diff --git a/DeepSpeech.py b/DeepSpeech.py
index daa80a8c..f3162140 100755
--- a/DeepSpeech.py
+++ b/DeepSpeech.py
@@ -595,23 +595,13 @@ def train():
             # Batch loop
             while True:
                 try:
-                    try:
-                        _, current_step, batch_loss, problem_files, step_summary = \
-                            session.run([train_op, global_step, loss, non_finite_files, step_summaries_op],
-                                        feed_dict=feed_dict)
-                    except errors_impl.InvalidArgumentError as err:
-                        if FLAGS.augmentation_sparse_warp:
-                            # recover twice for sparse warp, if still error, abort it!!!
-                            try:
-                                print('recovering the invertible error: {}'.format(err))
-                                _, current_step, batch_loss, problem_files, step_summary = \
-                                    session.run([train_op, global_step, loss, non_finite_files, step_summaries_op],
-                                                feed_dict=feed_dict)
-                            except errors_impl.InvalidArgumentError as err:
-                                print('recovering the invertible error `AGAIN`: {}'.format(err))
-                                _, current_step, batch_loss, problem_files, step_summary = \
-                                    session.run([train_op, global_step, loss, non_finite_files, step_summaries_op],
-                                                feed_dict=feed_dict)
+                    _, current_step, batch_loss, problem_files, step_summary = \
+                        session.run([train_op, global_step, loss, non_finite_files, step_summaries_op],
+                                    feed_dict=feed_dict)
+                except tf.errors.InvalidArgumentError as err:
+                    if FLAGS.augmentation_sparse_warp:
+                        log_info("skip sparse warp error: {}".format(err))
+                        continue
                 except tf.errors.OutOfRangeError:
                     break
 
diff --git a/util/flags.py b/util/flags.py
index d2a45766..624217e0 100644
--- a/util/flags.py
+++ b/util/flags.py
@@ -29,7 +29,7 @@ def create_flags():
 
     f.DEFINE_float('augmentation_spec_dropout_keeprate', 1, 'keep rate of dropout augmentation on spectrogram (if 1, no dropout will be performed on spectrogram)')
 
-    f.DEFINE_boolean('augmentation_sparse_warp', False, 'whether to use spectrogram sparse warp')
+    f.DEFINE_boolean('augmentation_sparse_warp', False, 'whether to use spectrogram sparse warp. USE OF THIS FLAG IS UNSUPPORTED, enable sparse warp will increase training time drastically, and the paper also mentioned that this is not a major factor to improve accuracy.')
     f.DEFINE_integer('augmentation_sparse_warp_num_control_points', 1, 'specify number of control points')
     f.DEFINE_integer('augmentation_sparse_warp_time_warping_para', 20, 'time_warping_para')
     f.DEFINE_integer('augmentation_sparse_warp_interpolation_order', 2, 'sparse_warp_interpolation_order')
diff --git a/util/spectrogram_augmentations.py b/util/spectrogram_augmentations.py
index 8ba903be..58980e8c 100644
--- a/util/spectrogram_augmentations.py
+++ b/util/spectrogram_augmentations.py
@@ -117,11 +117,6 @@ def augment_sparse_warp(spectrogram, time_warping_para=20, interpolation_order=2
     source_control_point_locations = tf.cast([sources], tf.float32)
     dest_control_point_locations = tf.cast([dests], tf.float32)
 
-    # debug
-    # spectrogram = tf.Print(spectrogram, [tf.shape(spectrogram)], message='spectrogram', first_n=1000)
-    # spectrogram = tf.Print(spectrogram, sources, message='sources', first_n=1000)
-    # spectrogram = tf.Print(spectrogram, dests, message='dests', first_n=1000)
-
     warped_spectrogram, _ = sparse_image_warp(spectrogram,
                                               source_control_point_locations=source_control_point_locations,
                                               dest_control_point_locations=dest_control_point_locations,