add functional tools

Author: Liyulingyue

tools/count_sample.py

@@ -0,0 +1,9 @@
+# 统计 samples 目录下， graph_net.json 文件的数量
+import os
+
+graph_net_count = 0
+for root, dirs, files in os.walk("../samples"):
+    for file in files:
+        if file == "graph_net.json":
+            graph_net_count += 1
+print(f"Number of graph_net.json files: {graph_net_count}")