Sample windows

[liluxuan1997]

Hi，ranjaykrishna：
I think there's one problem in data.py. In line 218, the default setting of argument 'replace' in np.random.choice() is True, which will lead repeated sampling windows. So in my opinion, the correct form should be:
sample = np.random.choice(nWindows, self.max_W, replace=False)
Though I don't how much it will affect the performance.

[mugenggeng]

Sorry to bother you, could you please provide a copy of your data set hd5y file, because the official download is no longer available, thank you very much, my email is :mugenggeng@163.com