H2O users can train GBM/DRF model and obtain a dot representation of the trees that make up the DRF/GBM tree ensemble: [https://github.com/h2oai/h2o-3/blob/master/h2o-genmodel/src/main/java/hex/genmodel/tools/PrintMojo.java|https://github.com/h2oai/h2o-3/blob/master/h2o-genmodel/src/main/java/hex/genmodel/tools/PrintMojo.java]

The dot format needs to be converted to an image/pdf using an external tool (graphviz). This is limiting in some deployments where installing new software is hard/impossible. We would like to find out if we can use [https://github.com/nidi3/graphviz-java|https://github.com/nidi3/graphviz-java] as a reliable substitute of the native graphviz.

The goal of this task is to find out whether graphviz-java is a good substitute (is stable and produces as good results as the native graphviz) and if it has reasonable dependencies in order to be integrated in H2O.

For this POC:

gbm.html#quick-start]

Export model in MOJO format (use documentation to find out how)

Download H2O-3 source code from GitHub: [https://github.com/h2oai/h2o-3|https://github.com/h2oai/h2o-3] and make sure you can build `h2o-genmodel` module using Gradle.

Explore Tree visualization options described on [http://docs.h2o.ai/h2o/latest-stable/h2o-docs/productionizing.html#viewing-a-mojo-model|http://docs.h2o.ai/h2o/latest-stable/h2o-docs/productionizing.html#viewing-a-mojo-model]

Use PrintMojo (see above^^^) to get a dot-representation of a GBM tree; convert to an image using graphviz

Modify [https://github.com/h2oai/h2o-3/blob/master/h2o-genmodel/src/main/java/hex/genmodel/tools/PrintMojo.java|https://github.com/h2oai/h2o-3/blob/master/h2o-genmodel/src/main/java/hex/genmodel/tools/PrintMojo.java] (located in h2o-genmodel module):

add a dependency on graphviz-java
add a new option that would let users produce directly an image of the Tree instead of the dot-format. 6) Compare results of native graphviz and graphviz-java

Suggestions:

Instead of generating the Graph input for graphviz-java using the Java API - a shortcut can be taken by generating the dot file and then parsing it using {code}MutableGraph g = Parser.read(getClass().getResourceAsStream("/tree.dot"));{code}
graphviz-java supports different engines - please make sure you are actually using the non-native graphviz as a backend engine for your comparison tests
Think out of the box - this Jira is formulated for graphviz - but if you find out there is a better solution that would accomplish the primary goal of generating the image of the tree - don’t be afraid to come up with an alternative solution!

Note: graphviz-java is licenced unser Apache License, Version 2.0 - compatible with H2O

h2oai / h2o-3

POC graphviz-java for use with Tree visualization in MOJO #8865

Train a GBM model, quick start links: [http://docs.h2o.ai/h2o/latest-stable/h2o-docs/data-science/gbm.html#quick-start|http://docs.h2o.ai/h2o/latest-stable/h2o-docs/data-science/gbm.html#quick-start]

Export model in MOJO format (use documentation to find out how)

Download H2O-3 source code from GitHub: [https://github.com/h2oai/h2o-3|https://github.com/h2oai/h2o-3] and make sure you can build `h2o-genmodel` module using Gradle.

Explore Tree visualization options described on [http://docs.h2o.ai/h2o/latest-stable/h2o-docs/productionizing.html#viewing-a-mojo-model|http://docs.h2o.ai/h2o/latest-stable/h2o-docs/productionizing.html#viewing-a-mojo-model]

Use PrintMojo (see above^^^) to get a dot-representation of a GBM tree; convert to an image using graphviz

Modify [https://github.com/h2oai/h2o-3/blob/master/h2o-genmodel/src/main/java/hex/genmodel/tools/PrintMojo.java|https://github.com/h2oai/h2o-3/blob/master/h2o-genmodel/src/main/java/hex/genmodel/tools/PrintMojo.java] (located in h2o-genmodel module):

h2oai / h2o-3

POC graphviz-java for use with Tree visualization in MOJO #8865

Train a GBM model, quick start links: [http://docs.h2o.ai/h2o/latest-stable/h2o-docs/data-science/gbm.html#quick-start|http://docs.h2o.ai/h2o/latest-stable/h2o-docs/data-science/gbm.html#quick-start]

Export model in MOJO format (use documentation to find out how)

Download H2O-3 source code from GitHub: [https://github.com/h2oai/h2o-3|https://github.com/h2oai/h2o-3] and make sure you can build h2o-genmodel module using Gradle.

Explore Tree visualization options described on [http://docs.h2o.ai/h2o/latest-stable/h2o-docs/productionizing.html#viewing-a-mojo-model|http://docs.h2o.ai/h2o/latest-stable/h2o-docs/productionizing.html#viewing-a-mojo-model]

Use PrintMojo (see above^^^) to get a dot-representation of a GBM tree; convert to an image using graphviz

Modify [https://github.com/h2oai/h2o-3/blob/master/h2o-genmodel/src/main/java/hex/genmodel/tools/PrintMojo.java|https://github.com/h2oai/h2o-3/blob/master/h2o-genmodel/src/main/java/hex/genmodel/tools/PrintMojo.java] (located in h2o-genmodel module):

Download H2O-3 source code from GitHub: [https://github.com/h2oai/h2o-3|https://github.com/h2oai/h2o-3] and make sure you can build `h2o-genmodel` module using Gradle.