Hyperband bracket generation is inconsistent with the original Hyperband paper

[nabenabe0928]

The BOHB paper says that each SH bracket samples $n = \lceil \frac{s_{\max} + 1}{s + 1} \eta^s \rceil$ configurations; however, this line samples $n = \lfloor\lfloor \frac{s_{\max} + 1}{s + 1} \rfloor \eta^s\rfloor$ configurations.
In reality, this line should be:

n0 = int(np.ceil(self.max_SH_iter / (s + 1) * self.eta ** s))

Note that self.max_SH_iter is $s_{\max} + 1$.

[Neeratyoy]

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