[Numpy-discussion] hashing dtypes, new variation, old theme

Charles R Harris charlesr.harris@gmail....
Wed Mar 16 10:27:49 CDT 2011


On Wed, Mar 16, 2011 at 8:56 AM, Charles R Harris <charlesr.harris@gmail.com
> wrote:

>
>
> On Wed, Mar 16, 2011 at 8:46 AM, Robert Kern <robert.kern@gmail.com>wrote:
>
>> On Wed, Mar 16, 2011 at 01:18, Matthew Brett <matthew.brett@gmail.com>
>> wrote:
>> > Hi,
>> >
>> > Running the test suite for one of our libraries, there seems to have
>> > been a recent breakage of the behavior of dtype hashing.
>> >
>> > This script:
>> >
>> > import numpy as np
>> >
>> > data0 = np.arange(10)
>> > data1 = data0 - 10
>> >
>> > dt0 = data0.dtype
>> > dt1 = data1.dtype
>> >
>> > assert dt0 == dt1 # always passes
>> > assert hash(dt0) == hash(dt1) # fails on latest
>> >
>> > fails on the current latest-ish - aada93306  and passes on a stock
>> 1.5.0.
>> >
>> > Is this expected?
>>
>> According to "git log hashdescr.c", nothing has changed in the
>> implementation of the hash function since Oct 31, before numpy 1.5.1
>> which also passes the second test. I'm not sure what would be causing
>> the difference in HEAD.
>>
>>
> The 1.5.1 branch was based on 1.5.x, not master.
>
>
David's change isn't in 1.5.x, so apparently it wasn't backported.

Chuck
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