lsh | locality sensitive hashing | Learning library

 by   gamboviol Python Version: Current License: No License

kandi X-RAY | lsh Summary

kandi X-RAY | lsh Summary

lsh is a Python library typically used in Tutorial, Learning, Example Codes applications. lsh has no bugs, it has no vulnerabilities and it has high support. However lsh build file is not available. You can download it from GitHub.

lsh is an indexing technique that makes it possible to search efficiently for nearest neighbours amongst large collections of items, where each item is represented by a vector of some fixed dimension. the algorithm is approximate but offers probabilistic guarantees i.e. with the right parameter settings the results will rarely differ from doing a brute force search over your whole collection. the search time will certainly be different though: lsh is useful because the complexity of lookups becomes sublinear in the size of the collection. in principle the algorithm is quite simple, but when i was getting to grips with it i couldn’t find any straightforward implementations just to see how it worked - so i wrote this one myself. it’s not intended for use in production, but, depending on your requirements, you shouldn’t find it too hard to adapt it for production once you understand how it works. the idea of lsh is to come up with a hashing scheme that maps closely neighbouring items to the same bin, hence the "locality sensitive" part of its name. the starting point is to pick a family of simple hash functions. each member of this family is initialised with a different randomly chosen
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            kandi-support Support

              lsh has a highly active ecosystem.
              It has 62 star(s) with 22 fork(s). There are 3 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              lsh has no issues reported. There are no pull requests.
              It has a positive sentiment in the developer community.
              The latest version of lsh is current.

            kandi-Quality Quality

              lsh has no bugs reported.

            kandi-Security Security

              lsh has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

            kandi-License License

              lsh 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

              lsh releases are not available. You will need to build from source code and install.
              lsh 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 lsh and discovered the below as its top functions. This is intended to give you an instant insight into lsh implemented functionality, and help decide if they suit your requirements.
            • Run linear search .
            • Query the given metric .
            • Combine hashes .
            • Create a CosineHash function
            • Cosine between two vectors .
            • Generate a random partition .
            • Compute the dot product of two vectors .
            • L1 norm .
            • Initialize the polynomial .
            • L2 norm .
            Get all kandi verified functions for this library.

            lsh Key Features

            No Key Features are available at this moment for lsh.

            lsh Examples and Code Snippets

            No Code Snippets are available at this moment for lsh.

            Community Discussions

            QUESTION

            How to activate signals when required
            Asked 2021-Jun-11 at 15:38

            In this minimal reproducible example, I have a comboBox and a pushButton. I am trying to activate buttons on the basis of current text selected from the comboBox, but I can't able activate buttons when I tried to verify it first inside if elif else condition, how to activate right function on the basis of current text.

            ...

            ANSWER

            Answered 2021-Jun-11 at 15:38

            Your logic is wrong since you seem to think that connecting the signal to another function will disconnect the signal from the previous function.

            The solution is to invoke the appropriate function using the currentText of the QComboBox when the button is pressed.

            Source https://stackoverflow.com/questions/67939607

            QUESTION

            PyQt5 clicked button created in loop
            Asked 2021-Apr-12 at 12:14

            im trying to make calculator in pyqt5 and I cannot correctly pass numbers to function when button is clicked. This is my code:

            ...

            ANSWER

            Answered 2021-Apr-12 at 12:14

            Your lambda is executed at some time after your loop has run completely. This means that the lambda will always be executed with the last object of the for loop.

            To prevent this from happening, you can use a closure. Python has a simple way to create closures: Instead of a lambda use functools.partial

            Source https://stackoverflow.com/questions/67057972

            QUESTION

            iterating over infinite page scrolls
            Asked 2021-Jan-08 at 02:23

            im scraping data from this website https://www.heiminfo.ch/institutionen, my code below

            ...

            ANSWER

            Answered 2021-Jan-08 at 02:23

            You could do the following to get the first 100 or so elements.

            Source https://stackoverflow.com/questions/65621210

            QUESTION

            Redirecting stderr in C
            Asked 2020-Dec-03 at 16:11

            I'm writing a simple shell in C and encountered a minor problem. I have the following function:

            ...

            ANSWER

            Answered 2020-Dec-03 at 16:11

            QUESTION

            Generate uniform random number in range of floats in bash
            Asked 2020-Dec-02 at 15:52
            [SOLVED]

            I want to generate a uniform random float number in the range of float numbers in the bash script. range e.g. [3.556,6.563]

            basically, I am creating LSH(Latin hypercube sampling) function in bash. There I would like to generate an array as one can do with this python command line.

            p = np.random.uniform(low=l_lim, high=u_lim, size=[n]).

            sample code :

            ...

            ANSWER

            Answered 2020-Dec-02 at 15:52

            Most common rand() implementations at least generate a number in the range [0...1), which is really all you need. You can scale a random number in one range to a number in another using the techniques outlined in the answers to this question, eg:

            NewValue = (((OldValue - OldMin) * (NewMax - NewMin)) / (OldMax - OldMin)) + NewMin

            For bash you have two choices: integer arithmetic or use a different tool.

            Some of your choices for tools that support float arithmetic from the command-line include:

            • a different shell (eg, zsh)
            • perl: my $x = $minimum + rand($maximum - $minimum);
            • ruby: x = min + rand * (max-min)
            • awk: awk -v min=3 -v max=17 'BEGIN{srand(); print min+rand()*int(1000*(max-min)+1)/1000}'
              note: The original answer this was copied from is broken; the above is a slight modification to help correct the problem.
            • bc: printf '%s\n' $(echo "scale=8; $RANDOM/32768" | bc )

            ... to name a few.

            Source https://stackoverflow.com/questions/64790246

            QUESTION

            apply function in pandas
            Asked 2020-Oct-27 at 14:28

            When i run the following

            ...

            ANSWER

            Answered 2020-Oct-27 at 14:28

            Just drop the last map at the end. The function is returning a list and your last map function is trying to take the first element of a list.

            Source https://stackoverflow.com/questions/64556409

            QUESTION

            How to set dynamically value from a google spread sheet to another google spread sheet cell
            Asked 2020-Sep-22 at 14:19

            I'm trying to get constract date from handover report google spread sheet,

            //here's sample handover report sheet https://docs.google.com/spreadsheets/d/1gVnj2LV60hBXmuiTDa287cNoN1VzroPJEPXl3w-SBF0/edit?usp=sharing

            Then, I wanna set the value to cell that match with row including handover report ss id and column including "constract date" text.

            //here's sample List sheet https://docs.google.com/spreadsheets/d/1Hu8dTsuH5iS9P0JGBlyN6pOWHo1hhe2t03Wih2BDRGw/edit?usp=sharing

            But, nothing happen:( As you see, important to keep row&culumn dynamic for flexibility and expandability.

            I sincerely appreciate the help.

            ...

            ANSWER

            Answered 2020-Sep-22 at 14:19
            The problem is the way you write your functions

            You define all functions inside of contractDate(), but you never call them and never assign them parameters.

            Also:

            Your return 0; statement should be placed after the for loop - otherwise after the first iteration 0 will be returned if the if condition is not fullfilled. Returning means that the function will halted before the iteration is complete.

            Working sample:

            Source https://stackoverflow.com/questions/63996215

            QUESTION

            Why does textreuse packge in R make LSH buckets way larger than the original minhashes?
            Asked 2020-Aug-16 at 20:24

            As far as I understand one of the main functions of the LSH method is data reduction even beyond the underlying hashes (often minhashes). I have been using the textreuse package in R, and I am surprised by the size of the data it generates. textreuse is a peer-reviewed ROpenSci package, so I assume it does its job correctly, but my question persists.

            Let's say I use 256 permutations and 64 bands for my minhash and LSH functions respectively -- realistic values that are often used to detect with relative certainty (~98%) similarities as low as 50%.

            If I hash a random text file using TextReuseTextDocument (256 perms) and assign it to trtd, I will have:

            ...

            ANSWER

            Answered 2020-Aug-16 at 20:24

            Package author here. Yes, it would be wasteful to use more hashes/bands than you need. (Though keep in mind we are talking about kilobytes here, which could be much smaller than the original documents.)

            The question is, what do you need? If you need to find only matches that are close to identical (i.e., with a Jaccard score close to 1.0), then you don't need a particularly sensitive search. If, however, you need to reliable detect potential matches that only share a partial overlap (i.e., with a Jaccard score that is closer to 0), then you need more hashes/bands.

            Since you've read MMD, you can look up the equation there. But there are two functions in the package, documented here, which can help you calculate how many hashes/bands you need. lsh_threshold() will calculate the threshold Jaccard score that will be detected; while lsh_probability() will tell you how likely it is that a pair of documents with a given Jaccard score will be detected. Play around with those two functions until you get the number of hashes/bands that is optimal for your search problem.

            Source https://stackoverflow.com/questions/63428482

            QUESTION

            Reformer local and LSH attention in HuggingFace implementation
            Asked 2020-May-21 at 23:47

            The recent implementation of the Reformer in HuggingFace has both what they call LSH Self Attention and Local Self Attention, but the difference is not very clear to me after reading the documentation. Both use bucketing to avoid the quadratic memory requirement of vanilla transformers, but it is not clear how they differ.

            Is it the case that local self attention only allows queries to attend to keys sequentially near them (i.e., inside a given window in the sentence), as opposed to the proper LSH hashing that LSH self attention does? Or is it something else?

            ...

            ANSWER

            Answered 2020-May-21 at 23:47

            After closely examining the source code, I found that indeed the Local Self Attention attends to the sequentially near tokens.

            Source https://stackoverflow.com/questions/61667186

            QUESTION

            How to use if2/3 in Gekko
            Asked 2020-May-21 at 01:34

            The problem I am optimizing is the building of power plants in a transmission network. To do this I'm placing power plants at every bus and let the optimization tell me which ones should be build to minimize running cost.

            To model the placing of the plant I tried using an array of binary variables that would flag i.e. be one if the plant is used at all and 0 otherwise. Then in the Objective function to minimize I multiply this array by a constant: USEW.

            I have made several attempt without any working. The one that seemed to work was using the if2 Gekko function directly in the Obj. func. However I'm getting really odd results. My code is a bit long so I'll post just the relevant lines hopefully the idea would be clear, if not please let me know and I post the whole thing.

            ...

            ANSWER

            Answered 2020-May-20 at 12:01

            One thing that you can try is to use a switch point that is 1e-3 (or a certain minimum used) instead of zero. When the switch point is at zero and the condition is 1e-10 then the output will be 1 because it is greater than the switch point. This is needed because Gekko uses gradient based optimizers that have a solution tolerance of 1e-6 (default) so a solution within that tolerance is acceptable.

            There are a couple examples in the documentation that may also help. You may also want to look at the sign2/sign3 functions and the max2/max3 functions that may also give you the desired result.

            if2 Documentation

            IF conditional with complementarity constraint switch variable. The traditional method for IF statements is not continuously differentiable and can cause a gradient-based optimizer to fail to converge. The if2 method uses a binary switching variable to determine whether y=x1 (when condition<0) or y=x2 (when condition>=0):

            if3 Documentation

            IF conditional with a binary switch variable. The traditional method for IF statements is not continuously differentiable and can cause a gradient-based optimizer to fail to converge. The if3 method uses a binary switching variable to determine whether y=x1 (when condition<0) or y=x2 (when condition>=0).

            Usage

            y = m.if3(condition,x1,x2)

            Inputs:

            • condition: GEKKO variable, parameter, or expression
            • x1 and x2: GEKKO variable, parameter, or expression

            Output:

            • y = x1 when condition<0
            • y = x2 when condition>=0

            Source https://stackoverflow.com/questions/61897213

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

            Vulnerabilities

            No vulnerabilities reported

            Install lsh

            You can download it from GitHub.
            You can use lsh 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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