<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def sum_abs_distance(labels, preds):
 """ Compute the sum of abs distances. """

    with tf.variable_scope("sum_abs_distance"):
        return tf.reduce_sum(tf.abs(preds - labels), axis=-1)