BloomFilter | BloomFilter in python | Hashing library

 by   m00dy Python Version: Current License: No License

kandi X-RAY | BloomFilter Summary

kandi X-RAY | BloomFilter Summary

BloomFilter is a Python library typically used in Security, Hashing applications. BloomFilter has no bugs, it has no vulnerabilities and it has low support. However BloomFilter build file is not available. You can download it from GitHub.

The implementation of the project entirely was done in python. I used jenkins hash implementation as base hash function. In addition, I wrote another wrapper class for HashFunction which uses jenkins hash function as base and it takes 2 additional random parameters to differentiate each instance of the HashFunction class. I designed and implemented another BloomFilter class which takes M and K values in its constructor and use that wrapped HashFunction class to generate different K number of hash functions in the class. M is used to set the size of the Bit Vector. In its constructor, all bits in the bit vector initialized to False at first. BloomFilter class has 2 methods insert and check. Insert method takes a value as a parameter and hash the value through all K number of different hash functions. Set true to all indexes after that. However, check method basically hash the value again through hash functions and check if all set to True. If any of them set to False, it will return false otherwise True. I implemented another class Experiment which basically takes B , N , M ,K values. B is for number of iterations N is for number of items to be added M is for Bit vector size K is for number of hash functions. In this sense, by setting these parameters in Experiment class, the class itself will do the rest as following. Jenkin's hash implementation is taken from
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            kandi-support Support

              BloomFilter has a low active ecosystem.
              It has 99 star(s) with 6 fork(s). There are 7 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              BloomFilter has no issues reported. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of BloomFilter is current.

            kandi-Quality Quality

              BloomFilter has 0 bugs and 0 code smells.

            kandi-Security Security

              BloomFilter has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              BloomFilter code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              BloomFilter does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              OutlinedDot
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              BloomFilter releases are not available. You will need to build from source code and install.
              BloomFilter has no build file. You will be need to create the build yourself to build the component from source.

            Top functions reviewed by kandi - BETA

            kandi has reviewed BloomFilter and discovered the below as its top functions. This is intended to give you an instant insight into BloomFilter implemented functionality, and help decide if they suit your requirements.
            • Creates an experiment
            • Hashes little endian
            • Performs the final transformation
            • Mix two values
            • Checks the given object against the hash functions
            • Insert an object into the bit vector
            • Compute the JHash of data
            • Convert from y to hash
            • Base hash function
            • Rotate a signed integer
            • Return the percentage of the given part
            Get all kandi verified functions for this library.

            BloomFilter Key Features

            No Key Features are available at this moment for BloomFilter.

            BloomFilter Examples and Code Snippets

            No Code Snippets are available at this moment for BloomFilter.

            Community Discussions

            QUESTION

            How to link the bitcodes of PostgreSQL
            Asked 2022-Mar-22 at 08:54

            I want to run llvm-slicer (source) for PostgreSQL main executable file (i.e., PG_ROOT/src/backend/postgres) to carry backward slicing on PostgreSQL. llvm-slicer runs on top of bitcode (.bc file). I have compiled PostgreSQL via ./configure CC=clang-6.0 && make CC=clang-6.0, duiring which, the final compile command that link many .o files together is (very long):

            ...

            ANSWER

            Answered 2022-Mar-22 at 08:54

            Solution: whole-program-llvm.

            It provides tools for building whole-program (or whole-library) LLVM bitcode files from an unmodified C or C++ source package. It currently runs on *nix platforms such as Linux, FreeBSD, and Mac OS X.

            Source https://stackoverflow.com/questions/71237916

            QUESTION

            how to solve cyclic-dependency & Iterator lifetime problem?
            Asked 2022-Jan-05 at 09:43

            Rustaceans. when I start to write a BloomFilter example in rust. I found I have serveral problems have to solve. I struggle to solve them but no progress in a day. I need help, any suggestion will help me a lot, Thanks.

            Problems
            1. How to solve lifetime when pass a Iterator into another function?
            ...

            ANSWER

            Answered 2022-Jan-04 at 19:41

            pub type BitsIter = Box>;

            In this case, the object in the box must be valid for the 'static lifetime. This isn't the case for the iterator returned by hash - its limited to the lifetime of self.

            Try replacing with:

            Source https://stackoverflow.com/questions/70583528

            QUESTION

            Join dataset with case class spark scala
            Asked 2021-Nov-22 at 08:18

            I am converting a dataframe into a dataset using case class which has a sequence of another case class

            ...

            ANSWER

            Answered 2021-Nov-22 at 08:18

            You can explode your array sequence in your IpMonitor objects using explode function, then use a left outer join to match ips present in your Ips dataset, then filter out on ipType == "home" or ip is present in Ips dataset and finally rebuild your IpLocation sequence by grouping by id and collect_list.

            Complete code is as follows:

            Source https://stackoverflow.com/questions/70031208

            QUESTION

            Intersections and unions of Bloom filters in Java using the Guava library
            Asked 2021-Oct-20 at 12:10

            Bloom filters seem promising for a real-world problem I'm working on. A popular java implementation seems to be Google's guava library.

            I need to use bloom filter's union operation, and an intersection operation would be good to have, but I can work around it.

            In the java docs, I could find no method which performs intersection, while the putAll method seems to work like the union operation.

            So my questions are these:

            1. Is putAll() the correct way to get the union of two bloom filters?
            2. Is there a non-reflective way to get the intersection of two or more bloom filters?
            3. In case one is okay with reflection, can we safely perform biwise operations (or, and) on the 'data' field?

            If someone could recommend any another popular and well-tested library which is available on maven's repository,and has intersection and union, that'd also solve my needs.

            ...

            ANSWER

            Answered 2021-Oct-20 at 12:10
            1. Is putAll() the correct way to get the union of two bloom filters?

            Yes, BloomFilter#putAll(BloomFilter) JavaDoc says:

            Combines this Bloom filter with another Bloom filter by performing a bitwise OR of the underlying data. The mutations happen to this instance. Callers must ensure the Bloom filters are appropriately sized to avoid saturating them.

            The catch is that it'll throw IllegalArgumentException - if isCompatible(that) == false, so if you want to use this method you must make sure that isCompatible returns true:

            Determines whether a given Bloom filter is compatible with this Bloom filter. For two Bloom filters to be compatible, they must:

            • not be the same instance
            • have the same number of hash functions
            • have the same bit size
            • have the same strategy
            • have equal funnels

            That said, let's try to answer the second question and find an easier solution.

            1. Is there a non-reflective way to get the intersection of two or more bloom filters?

            Yes, you can use the fact that BloomFilters implement Predicate and use its .and() and .or() methods, remembering that mightContain behavior depends on BloomFilter's parameters.

            Example:

            Source https://stackoverflow.com/questions/69644359

            QUESTION

            How to Save Object of Maven Libraries Using Hibernate JPA?
            Asked 2021-Apr-22 at 07:37

            I am implementing Bloom Filter in a maven project using

            ...

            ANSWER

            Answered 2021-Apr-22 at 07:37

            I stored them as BLOB objects.

            Source https://stackoverflow.com/questions/66947439

            QUESTION

            BloomFilter to String and back
            Asked 2020-Nov-10 at 21:09

            I want to conver BloomFilter to String, store it and then get it from String. If I do it using just byte array, without converting to String - everything is ok:

            ...

            ANSWER

            Answered 2020-Nov-10 at 21:09

            Converting bytes to a String and back is not always reversible in any Charset. You must use a tool such as Base64 (provided in Guava as BaseEncoding.base64()) to convert a byte array to a string in such a way that you can always convert it back correctly.

            Source https://stackoverflow.com/questions/64776781

            QUESTION

            Why does adding a tokenbf_v2 index to my Clickhouse table not have any effect
            Asked 2020-Oct-11 at 14:40

            I have a large table in Clickhouse with one column called 'Route' which is a comma separated String of id's. It looks e.g. like this: 123421,25245,346263. There can be hundreds of id's in one string.

            The table is queried to select Routes that go through certain id's where the order matters, like this:

            ...

            ANSWER

            Answered 2020-Oct-10 at 18:06

            To guarantee to apply the index to all data need to re-insert them all. I would recommend creating the test table with the required index and partially fill it. To use it as a playground to find more optimal indexes.

            Consider to use hasToken-function or others ones allowed to tokenbf_v1-index (see Skipping index: functions support):

            Source https://stackoverflow.com/questions/64296164

            QUESTION

            Cassandra Windows 10 Access Violation
            Asked 2020-Jul-29 at 02:45

            EDIT: Although yukim's workaround does work, I found that by downgrading to JDK 8u251 vs 8u261, the sigar lib works correctly.

            • Windows 10 x64 Pro
            • Cassandra 3.11.7

            NOTE: I have JDK 11.0.7 as my main JDK, so I override JAVA_HOME and PATH in the batch file for Cassandra.

            Opened admin prompt and...

            java -version

            ...

            ANSWER

            Answered 2020-Jul-29 at 01:05

            I think it is sigar-lib that cassandra uses that is causing the problem (especially on the recent JDK8).

            It is not necessary to run cassandra, so you can comment out this line from cassandra-env.ps1 in conf directory: https://github.com/apache/cassandra/blob/cassandra-3.11.7/conf/cassandra-env.ps1#L357

            Source https://stackoverflow.com/questions/63144295

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

            Vulnerabilities

            No vulnerabilities reported

            Install BloomFilter

            You can download it from GitHub.
            You can use BloomFilter like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.

            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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