def __len__(self):
    if self.train:
        if (self.meta is True):
            return self.num_meta
        else:
            return (50000 - self.num_meta)
    else:
        return 10000
def __len__(self):
    if self.train:
        if (self.meta is True):
            return self.num_meta
        else:
            return (50000 - self.num_meta)
    else:
        return 10000