Fix attribute error on win (#10209)

ppocr/data/__init__.py

@@ -53,7 +53,13 @@ def term_mp(sig_num, frame):
 
 def set_signal_handlers():
     pid = os.getpid()
-    pgid = os.getpgid(os.getpid())
+    try:
+        pgid = os.getpgid(pid)
+    except AttributeError:
+        # In case `os.getpgid` is not available, no signal handler will be set,
+        # because we cannot do safe cleanup.
+        pass
+    else:
         # XXX: `term_mp` kills all processes in the process group, which in 
         # some cases includes the parent process of current process and may 
         # cause unexpected results. To solve this problem, we set signal