diff --git a/examples/callcenter/s1/.gitignore b/examples/callcenter/s1/.gitignore
new file mode 100644
index 00000000..02a22922
--- /dev/null
+++ b/examples/callcenter/s1/.gitignore
@@ -0,0 +1,3 @@
+data
+exp
+*.profile
diff --git a/examples/callcenter/s1/README.md b/examples/callcenter/s1/README.md
new file mode 100644
index 00000000..a83a516b
--- /dev/null
+++ b/examples/callcenter/s1/README.md
@@ -0,0 +1,20 @@
+# MandarinK8
+
+## Conformer
+
+| Model | Params | Config | Augmentation| Test set | Decode method | Loss | CER |  
+| --- | --- | --- | --- | --- | --- | --- | --- |  
+| conformer | 45.73 M | conf/conformer.yaml | spec_aug + shift | test | attention | 2.1794936656951904 | 0.102304 |  
+| conformer | 45.73 M | conf/conformer.yaml | spec_aug + shift | test | ctc_greedy_search | 2.1794936656951904 | 0.084295 |  
+| conformer | 45.73 M | conf/conformer.yaml | spec_aug + shift | test | ctc_prefix_beam_search | 2.1794936656951904 | 0.084340 |  
+| conformer | 45.73 M | conf/conformer.yaml | spec_aug + shift | test | attention_rescoring | 2.1794936656951904 | 0.081675 |  
+
+
+## Chunk Conformer
+
+| Model | Params | Config | Augmentation| Test set | Decode method | Chunk Size & Left Chunks | Loss | CER |  
+| --- | --- | --- | --- | --- | --- | --- | --- | --- |  
+| conformer | 45.73 M | conf/chunk_conformer.yaml | spec_aug + shift | test | attention | 16, -1 | 2.23287845  | 0.087982 |  
+| conformer | 45.73 M | conf/chunk_conformer.yaml | spec_aug + shift | test | ctc_greedy_search | 16, -1 | 2.23287845  | 0.086962 |  
+| conformer | 45.73 M | conf/chunk_conformer.yaml | spec_aug + shift | test | ctc_prefix_beam_search | 16, -1 | 2.23287845 | 0.086741 |  
+| conformer | 45.73 M | conf/chunk_conformer.yaml | spec_aug + shift | test | attention_rescoring | 16, -1 | 2.23287845 | 0.083495 | 
diff --git a/examples/callcenter/s1/conf/augmentation.json b/examples/callcenter/s1/conf/augmentation.json
new file mode 100644
index 00000000..1987ad42
--- /dev/null
+++ b/examples/callcenter/s1/conf/augmentation.json
@@ -0,0 +1,34 @@
+[
+  {
+    "type": "speed",
+    "params": {
+      "min_speed_rate": 0.9,
+      "max_speed_rate": 1.1,
+      "num_rates": 3
+    },
+    "prob": 0.0
+  },
+  {
+    "type": "shift",
+    "params": {
+      "min_shift_ms": -5,
+      "max_shift_ms": 5
+    },
+    "prob": 1.0
+  },
+  {
+    "type": "specaug",
+    "params": {
+      "F": 10,
+      "T": 50,
+      "n_freq_masks": 2,
+      "n_time_masks": 2,
+      "p": 1.0,
+      "W": 80,
+      "adaptive_number_ratio": 0,
+      "adaptive_size_ratio": 0,
+      "max_n_time_masks": 20
+    },
+    "prob": 1.0
+  }
+]
diff --git a/examples/callcenter/s1/conf/chunk_conformer.yaml b/examples/callcenter/s1/conf/chunk_conformer.yaml
new file mode 100644
index 00000000..f79b8eaa
--- /dev/null
+++ b/examples/callcenter/s1/conf/chunk_conformer.yaml
@@ -0,0 +1,120 @@
+# https://yaml.org/type/float.html
+data:
+  train_manifest: data/manifest.train
+  dev_manifest: data/manifest.dev
+  test_manifest: data/manifest.test
+  min_input_len: 0.5
+  max_input_len: 20.0 # second
+  min_output_len: 0.0
+  max_output_len: 400.0
+  min_output_input_ratio: 0.05
+  max_output_input_ratio: 10.0
+  
+
+collator:
+  vocab_filepath: data/vocab.txt 
+  unit_type: 'char'
+  spm_model_prefix: ''
+  augmentation_config: conf/augmentation.json
+  batch_size: 32
+  raw_wav: True  # use raw_wav or kaldi feature
+  specgram_type: fbank #linear, mfcc, fbank
+  feat_dim: 80
+  delta_delta: False
+  dither: 1.0
+  target_sample_rate: 8000
+  max_freq: None
+  n_fft: None
+  stride_ms: 10.0
+  window_ms: 25.0
+  use_dB_normalization: True 
+  target_dB: -20
+  random_seed: 0
+  keep_transcription_text: False
+  sortagrad: True 
+  shuffle_method: batch_shuffle
+  num_workers: 2
+
+
+# network architecture
+model:
+    cmvn_file: "data/mean_std.json"
+    cmvn_file_type: "json"
+    # encoder related
+    encoder: conformer
+    encoder_conf:
+        output_size: 256    # dimension of attention
+        attention_heads: 4
+        linear_units: 2048  # the number of units of position-wise feed forward
+        num_blocks: 12      # the number of encoder blocks
+        dropout_rate: 0.1
+        positional_dropout_rate: 0.1
+        attention_dropout_rate: 0.0
+        input_layer: conv2d # encoder input type, you can chose conv2d, conv2d6 and conv2d8
+        normalize_before: True
+        use_cnn_module: True
+        cnn_module_kernel: 15
+        activation_type: 'swish'
+        pos_enc_layer_type: 'rel_pos'
+        selfattention_layer_type: 'rel_selfattn'
+        causal: true
+        use_dynamic_chunk: true
+        cnn_module_norm: 'layer_norm' # using nn.LayerNorm makes model converge faster
+        use_dynamic_left_chunk: false
+
+    # decoder related
+    decoder: transformer
+    decoder_conf:
+        attention_heads: 4
+        linear_units: 2048
+        num_blocks: 6
+        dropout_rate: 0.1
+        positional_dropout_rate: 0.1
+        self_attention_dropout_rate: 0.0
+        src_attention_dropout_rate: 0.0
+
+    # hybrid CTC/attention
+    model_conf:
+        ctc_weight: 0.3
+        lsm_weight: 0.1     # label smoothing option
+        length_normalized_loss: false
+
+
+training:
+  n_epoch: 240
+  accum_grad: 4
+  global_grad_clip: 5.0
+  optim: adam
+  optim_conf:
+    lr: 0.001
+    weight_decay: 1e-6
+  scheduler: warmuplr     # pytorch v1.1.0+ required
+  scheduler_conf:
+    warmup_steps: 25000
+    lr_decay: 1.0
+  log_interval: 100
+  checkpoint:
+    kbest_n: 50
+    latest_n: 5
+
+
+decoding:
+  batch_size: 128
+  error_rate_type: cer 
+  decoding_method: attention # 'attention', 'ctc_greedy_search', 'ctc_prefix_beam_search', 'attention_rescoring'
+  lang_model_path: data/lm/common_crawl_00.prune01111.trie.klm
+  alpha: 2.5
+  beta: 0.3
+  beam_size: 10
+  cutoff_prob: 1.0
+  cutoff_top_n: 0
+  num_proc_bsearch: 8
+  ctc_weight: 0.5 # ctc weight for attention rescoring decode mode.
+  decoding_chunk_size: -1 # decoding chunk size. Defaults to -1.
+      # <0: for decoding, use full chunk.
+      # >0: for decoding, use fixed chunk size as set.
+      # 0: used for training, it's prohibited here. 
+  num_decoding_left_chunks: -1  # number of left chunks for decoding. Defaults to -1.
+  simulate_streaming: true  # simulate streaming inference. Defaults to False.
+
+
diff --git a/examples/callcenter/s1/conf/conformer.yaml b/examples/callcenter/s1/conf/conformer.yaml
new file mode 100644
index 00000000..3b08cc7a
--- /dev/null
+++ b/examples/callcenter/s1/conf/conformer.yaml
@@ -0,0 +1,117 @@
+# https://yaml.org/type/float.html
+data:
+  train_manifest: data/manifest.train
+  dev_manifest: data/manifest.dev
+  test_manifest: data/manifest.test
+  min_input_len: 0.5
+  max_input_len: 20.0 # second
+  min_output_len: 0.0
+  max_output_len: 400.0
+  min_output_input_ratio: 0.0
+  max_output_input_ratio: .inf 
+
+
+collator:
+  vocab_filepath: data/vocab.txt 
+  unit_type: 'char'
+  spm_model_prefix: ''
+  augmentation_config: conf/augmentation.json
+  batch_size: 32
+  raw_wav: True  # use raw_wav or kaldi feature
+  specgram_type: fbank #linear, mfcc, fbank
+  feat_dim: 80
+  delta_delta: False
+  dither: 1.0
+  target_sample_rate: 8000
+  max_freq: None
+  n_fft: None
+  stride_ms: 10.0
+  window_ms: 25.0
+  use_dB_normalization: True 
+  target_dB: -20
+  random_seed: 0
+  keep_transcription_text: False
+  sortagrad: True 
+  shuffle_method: batch_shuffle
+  num_workers: 2
+
+# network architecture
+model:
+    cmvn_file: "data/mean_std.json"
+    cmvn_file_type: "json"
+    # encoder related
+    encoder: conformer
+    encoder_conf:
+        output_size: 256    # dimension of attention
+        attention_heads: 4
+        linear_units: 2048  # the number of units of position-wise feed forward
+        num_blocks: 12      # the number of encoder blocks
+        dropout_rate: 0.1
+        positional_dropout_rate: 0.1
+        attention_dropout_rate: 0.0
+        input_layer: conv2d # encoder input type, you can chose conv2d, conv2d6 and conv2d8
+        normalize_before: True
+        use_cnn_module: True
+        cnn_module_kernel: 15
+        activation_type: 'swish'
+        pos_enc_layer_type: 'rel_pos'
+        selfattention_layer_type: 'rel_selfattn'
+
+    # decoder related
+    decoder: transformer
+    decoder_conf:
+        attention_heads: 4
+        linear_units: 2048
+        num_blocks: 6
+        dropout_rate: 0.1
+        positional_dropout_rate: 0.1
+        self_attention_dropout_rate: 0.0
+        src_attention_dropout_rate: 0.0
+
+    # hybrid CTC/attention
+    model_conf:
+        ctc_weight: 0.3
+        lsm_weight: 0.1     # label smoothing option
+        length_normalized_loss: false
+
+
+training:
+  n_epoch: 100 # 50 will be lowest 
+  accum_grad: 4
+  global_grad_clip: 5.0
+  optim: adam
+  optim_conf:
+    lr: 0.002
+    weight_decay: 1e-6
+  scheduler: warmuplr     # pytorch v1.1.0+ required
+  scheduler_conf:
+    warmup_steps: 25000
+    lr_decay: 1.0
+  log_interval: 100
+  checkpoint:
+    kbest_n: 50
+    latest_n: 5
+
+
+
+
+decoding:
+  batch_size: 128
+  error_rate_type: cer 
+  decoding_method: attention # 'attention', 'ctc_greedy_search', 'ctc_prefix_beam_search', 'attention_rescoring'
+  lang_model_path: data/lm/common_crawl_00.prune01111.trie.klm
+  alpha: 2.5
+  beta: 0.3
+  beam_size: 10
+  cutoff_prob: 1.0
+  cutoff_top_n: 0
+  num_proc_bsearch: 8
+  ctc_weight: 0.5 # ctc weight for attention rescoring decode mode.
+  decoding_chunk_size: -1 # decoding chunk size. Defaults to -1.
+      # <0: for decoding, use full chunk.
+      # >0: for decoding, use fixed chunk size as set.
+      # 0: used for training, it's prohibited here. 
+  num_decoding_left_chunks: -1  # number of left chunks for decoding. Defaults to -1.
+  simulate_streaming: False  # simulate streaming inference. Defaults to False.
+
+
diff --git a/examples/callcenter/s1/local/align.sh b/examples/callcenter/s1/local/align.sh
new file mode 100755
index 00000000..f2c878c2
--- /dev/null
+++ b/examples/callcenter/s1/local/align.sh
@@ -0,0 +1,43 @@
+#! /usr/bin/env bash
+
+if [ $# != 2 ];then
+    echo "usage: ${0} config_path ckpt_path_prefix"
+    exit -1
+fi
+
+ngpu=$(echo $CUDA_VISIBLE_DEVICES | awk -F "," '{print NF}')
+echo "using $ngpu gpus..."
+
+device=gpu
+if [ ${ngpu} == 0 ];then
+    device=cpu
+fi
+config_path=$1
+ckpt_prefix=$2
+
+ckpt_name=$(basename ${ckpt_prefxi})
+
+mkdir -p exp
+
+
+
+batch_size=1
+output_dir=${ckpt_prefix}
+mkdir -p ${output_dir}
+
+# align dump in `result_file`
+# .tier, .TextGrid dump in `dir of result_file`
+python3 -u ${BIN_DIR}/alignment.py \
+--device ${device} \
+--nproc 1 \
+--config ${config_path} \
+--result_file ${output_dir}/${type}.align \
+--checkpoint_path ${ckpt_prefix} \
+--opts decoding.batch_size ${batch_size}
+
+if [ $? -ne 0 ]; then
+    echo "Failed in ctc alignment!"
+    exit 1
+fi
+
+exit 0
diff --git a/examples/callcenter/s1/local/data.sh b/examples/callcenter/s1/local/data.sh
new file mode 100755
index 00000000..e2640ead
--- /dev/null
+++ b/examples/callcenter/s1/local/data.sh
@@ -0,0 +1,77 @@
+#! /usr/bin/env bash
+
+stage=-1
+stop_stage=100
+
+source ${MAIN_ROOT}/utils/parse_options.sh
+
+mkdir -p data
+
+if [ ${stage} -le -1 ] && [ ${stop_stage} -ge -1 ]; then
+    for dataset in train dev test; do
+        mv data/manifest.${dataset} data/manifest.${dataset}.raw
+    done
+fi
+
+if [ ${stage} -le 0 ] && [ ${stop_stage} -ge 0 ]; then
+    # download data, generate manifests
+    # build vocabulary
+    python3 ${MAIN_ROOT}/utils/build_vocab.py \
+    --unit_type="char" \
+    --count_threshold=0 \
+    --vocab_path="data/vocab.txt" \
+    --manifest_paths "data/manifest.train.raw"
+
+    if [ $? -ne 0 ]; then
+        echo "Build vocabulary failed. Terminated."
+        exit 1
+    fi
+fi
+
+
+if [ ${stage} -le 1 ] && [ ${stop_stage} -ge 1 ]; then
+    # compute mean and stddev for normalizer
+    num_workers=$(nproc)
+    python3 ${MAIN_ROOT}/utils/compute_mean_std.py \
+    --manifest_path="data/manifest.train.raw" \
+    --specgram_type="fbank" \
+    --feat_dim=80 \
+    --delta_delta=false \
+    --stride_ms=10.0 \
+    --window_ms=25.0 \
+    --sample_rate=8000 \
+    --use_dB_normalization=False \
+    --num_samples=-1 \
+    --num_workers=${num_workers} \
+    --output_path="data/mean_std.json"
+
+    if [ $? -ne 0 ]; then
+        echo "Compute mean and stddev failed. Terminated."
+        exit 1
+    fi
+fi
+
+
+if [ ${stage} -le 2 ] && [ ${stop_stage} -ge 2 ]; then
+    # format manifest with tokenids, vocab size
+    for dataset in train dev test; do
+    {
+        python3 ${MAIN_ROOT}/utils/format_data.py \
+            --feat_type "raw" \
+            --cmvn_path "data/mean_std.json" \
+            --unit_type "char" \
+            --vocab_path="data/vocab.txt" \
+            --manifest_path="data/manifest.${dataset}.raw" \
+            --output_path="data/manifest.${dataset}"
+
+        if [ $? -ne 0 ]; then
+            echo "Formt mnaifest failed. Terminated."
+            exit 1
+        fi
+    } &
+    done
+    wait
+fi
+
+echo "data preparation done."
+exit 0
diff --git a/examples/callcenter/s1/local/download_lm_ch.sh b/examples/callcenter/s1/local/download_lm_ch.sh
new file mode 100755
index 00000000..ac27a907
--- /dev/null
+++ b/examples/callcenter/s1/local/download_lm_ch.sh
@@ -0,0 +1,21 @@
+#!/bin/bash
+
+. ${MAIN_ROOT}/utils/utility.sh
+
+DIR=data/lm
+mkdir -p ${DIR}
+
+URL='https://deepspeech.bj.bcebos.com/zh_lm/zh_giga.no_cna_cmn.prune01244.klm'
+MD5="29e02312deb2e59b3c8686c7966d4fe3"
+TARGET=${DIR}/zh_giga.no_cna_cmn.prune01244.klm
+
+
+echo "Download language model ..."
+download $URL $MD5 $TARGET
+if [ $? -ne 0 ]; then
+    echo "Fail to download the language model!"
+    exit 1
+fi
+
+
+exit 0
diff --git a/examples/callcenter/s1/local/export.sh b/examples/callcenter/s1/local/export.sh
new file mode 100755
index 00000000..d171899c
--- /dev/null
+++ b/examples/callcenter/s1/local/export.sh
@@ -0,0 +1,34 @@
+#! /usr/bin/env bash
+
+if [ $# != 3 ];then
+    echo "usage: $0 config_path ckpt_prefix jit_model_path"
+    exit -1
+fi
+
+ngpu=$(echo $CUDA_VISIBLE_DEVICES | awk -F "," '{print NF}')
+echo "using $ngpu gpus..."
+
+config_path=$1
+ckpt_path_prefix=$2
+jit_model_export_path=$3
+
+device=gpu
+if [ ${ngpu} == 0 ];then
+    device=cpu
+fi
+
+python3 -u ${BIN_DIR}/export.py \
+--device ${device} \
+--nproc ${ngpu} \
+--config ${config_path} \
+--checkpoint_path ${ckpt_path_prefix} \
+--export_path ${jit_model_export_path}
+
+
+if [ $? -ne 0 ]; then
+    echo "Failed in export!"
+    exit 1
+fi
+
+
+exit 0
diff --git a/examples/callcenter/s1/local/test.sh b/examples/callcenter/s1/local/test.sh
new file mode 100755
index 00000000..7a5b1cdb
--- /dev/null
+++ b/examples/callcenter/s1/local/test.sh
@@ -0,0 +1,67 @@
+#! /usr/bin/env bash
+
+if [ $# != 2 ];then
+    echo "usage: ${0} config_path ckpt_path_prefix"
+    exit -1
+fi
+
+ngpu=$(echo $CUDA_VISIBLE_DEVICES | awk -F "," '{print NF}')
+echo "using $ngpu gpus..."
+
+device=gpu
+if [ ${ngpu} == 0 ];then
+    device=cpu
+fi
+config_path=$1
+ckpt_prefix=$2
+
+ckpt_name=$(basename ${ckpt_prefxi})
+
+mkdir -p exp
+
+# download language model
+#bash local/download_lm_ch.sh
+#if [ $? -ne 0 ]; then
+#    exit 1
+#fi
+
+
+for type in attention ctc_greedy_search; do
+    echo "decoding ${type}"
+    batch_size=1
+    output_dir=${ckpt_prefix}
+    mkdir -p ${output_dir}
+    python3 -u ${BIN_DIR}/test.py \
+    --device ${device} \
+    --nproc 1 \
+    --config ${config_path} \
+    --result_file ${output_dir}/${type}.rsl \
+    --checkpoint_path ${ckpt_prefix} \
+    --opts decoding.decoding_method ${type} decoding.batch_size ${batch_size}
+
+    if [ $? -ne 0 ]; then
+        echo "Failed in evaluation!"
+        exit 1
+    fi
+done
+
+for type in ctc_prefix_beam_search attention_rescoring; do
+    echo "decoding ${type}"
+    batch_size=1
+    output_dir=${ckpt_prefix}
+    mkdir -p ${output_dir}
+    python3 -u ${BIN_DIR}/test.py \
+    --device ${device} \
+    --nproc 1 \
+    --config ${config_path} \
+    --result_file ${output_dir}/${type}.rsl \
+    --checkpoint_path ${ckpt_prefix} \
+    --opts decoding.decoding_method ${type} decoding.batch_size ${batch_size}
+
+    if [ $? -ne 0 ]; then
+        echo "Failed in evaluation!"
+        exit 1
+    fi
+done
+
+exit 0
diff --git a/examples/callcenter/s1/local/train.sh b/examples/callcenter/s1/local/train.sh
new file mode 100755
index 00000000..f750568a
--- /dev/null
+++ b/examples/callcenter/s1/local/train.sh
@@ -0,0 +1,33 @@
+#! /usr/bin/env bash
+
+if [ $# != 2 ];then
+    echo "usage: CUDA_VISIBLE_DEVICES=0 ${0} config_path ckpt_name"
+    exit -1
+fi
+
+ngpu=$(echo $CUDA_VISIBLE_DEVICES | awk -F "," '{print NF}')
+echo "using $ngpu gpus..."
+
+config_path=$1
+ckpt_name=$2
+
+device=gpu
+if [ ${ngpu} == 0 ];then
+    device=cpu
+fi
+echo "using ${device}..."
+
+mkdir -p exp
+
+python3 -u ${BIN_DIR}/train.py \
+--device ${device} \
+--nproc ${ngpu} \
+--config ${config_path} \
+--output exp/${ckpt_name}
+
+if [ $? -ne 0 ]; then
+    echo "Failed in training!"
+    exit 1
+fi
+
+exit 0
diff --git a/examples/callcenter/s1/path.sh b/examples/callcenter/s1/path.sh
new file mode 100644
index 00000000..30adb6ca
--- /dev/null
+++ b/examples/callcenter/s1/path.sh
@@ -0,0 +1,14 @@
+export MAIN_ROOT=${PWD}/../../../
+
+export PATH=${MAIN_ROOT}:${MAIN_ROOT}/utils:${PATH}
+export LC_ALL=C
+
+# Use UTF-8 in Python to avoid UnicodeDecodeError when LC_ALL=C
+export PYTHONIOENCODING=UTF-8 
+export PYTHONPATH=${MAIN_ROOT}:${PYTHONPATH}
+
+export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:/usr/local/lib/
+
+
+MODEL=u2
+export BIN_DIR=${MAIN_ROOT}/deepspeech/exps/${MODEL}/bin
diff --git a/examples/callcenter/s1/run.sh b/examples/callcenter/s1/run.sh
new file mode 100644
index 00000000..52dd44ec
--- /dev/null
+++ b/examples/callcenter/s1/run.sh
@@ -0,0 +1,44 @@
+#!/bin/bash
+set -e
+source path.sh
+
+stage=0
+stop_stage=100
+conf_path=conf/conformer.yaml
+avg_num=20
+
+source ${MAIN_ROOT}/utils/parse_options.sh || exit 1;
+
+avg_ckpt=avg_${avg_num}
+ckpt=$(basename ${conf_path} | awk -F'.' '{print $1}')
+echo "checkpoint name ${ckpt}"
+
+if [ ${stage} -le 0 ] && [ ${stop_stage} -ge 0 ]; then
+    # prepare data
+    bash ./local/data.sh || exit -1
+fi
+
+if [ ${stage} -le 1 ] && [ ${stop_stage} -ge 1 ]; then
+    # train model, all `ckpt` under `exp` dir
+    CUDA_VISIBLE_DEVICES=0,1,2,3 ./local/train.sh ${conf_path}  ${ckpt}
+fi
+
+if [ ${stage} -le 2 ] && [ ${stop_stage} -ge 2 ]; then
+    # avg n best model
+    avg.sh exp/${ckpt}/checkpoints ${avg_num}
+fi
+
+if [ ${stage} -le 3 ] && [ ${stop_stage} -ge 3 ]; then
+    # test ckpt avg_n
+    CUDA_VISIBLE_DEVICES=4 ./local/test.sh ${conf_path} exp/${ckpt}/checkpoints/${avg_ckpt} || exit -1
+fi
+
+if [ ${stage} -le 4 ] && [ ${stop_stage} -ge 4 ]; then
+    # ctc alignment of test data
+    CUDA_VISIBLE_DEVICES=0 ./local/align.sh ${conf_path} exp/${ckpt}/checkpoints/${avg_ckpt} || exit -1
+fi
+
+if [ ${stage} -le 5 ] && [ ${stop_stage} -ge 5 ]; then
+    # export ckpt avg_n
+    CUDA_VISIBLE_DEVICES= ./local/export.sh ${conf_path} exp/${ckpt}/checkpoints/${avg_ckpt} exp/${ckpt}/checkpoints/${avg_ckpt}.jit
+fi
diff --git a/examples/librispeech/s1/README.md b/examples/librispeech/s1/README.md
index 17afa1c0..080b340e 100644
--- a/examples/librispeech/s1/README.md
+++ b/examples/librispeech/s1/README.md
@@ -17,9 +17,8 @@
 | --- | --- | --- | --- | --- | --- | --- | --- | --- |  
 | conformer | 47.63 M | conf/chunk_conformer.yaml | spec_aug + shift | test-clean | attention | 16, -1 | 7.01250648 | 0.069548 |  
 | conformer | 47.63 M | conf/chunk_conformer.yaml | spec_aug + shift | test-clean | ctc_greedy_search | 16, -1 | 7.01250648 | 0.094753 |  
-| conformer | 47.63 M | conf/chunk_conformer.yaml | spec_aug + shift | test-clean | ctc_prefix_beam_search | 16, -1 | 7.01250648 |  |  
-| conformer | 47.63 M | conf/chunk_conformer.yaml | spec_aug + shift | test-clean | attention_rescoring | 16, -1 | 7.01250648 |  |  
-
+| conformer | 47.63 M | conf/chunk_conformer.yaml | spec_aug + shift | test-clean | ctc_prefix_beam_search | 16, -1 | 7.01250648 | - |  
+| conformer | 47.63 M | conf/chunk_conformer.yaml | spec_aug + shift | test-clean | attention_rescoring | 16, -1 | 7.01250648 | - |  
 
 
 ## Transformer