (X_test, y_test) = mnist.load_data()

model = Sequential()
model.add(Reshape((28*28,), input_shape=(28,28)))
model.add(Dense(60000, input_dim=28*28, activation='relu'))

model.add(Dropout(0.5))
model.add(Dense(64, activation='relu'))

model.add(Dropout(0.5))
model.add(Dense(10, activation='softmax'))

model.compile(loss='categorical_crossentropy',
              optimizer='adagrad',
              metrics=['accuracy'])

# y_train and y_test is simple integer of 0 to 9
# Need to be transformed to array
y_train_array = np.zeros((60000, 10))
y_test_array = np.zeros((10000, 10))
for i in range(60000):
  y_train_array[i][y_train[i]] = 1
for i in range(10000):
  y_test_array[i][y_test[i]] = 1

model.fit(X_train, y_train_array,
          nb_epoch=3,
          batch_size=16)

score = model.evaluate(X_test, y_test_array, batch_size=10000)

# TODO
print(score)

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