cityhash | Automatically exported from code.google.com/p/cityhash | Hashing library

 by   google Shell Version: Current License: MIT

kandi X-RAY | cityhash Summary

kandi X-RAY | cityhash Summary

cityhash is a Shell library typically used in Security, Hashing applications. cityhash has no bugs, it has a Permissive License and it has medium support. However cityhash has 1 vulnerabilities. You can download it from GitHub.

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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            kandi-support Support

              cityhash has a medium active ecosystem.
              It has 957 star(s) with 176 fork(s). There are 41 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              There are 9 open issues and 23 have been closed. On average issues are closed in 1 days. There are 3 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of cityhash is current.

            kandi-Quality Quality

              cityhash has 0 bugs and 0 code smells.

            kandi-Security Security

              cityhash has 1 vulnerability issues reported (0 critical, 0 high, 1 medium, 0 low).
              cityhash code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              cityhash is licensed under the MIT License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              cityhash releases are not available. You will need to build from source code and install.
              Installation instructions are not available. Examples and code snippets are available.

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            Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of cityhash
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            cityhash Key Features

            No Key Features are available at this moment for cityhash.

            cityhash Examples and Code Snippets

            No Code Snippets are available at this moment for cityhash.

            Community Discussions

            QUESTION

            Multiple errors when trying to install tensorflow gpu beta 2.0 in virtual env on a windows machine using pip
            Asked 2019-Oct-15 at 17:12

            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 06:52
            1. In the newer commits for tfds - the cityhash library has been swapped with siphash.

            2. For tensorflow the tb_nightly dependency is expected to be updated mid-July so if installing after that - the issue may not even arise.

            3. Since cloudpickle versions for two packages are different need to upgrade one of them or downgrade the other.

            Source https://stackoverflow.com/questions/56636196

            QUESTION

            Missing instruction `_mm_crc32_u64` when installing clickhouse-cityhash on OSX 10.14.5
            Asked 2019-Jun-11 at 23:17

            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 22:43

            Many 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:

            Source https://stackoverflow.com/questions/56549155

            QUESTION

            Which string hashing algorithm produces 32-bit or 64-bit signed integers?
            Asked 2019-Mar-30 at 19:59

            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 12:53
            create 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
            

            Source https://stackoverflow.com/questions/45279590

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install cityhash

            You can download it from GitHub.

            Support

            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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            CLONE
          • HTTPS

            https://github.com/google/cityhash.git

          • CLI

            gh repo clone google/cityhash

          • sshUrl

            git@github.com:google/cityhash.git

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