Created
January 23, 2017 10:17
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import random | |
from sklearn import datasets, cross_validation, metrics | |
import tensorflow as tf | |
from tensorflow.contrib import layers | |
from tensorflow.contrib import learn | |
import numpy as np | |
random.seed(42) | |
# Load dataset and split it into train / test subsets. | |
digits = datasets.load_digits() | |
X = digits.images.astype(np.float32) | |
y = digits.target | |
X_train, X_test, y_train, y_test = cross_validation.train_test_split(X, y, | |
test_size=0.2, random_state=42) | |
# TensorFlow model using Scikit Flow ops | |
def conv_model(features, target): | |
target = tf.one_hot(target, 10, 1.0, 0.0) | |
features = tf.expand_dims(features, 3) | |
features = tf.reduce_max(layers.conv2d(features, 12, [3, 3]), [1, 2]) | |
features = tf.reshape(features, [-1, 12]) | |
prediction, loss = learn.models.logistic_regression(features, target) | |
train_op = layers.optimize_loss(loss, | |
tf.contrib.framework.get_global_step(), optimizer='SGD', | |
learning_rate=0.01) | |
return tf.argmax(prediction, dimension=1), loss, train_op | |
# Create a classifier, train and predict. | |
classifier = learn.Estimator(model_fn=conv_model) | |
classifier.fit(X_train, y_train, steps=1000, batch_size=128) | |
y_predicted = list(classifier.predict(X_test)) | |
score = metrics.accuracy_score(y_predicted, y_test) | |
print('Accuracy: %f' % score) | |
print(list(classifier.predict(X_test[0:1])), y_test[0]) |
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