diff --git a/_images/k2-gt-v1.9-blueviolet.svg b/_images/k2-gt-v1.9-blueviolet.svg
index 3019ff03d..534b2e534 100644
--- a/_images/k2-gt-v1.9-blueviolet.svg
+++ b/_images/k2-gt-v1.9-blueviolet.svg
@@ -1 +1 @@
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+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="80" height="20" role="img" aria-label="k2: &gt;= v1.9"><title>k2: &gt;= v1.9</title><linearGradient id="s" x2="0" y2="100%"><stop offset="0" stop-color="#bbb" stop-opacity=".1"/><stop offset="1" stop-opacity=".1"/></linearGradient><clipPath id="r"><rect width="80" height="20" rx="3" fill="#fff"/></clipPath><g clip-path="url(#r)"><rect width="23" height="20" fill="#555"/><rect x="23" width="57" height="20" fill="blueviolet"/><rect width="80" height="20" fill="url(#s)"/></g><g fill="#fff" text-anchor="middle" font-family="Verdana,Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="110"><text aria-hidden="true" x="125" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="130">k2</text><text x="125" y="140" transform="scale(.1)" fill="#fff" textLength="130">k2</text><text aria-hidden="true" x="505" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="470">&gt;= v1.9</text><text x="505" y="140" transform="scale(.1)" fill="#fff" textLength="470">&gt;= v1.9</text></g></svg>
\ No newline at end of file
diff --git a/_images/python-gt-v3.6-blue.svg b/_images/python-gt-v3.6-blue.svg
index df677ad09..4254dc58a 100644
--- a/_images/python-gt-v3.6-blue.svg
+++ b/_images/python-gt-v3.6-blue.svg
@@ -1 +1 @@
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+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="98" height="20" role="img" aria-label="python: &gt;= 3.6"><title>python: &gt;= 3.6</title><linearGradient id="s" x2="0" y2="100%"><stop offset="0" stop-color="#bbb" stop-opacity=".1"/><stop offset="1" stop-opacity=".1"/></linearGradient><clipPath id="r"><rect width="98" height="20" rx="3" fill="#fff"/></clipPath><g clip-path="url(#r)"><rect width="49" height="20" fill="#555"/><rect x="49" width="49" height="20" fill="#007ec6"/><rect width="98" height="20" fill="url(#s)"/></g><g fill="#fff" text-anchor="middle" font-family="Verdana,Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="110"><text aria-hidden="true" x="255" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="390">python</text><text x="255" y="140" transform="scale(.1)" fill="#fff" textLength="390">python</text><text aria-hidden="true" x="725" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="390">&gt;= 3.6</text><text x="725" y="140" transform="scale(.1)" fill="#fff" textLength="390">&gt;= 3.6</text></g></svg>
\ No newline at end of file
diff --git a/_images/torch-gt-v1.6.0-green.svg b/_images/torch-gt-v1.6.0-green.svg
index d7007d742..d3ece9a17 100644
--- a/_images/torch-gt-v1.6.0-green.svg
+++ b/_images/torch-gt-v1.6.0-green.svg
@@ -1 +1 @@
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="100" height="20" role="img" aria-label="torch: &gt;= 1.6.0"><title>torch: &gt;= 1.6.0</title><linearGradient id="s" x2="0" y2="100%"><stop offset="0" stop-color="#bbb" stop-opacity=".1"/><stop offset="1" stop-opacity=".1"/></linearGradient><clipPath id="r"><rect width="100" height="20" rx="3" fill="#fff"/></clipPath><g clip-path="url(#r)"><rect width="39" height="20" fill="#555"/><rect x="39" width="61" height="20" fill="#97ca00"/><rect width="100" height="20" fill="url(#s)"/></g><g fill="#fff" text-anchor="middle" font-family="Verdana,Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="110"><text aria-hidden="true" x="205" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="290">torch</text><text x="205" y="140" transform="scale(.1)" fill="#fff" textLength="290">torch</text><text aria-hidden="true" x="685" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="510">&gt;= 1.6.0</text><text x="685" y="140" transform="scale(.1)" fill="#fff" textLength="510">&gt;= 1.6.0</text></g></svg>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="100" height="20" role="img" aria-label="torch: &gt;= 1.6.0"><title>torch: &gt;= 1.6.0</title><linearGradient id="s" x2="0" y2="100%"><stop offset="0" stop-color="#bbb" stop-opacity=".1"/><stop offset="1" stop-opacity=".1"/></linearGradient><clipPath id="r"><rect width="100" height="20" rx="3" fill="#fff"/></clipPath><g clip-path="url(#r)"><rect width="39" height="20" fill="#555"/><rect x="39" width="61" height="20" fill="#97ca00"/><rect width="100" height="20" fill="url(#s)"/></g><g fill="#fff" text-anchor="middle" font-family="Verdana,Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="110"><text aria-hidden="true" x="205" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="290">torch</text><text x="205" y="140" transform="scale(.1)" fill="#fff" textLength="290">torch</text><text aria-hidden="true" x="685" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="510">&gt;= 1.6.0</text><text x="685" y="140" transform="scale(.1)" fill="#fff" textLength="510">&gt;= 1.6.0</text></g></svg>
\ No newline at end of file
diff --git a/_sources/recipes/aishell/index.rst.txt b/_sources/recipes/aishell/index.rst.txt
index b77d59bca..d072d6e9c 100644
--- a/_sources/recipes/aishell/index.rst.txt
+++ b/_sources/recipes/aishell/index.rst.txt
@@ -19,3 +19,4 @@ It can be downloaded from `<https://www.openslr.org/33/>`_
    tdnn_lstm_ctc
    conformer_ctc
    stateless_transducer
+
diff --git a/_sources/recipes/timit/index.rst.txt b/_sources/recipes/timit/index.rst.txt
index 5ee147be7..17f40cdb7 100644
--- a/_sources/recipes/timit/index.rst.txt
+++ b/_sources/recipes/timit/index.rst.txt
@@ -6,3 +6,4 @@ TIMIT
 
    tdnn_ligru_ctc
    tdnn_lstm_ctc
+
diff --git a/_sources/recipes/timit/tdnn_ligru_ctc.rst.txt b/_sources/recipes/timit/tdnn_ligru_ctc.rst.txt
index 3d7aefe02..186420ee7 100644
--- a/_sources/recipes/timit/tdnn_ligru_ctc.rst.txt
+++ b/_sources/recipes/timit/tdnn_ligru_ctc.rst.txt
@@ -148,10 +148,10 @@ Some commonly used options are:
 
         $ ./tdnn_ligru_ctc/decode.py --epoch 25 --avg 17
 
-    uses the average of ``epoch-9.pt``, ``epoch-10.pt``, ``epoch-11.pt``,
-    ``epoch-12.pt``, ``epoch-13.pt``, ``epoch-14.pt``, ``epoch-15.pt``,
-    ``epoch-16.pt``, ``epoch-17.pt``, ``epoch-18.pt``, ``epoch-19.pt``,
-    ``epoch-20.pt``, ``epoch-21.pt``, ``epoch-22.pt``, ``epoch-23.pt``,
+    uses the average of ``epoch-9.pt``, ``epoch-10.pt``, ``epoch-11.pt``, 
+    ``epoch-12.pt``, ``epoch-13.pt``, ``epoch-14.pt``, ``epoch-15.pt``, 
+    ``epoch-16.pt``, ``epoch-17.pt``, ``epoch-18.pt``, ``epoch-19.pt``, 
+    ``epoch-20.pt``, ``epoch-21.pt``, ``epoch-22.pt``, ``epoch-23.pt``, 
     ``epoch-24.pt`` and ``epoch-25.pt``
     for decoding.
 
@@ -317,13 +317,13 @@ To decode with ``1best`` method, we can use:
 
 .. code-block:: bash
 
-  ./tdnn_ligru_ctc/pretrained.py
+  ./tdnn_ligru_ctc/pretrained.py 
     --method 1best
-    --checkpoint ./tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/exp/pretrained_average_9_25.pt
-    --words-file ./tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/data/lang_phone/words.txt
-    --HLG ./tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/data/lang_phone/HLG.pt
-    ./tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/test_waves/FDHC0_SI1559.WAV
-    ./tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/test_waves/FELC0_SI756.WAV
+    --checkpoint ./tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/exp/pretrained_average_9_25.pt 
+    --words-file ./tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/data/lang_phone/words.txt 
+    --HLG ./tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/data/lang_phone/HLG.pt 
+    ./tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/test_waves/FDHC0_SI1559.WAV 
+    ./tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/test_waves/FELC0_SI756.WAV 
     ./tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/test_waves/FMGD0_SI1564.WAV
 
 The output is:
@@ -337,7 +337,7 @@ The output is:
   2021-11-08 20:41:38,697 INFO [pretrained.py:210] Reading sound files: ['./tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/test_waves/FDHC0_SI1559.WAV', './tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/test_waves/FELC0_SI756.WAV', './tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/test_waves/FMGD0_SI1564.WAV']
   2021-11-08 20:41:38,704 INFO [pretrained.py:216] Decoding started
   2021-11-08 20:41:39,819 INFO [pretrained.py:246] Use HLG decoding
-  2021-11-08 20:41:39,829 INFO [pretrained.py:267]
+  2021-11-08 20:41:39,829 INFO [pretrained.py:267] 
   ./tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/test_waves/FDHC0_SI1559.WAV:
   sil dh ih sh uw ah l iy v iy z ih sil p r aa sil k s ih m ey dx ih sil d w uh dx ih w ih s f iy l ih ng w ih th ih n ih m s eh l f sil jh
 
@@ -362,8 +362,8 @@ To decode with ``whole-lattice-rescoring`` methond, you can use
     --HLG ./tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/data/lang_phone/HLG.pt \
     --G ./tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/data/lm/G_4_gram.pt \
     --ngram-lm-scale 0.1 \
-    ./tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/test_waves/FDHC0_SI1559.WAV
-    ./tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/test_waves/FELC0_SI756.WAV
+    ./tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/test_waves/FDHC0_SI1559.WAV 
+    ./tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/test_waves/FELC0_SI756.WAV 
     ./tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/test_waves/FMGD0_SI1564.WAV
 
 The decoding output is:
@@ -378,7 +378,7 @@ The decoding output is:
   2021-11-08 20:37:54,715 INFO [pretrained.py:210] Reading sound files: ['./tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/test_waves/FDHC0_SI1559.WAV', './tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/test_waves/FELC0_SI756.WAV', './tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/test_waves/FMGD0_SI1564.WAV']
   2021-11-08 20:37:54,720 INFO [pretrained.py:216] Decoding started
   2021-11-08 20:37:55,808 INFO [pretrained.py:251] Use HLG decoding + LM rescoring
-  2021-11-08 20:37:56,348 INFO [pretrained.py:267]
+  2021-11-08 20:37:56,348 INFO [pretrained.py:267] 
   ./tmp-ligru/icefall_asr_timit_tdnn_ligru_ctc/test_waves/FDHC0_SI1559.WAV:
   sil dh ih sh uw ah l iy v iy z ah sil p r aa sil k s ih m ey dx ih sil d w uh dx iy w ih s f iy l iy ng w ih th ih n ih m s eh l f sil jh
 
diff --git a/_sources/recipes/timit/tdnn_lstm_ctc.rst.txt b/_sources/recipes/timit/tdnn_lstm_ctc.rst.txt
index ee67a6edc..6f760a9ce 100644
--- a/_sources/recipes/timit/tdnn_lstm_ctc.rst.txt
+++ b/_sources/recipes/timit/tdnn_lstm_ctc.rst.txt
@@ -148,8 +148,8 @@ Some commonly used options are:
 
         $ ./tdnn_lstm_ctc/decode.py --epoch 25 --avg 10
 
-    uses the average of ``epoch-16.pt``, ``epoch-17.pt``, ``epoch-18.pt``,
-    ``epoch-19.pt``, ``epoch-20.pt``, ``epoch-21.pt``, ``epoch-22.pt``,
+    uses the average of ``epoch-16.pt``, ``epoch-17.pt``, ``epoch-18.pt``, 
+    ``epoch-19.pt``, ``epoch-20.pt``, ``epoch-21.pt``, ``epoch-22.pt``, 
     ``epoch-23.pt``, ``epoch-24.pt`` and ``epoch-25.pt``
     for decoding.
 
@@ -315,13 +315,13 @@ To decode with ``1best`` method, we can use:
 
 .. code-block:: bash
 
-  ./tdnn_lstm_ctc/pretrained.py
+  ./tdnn_lstm_ctc/pretrained.py 
     --method 1best
-    --checkpoint ./tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/exp/pretrained_average_16_25.pt
-    --words-file ./tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/data/lang_phone/words.txt
-    --HLG ./tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/data/lang_phone/HLG.pt
-    ./tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/test_waves/FDHC0_SI1559.WAV
-    ./tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/test_waves/FELC0_SI756.WAV
+    --checkpoint ./tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/exp/pretrained_average_16_25.pt 
+    --words-file ./tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/data/lang_phone/words.txt 
+    --HLG ./tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/data/lang_phone/HLG.pt 
+    ./tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/test_waves/FDHC0_SI1559.WAV 
+    ./tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/test_waves/FELC0_SI756.WAV 
     ./tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/test_waves/FMGD0_SI1564.WAV
 
 The output is:
@@ -335,7 +335,7 @@ The output is:
   2021-11-08 21:02:53,827 INFO [pretrained.py:210] Reading sound files: ['./tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/test_waves/FDHC0_SI1559.WAV', './tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/test_waves/FELC0_SI756.WAV', './tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/test_waves/FMGD0_SI1564.WAV']
   2021-11-08 21:02:53,831 INFO [pretrained.py:216] Decoding started
   2021-11-08 21:02:54,380 INFO [pretrained.py:246] Use HLG decoding
-  2021-11-08 21:02:54,387 INFO [pretrained.py:267]
+  2021-11-08 21:02:54,387 INFO [pretrained.py:267] 
   ./tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/test_waves/FDHC0_SI1559.WAV:
   sil dh ih sh uw ah l iy v iy z ih sil p r aa sil k s ih m ey dx ih sil d w uh dx iy w ih s f iy l iy w ih th ih n ih m s eh l f sil jh
 
@@ -360,8 +360,8 @@ To decode with ``whole-lattice-rescoring`` methond, you can use
     --HLG ./tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/data/lang_phone/HLG.pt \
     --G ./tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/data/lm/G_4_gram.pt \
     --ngram-lm-scale 0.08 \
-    ./tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/test_waves/FDHC0_SI1559.WAV
-    ./tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/test_waves/FELC0_SI756.WAV
+    ./tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/test_waves/FDHC0_SI1559.WAV 
+    ./tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/test_waves/FELC0_SI756.WAV 
     ./tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/test_waves/FMGD0_SI1564.WAV
 
 The decoding output is:
@@ -376,7 +376,7 @@ The decoding output is:
   2021-11-08 20:05:26,978 INFO [pretrained.py:210] Reading sound files: ['./tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/test_waves/FDHC0_SI1559.WAV', './tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/test_waves/FELC0_SI756.WAV', './tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/test_waves/FMGD0_SI1564.WAV']
   2021-11-08 20:05:26,981 INFO [pretrained.py:216] Decoding started
   2021-11-08 20:05:27,519 INFO [pretrained.py:251] Use HLG decoding + LM rescoring
-  2021-11-08 20:05:27,878 INFO [pretrained.py:267]
+  2021-11-08 20:05:27,878 INFO [pretrained.py:267] 
   ./tmp-lstm/icefall_asr_timit_tdnn_lstm_ctc/test_waves/FDHC0_SI1559.WAV:
   sil dh ih sh uw l iy v iy z ih sil p r aa sil k s ah m ey dx ih sil w uh dx iy w ih s f iy l ih ng w ih th ih n ih m s eh l f sil jh
 
diff --git a/_static/k2-gt-v1.9-blueviolet.svg b/_static/k2-gt-v1.9-blueviolet.svg
index 3019ff03d..534b2e534 100644
--- a/_static/k2-gt-v1.9-blueviolet.svg
+++ b/_static/k2-gt-v1.9-blueviolet.svg
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index d7007d742..d3ece9a17 100644
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