nd4j | Fast , Scientific and Numerical Computing for the JVM | GPU library

 by   deeplearning4j Java Version: Current License: Apache-2.0

kandi X-RAY | nd4j Summary

kandi X-RAY | nd4j Summary

nd4j is a Java library typically used in Institutions, Learning, Education, Hardware, GPU applications. nd4j has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has high support. You can download it from GitHub, Maven.

ND4J: Scientific Computing on the JVM.
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              nd4j has a highly active ecosystem.
              It has 1767 star(s) with 545 fork(s). There are 149 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              There are 192 open issues and 1113 have been closed. On average issues are closed in 90 days. There are 6 open pull requests and 0 closed requests.
              It has a positive sentiment in the developer community.
              The latest version of nd4j is current.

            kandi-Quality Quality

              nd4j has no bugs reported.

            kandi-Security Security

              nd4j has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

            kandi-License License

              nd4j is licensed under the Apache-2.0 License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              nd4j releases are not available. You will need to build from source code and install.
              Deployable package is available in Maven.
              Build file is available. You can build the component from source.
              Installation instructions are not available. Examples and code snippets are available.

            Top functions reviewed by kandi - BETA

            kandi has reviewed nd4j and discovered the below as its top functions. This is intended to give you an instant insight into nd4j implemented functionality, and help decide if they suit your requirements.
            • To double array .
            • Returns entropy of two doubles .
            • Gets the method with the specified name and parameter types .
            • Merges an object into the given collection .
            • Performs an accumulator .
            • insert an array of points
            • Import variables .
            • Check given a custom operation .
            • Translate a character .
            • Returns zeta .
            Get all kandi verified functions for this library.

            nd4j Key Features

            No Key Features are available at this moment for nd4j.

            nd4j Examples and Code Snippets

            No Code Snippets are available at this moment for nd4j.

            Community Discussions

            QUESTION

            Could not initialize class org.nd4j.linalg.factory.Nd4j in docker container
            Asked 2022-Feb-09 at 11:28

            I am trying to import a KERAS file in a docker container with a program that has the following java code sample:

            ...

            ANSWER

            Answered 2022-Jan-11 at 11:59

            This still doesn't show a cause. NoClassDeffFoundErrors are usually related to a clashing dependencies. You could have different versions of dl4j/nd4j on your classpath but I doubt it. Most of the time this is the side effect of a native dependency crash somehow.

            Of note here:

            I wouldn't recommend running the keras converter (or any model import process) in line. I would recommend converting the models separately. This is mainly for performance reasons

            Whatever your problem is there are usually a few:

            1. glibc version with hdf5. Keras import uses hdf5 underneath the covers which means c code.

            2. Nd4j native dependency crash: this is also usually glibc related. We load nd4j in to memory to create and set native arrays (which means more java calling in to c++) that then can trigger a crash depending on what OS you're running on

            3. Another hdf5 error: this could be an invalid model or some hdf5 version error.

            In any case, we would need more information before we can help you. Whatever you're reporting here isn't enough. Could you mention your docker container OS and what version of dl4j/nd4j is bundled here?

            Edit: I see it's oracle linux 7 which is effectively RHEL/Centos. If you're using docker I would recommend a newer image maybe.

            Beyond that if it is an nd4j related crash (still not verifiable from your stack trace) if you are using the latest version you might be seeing a crash due to glibc version.

            If so there was a recent update to the nd4j classifiers you can find here: https://repo1.maven.org/maven2/org/nd4j/nd4j-native/1.0.0-M1.1/

            Older glibcs need to use linux-x86_64-compat as a migration path

            Source https://stackoverflow.com/questions/70666185

            QUESTION

            Problems building using gradle with nd4j
            Asked 2022-Feb-02 at 22:49

            I'm trying to build a module using nd4j.
            It builds fine with maven but not with gradle.
            I did an auto-conversion of the pom, I added the javacpp dependency by hand and
            it builds but the tests fail with link error no jniopenblas_nolapack in java.library.path.
            I've done a lot of net-searching to no avail.
            This is my dependencies section:

            ...

            ANSWER

            Answered 2022-Feb-02 at 22:49

            in the comments I would appreciate comments on our docs to help improve the site. We cover this scenario explicitly. I'll summarize it below then comment with a link. If you see anything missing please do help us improve the website for the future.

            Nd4j uses javacpp which relies on classifiers to determine how to include native binaries. The way it works is the core classes are put in a standalone library/artifactId (nd4j-native) and it needs an accompanying classifier dependency to go with it. This will be an artifact id with the same name and version plus an additional classifier. This will usually be the OS and architecture name for your platform. This could be linux-x86_64 (linux on 64 bit intel) or android-arm64 (android on 64 bit ARM devices)

            These also usually have accompanying dependencies such as openblas (which we also use the javacpp bindings for) to enable us to access fast 3rd party math routines.

            With that in mind a dependency block like this is usually what you're looking for:

            Source https://stackoverflow.com/questions/70958433

            QUESTION

            The XOR neural network written in DL4J does not work
            Asked 2022-Jan-20 at 09:40

            I'm starting to study the neural network together with the DL4j framework and start with XOR training. But no matter what I do, I get the wrong results.

            ...

            ANSWER

            Answered 2022-Jan-20 at 09:40

            That looks like an old example. Where did you get it from? Note that the project does not endorse or support random examples people pull from. If this is from the book, please note those examples are a few years old at this point and should not be used.

            This should be the latest one: https://github.com/eclipse/deeplearning4j-examples/blob/master/dl4j-examples/src/main/java/org/deeplearning4j/examples/quickstart/modeling/feedforward/classification/ModelXOR.java

            This configuration suffers from what I like to call the "toy problem syndrome". Dl4j assumes minibatches by default and therefore clips the learning by default relative to the minibatch size of the input examples. This is how 99% of problems are setup if you do anything in the real world.

            This means that each step the net takes is actually not the full step it would take if you do a toy problem with the whole set in memory. Our latest example handles this by turning minibatch off for this:

            Source https://stackoverflow.com/questions/70783590

            QUESTION

            Deeplearning4J nd4j-native.properties cannot be opened because it does not exist
            Asked 2021-Nov-15 at 07:07

            When I used DL4J(version 1.0.0-M1.1) on android studio, it says that "nd4j-native.properties cannot be opened because it does not exist".However if I used on IDEA or the version was 1.0.0-beta7, the error did not occurred.

            ...

            ANSWER

            Answered 2021-Nov-15 at 03:27

            Could you clarify a bit about what you are running in to? Your build.gradle would be nice to see. It's kind of hard to tell what you might be running in to.

            The only thing I can tell you is that there are certain properties files that are used by the framework that should be bundled in the jars.

            Typically when this happens, that means that whatever is bundling the jar didn't include that resource.

            Thanks!

            Source https://stackoverflow.com/questions/69968900

            QUESTION

            DL4J-Image become too bright
            Asked 2021-Oct-14 at 08:21

            Currently, I've been asked to write CNN code using DL4J using YOLOv2 architecture. But the problem is after the model has complete, I do a simple GUI for validation testing then the image shown is too bright and sometimes the image can be displayed. Im not sure where does this problem comes from whether at earliest stage of training or else. Here, I attach the code that I have for now. For Iterator:

            ...

            ANSWER

            Answered 2021-Oct-14 at 08:01

            CanvasFrame tries to do gamma correction by default because it's typically needed by cameras used for CV, but cheap webcams usually output gamma corrected images, so make sure to let CanvasFrame know about it this way:

            Source https://stackoverflow.com/questions/69566911

            QUESTION

            Deeplearning4j - how to iterate multiple DataSets for large data?
            Asked 2021-Sep-22 at 10:48

            I'm studying Deeplearning4j (ver. 1.0.0-M1.1) for building neural networks.

            I use IrisClassifier from Deeplearning4j as an example, it works fine:

            ...

            ANSWER

            Answered 2021-Sep-22 at 10:48

            Firstly, always use Nd4j.create(..) for ndarrays. Never use the implementation. That allows you to safely create ndarrays that will work whether you use cpus or gpus.

            2nd: Always use the RecordReaderDataSetIterator's builder rather than the constructor. It's very long and error prone.

            That is why we made the builder in the first place.

            Your NullPointer actually isn't coming from where you think it is. it's due to how you're creating the ndarray. There's no data type or anything so it can't know what to expect. Nd4j.create(..) will properly setup the ndarray for you.

            Beyond that you are doing things the right way. The record reader handles the batching for you.

            Source https://stackoverflow.com/questions/69281007

            QUESTION

            Maven: NDJ4 Has Backend, Error Says It Doesn't
            Asked 2021-Aug-20 at 18:11

            thanks for your time today.

            I'm getting an error for missing logger backend but I have log4j installed. I've listed the relevant errors and pom dependecies below:

            pom.xml segments:

            ...

            ANSWER

            Answered 2021-Aug-20 at 18:11

            Well, I couldn't work out how to make log4j function. I tried what was suggested in the comments, such as including slf4j-log4j12, or nd4j-x86.

            Sometimes the best way to solve a problem is to remove it instead: I stopped trying to get log4j to function and went with nd4j-native.

            Source https://stackoverflow.com/questions/68805581

            QUESTION

            org.nd4j.linalg.factory.Nd4j.zeros(long, long)
            Asked 2021-Jul-08 at 14:52

            Trying to use io.github.ensozos.core.MPdistance.getMPdistance using Maven, I get the following error:

            ...

            ANSWER

            Answered 2021-Jul-08 at 13:28

            I ran mvn dependency:tree on your project and it turns out there were older versions being pulled in:

            Source https://stackoverflow.com/questions/68301619

            QUESTION

            Proper use of generics in abstract java class?
            Asked 2021-May-17 at 13:39

            EDIT: This question is not well worded, and the provided answer is correct in a literal sense but did not teach me how to attain what I needed. If you are struggling with the same problem, this is what finally helped me: How to enforce child class behavior/methods when the return types of these methods depends on the child class?

            I am trying to implement a basic matrix class from a boilerplate abstract class I wrote. There will be several implementations of this abstract class, each one using a different math library, which I will then test for speed.

            Each implementation will hold its data in that library's native matrix data structure. I think this is a use case for generics. At this point I think I've read too many tutorials and watched too many videos, as I just can't seem to figure out all the right places to put the T Notation to make this work correctly.

            So my question is twofold:

            1. Have I misused or missed the point of generics?
            2. If not, what is the correct syntax for their use?

            I've read the docs plus about three different tutorials and still can't understand.

            Here is what I've tried:

            ...

            ANSWER

            Answered 2021-May-15 at 02:00

            hold its data in that library's native matrix data structure. I think this is a use case for generics.

            Generics serves to link things. You declared the type variable with , and you've used it in, as far as your paste goes, exactly one place (a field, of type T). That's a red flag; generally, given that it links things, if you use it in only one place that's usually a bad sign.

            Here's what I mean: Imagine you want to write a method that says: This method takes 2 parameters and returns something. This code doesn't particularly care what you toss in here, but, the parameters must be the same type and I return something of that type too. You want to link the type of the parameter, the type of the other parameter, and the return type together.

            That is what generics is for.

            It may apply here, if we twist our minds a bit: You want to link the type of the data field to a notion that some specific implementation of BaseMatrix can only operate on some specific type, e.g. ND4JMatrix.

            However, mostly, no, this doesn't strike me as proper use of generics. You can avoid it altogether quite easily: Just.. stop having that private T data; field. What good is it doing you here? You have no idea what type that is, you don't even know if it is serializable. You know nothing about it, and the compiler confirms this: There is absolutely not one iota you can do with that object, except things you can do to all objects which are generally quite uninteresting. You can call .toString() on it, synchronize on it, maybe invoke .hashCode(), that's about it.

            Why not just ditch that field? The implementation can make the field, no need for it to be in base!

            Source https://stackoverflow.com/questions/67541507

            QUESTION

            How to enforce child class behavior/methods when the return types of these methods depends on the child class?
            Asked 2021-May-17 at 13:37
            What I want to achieve:

            I am trying to write an abstract class that is a blueprint for the types of data and behaviors that all of its children should have. However, the return types of these enforced methods will depend on the child class itself.

            My attempt:

            I have been informed in the comments to one of my many closed questions that what I am doing here is overloading my parents methods instead of overriding them. I understand this is because I changed the method signature, and @Override requires that the signature be identical, but the implementation can be different.

            ...

            ANSWER

            Answered 2021-May-17 at 13:24

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

            Vulnerabilities

            No vulnerabilities reported

            Install nd4j

            You can download it from GitHub, Maven.
            You can use nd4j like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the nd4j component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .

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            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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