CRF | Java implementation of Conditional Random Fields | Machine Learning library

 by   witgo Java Version: Current License: Non-SPDX

kandi X-RAY | CRF Summary

kandi X-RAY | CRF Summary

CRF is a Java library typically used in Artificial Intelligence, Machine Learning applications. CRF has no bugs, it has no vulnerabilities and it has low support. However CRF build file is not available and it has a Non-SPDX License. You can download it from GitHub.

You will need jdk1.4 or above and ant to compile. Make sure to set the classpath by running "" after setting CRF_HOME to the directory where you have unpackaged this distribution. A sample dataset for the segmentation problem is available under samples Run it as. "java iitb.Segment.Segment train -f samples/us50.conf" "java iitb.Segment.Segment test -f samples/us50.conf" "java iitb.Segment.Segment calc -f samples/us50.conf" (report performance statistics). or all together with. "java iitb.Segment.Segment all -f samples/us50.conf".

            kandi-support Support

              CRF has a low active ecosystem.
              It has 29 star(s) with 21 fork(s). There are 4 watchers for this library.
              It had no major release in the last 6 months.
              There are 4 open issues and 0 have been closed. On average issues are closed in 1199 days. There are 1 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of CRF is current.

            kandi-Quality Quality

              CRF has 0 bugs and 0 code smells.

            kandi-Security Security

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

            kandi-License License

              CRF has a Non-SPDX License.
              Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

            kandi-Reuse Reuse

              CRF releases are not available. You will need to build from source code and install.
              CRF has no build file. You will be need to create the build yourself to build the component from source.
              CRF saves you 17568 person hours of effort in developing the same functionality from scratch.
              It has 34826 lines of code, 1619 functions and 264 files.
              It has medium code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed CRF and discovered the below as its top functions. This is intended to give you an instant insight into CRF implemented functionality, and help decide if they suit your requirements.
            • Trains the solver
            • Get the correct solution
            • Updates the weights of the solver
            • Checks to see if the solution is correct
            • Compute marginals
            • Compute the beta array for the given data sequence
            • Performs viterbi search
            • Allocate a scratch matrix
            • Performs the actual training of the model
            • Calculates the expF values using the internal data structures
            • Start scan features at the specified position
            • Prints a nested model
            • Adds the next feature to the iterator
            • Calculates the beta coefficient
            • Add training record
            • Calculates the sum product of the beta matrix
            • Generate the fill array
            • Initializes the builder
            • Fills the start and end states
            • Computes the sum product of the data
            • Computes the sum product of all features
            • Compute marginal marginals
            • Compute the sum product product function
            • Run the optimizer
            • This method is used to perform actual math
            • Get next feature
            Get all kandi verified functions for this library.

            CRF Key Features

            No Key Features are available at this moment for CRF.

            CRF Examples and Code Snippets

            No Code Snippets are available at this moment for CRF.

            Community Discussions


            ffmpeg mjpeg -> h.265 smeared color on output video file
            Asked 2022-Mar-11 at 02:15

            I am converting some old mjpeg videos (stored in .avi container) to h.265 (.mp4 container) but am noticing the colors are smearing. Using the terminal command:

            ffmpeg -y -i "input-file.avi" -c:v libx265 -vtag hvc1 "output-file.mp4"

            I get the following image (notice how the red and blue are stretched donward). There is a lot of motion in the scene, but the motion is mostly horizontal:

            Any idea what might cause this? The detail and resolution seem fine, just the colors are being interpreted weirdly.

            Full output:



            Answered 2022-Mar-10 at 18:58

            Your file seems to be missing some color information:



            FFmpeg MOV to MP4, do I also need .OGG , .WEBM files too?
            Asked 2022-Mar-03 at 01:09

            I am new to FFmpeg and I'm just getting started. I have the two following commands to take a .mov upload and downsize it and save it out as an .mp4. I also produce a thumbnail version of the same.

            What I am doing here seems to work well and I manage to get the .mov file from 12.5mb to about a 1mb .mp4.

            My question from here is, can I get away with only providing a .mp4 for the source video, or do I need to provide additional .ogg and/or .webm files too? An if so, how is that best achieved? Would I have to loop that FFmpeg command again to output new .ogg and .webm files?

            exec("ffmpeg -i -ss 00 -to 60 -vf scale=700:-1 -crf 30 -an -movflags +faststart output.mp4");

            exec("ffmpeg -i -ss 00 -to 10 -vf 'scale=128:128:force_original_aspect_ratio=increase, crop=128:128' -crf 30 -an tn_output.mp4");



            Answered 2022-Mar-03 at 01:09

            can I get away with only providing a .mp4 for the source video, or do I need to provide additional .ogg and/or .webm files too?

            I'm not that well-versed in webdev, but you'd like to have your content to have multiple sources for browser compatibility. IIRC, Chromium does not natively support mp4, for example.

            An if so, how is that best achieved? Would I have to loop that FFmpeg command again to output new .ogg and .webm files?

            FFmpeg can produce multiple video files at once from one source:



            Cypress error when testing nested iframes in headless mode - race condition
            Asked 2022-Mar-01 at 07:08

            I am testing a web app and the test runs reliably in headed mode (cypress open) but has errors in headless mode (cypress run), so it's likely a race condition that I cannot resolve. The error message is:

            [36819:0223/] SetApplicationIsDaemon: Error Domain=NSOSStatusErrorDomain Code=-50 "paramErr: error in user parameter list" (-50)

            This error is mentioned again when Cypress creates a video of the incident:



            Answered 2022-Mar-01 at 07:08

            I got some feedback that the above "" is not critical and does not cause flaky or unsuccessful tests, therefore there are no action points.



            Make total video duration instantly known in video player (ffmpeg / html)
            Asked 2022-Feb-19 at 15:34

            What's the correct ffmpeg setting to prevent the video from 'lazy' loading the video's total duration?


            I'm trying to transcode a video using ffmpeg (in NodeJS). When transcoding is finished ffmpeg uploads the video automatically to a bucket (GCP).

            Hoverever, the video that ffmpeg produces doesn't have a clear total duration when played in a HTML video player. It's only after x (milli)seconds that the total video duration is known and displayed.


            Using the fluent-ffmpeg NodeJS library:



            Answered 2022-Feb-19 at 15:32

            After some additional testing I found out that the .writeToStream(...) is causing this behavior. This saving technique is used to directly stream the result to some url without having to save it on the machine's local disk.

            I'm now using the .save("./output/path.mp4") function to save ffmpeg's result on disk first, afterwards I stream it to my bucket (not included in code below).

            I'm not sure why this works... I think it has something to do with ffmpeg now being able to jump back and change previous saved metadata, before delivering the final video (something that wasn't possible with the .writeToStream(...) since the data stream is one continuous stream of data without the ability to jump back).

            If you're using the CLI ffmpeg version instead of fluent-ffmpeg this change would correspond to not using the pipe:1 at the end of your ffmpeg command.

            This is the final solution



            How to use multiple between statements with the blend filter in ffmpeg
            Asked 2022-Feb-15 at 05:55

            The command below blends input2 into input1 using a binary of *if expressions featuring the between statement's t variable. As such, output = input1, but with input2 at 00:00:03- 00:00:05:

            ffmpeg -y -i input1.mkv -i input2.mkv -filter_complex "[1:v][0:v]scale2ref[v1][v0];[v0][v1]blend=all_expr='A*if(between(T, 3, 5), 0, 1)+B*if(between(T, 3, 5), 1, 0)'" -vcodec libx264 -pix_fmt yuv444p -crf 18 -acodec copy output.mkv

            My question is how these can be chained together in the case of a set of evaluated conditions. I've attempted the + operator, below, but input1 is no longer the same. It seems distorted by multiple layers of the video.

            ffmpeg -y -i input1.mkv -i input2.mkv -filter_complex "[1:v][0:v]scale2ref[v1][v0];[v0][v1]blend=all_expr='A*if(between(T, 3, 5), 0, 1)+B*if(between(T, 3, 5), 1, 0)'+'A*if(between(T, 7, 9), 0, 1)+B*if(between(T, 7, 9), 1, 0)'" -vcodec libx264 -pix_fmt yuv444p -crf 18 -acodec copy output.mkv

            How can these be chained together without producing visual artifacts?

            This question is a follow-up to Rotem's solution to my earlier question.



            Answered 2022-Feb-14 at 21:35

            In case you want only [v1] between [3, 5] and between [7, 9], and [v0] otherwise, make sure that B is multiplied by 1 between {[3, 5], [7, 9]} and A is multiplied by 0 between {[3, 5], [7, 9]}, and vice versa.

            We may use the following command:



            json dynamic node parse in C#
            Asked 2022-Feb-10 at 10:38

            I am receiving json with dynamic one node based on sector like "DEL-BOM", "NYC-BOM". trying to parse but body getting null. I just add Dictionary and key as node and class as value but still not getting values in DeserializeObject.



            Answered 2022-Feb-10 at 10:38

            try this, it was tested and working properly



            FFmpeg - Converting AVI to MP4 (no audio in QuickTime player)
            Asked 2022-Feb-07 at 13:59

            I converted an avi file to a mp4 file with the following command, but the converted mp4 file produced no audio when played with QuickTime (no such problem with other players). I was able to convert mkv to mp4 with the same command without the audio problem.



            Answered 2022-Feb-06 at 19:04

            From your log I can see that your input audio is MP3.



            JQ: Extract value of a particular Key using pattern
            Asked 2022-Feb-06 at 20:24
            • In the following json:


            Answered 2022-Feb-06 at 20:24

            You need to put quotes around both the field name (as it contains the @ character), and around the query string (as it is a string):



            How to use RandomizedSearchCV on a nested list consisting of one list?
            Asked 2022-Feb-02 at 15:50

            I have built a Sentence Boundary Detection Classifier. For the sequence labeling I used a conditional random field. For the hyperparameter optimization I would like to use RandomizedSearchCV. My training data consists of 6 annotated texts. I merge all 6 texts to a tokenlist. For the implementation I followed an example from the documentation. Here my simplified code:



            Answered 2022-Jan-31 at 13:33

            According to the official tutorial here, your train/test sets (i.e., X_train, X_test) should be a list of lists of dictionaries. For example:



            The Video File Recorded by OBS Cannot Be Played by "Movie & TV" App
            Asked 2022-Jan-26 at 09:36

            The OBS's Recording settings in Output are:

            1. Type: Standard
            2. Recording Format: mkv
            3. Encoder: NVIDIA NVENC H.264(new)
            4. Rate Control: Lossless
            5. Keyframe Interval: 0
            6. Preset: Max Quality
            7. Profile: high [Look-ahead and Psycho Visual Tuning are checked]
            8. GPU: 0
            9. Max B-Frame: 4

            The OBS's Video settings in Advanced are:

            1. Renderer: Direct3D 11
            2. Color Format: I444
            3. Color Space: 709
            4. Color Range: Full

            Using the settings, OBS can record Windows Desktop in very high quality. However, the MKV file cannot be played by "Movie & TV" app or DivX Player.

            OBS will remux the MKV file to MP4, the MP4 file cannot be played by "Movie & TV" app or DivX Pro either. But the MP4 file can be played by Chrome or Edge browser. MKV and MP4 are just containers to store video data, so I think the real problem should be in video data.

            How can I record lossless video of Windows Desktop with OBS?

            P.S. I have tried to use x264 with CRF 0 to record lossless video, but get the same result.



            Answered 2021-Nov-20 at 22:06

            Your problem is exactly that you try encoding lossless H.264 video, or more correct your problem is decoding it. And lossless H.264 can be only encoded in "High 4:4:4 Predictive" profile while most of hardware H.264 decoders support only "High" profile (4:2:0) at max. Also not all software H.264 decoders support such profiles so I would recommend you to install LAVFilters which is based on ffmpeg and support almost all H.264 profiles.


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


            No vulnerabilities reported

            Install CRF

            You can download it from GitHub.
            You can use CRF 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 CRF 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 For Gradle installation, please refer .


            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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