diff --git a/egs/librispeech/ASR/local/compute_fbank_librispeech.py b/egs/librispeech/ASR/local/compute_fbank_librispeech.py
index 554d7f109..25d6050bb 100755
--- a/egs/librispeech/ASR/local/compute_fbank_librispeech.py
+++ b/egs/librispeech/ASR/local/compute_fbank_librispeech.py
@@ -35,7 +35,7 @@ from filter_cuts import filter_cuts
 from lhotse import CutSet, Fbank, FbankConfig, LilcomChunkyWriter
 from lhotse.recipes.utils import read_manifests_if_cached
 
-from icefall.utils import get_executor
+from icefall.utils import get_executor, str2bool
 
 # Torch's multithreaded behavior needs to be disabled or
 # it wastes a lot of CPU and slow things down.
@@ -61,12 +61,20 @@ def get_args():
         help="""Dataset parts to compute fbank. If None, we will use all""",
     )
 
+    parser.add_argument(
+        "--perturb-speed",
+        type=str2bool,
+        default=True,
+        help="""Perturb speed with factor 0.9 and 1.1 on train subset.""",
+    )
+
     return parser.parse_args()
 
 
 def compute_fbank_librispeech(
     bpe_model: Optional[str] = None,
     dataset: Optional[str] = None,
+    perturb_speed: Optional[bool] = True,
 ):
     src_dir = Path("data/manifests")
     output_dir = Path("data/fbank")
@@ -125,9 +133,13 @@ def compute_fbank_librispeech(
             if "train" in partition:
                 if bpe_model:
                     cut_set = filter_cuts(cut_set, sp)
-                cut_set = (
-                    cut_set + cut_set.perturb_speed(0.9) + cut_set.perturb_speed(1.1)
-                )
+                if perturb_speed:
+                    logging.info(f"Doing speed perturb")
+                    cut_set = (
+                        cut_set
+                        + cut_set.perturb_speed(0.9)
+                        + cut_set.perturb_speed(1.1)
+                    )
             cut_set = cut_set.compute_and_store_features(
                 extractor=extractor,
                 storage_path=f"{output_dir}/{prefix}_feats_{partition}",
@@ -145,4 +157,8 @@ if __name__ == "__main__":
     logging.basicConfig(format=formatter, level=logging.INFO)
     args = get_args()
     logging.info(vars(args))
-    compute_fbank_librispeech(bpe_model=args.bpe_model, dataset=args.dataset)
+    compute_fbank_librispeech(
+        bpe_model=args.bpe_model,
+        dataset=args.dataset,
+        perturb_speed=args.perturb_speed,
+    )
diff --git a/egs/librispeech/ASR/prepare_common_voice.sh b/egs/librispeech/ASR/prepare_common_voice.sh
new file mode 100755
index 000000000..6f9c4fb2f
--- /dev/null
+++ b/egs/librispeech/ASR/prepare_common_voice.sh
@@ -0,0 +1,117 @@
+#!/usr/bin/env bash
+
+set -eou pipefail
+
+nj=16
+stage=-1
+stop_stage=100
+
+# Split data/${lang}set to this number of pieces
+# This is to avoid OOM during feature extraction.
+num_splits=1000
+
+# We assume dl_dir (download dir) contains the following
+# directories and files. If not, they will be downloaded
+# by this script automatically.
+#
+#  - $dl_dir/$release/$lang
+#      This directory contains the following files downloaded from
+#       https://mozilla-common-voice-datasets.s3.dualstack.us-west-2.amazonaws.com/${release}/${release}-${lang}.tar.gz
+#
+#     - clips
+#     - dev.tsv
+#     - invalidated.tsv
+#     - other.tsv
+#     - reported.tsv
+#     - test.tsv
+#     - train.tsv
+#     - validated.tsv
+
+dl_dir=$PWD/download
+release=cv-corpus-13.0-2023-03-09
+lang=en
+
+. shared/parse_options.sh || exit 1
+
+# All files generated by this script are saved in "data/${lang}".
+# You can safely remove "data/${lang}" and rerun this script to regenerate it.
+mkdir -p data/${lang}
+
+log() {
+  # This function is from espnet
+  local fname=${BASH_SOURCE[1]##*/}
+  echo -e "$(date '+%Y-%m-%d %H:%M:%S') (${fname}:${BASH_LINENO[0]}:${FUNCNAME[1]}) $*"
+}
+
+log "dl_dir: $dl_dir"
+
+if [ $stage -le 0 ] && [ $stop_stage -ge 0 ]; then
+  log "Stage 0: Download data"
+
+  # If you have pre-downloaded it to /path/to/$release,
+  # you can create a symlink
+  #
+  #   ln -sfv /path/to/$release $dl_dir/$release
+  #
+  if [ ! -d $dl_dir/$release/$lang/clips ]; then
+    lhotse download commonvoice --languages $lang --release $release $dl_dir
+  fi
+fi
+
+if [ $stage -le 1 ] && [ $stop_stage -ge 1 ]; then
+  log "Stage 1: Prepare CommonVoice manifest"
+  # We assume that you have downloaded the CommonVoice corpus
+  # to $dl_dir/$release
+  mkdir -p data/${lang}/manifests
+  if [ ! -e data/${lang}/manifests/.cv-${lang}.done ]; then
+    lhotse prepare commonvoice --language $lang -j $nj $dl_dir/$release data/${lang}/manifests
+    touch data/${lang}/manifests/.cv-${lang}.done
+  fi
+fi
+
+if [ $stage -le 2 ] && [ $stop_stage -ge 2 ]; then
+  log "Stage 2: Preprocess CommonVoice manifest"
+  if [ ! -e data/${lang}/fbank/.preprocess_complete ]; then
+    ./local/preprocess_commonvoice.py  --language $lang
+    touch data/${lang}/fbank/.preprocess_complete
+  fi
+fi
+
+if [ $stage -le 3 ] && [ $stop_stage -ge 3 ]; then
+  log "Stage 3: Compute fbank for dev and test subsets of CommonVoice"
+  mkdir -p data/${lang}/fbank
+  if [ ! -e data/${lang}/fbank/.cv-${lang}_dev_test.done ]; then
+    ./local/compute_fbank_commonvoice_dev_test.py --language $lang
+    touch data/${lang}/fbank/.cv-${lang}_dev_test.done
+  fi
+fi
+
+if [ $stage -le 4 ] && [ $stop_stage -ge 4 ]; then
+  log "Stage 4: Split train subset into ${num_splits} pieces"
+  split_dir=data/${lang}/fbank/cv-${lang}_train_split_${num_splits}
+  if [ ! -e $split_dir/.cv-${lang}_train_split.done ]; then
+    lhotse split $num_splits ./data/${lang}/fbank/cv-${lang}_cuts_train_raw.jsonl.gz $split_dir
+    touch $split_dir/.cv-${lang}_train_split.done
+  fi
+fi
+
+if [ $stage -le 5 ] && [ $stop_stage -ge 5 ]; then
+  log "Stage 5: Compute features for train subset of CommonVoice"
+  if [ ! -e data/${lang}/fbank/.cv-${lang}_train.done ]; then
+    ./local/compute_fbank_commonvoice_splits.py \
+      --num-workers $nj \
+      --batch-duration 600 \
+      --start 0 \
+      --num-splits $num_splits \
+      --language $lang
+    touch data/${lang}/fbank/.cv-${lang}_train.done
+  fi
+fi
+
+if [ $stage -le 6 ] && [ $stop_stage -ge 6 ]; then
+  log "Stage 6: Combine features for train"
+  if [ ! -f data/${lang}/fbank/cv-${lang}_cuts_train.jsonl.gz ]; then
+    pieces=$(find data/${lang}/fbank/cv-${lang}_train_split_${num_splits} -name "cv-${lang}_cuts_train.*.jsonl.gz")
+    lhotse combine $pieces data/${lang}/fbank/cv-${lang}_cuts_train.jsonl.gz
+  fi
+fi
diff --git a/egs/librispeech/ASR/prepare_giga_speech.sh b/egs/librispeech/ASR/prepare_giga_speech.sh
index 6f85ddc29..b077aaf3a 100755
--- a/egs/librispeech/ASR/prepare_giga_speech.sh
+++ b/egs/librispeech/ASR/prepare_giga_speech.sh
@@ -95,39 +95,45 @@ if [ $stage -le 1 ] && [ $stop_stage -ge 1 ]; then
   log "Stage 1: Prepare GigaSpeech manifest (may take 30 minutes)"
   # We assume that you have downloaded the GigaSpeech corpus
   # to $dl_dir/GigaSpeech
-  mkdir -p data/manifests
-  lhotse prepare gigaspeech \
-    --subset XL \
-    --subset L \
-    --subset M \
-    --subset S \
-    --subset XS \
-    --subset DEV \
-    --subset TEST \
-    -j $nj \
-    $dl_dir/GigaSpeech data/manifests
+  if [ ! -f data/manifests/.gigaspeech.done ]; then
+    mkdir -p data/manifests
+    lhotse prepare gigaspeech \
+      --subset XL \
+      --subset L \
+      --subset M \
+      --subset S \
+      --subset XS \
+      --subset DEV \
+      --subset TEST \
+      -j $nj \
+      $dl_dir/GigaSpeech data/manifests
+    touch data/manifests/.gigaspeech.done
+  fi
 fi
 
 if [ $stage -le 2 ] && [ $stop_stage -ge 2 ]; then
   log "Stage 2: Preprocess GigaSpeech manifest"
-  if [ ! -f data/fbank/.preprocess_complete ]; then
-   log "It may take 2 hours for this stage"
-   python3 ./local/preprocess_gigaspeech.py
-   touch data/fbank/.preprocess_complete
+  if [ ! -f data/fbank/.gigaspeech_preprocess.done ]; then
+    log "It may take 2 hours for this stage"
+    ./local/preprocess_gigaspeech.py
+    touch data/fbank/.gigaspeech_preprocess.done
   fi
 fi
 
 if [ $stage -le 3 ] && [ $stop_stage -ge 3 ]; then
   log "Stage 3: Compute features for DEV and TEST subsets of GigaSpeech (may take 2 minutes)"
-  python3 ./local/compute_fbank_gigaspeech_dev_test.py
+  if [ ! -f data/fbank/.gigaspeech_dev_test.done ]; then 
+    ./local/compute_fbank_gigaspeech_dev_test.py
+    touch data/fbank/.gigaspeech_dev_test.done
+  fi
 fi
 
 if [ $stage -le 4 ] && [ $stop_stage -ge 4 ]; then
   log "Stage 4: Split XL subset into ${num_splits} pieces"
   split_dir=data/fbank/gigaspeech_XL_split_${num_splits}
-  if [ ! -f $split_dir/.split_completed ]; then
+  if [ ! -f $split_dir/.gigaspeech_XL_split.done ]; then
     lhotse split-lazy ./data/fbank/gigaspeech_cuts_XL_raw.jsonl.gz $split_dir $chunk_size
-    touch $split_dir/.split_completed
+    touch $split_dir/.gigaspeech_XL_split.done
   fi
 fi
 
@@ -135,8 +141,19 @@ if [ $stage -le 5 ] && [ $stop_stage -ge 5 ]; then
   log "Stage 5: Compute features for XL"
   # Note: The script supports --start and --stop options.
   # You can use several machines to compute the features in parallel.
-  python3 ./local/compute_fbank_gigaspeech_splits.py \
-    --num-workers $nj \
-    --batch-duration 600 \
-    --num-splits $num_splits
+  if [ ! -f data/fbank/.gigaspeech_XL.done ]; then
+    ./local/compute_fbank_gigaspeech_splits.py \
+      --num-workers $nj \
+      --batch-duration 600 \
+      --num-splits $num_splits
+    touch data/fbank/.gigaspeech_XL.done
+  fi
+fi
+
+if [ $stage -le 6 ] && [ $stop_stage -ge 6 ]; then
+  log "Stage 6: Combine features for XL (may take 15 hours)"
+  if [ ! -f data/fbank/gigaspeech_cuts_XL.jsonl.gz ]; then
+    pieces=$(find data/fbank/gigaspeech_XL_split_${num_splits} -name "gigaspeech_cuts_XL.*.jsonl.gz")
+    lhotse combine $pieces data/fbank/gigaspeech_cuts_XL.jsonl.gz
+  fi
 fi
diff --git a/egs/librispeech/ASR/prepare_multidataset.sh b/egs/librispeech/ASR/prepare_multidataset.sh
new file mode 100755
index 000000000..c068305c0
--- /dev/null
+++ b/egs/librispeech/ASR/prepare_multidataset.sh
@@ -0,0 +1,373 @@
+#!/usr/bin/env bash
+
+# fix segmentation fault reported in https://github.com/k2-fsa/icefall/issues/674
+export PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python
+
+set -eou pipefail
+
+nj=16
+stage=-1
+stop_stage=100
+
+# We assume dl_dir (download dir) contains the following
+# directories and files. If not, they will be downloaded
+# by this script automatically.
+#
+#  - $dl_dir/LibriSpeech
+#      You can find BOOKS.TXT, test-clean, train-clean-360, etc, inside it.
+#      You can download them from https://www.openslr.org/12
+#
+#  - $dl_dir/lm
+#      This directory contains the following files downloaded from
+#       http://www.openslr.org/resources/11
+#
+#        - 3-gram.pruned.1e-7.arpa.gz
+#        - 3-gram.pruned.1e-7.arpa
+#        - 4-gram.arpa.gz
+#        - 4-gram.arpa
+#        - librispeech-vocab.txt
+#        - librispeech-lexicon.txt
+#        - librispeech-lm-norm.txt.gz
+#
+#  - $dl_dir/musan
+#      This directory contains the following directories downloaded from
+#       http://www.openslr.org/17/
+#
+#     - music
+#     - noise
+#     - speech
+
+# Split all dataset to this number of pieces and mix each dataset pieces
+# into multidataset pieces with shuffling.
+num_splits=1998
+
+dl_dir=$PWD/download
+
+. shared/parse_options.sh || exit 1
+
+# vocab size for sentence piece models.
+# It will generate data/lang_bpe_xxx,
+# data/lang_bpe_yyy if the array contains xxx, yyy
+vocab_sizes=(
+  # 5000
+  # 2000
+  # 1000
+  500
+)
+
+# multidataset list.
+# LibriSpeech and musan are required.
+# The others are optional.
+multidataset=(
+  "gigaspeech",
+  "commonvoice",
+)
+
+# All files generated by this script are saved in "data".
+# You can safely remove "data" and rerun this script to regenerate it.
+mkdir -p data
+
+log() {
+  # This function is from espnet
+  local fname=${BASH_SOURCE[1]##*/}
+  echo -e "$(date '+%Y-%m-%d %H:%M:%S') (${fname}:${BASH_LINENO[0]}:${FUNCNAME[1]}) $*"
+}
+
+log "dl_dir: $dl_dir"
+
+log "Dataset: LibriSpeech and musan"
+if [ $stage -le -1 ] && [ $stop_stage -ge -1 ]; then
+  log "Stage -1: Download LM"
+  mkdir -p $dl_dir/lm
+  if [ ! -e $dl_dir/lm/.done ]; then
+    ./local/download_lm.py --out-dir=$dl_dir/lm
+    touch $dl_dir/lm/.done
+  fi
+fi
+
+if [ $stage -le 0 ] && [ $stop_stage -ge 0 ]; then
+  log "Stage 0: Download data"
+
+  # If you have pre-downloaded it to /path/to/LibriSpeech,
+  # you can create a symlink
+  #
+  #   ln -sfv /path/to/LibriSpeech $dl_dir/LibriSpeech
+  #
+  if [ ! -d $dl_dir/LibriSpeech/train-other-500 ]; then
+    lhotse download librispeech --full $dl_dir
+  fi
+
+  # If you have pre-downloaded it to /path/to/musan,
+  # you can create a symlink
+  #
+  #   ln -sfv /path/to/musan $dl_dir/
+  #
+  if [ ! -d $dl_dir/musan ]; then
+    lhotse download musan $dl_dir
+  fi
+fi
+
+if [ $stage -le 1 ] && [ $stop_stage -ge 1 ]; then
+  log "Stage 1: Prepare LibriSpeech manifest"
+  # We assume that you have downloaded the LibriSpeech corpus
+  # to $dl_dir/LibriSpeech
+  mkdir -p data/manifests
+  if [ ! -e data/manifests/.librispeech.done ]; then
+    lhotse prepare librispeech -j $nj $dl_dir/LibriSpeech data/manifests
+    touch data/manifests/.librispeech.done
+  fi
+fi
+
+if [ $stage -le 2 ] && [ $stop_stage -ge 2 ]; then
+  log "Stage 2: Prepare musan manifest"
+  # We assume that you have downloaded the musan corpus
+  # to data/musan
+  mkdir -p data/manifests
+  if [ ! -e data/manifests/.musan.done ]; then
+    lhotse prepare musan $dl_dir/musan data/manifests
+    touch data/manifests/.musan.done
+  fi
+fi
+
+if [ $stage -le 3 ] && [ $stop_stage -ge 3 ]; then
+  log "Stage 3: Compute fbank for librispeech"
+  mkdir -p data/fbank
+  if [ ! -e data/fbank/.librispeech.done ]; then
+    ./local/compute_fbank_librispeech.py --perturb-speed False
+    touch data/fbank/.librispeech.done
+  fi
+
+  if [ ! -f data/fbank/librispeech_cuts_train-all-shuf.jsonl.gz ]; then
+    cat <(gunzip -c data/fbank/librispeech_cuts_train-clean-100.jsonl.gz) \
+      <(gunzip -c data/fbank/librispeech_cuts_train-clean-360.jsonl.gz) \
+      <(gunzip -c data/fbank/librispeech_cuts_train-other-500.jsonl.gz) | \
+      shuf | gzip -c > data/fbank/librispeech_cuts_train-all-shuf.jsonl.gz
+  fi
+
+  if [ ! -e data/fbank/.librispeech-validated.done ]; then
+    log "Validating data/fbank for LibriSpeech"
+    parts=(
+      train-clean-100
+      train-clean-360
+      train-other-500
+      test-clean
+      test-other
+      dev-clean
+      dev-other
+    )
+    for part in ${parts[@]}; do
+      python3 ./local/validate_manifest.py \
+        data/fbank/librispeech_cuts_${part}.jsonl.gz
+    done
+    touch data/fbank/.librispeech-validated.done
+  fi
+fi
+
+if [ $stage -le 4 ] && [ $stop_stage -ge 4 ]; then
+  log "Stage 4: Compute fbank for musan"
+  mkdir -p data/fbank
+  if [ ! -e data/fbank/.musan.done ]; then
+    ./local/compute_fbank_musan.py
+    touch data/fbank/.musan.done
+  fi
+fi
+
+if [ $stage -le 5 ] && [ $stop_stage -ge 5 ]; then
+  log "Stage 5: Prepare phone based lang"
+  lang_dir=data/lang_phone
+  mkdir -p $lang_dir
+
+  (echo '!SIL SIL'; echo '<SPOKEN_NOISE> SPN'; echo '<UNK> SPN'; ) |
+    cat - $dl_dir/lm/librispeech-lexicon.txt |
+    sort | uniq > $lang_dir/lexicon.txt
+
+  if [ ! -f $lang_dir/L_disambig.pt ]; then
+    ./local/prepare_lang.py --lang-dir $lang_dir
+  fi
+
+  if [ ! -f $lang_dir/L.fst ]; then
+    log "Converting L.pt to L.fst"
+    ./shared/convert-k2-to-openfst.py \
+      --olabels aux_labels \
+      $lang_dir/L.pt \
+      $lang_dir/L.fst
+  fi
+
+  if [ ! -f $lang_dir/L_disambig.fst ]; then
+    log "Converting L_disambig.pt to L_disambig.fst"
+    ./shared/convert-k2-to-openfst.py \
+      --olabels aux_labels \
+      $lang_dir/L_disambig.pt \
+      $lang_dir/disambig_L.fst
+  fi
+fi
+
+if [ $stage -le 6 ] && [ $stop_stage -ge 6 ]; then
+  log "Stage 6: Prepare BPE based lang"
+
+  for vocab_size in ${vocab_sizes[@]}; do
+    lang_dir=data/lang_bpe_${vocab_size}
+    mkdir -p $lang_dir
+    # We reuse words.txt from phone based lexicon
+    # so that the two can share G.pt later.
+    cp data/lang_phone/words.txt $lang_dir
+
+    if [ ! -f $lang_dir/transcript_words.txt ]; then
+      log "Generate data for BPE training"
+      files=$(
+        find "$dl_dir/LibriSpeech/train-clean-100" -name "*.trans.txt"
+        find "$dl_dir/LibriSpeech/train-clean-360" -name "*.trans.txt"
+        find "$dl_dir/LibriSpeech/train-other-500" -name "*.trans.txt"
+      )
+      for f in ${files[@]}; do
+        cat $f | cut -d " " -f 2-
+      done > $lang_dir/transcript_words.txt
+    fi
+
+    if [ ! -f $lang_dir/bpe.model ]; then
+      ./local/train_bpe_model.py \
+        --lang-dir $lang_dir \
+        --vocab-size $vocab_size \
+        --transcript $lang_dir/transcript_words.txt
+    fi
+
+    if [ ! -f $lang_dir/L_disambig.pt ]; then
+      ./local/prepare_lang_bpe.py --lang-dir $lang_dir
+
+      log "Validating $lang_dir/lexicon.txt"
+      ./local/validate_bpe_lexicon.py \
+        --lexicon $lang_dir/lexicon.txt \
+        --bpe-model $lang_dir/bpe.model
+    fi
+
+    if [ ! -f $lang_dir/L.fst ]; then
+      log "Converting L.pt to L.fst"
+      ./shared/convert-k2-to-openfst.py \
+        --olabels aux_labels \
+        $lang_dir/L.pt \
+        $lang_dir/L.fst
+    fi
+
+    if [ ! -f $lang_dir/L_disambig.fst ]; then
+      log "Converting L_disambig.pt to L_disambig.fst"
+      ./shared/convert-k2-to-openfst.py \
+        --olabels aux_labels \
+        $lang_dir/L_disambig.pt \
+        $lang_dir/L_disambig.fst
+    fi
+  done
+fi
+
+if [ $stage -le 7 ] && [ $stop_stage -ge 7 ]; then
+  log "Stage 7: Prepare G"
+  # We assume you have install kaldilm, if not, please install
+  # it using: pip install kaldilm
+
+  mkdir -p data/lm
+  if [ ! -f data/lm/G_3_gram.fst.txt ]; then
+    # It is used in building HLG
+    python3 -m kaldilm \
+      --read-symbol-table="data/lang_phone/words.txt" \
+      --disambig-symbol='#0' \
+      --max-order=3 \
+      $dl_dir/lm/3-gram.pruned.1e-7.arpa > data/lm/G_3_gram.fst.txt
+  fi
+
+  if [ ! -f data/lm/G_4_gram.fst.txt ]; then
+    # It is used for LM rescoring
+    python3 -m kaldilm \
+      --read-symbol-table="data/lang_phone/words.txt" \
+      --disambig-symbol='#0' \
+      --max-order=4 \
+      $dl_dir/lm/4-gram.arpa > data/lm/G_4_gram.fst.txt
+  fi
+fi
+
+if [ $stage -le 8 ] && [ $stop_stage -ge 8 ]; then
+  log "Stage 8: Compile HLG"
+  ./local/compile_hlg.py --lang-dir data/lang_phone
+
+  # Note If ./local/compile_hlg.py throws OOM,
+  # please switch to the following command
+  #
+  # ./local/compile_hlg_using_openfst.py --lang-dir data/lang_phone
+
+  for vocab_size in ${vocab_sizes[@]}; do
+    lang_dir=data/lang_bpe_${vocab_size}
+    ./local/compile_hlg.py --lang-dir $lang_dir
+
+    # Note If ./local/compile_hlg.py throws OOM,
+    # please switch to the following command
+    #
+    # ./local/compile_hlg_using_openfst.py --lang-dir $lang_dir
+  done
+fi
+
+# Compile LG for RNN-T fast_beam_search decoding
+if [ $stage -le 9 ] && [ $stop_stage -ge 9 ]; then
+  log "Stage 9: Compile LG"
+  ./local/compile_lg.py --lang-dir data/lang_phone
+
+  for vocab_size in ${vocab_sizes[@]}; do
+    lang_dir=data/lang_bpe_${vocab_size}
+    ./local/compile_lg.py --lang-dir $lang_dir
+  done
+fi
+
+if [ $stage -le 10 ] && [ $stop_stage -ge 10 ]; then
+  log "Stage 10: Prepare the other datasets"
+  # GigaSpeech
+  if [[ "${multidataset[@]}" =~ "gigaspeech" ]]; then
+    log "Dataset: GigaSpeech"
+    ./prepare_giga_speech.sh --stop_stage 5
+  fi
+
+  # CommonVoice
+  if [[ "${multidataset[@]}" =~ "commonvoice" ]]; then
+    log "Dataset: CommonVoice"
+    ./prepare_common_voice.sh
+  fi
+fi
+
+if [ $stage -le 11 ] && [ $stop_stage -ge 11 ]; then
+  log "Stage 11: Create multidataset"
+  split_dir=data/fbank/multidataset_split_${num_splits}
+  if [ ! -f data/fbank/multidataset_split/.multidataset.done ]; then
+    mkdir -p $split_dir/multidataset
+    log "Split LibriSpeech"
+    if [ ! -f $split_dir/.librispeech_split.done ]; then
+      lhotse split $num_splits ./data/fbank/librispeech_cuts_train-all-shuf.jsonl.gz $split_dir
+      touch $split_dir/.librispeech_split.done
+    fi
+
+    if [[ "${multidataset[@]}" =~ "gigaspeech" ]]; then
+      log "Split GigaSpeech XL"
+      if [ ! -f $split_dir/.gigaspeech_XL_split.done ]; then
+	cd $split_dir
+        ln -sv ../gigaspeech_XL_split_2000/gigaspeech_cuts_XL.*.jsonl.gz .
+        cd ../../..	
+	touch $split_dir/.gigaspeech_XL_split.done
+      fi
+    fi
+
+    if [[ "${multidataset[@]}" =~ "commonvoice" ]]; then
+      log "Split CommonVoice"
+      if [ ! -f $split_dir/.cv-en_train_split.done ]; then
+        lhotse split $num_splits ./data/en/fbank/cv-en_cuts_train.jsonl.gz $split_dir
+        touch $split_dir/.cv-en_train_split.done
+      fi
+    fi
+
+    if [ ! -f $split_dir/.multidataset_mix.done ]; then
+      log "Mix multidataset"
+      for ((seq=1; seq<=$num_splits; seq++)); do
+	fseq=$(printf "%04d" $seq)
+	gunzip -c $split_dir/*.*${fseq}.jsonl.gz | \
+	  shuf | gzip -c > $split_dir/multidataset/multidataset_cuts_train.${fseq}.jsonl.gz
+      done
+      touch $split_dir/.multidataset_mix.done
+    fi
+
+    touch data/fbank/multidataset_split/.multidataset.done
+  fi
+fi
diff --git a/egs/librispeech/ASR/pruned_transducer_stateless3/gigaspeech.py b/egs/librispeech/ASR/pruned_transducer_stateless3/gigaspeech.py
index 598434f54..f3bd6284e 100644
--- a/egs/librispeech/ASR/pruned_transducer_stateless3/gigaspeech.py
+++ b/egs/librispeech/ASR/pruned_transducer_stateless3/gigaspeech.py
@@ -30,7 +30,7 @@ class GigaSpeech:
         """
         Args:
           manifest_dir:
-            It is expected to contain the following files::
+            It is expected to contain the following files:
 
                 - gigaspeech_XL_split_2000/gigaspeech_cuts_XL.*.jsonl.gz
                 - gigaspeech_cuts_L_raw.jsonl.gz
diff --git a/egs/librispeech/ASR/pruned_transducer_stateless7/multidataset.py b/egs/librispeech/ASR/pruned_transducer_stateless7/multidataset.py
new file mode 100644
index 000000000..dcb4cd141
--- /dev/null
+++ b/egs/librispeech/ASR/pruned_transducer_stateless7/multidataset.py
@@ -0,0 +1,53 @@
+# Copyright      2023  Xiaomi Corp.        (authors: Yifan Yang)
+#
+# See ../../../../LICENSE for clarification regarding multiple authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+import glob
+import logging
+import re
+from pathlib import Path
+
+import lhotse
+from lhotse import CutSet, load_manifest_lazy
+
+
+class MultiDataset:
+    def __init__(self, manifest_dir: str):
+        """
+        Args:
+          manifest_dir:
+            It is expected to contain the following files:
+
+            - multidataset_split_1998/multidataset/multidataset_cuts_train.*.jsonl.gz
+        """
+        self.manifest_dir = Path(manifest_dir)
+
+    def train_cuts(self) -> CutSet:
+        logging.info("About to get multidataset train cuts")
+
+        filenames = glob.glob(
+            f"{self.manifest_dir}/multidataset_split_1998/multidataset/multidataset_cuts_train.*.jsonl.gz"
+        )
+
+        pattern = re.compile(r"multidataset_cuts_train.([0-9]+).jsonl.gz")
+        idx_filenames = ((int(pattern.search(f).group(1)), f) for f in filenames)
+        idx_filenames = sorted(idx_filenames, key=lambda x: x[0])
+
+        sorted_filenames = [f[1] for f in idx_filenames]
+
+        logging.info(f"Loading {len(sorted_filenames)} splits")
+
+        return lhotse.combine(lhotse.load_manifest_lazy(p) for p in sorted_filenames)
diff --git a/egs/librispeech/ASR/pruned_transducer_stateless7/train.py b/egs/librispeech/ASR/pruned_transducer_stateless7/train.py
index 792a243e5..01c9500ce 100755
--- a/egs/librispeech/ASR/pruned_transducer_stateless7/train.py
+++ b/egs/librispeech/ASR/pruned_transducer_stateless7/train.py
@@ -1,8 +1,9 @@
 #!/usr/bin/env python3
-# Copyright    2021-2022  Xiaomi Corp.        (authors: Fangjun Kuang,
+# Copyright    2021-2023  Xiaomi Corp.        (authors: Fangjun Kuang,
 #                                                       Wei Kang,
-#                                                       Mingshuang Luo,)
-#                                                       Zengwei Yao)
+#                                                       Mingshuang Luo,
+#                                                       Zengwei Yao,
+#                                                       Yifan   Yang)
 #
 # See ../../../../LICENSE for clarification regarding multiple authors
 #
@@ -59,6 +60,7 @@ import torch
 import torch.multiprocessing as mp
 import torch.nn as nn
 from asr_datamodule import LibriSpeechAsrDataModule
+from multidataset import MultiDataset
 from decoder import Decoder
 from joiner import Joiner
 from lhotse.cut import Cut
@@ -374,6 +376,13 @@ def get_parser():
         help="Whether to use half precision training.",
     )
 
+    parser.add_argument(
+        "--use-multidataset",
+        type=str2bool,
+        default=False,
+        help="Whether to use multidataset to train.",
+    )
+
     add_model_arguments(parser)
 
     return parser
@@ -1043,10 +1052,14 @@ def run(rank, world_size, args):
 
     librispeech = LibriSpeechAsrDataModule(args)
 
-    if params.full_libri:
-        train_cuts = librispeech.train_all_shuf_cuts()
+    if params.use_multidataset:
+        multidataset = MultiDataset(params.manifest_dir)
+        train_cuts = multidataset.train_cuts()
     else:
-        train_cuts = librispeech.train_clean_100_cuts()
+        if params.full_libri:
+            train_cuts = librispeech.train_all_shuf_cuts()
+        else:
+            train_cuts = librispeech.train_clean_100_cuts()
 
     def remove_short_and_long_utt(c: Cut):
         # Keep only utterances with duration between 1 second and 20 seconds
@@ -1058,9 +1071,6 @@ def run(rank, world_size, args):
         # an utterance duration distribution for your dataset to select
         # the threshold
         if c.duration < 1.0 or c.duration > 20.0:
-            logging.warning(
-                f"Exclude cut with ID {c.id} from training. Duration: {c.duration}"
-            )
             return False
 
         # In pruned RNN-T, we require that T >= S
@@ -1102,7 +1112,7 @@ def run(rank, world_size, args):
     valid_cuts += librispeech.dev_other_cuts()
     valid_dl = librispeech.valid_dataloaders(valid_cuts)
 
-    if not params.print_diagnostics:
+    if not params.use_multidataset and not params.print_diagnostics:
         scan_pessimistic_batches_for_oom(
             model=model,
             train_dl=train_dl,