Tree splits in a H2o GBM Model

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By running the commands,

m <- h2o.getModel("depth_grid_model_4")
h2o.varimp(m)

I am able to view the model's performance as well as the variable importance.

How do I view the splits used in each tree of the GBM model?

Thanks

Splitting, A single tree will stop splitting when there are no more splits that satisfy the minimum The default for min_rows is 10, so this option rarely affects the GBM splits  Still, visualizing H2O model trees could be fully reproduced with any of network and visualization packages mentioned above. Visualizing H2O Trees. In the last step, a decision tree for the model created by GBM moved from H2O cluster memory to H2OTree object in R by means of Tree API.

New Tree API was added in H2O in 3.22.0.1. It lets you fetch trees into R/Python objects from any tree-based model in H2O (for details see here):

tree <- h2o.getModelTree(model = airlines.model, tree_number = 1, tree_class = "NO")

Having a tree representation from h2o in R plotting a tree explained here: Finally, You Can Plot H2O Decision Trees in R

h2o.tree.tree, The root node is guaranteed to be a split node, as a zero-depth tree :math:`t` of Obtaining a tree is a matter of a single call >>> tree = H2OTree(model = gbm,  Visualizing H2O GBM and Random Forest MOJO Models Trees in Python In this code-heavy tutorial, learn how to use the H2O machine library to build a decision tree model and save that model as MOJO. by

You can export the model as POJO with h2o.download_pojo() and then look at the full details of each tree in the file.

Tree splits in a H2o GBM Model, There is a tool to create visualizations for H2O-3 MOJO models. See the full documentation here:. A tree in H2O’s Python API is represented by a class named H2OTree and is placed in a package h2o.tree. Its fully qualified name is h2o.tree.H2OTree. As a sidenote for Python users also interested in R, the class name H2OTree is shared with R API. An instance of H2OTree represents a single tree related to a single model.

Inspecting Decision Trees in H2O, The root node is guaranteed to be a split node, as a zero-depth tree t of Simply substituting GBM model with DRF , XGBoost or any other  In R using H2O to split data and to tune the model, then visualizing results with ggplot to look for right value unfolds like this: split Titanic data into training and validation sets define grid search object with parameter max_depth launch grid search on GBM models and grid object to obtain AUC values (model performance) plot grid model AUC'es vs. max_depth values to determine "inflection point" where AUC growth stops or saturates (see plot below) register tree depth value at inflection

[PDF] Gradient Boosting Machine with H2O, A GBM is an ensemble of either regression or classification tree models. Both stochastic gradient boosting with column and row sampling (per split and per  For GBM, CART is used and XGBoost also utilizes an algorithm similar to CART. Thus, we will only discuss CART in this post. CART grows the tree greedily in a top-down fashion using binary splits. For each tree node, every split parallel to the coordinate axes are considered and the one minimizing the objective is chosen.

GBM, H2O's GBM sequentially builds regression trees on all the features of the model_id: (Optional) Specify a custom name for the model to use as a reference. in 64% of columns being considered at any given node to split. gbm <- h2o.gbm( ## standard model parameters x = predictors, y = response, training_frame = train, validation_frame = valid, ## more trees is better if the learning rate is small enough ## here, use "more than enough" trees - we have early stopping ntrees = 10000, ## smaller learning rate is better (this is a good value for most datasets, but

Comments
  • Please accept the answer below if it's addressed your question. Thanks!
  • I'm getting stuck on something simple here regarding the command line? What directory do I need to run this from? My current working directory? Or a specific h2o folder? I get the following message: Error: Could not find or load main class hex.genmodel.tools.PrintMojo
  • "java -cp /path/to/your/h2o.jar". You need to know where your h2o.jar is. It will either be in the R or Python directory where the h2o package gets installed, or you can download it from h2oai.download -> H2O latest stable release -> Download H2O.