java Archives - undefined

Sign Ripple transaction locally using ripple-lib-java

Posted on September 19, 2018November 28, 2018 by yohanes.gultom@gmail.com

Since rippled 1.1.0 disables public signing by default, we either need to host our own API server or sign Ripple transaction locally. Fortunately, ripple-lib-java gives clue on how to do this in one of its example. Long story short, we can use this simple method to do the signing: import java.math.BigDecimal; import com.ripple.core.types.known.tx.txns.Payment; import com.ripple.core.types.known.tx.signed.SignedTransaction;…

Linear Regression and cross validation in Java using Weka

Posted on March 19, 2018March 20, 2018 by yohanes.gultom@gmail.com

I stumbled upon a question in the internet about how to make price prediction based on price history in Android. Assuming the history size is quite small (few hundreds) and the attribute is not many (less than 20), I quickly thought that Weka Java API would be one of the easiest way to achieve this….

Check balance and send Ripple (XRP) using Java

Posted on March 9, 2018September 19, 2018 by yohanes.gultom@gmail.com

Update: As mentioned in here, since rippled 1.1.0 remote sign API is not allowed by default anymore. If you try to call it on wss://s.altnet.rippletest.net:51233 you will get “Signing is not supported by this server” error. Check this post on how to sign transaction locally using Java Ripple (XRP) provides some options to interact with their…

Training NER model using Stanford Core NLP CRF Classifier

Posted on April 7, 2017June 12, 2019 by yohanes.gultom@gmail.com

Named-Entity Recognition (NER) is one of the most popular NLP tasks. It’s popular because it produces annotation result that can be used directly (eg. extracting people name from text) or indirectly (eg. extracting feature for classification task). One of the easiest way to do it is by downloading and using latest Stanford Core NLP suite…