import tensorflow as tf

        epsilon=hparams.vq_epsilon,
        ema=hparams.ema,
        means=means)

    inputs = None
    batch_size = hparams.batch_size
    targets = tf.random_uniform([batch_size,
                                 hparams.img_len,
                                 hparams.img_len,
                                 hparams.hidden_size],
                                minval=-1., maxval=1.)
    target_space_id = None
