I think there is a bug in function: calculate_actual_outputs

[sohumango]

add the following line. actual_deltas = tf.where(tf.expand_dims(pos_cond, -1), actual_deltas, tf.zeros_like(actual_deltas)). for prior_boxes are not all zeros. the clear zero action before bbox_utils.get_deltas_from_bboxes_and_landmarks was wasted.