fix dataset dir

examples/aishell/local/run_data.sh

@@ -3,7 +3,7 @@
 # download data, generate manifests
 PYTHONPATH=.:$PYTHONPATH python3 local/aishell.py \
 --manifest_prefix="data/manifest" \
---target_dir="./dataset/aishell"
+--target_dir="${MAIN_ROOT}/dataset/aishell"
 
 if [ $? -ne 0 ]; then
     echo "Prepare Aishell failed. Terminated."

examples/librispeech/local/run_data.sh

@@ -3,7 +3,7 @@
 # download data, generate manifests
 PYTHONPATH=.:$PYTHONPATH python3 local/librispeech.py \
 --manifest_prefix="data/manifest" \
---target_dir="./dataset/librispeech" \
+--target_dir="{MAIN_ROOT}/dataset/librispeech" \
 --full_download="True"
 
 if [ $? -ne 0 ]; then