add script for calc RTF

demos/streaming_asr_server/websocket_client.py

@@ -13,6 +13,9 @@
 # limitations under the License.
 #!/usr/bin/python
 # -*- coding: UTF-8 -*-
+
+# script for calc RTF: grep -rn RTF log.txt | awk '{print $NF}' | awk -F "=" '{sum += $NF} END {print "all time",sum, "audio num", NR,  "RTF", sum/NR}'
+
 import argparse
 import asyncio
 import codecs