Tensorflowでのcsv読み込みについて

下記のコードを用いてTensorflowで画像から変換したcsvのファイルを読み込みたいです。
Colaboratoryで実行しています。

import sys
import tensorflow as tf

def read_csv(csvfile):
    fname_queue = tf.train.string_input_producer(["/content/drive/magefiles.csv"])
    reader = tf.TextLineReader()
    key, val = reader.read(fname_queue)
    fname, label = tf.decode_csv(val, [["aa"], [1]])
    return read_img(fname)

def read_img(fname):
    img_r = tf.read_file(fname)
    return tf.image.decode_image(img_r, channels=3)

def main():
    argv = sys.argv
    argc = len(argv)
    if (argc < 2):
        print('Usage: python %s csvfile' %argv[0])
        quit()

    image = read_csv(argv[1])

    sess = tf.Session()
    init = tf.initialize_all_variables()
    sess.run(init)
    tf.train.start_queue_runners(sess)
    x = sess.run(image)

    print(x)

if __name__ == '__main__':
    main()

このコードを実行するとこのようなエラーが出ます。

---------------------------------------------------------------------------
InvalidArgumentError                      Traceback (most recent call last)
/usr/local/lib/python3.6/dist-packages/tensorflow_core/python/client/session.py in _do_call(self, fn, *args)
   1364     try:
-> 1365       return fn(*args)
   1366     except errors.OpError as e:

7 frames
InvalidArgumentError: 2 root error(s) found.
  (0) Invalid argument: Quoted field has to end with quote followed by delim or end
	 [[{{node DecodeCSV_6}}]]
  (1) Invalid argument: Quoted field has to end with quote followed by delim or end
	 [[{{node DecodeCSV_6}}]]
	 [[decode_image_5/cond_jpeg/DecodeJpeg/_113]]
0 successful operations.
0 derived errors ignored.

During handling of the above exception, another exception occurred:

InvalidArgumentError                      Traceback (most recent call last)
/usr/local/lib/python3.6/dist-packages/tensorflow_core/python/client/session.py in _do_call(self, fn, *args)
   1382                     '\nsession_config.graph_options.rewrite_options.'
   1383                     'disable_meta_optimizer = True')
-> 1384       raise type(e)(node_def, op, message)
   1385 
   1386   def _extend_graph(self):

InvalidArgumentError: 2 root error(s) found.
  (0) Invalid argument: Quoted field has to end with quote followed by delim or end
	 [[node DecodeCSV_6 (defined at /usr/local/lib/python3.6/dist-packages/tensorflow_core/python/framework/ops.py:1748) ]]
  (1) Invalid argument: Quoted field has to end with quote followed by delim or end
	 [[node DecodeCSV_6 (defined at /usr/local/lib/python3.6/dist-packages/tensorflow_core/python/framework/ops.py:1748) ]]
	 [[decode_image_5/cond_jpeg/DecodeJpeg/_113]]
0 successful operations.
0 derived errors ignored.

引数が無効で，引用符の後にdelimかendを付けなければならないという事はわかるのですが，これに該当する部分がどこなのかわかりません。

もし解決方法を知っている方がいらっしゃればご教示願います。
また，csvからではなくてもTensorflowで画像ファイルを読み込む方法でも構いません。よろしくお願いいたします。