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+GestureData 手势数据 v1.0
+文件格式：
+每个数据集（npz文件）包含：
+1个标签label（手势标签，整个数据集都是这一个标签）；
+500组数据data（每组数据是21*3，即21个点的3维数据，就是demo.py-find_position()中的lm.x, lm.y, lm.z）；
+左右手区分handtype（0为左手，1为右手）；
+画布大小shape（一般都是720*1280，对应demo.py-find_position()中的w, h）。
+
+注意事项：
+1. 在使用之前建议先熟悉npz文件的读写与使用（很简单的）；
+2. 数据集shape类最后会保存一个[0, 0]，其他都是正常的[720, 1280]；
+3. 左右手不建议使用，因为面向屏幕的手心手背就可以导致程序的误判。
+
+更新说明：
+1. 保存了0~9的手势。
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