cityhash | Automatically exported from code.google.com/p/cityhash | Hashing library
kandi X-RAY | cityhash Summary
kandi X-RAY | cityhash Summary
CityHash provides hash functions for strings. The functions mix the input bits thoroughly but are not suitable for cryptography. See "Hash Quality," below, for details on how CityHash was tested and so on. We provide reference implementations in C++, with a friendly MIT license. CityHash32() returns a 32-bit hash. CityHash64() and similar return a 64-bit hash. CityHash128() and similar return a 128-bit hash and are tuned for strings of at least a few hundred bytes. Depending on your compiler and hardware, it’s likely faster than CityHash64() on sufficiently long strings. It’s slower than necessary on shorter strings, but we expect that case to be relatively unimportant. CityHashCrc128() and similar are variants of CityHash128() that depend on _mm_crc32_u64(), an intrinsic that compiles to a CRC32 instruction on some CPUs. However, none of the functions we provide are CRCs. CityHashCrc256() is a variant of CityHashCrc128() that also depends on _mm_crc32_u64(). It returns a 256-bit hash. All members of the CityHash family were designed with heavy reliance on previous work by Austin Appleby, Bob Jenkins, and others. For example, CityHash32 has many similarities with Murmur3a.
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QUESTION
I am trying to install tensorflow 2.0 beta on my windows machine using pip. I am using the requirements.txt from https://github.com/ageron/handson-ml2/blob/master/requirements.txt
The only change I have made is to use the beta tensorflow version instead of the tf-nightly-preview version.
#tf-nightly-2.0-preview
#tf-nightly-gpu-2.0-preview
tensorflow-gpu==2.0.0-beta1
I am getting three errors -
...ANSWER
Answered 2019-Jul-07 at 06:52In the newer commits for tfds - the cityhash library has been swapped with siphash.
For tensorflow the tb_nightly dependency is expected to be updated mid-July so if installing after that - the issue may not even arise.
Since cloudpickle versions for two packages are different need to upgrade one of them or downgrade the other.
QUESTION
I am attempting to install clickhouse-cityhash
with pip
on OSX 10.14.5 but it fails with the following (abridged) output:
ANSWER
Answered 2019-Jun-11 at 22:43Many thanks to @PeterCordes for his very valuable observations in the question comments above!
The failing build command during pip install clickhouse-cityhash
included the -arch i386
flag. The default behaviour of x86 clang is to build 64-bit code despite the presence of this flag.
However, this does not appear to be Apple clang's default behaviour. If 32-bit code is generated then _mm_crc32_u32
would the largest CRC available, implying that _mm_crc32_u64
is not defined.
Therefore, one solution is not to use Apple clang.
Most developers using OSX will be familiar with the brew
package manager and have it installed. You may find that you already have a version of gcc
installed via brew
as a dependency of another package.
Check with the following:
QUESTION
I want to hash strings of variable length (6-60 characters long) to 32-bit signed integers in order to save disk space in PostgreSQL.
I don't want to encrypt any data, and the hashing function needs to be reproducible and callable from Python. The problem is that I can only find Algorithms that produce unsigned integers (like CityHash), which therefore produce values of up to 2^32 instead of 2^31.
This is what I have thus far:
...ANSWER
Answered 2017-Jul-24 at 12:53create or replace function int_hash(s text)
returns int as $$
select ('x' || left(md5(s), 8))::bit(32)::int
;
$$ language sql immutable;
select int_hash('1');
int_hash
------------
-993377736
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