minor updates

egs/swbd/ASR/prepare.sh

@@ -145,6 +145,13 @@ if [ $stage -le 2 ] && [ $stop_stage -ge 2 ]; then
     fi
 fi
 
+log "
+Computing fbank for SwitchBoard and MUSAN noise.
+
+Note that the current setup upsamples the audio to 16kHz before fbank extraction
+please use prepare_nb.sh if you want to use 8kHz audio for narrowband systems.
+"
+
 if [ $stage -le 3 ] && [ $stop_stage -ge 3 ]; then
     log "Stage 3 I: Compute fbank for SwitchBoard"
     if [ ! -e data/fbank/.swbd.done ]; then

egs/swbd/ASR/prepare_nb.sh

@@ -0,0 +1,96 @@
+#!/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=15
+stage=-1
+stop_stage=100
+
+# We assume dl_dir (download dir) contains the following
+# directories and files. Most of them can't be downloaded automatically
+# as they are not publically available and require a license purchased
+# from the LDC.
+#
+#  - $dl_dir/musan
+#      This directory contains the following directories downloaded from
+#       http://www.openslr.org/17/
+#
+#     - music
+#     - noise
+#     - speech
+
+dl_dir=./download
+# swbd1_dir="/export/corpora3/LDC/LDC97S62"
+swbd1_dir=./download/LDC97S62/
+
+# eval2000_dir contains the following files and directories
+# downloaded from LDC website:
+#  - LDC2002S09
+#       - hub5e_00
+#  - LDC2002T43
+#       - reference
+eval2000_dir="/export/corpora2/LDC/eval2000"
+
+rt03_dir="/export/corpora/LDC/LDC2007S10"
+fisher_dir="/export/corpora3/LDC/LDC2004T19"
+
+. shared/parse_options.sh || exit 1
+
+# vocab size for sentence piece models.
+# It will generate data/lang_bpe_xxx,
+# data/lang_bpe_yyy if the array contains xxx, yyy
+vocab_sizes=(
+    # 5000
+    # 2000
+    1000
+    500
+)
+
+# All files generated by this script are saved in "data".
+# You can safely remove "data" and rerun this script to regenerate it.
+mkdir -p data
+
+log() {
+    # This function is from espnet
+    local fname=${BASH_SOURCE[1]##*/}
+    echo -e "$(date '+%Y-%m-%d %H:%M:%S') (${fname}:${BASH_LINENO[0]}:${FUNCNAME[1]}) $*"
+}
+
+log "swbd1_dir: $swbd1_dir"
+log "eval2000_dir: $eval2000_dir"
+log "rt03_dir: $rt03_dir"
+
+if [ $stage -le 1 ] && [ $stop_stage -ge 1 ]; then
+    log "Stage 1 I: Compute narrowband fbank for SwitchBoard"
+    if [ ! -e data/fbank_nb/.swbd.done ]; then
+        mkdir -p data/fbank_nb/swbd_split${num_splits}/
+        for index in $(seq 1 16); do
+            ./local/compute_fbank_swbd_nb.py --split-index ${index} &
+        done
+        wait
+        pieces=$(find data/fbank_nb/swbd_split${num_splits} -name "swbd_cuts_all.*.jsonl.gz")
+        lhotse combine $pieces data/fbank_nb/swbd_cuts_all.jsonl.gz
+        touch data/fbank_nb/.swbd.done
+    fi
+fi
+
+if [ $stage -le 1 ] && [ $stop_stage -ge 1 ]; then
+    log "Stage 1 II: Compute narrowband fbank for eval2000"
+    if [ ! -e data/fbank_nb/.eval2000.done ]; then
+        mkdir -p data/fbank_nb/eval2000/
+        ./local/compute_fbank_eval2000_nb.py 
+        touch data/fbank_nb/.eval2000.done
+    fi
+fi
+
+if [ $stage -le 2 ] && [ $stop_stage -ge 2 ]; then
+    log "Stage 2: Compute narrowband fbank for musan"
+    mkdir -p data/fbank_nb/
+    if [ ! -e data/fbank_nb/.musan.done ]; then
+        ./local/compute_fbank_musan_nb.py
+        touch data/fbank_nb/.musan.done
+    fi
+fi