ordered-set | mutable set that remembers the order of its entries

 by   LuminosoInsight Python Version: Current License: MIT

kandi X-RAY | ordered-set Summary

kandi X-RAY | ordered-set Summary

ordered-set is a Python library typically used in Big Data, MongoDB, Spark applications. ordered-set has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has high support. You can install using 'pip install ordered-set' or download it from GitHub, PyPI.

An OrderedSet is a mutable data structure that is a hybrid of a list and a set. It remembers the order of its entries, and every entry has an index number that can be looked up.
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              ordered-set has a highly active ecosystem.
              It has 124 star(s) with 33 fork(s). There are 31 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              There are 7 open issues and 25 have been closed. On average issues are closed in 46 days. There are 4 open pull requests and 0 closed requests.
              It has a positive sentiment in the developer community.
              The latest version of ordered-set is current.

            kandi-Quality Quality

              ordered-set has 0 bugs and 0 code smells.

            kandi-Security Security

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

            kandi-License License

              ordered-set 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

              ordered-set releases are not available. You will need to build from source code and install.
              Deployable package is available in PyPI.
              Build file is available. You can build the component from source.
              Installation instructions are not available. Examples and code snippets are available.

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            ordered-set Key Features

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            ordered-set Examples and Code Snippets

            No Code Snippets are available at this moment for ordered-set.

            Community Discussions

            QUESTION

            Why is Python's set() sorting a list in some cases?
            Asked 2022-Jan-03 at 01:40

            I'm confused by the behavior of Python's set() in this example:

            ...

            ANSWER

            Answered 2022-Jan-03 at 01:40

            To actually answer your question. Many implementations of sets use an implementation similar to hashtables. Items are hashed and placed into an "array" based on that hash value.

            Notice that for small integers, hash(x) == x. So 1 will go into slot 1, 2 will go into slot 2, 3 into slot 3, etc. Then when the elements are read, you'll literally get the elements sorted.

            However if your integers are bigger than the array size, then their placement in the array will be modulo the size of the array. They will no longer be sorted.

            Again, I have not actually looked at the Python implementation. This is simply a possible explanation of what could be happening.

            Source https://stackoverflow.com/questions/70557921

            QUESTION

            Is there a data structure like a C++ std set which also quickly returns the number of elements in a range?
            Asked 2021-Oct-28 at 15:57

            In a C++ std::set (often implemented using red-black binary search trees), the elements are automatically sorted, and key lookups and deletions in arbitrary positions take time O(log n) [amortised, i.e. ignoring reallocations when the size gets too big for the current capacity].

            In a sorted C++ std::vector, lookups are also fast (actually probably a bit faster than std::set), but insertions are slow (since maintaining sortedness takes time O(n)).

            However, sorted C++ std::vectors have another property: they can find the number of elements in a range quickly (in time O(log n)).

            i.e., a sorted C++ std::vector can quickly answer: how many elements lie between given x,y?

            std::set can quickly find iterators to the start and end of the range, but gives no clue how many elements are within.

            So, is there a data structure that allows all the speed of a C++ std::set (fast lookups and deletions), but also allows fast computation of the number of elements in a given range?

            (By fast, I mean time O(log n), or maybe a polynomial in log n, or maybe even sqrt(n). Just as long as it's faster than O(n), since O(n) is almost the same as the trivial O(n log n) to search through everything).

            (If not possible, even an estimate of the number to within a fixed factor would be useful. For integers a trivial upper bound is y-x+1, but how to get a lower bound? For arbitrary objects with an ordering there's no such estimate).

            EDIT: I have just seen the related question, which essentially asks whether one can compute the number of preceding elements. (Sorry, my fault for not seeing it before). This is clearly trivially equivalent to this question (to get the number in a range, just compute the start/end elements and subtract, etc.)

            However, that question also allows the data to be computed once and then be fixed, unlike here, so that question (and the sorted vector answer) isn't actually a duplicate of this one.

            ...

            ANSWER

            Answered 2021-Oct-28 at 09:29

            All data structures have their pros and cons, the reason why the standard library offers a bunch of containers.

            And the rule is that there is often a balance between quickness of modifications and quickness of data extraction. Here you would like to easily access the number of elements in a range. A possibility in a tree based structure would be to cache in each node the number of elements of its subtree. That would add an average log(N) operations (the height of the tree) on each insertion or deletion, but would highly speedup the computation of the number of elements in a range. Unfortunately, few classes from the C++ standard library are tailored for derivation (and AFAIK std::set is not) so you will have to implement your tree from scratch.

            Source https://stackoverflow.com/questions/69751041

            QUESTION

            How does one install pytorch 1.9 in an HPC that seems to refuse to cooperate?
            Asked 2021-Sep-27 at 15:21

            I've been trying to install PyTorch 1.9 with Cuda (ideally 11) on my HPC but I cannot.

            The cluster says:

            ...

            ANSWER

            Answered 2021-Sep-23 at 06:45

            First of all, as @Francois suggested, try to uninstall the CPU only version of pytorch. Also in your installation script, you should use either conda or pip3.

            Then you may want to try the following attempts:

            • using conda: add conda-forge channel to your command (conda install pytorch torchvision torchaudio cudatoolkit=11.1 -c pytorch -c nvidia -c conda-forge). And make sure conda is updated.
            • using pip: insert --no-cache-dir into your command (pip3 --no-cache-dir install torch==1.9.0+cu111 torchvision==0.10.0+cu111 torchaudio==0.9.0 -f https://download.pytorch.org/whl/torch_stable.html) to avoid the MemoryError.

            Source https://stackoverflow.com/questions/69230502

            QUESTION

            python module not found after executing shell script even though the module is installed
            Asked 2021-Aug-20 at 18:37
            pip3 list
            Package             Version
            ------------------- ------------
            apipkg              1.5
            apparmor            3.0.3
            appdirs             1.4.4
            asn1crypto          1.4.0
            brotlipy            0.7.0
            certifi             2021.5.30
            cffi                1.14.6
            chardet             4.0.0
            cmdln               2.0.0
            configobj           5.0.6
            createrepo-c        0.17.3
            cryptography        3.3.2
            cssselect           1.1.0
            cupshelpers         1.0
            cycler              0.10.0
            decorator           5.0.9
            idna                3.2
            iniconfig           0.0.0
            isc                 2.0
            joblib              1.0.1
            kiwisolver          1.3.1
            LibAppArmor         3.0.3
            lxml                4.6.3
            matplotlib          3.4.3
            mysqlclient         2.0.3
            nftables            0.1
            notify2             0.3.1
            numpy               1.21.1
            opi                 2.1.1
            ordered-set         3.1.1
            packaging           20.9
            pandas              1.3.1
            Pillow              8.3.1
            pip                 20.2.4
            ply                 3.11
            psutil              5.8.0
            py                  1.10.0
            pyasn1              0.4.8
            pycairo             1.20.1
            pycparser           2.20
            pycups              2.0.1
            pycurl              7.43.0.6
            PyGObject           3.40.1
            pyOpenSSL           20.0.1
            pyparsing           2.4.7
            pysmbc              1.0.23
            PySocks             1.7.1
            python-dateutil     2.8.2
            python-linux-procfs 0.6
            pytz                2021.1
            pyudev              0.22.0
            requests            2.25.1
            rpm                 4.16.1.3
            scikit-learn        0.24.2
            scipy               1.7.1
            setuptools          57.4.0
            six                 1.16.0
            sklearn             0.0
            slip                0.6.5
            slip.dbus           0.6.5
            termcolor           1.1.0
            threadpoolctl       2.2.0
            torch               1.9.0+cu111
            torchaudio          0.9.0
            torchvision         0.10.0+cu111
            tqdm                4.62.1
            typing-extensions   3.10.0.0
            urllib3             1.26.6
            
            ...

            ANSWER

            Answered 2021-Aug-20 at 18:37

            It is very likely that pip3 is pointing to a different python instance.

            Imagine you had python, python3, python3.6 and python3.8 all installed on your system. Which one would pip3 install packages for? (who knows?)

            It is almost always safer to do python3.8 -m pip list/install since you can be sure that python3.8 somefile.py will be using the same files you just saw. (even better, do python3.8 -m venv /path/to/some/virtualenv and then make sure that is activated, then you can be sure pip points to the same python)

            Source https://stackoverflow.com/questions/68866686

            QUESTION

            Is iteration order of two unordered_set-s with same contents guaranteed to be the same
            Asked 2021-Aug-19 at 18:09

            If I have two unordered_set variables with same contents (if sorted), but created differently (say, first variable only had items inserted, second one had items inserted, erased, etc. in different order, but both variables ended up with same contents), will iterating over these two variables produce values in the same order?

            PS. this question is different from similar questions on iterating same unordered set twice.

            ...

            ANSWER

            Answered 2021-Aug-19 at 18:09

            The standard does not make such guarantee. The ordering is bound to be implementation-specific.

            Consider this example to see why the ordering may be different even though the content is identical: let's start with two unordered sets A and B that have been created and filled with values in the same order until a point when an addition of one more object would trigger rehashing.

            Now consider what happens when add an object to B, and then remove it, while not adding any objects to A. Obviously, the two sets would be identical, but since B went through rehashing, the order of the objects in these sets would change.

            Section 23.2.5.12 of the C++11 standard discusses the equality of unordered containers. It states that the worst-case time complexity of figuring out the equality is O(n^2). This implies that there is no guarantee of the same ordering, because otherwise we would be able to check equality in O(n).

            Source https://stackoverflow.com/questions/68851481

            QUESTION

            insert vector into unordered set after declaration c++
            Asked 2021-Jul-15 at 04:08

            I'm looking for a way to insert a vector of elements into an unordered set that I have already declared. Say I have code as follows:

            ...

            ANSWER

            Answered 2021-Jul-15 at 04:08

            QUESTION

            I cannot use opencv2 and received ImportError: libgl.so.1 cannot open shared object file no such file or directory
            Asked 2020-Nov-04 at 03:33

            **env:**ubuntu16.04 anaconda3 python3.7.8 cuda10.0 gcc5.5

            command:

            ...

            ANSWER

            Answered 2020-Nov-04 at 03:33

            I have solved this problem! Firstly,find the file:

            Source https://stackoverflow.com/questions/64664094

            QUESTION

            fatal error: cuda_runtime_api.h: No such file or directory when trying to use cuda in docker
            Asked 2020-Oct-22 at 14:06

            I am trying to build a docker image for a python script that I would like to deploy. This is the first time I am using docker so I'm probably doing something wrong but I have no clue what.

            My System:

            ...

            ANSWER

            Answered 2020-Oct-22 at 13:20

            EDIT: this answer just tells you how to verify what's happening in your docker image. Unfortunately I'm unable to figure out why it is happening.

            How to check it?

            At each step of the docker build, you can see the various layers being generated. You can use that ID to create a temporary image to check what's happening. e.g.

            Source https://stackoverflow.com/questions/64481487

            QUESTION

            Find a pointer T* in std::unordered_set (C++20)
            Asked 2020-Oct-13 at 10:53

            As pointed out in Using a std::unordered_set of std::unique_ptr, it is not easy to find a pointer T* in std::unordered_set>. Prior to C++20 we were forced to construct an instance of std::unique_ptr.

            Thanks to the Heterogeneous lookup for unordered containers proposals (http://wg21.link/P0919r3 and http://wg21.link/p1690r1), this problem is solved in C++20. But the available solution looks quite clumsy to me (even by C++ standards). It seems like I need to implement from scratch not one, but two functors (for transparent hashing and for transparent comparison):

            ...

            ANSWER

            Answered 2020-Oct-13 at 10:53

            You can shift the verbosity into std::to_address (thanks to @Caleth for pointing that out) and the existing std::hash, which is specialized for std::unique_ptr to return a hash based on the raw address (thanks to @Mikhail for the hint). Then, implement hash and equality types with member function templates (note how you no longer need the types themselves be templates):

            Source https://stackoverflow.com/questions/64243246

            QUESTION

            Can't use lambda as hash for unordered_set of pairs?
            Asked 2020-Sep-26 at 05:06

            I am trying to define a type that's an unordered_set over pairs of unsigned int:

            ...

            ANSWER

            Answered 2020-Sep-26 at 05:06

            You need to compile with C++20 mode, i.e. with the option -std=c++2a.

            Before C++20 lambda closure types have no default constructor.

            Closure types are not DefaultConstructible. Closure types have no default constructor (until C++20)

            If no captures are specified, the closure type has a defaulted default constructor. (since C++20)

            Source https://stackoverflow.com/questions/64074068

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

            Vulnerabilities

            No vulnerabilities reported

            Install ordered-set

            You can install using 'pip install ordered-set' or download it from GitHub, PyPI.
            You can use ordered-set 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.

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