發送短信 : Device scheduling and assignment in hierarchical federated learning for Internet of Thing

 _    _      ___      _____     ______    _____   
| \  / ||   / _ \\   /  ___||  /_   _//  / ____|| 
|  \/  ||  / //\ \\ | // __     -| ||-  / //---`' 
| .  . || |  ___  ||| \\_\ ||   _| ||_  \ \\___   
|_|\/|_|| |_||  |_|| \____//   /_____//  \_____|| 
`-`  `-`  `-`   `-`   `---`    `-----`    `----`