Loading data in tensorflow

loading_data_file.py

/*
$ cat test.csv
1,2,3,,5,6,7,8,9
0,9,8,7,6,5,4,3,2
2,3,4,5,6,7,8,9,0
5,4,3,2,16,7,8,9,3
*/

import tensorflow as tf

filename_queue = tf.train.string_input_producer(['./test.csv'])
reader = tf.TextLineReader()

key, value = reader.read(filename_queue)
record_defaults = [[1], [1], [1], [1], [1], [1], [1], [1], [1]]
col1, col2, col3, col4, col5, col6, col7, col8, col9 = tf.decode_csv(value, record_defaults=record_defaults)
features = tf.stack([col1, col2, col3, col4, col5, col6, col7, col8, col9])

with tf.Session() as sess:
    coord = tf.train.Coordinator()
    threads = tf.train.start_queue_runners(coord=coord)
    for i in range(5):
        example, label = sess.run([features, col9])
        print('example:', example, 'label:', label)
    coord.request_stop()
    coord.join(threads)