Add Python API examples for speaker recognition with VAD and ASR. (#532)

python-api-examples/speaker-identification.py

@@ -1,7 +1,8 @@
 #!/usr/bin/env python3
 
 """
-This script shows how to use Python APIs for speaker identification.
+This script shows how to use Python APIs for speaker identification with
+a microphone.
 
 Usage:
 
@@ -43,6 +44,7 @@ python3 ./python-api-examples/speaker-identification.py \
 """
 import argparse
 import queue
+import sys
 import threading
 from collections import defaultdict
 from pathlib import Path
@@ -151,7 +153,7 @@ def compute_speaker_embedding(
     filenames: List[str],
     extractor: sherpa_onnx.SpeakerEmbeddingExtractor,
 ) -> np.ndarray:
-    assert len(filenames) > 0, f"filenames is empty"
+    assert len(filenames) > 0, "filenames is empty"
 
     ans = None
     for filename in filenames:
@@ -215,7 +217,7 @@ def main():
     global g_stop
     global g_read_mic_thread
     while True:
-        key = input("Press enter to start recording")
+        key = input("Press Enter to start recording")
         if key.lower() in ("q", "quit"):
             g_stop = True
             break
@@ -224,7 +226,7 @@ def main():
         g_buffer.queue.clear()
         g_read_mic_thread = threading.Thread(target=read_mic)
         g_read_mic_thread.start()
-        input("Press enter to stop recording")
+        input("Press Enter to stop recording")
         g_stop = True
         g_read_mic_thread.join()
         print("Compute embedding")