diff --git a/examples/librispeech/s2/conf/decode/decode.yaml b/examples/librispeech/s2/conf/decode/decode.yaml
index 4c702db56..98b36d175 100644
--- a/examples/librispeech/s2/conf/decode/decode.yaml
+++ b/examples/librispeech/s2/conf/decode/decode.yaml
@@ -1,7 +1,7 @@
 batchsize: 0
 beam-size: 60
-ctc-weight: 0.0
-lm-weight: 0.0
+ctc-weight: 0.4
+lm-weight: 0.6
 maxlenratio: 0.0
 minlenratio: 0.0
 penalty: 0.0
diff --git a/examples/librispeech/s2/conf/decode/decode_att.yaml b/examples/librispeech/s2/conf/decode/decode_att.yaml
new file mode 100644
index 000000000..4c702db56
--- /dev/null
+++ b/examples/librispeech/s2/conf/decode/decode_att.yaml
@@ -0,0 +1,7 @@
+batchsize: 0
+beam-size: 60
+ctc-weight: 0.0
+lm-weight: 0.0
+maxlenratio: 0.0
+minlenratio: 0.0
+penalty: 0.0
diff --git a/examples/librispeech/s2/conf/decode/decode_all.yaml b/examples/librispeech/s2/conf/decode/decode_ctc.yaml
similarity index 73%
rename from examples/librispeech/s2/conf/decode/decode_all.yaml
rename to examples/librispeech/s2/conf/decode/decode_ctc.yaml
index 87d5f6d19..867bf6118 100644
--- a/examples/librispeech/s2/conf/decode/decode_all.yaml
+++ b/examples/librispeech/s2/conf/decode/decode_ctc.yaml
@@ -1,7 +1,7 @@
 batchsize: 0
 beam-size: 60
 ctc-weight: 0.4
-lm-weight: 0.6
+lm-weight: 0.0
 maxlenratio: 0.0
 minlenratio: 0.0
-penalty: 0.0
\ No newline at end of file
+penalty: 0.0
diff --git a/requirements.txt b/requirements.txt
index 1ead86091..08f68449e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,8 @@ librosa
 llvmlite
 loguru
 matplotlib
-nara_wpenltk
+nara_wpe
+nltk
 numba
 numpy==1.20.0
 pandas