Format code (#1162)

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tools/infer/infer-pm-index256.py

@@ -4,6 +4,7 @@
 """
 import os
 import logging
+
 logger = logging.getLogger(__name__)
 
 import parselmouth

tools/infer/train-index-v2.py

@@ -4,6 +4,7 @@
 import os
 import traceback
 import logging
+
 logger = logging.getLogger(__name__)
 
 from multiprocessing import cpu_count

tools/infer/train-index.py

@@ -3,6 +3,7 @@
 """
 import os
 import logging
+
 logger = logging.getLogger(__name__)
 
 import faiss