From 1444dbcb0fb6f437a2bfb98def252da925580ce8 Mon Sep 17 00:00:00 2001
From: lispczz <lispc@qq.com>
Date: Thu, 21 Sep 2017 16:02:43 +0800
Subject: [PATCH] fix a deep speech 2 speed bug

---
 deep_speech_2/data_utils/data.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/deep_speech_2/data_utils/data.py b/deep_speech_2/data_utils/data.py
index 8bff6826..7ddf1f33 100644
--- a/deep_speech_2/data_utils/data.py
+++ b/deep_speech_2/data_utils/data.py
@@ -327,7 +327,7 @@ class DataGenerator(object):
         shift_len = self._rng.randint(0, batch_size - 1)
         batch_manifest = zip(*[iter(manifest[shift_len:])] * batch_size)
         self._rng.shuffle(batch_manifest)
-        batch_manifest = list(sum(batch_manifest, ()))
+        batch_manifest = [item for batch in batch_manifest for item in batch]
         if not clipped:
             res_len = len(manifest) - shift_len - len(batch_manifest)
             batch_manifest.extend(manifest[-res_len:])
-- 
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