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Large scalar powers hang #17148

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eric-wieser opened this issue Aug 24, 2020 · 2 comments
Closed

Large scalar powers hang #17148

eric-wieser opened this issue Aug 24, 2020 · 2 comments

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@eric-wieser
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In [57]: np.int64(2)**(2**62)
Out[57]: 0

In [58]: np.int64(2)**(2**63)
<ipython-input-58-7f1b37f891d0>:1: RuntimeWarning: overflow encountered in power
  np.int64(2)**(2**63)
Out[58]: inf

In [59]: np.int64(2)**(2**64)
# seems to be doing the computation on object arrays?
@seberg
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seberg commented Aug 24, 2020

This seems like yet another nice example for gh-16287.

If we were to deprecate Python integer to object array coercion (and unsigned integers at least), the second and third examples would be an error. Although that is likely better than the current situation.

@seberg
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seberg commented Nov 19, 2022

Related to gh-22624 and gh-16287. Going to close this, since I don't think the hanging is the important issue (but the other two are).

@seberg seberg closed this as completed Nov 19, 2022
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@seberg @eric-wieser