example usage

egs/librispeech/ASR/distillation_with_hubert.sh

@@ -1,4 +1,15 @@
+# This is an example to do distillation with librispeech clean-100 subset.
+# run with command:
+# bash distillation_with_hubert.sh [0|1|2|3|4]
+#
+# For example command
+# bash distillation_with_hubert.sh 0
+# will download hubert model.
 stage=$1
+
+# Set the GPUs available.
+# This script requires at least one GPU.
+# Example:
 export CUDA_VISIBLE_DEVICES="2,3,4,5"
 
 
@@ -23,13 +34,17 @@ if [ $stage -eq 0 ]; then
   hubert_model=${hubert_model_dir}/${model_id}.pt
   mkdir -p ${hubert_model_dir}
   # For more models refer to: https://github.com/pytorch/fairseq/tree/main/examples/hubert
-  wget -c https://dl.fbaipublicfiles.com/hubert/${model_id} -P ${hubert_model_dir}
-  wget -c wget https://dl.fbaipublicfiles.com/fairseq/wav2vec/dict.ltr.txt -P ${hubert_model_dir}
+  if [ -f ${hubert_model} ]; then
+    echo "hubert model alread exists."
+  else
+    wget -c https://dl.fbaipublicfiles.com/hubert/${model_id} -P ${hubert_model}
+    wget -c wget https://dl.fbaipublicfiles.com/fairseq/wav2vec/dict.ltr.txt -P ${hubert_model_dir}
+  fi
 fi
 
 if [ ! -d ./data/fbank ]; then
   echo "This script assumes ./data/fbank is already generated by prepare.sh"
-  exit 0
+  exit 1
 fi
 
 if [ $stage -eq 1 ]; then