[DOC] GPU Enabled Random Forest Regressor documentation is wrong.

[LaneMatthewJ]

Report incorrect documentation

Hello!

In working with cuML Random Forest Regressor (both single and multi-gpu) I found some errors in the documentation (for the current stable build*) and have noted them below!

Location of incorrect documentation

Problem 1: Run Time Error with max_depth = -1:

In the Dask Random Forest Regressor documentation there exists a subsection for max_detph suggesting that the regressor can have an unlimited max depth with -1 as a parameter.

Problem 2: Sytax Error with assignment in dictionary:

Under fit of both Random Forest Classifier and Random Forest Regressor there exists a syntax error:

This is equivalent to calling persist with the data and workers):

X_dask_cudf, y_dask_cudf = dask_client.persist([X_dask_cudf,
                                                y_dask_cudf],
                                               workers={
                                               X_dask_cudf=workers,
                                               y_dask_cudf=workers
                                               })

Describe the problems or issues found in the documentation

Problem 1

When attempting to use -1 as a parameter for max depth

rf = dask_cuRF(client=client, 
               n_streams = 1, 
               split_criterion=2, 
               max_features='sqrt', 
               min_samples_split=6, 
               n_estimators=800, 
               max_depth=-1, 
               n_bins=75,
               ignore_empty_partitions=True)

rf_trained = rf.fit(X_cudf_train_dask, y_cudf_train_dask)

The following error is returned:

RuntimeError: 2 of 2 worker jobs failed: Must specify max_depth >0 , Must specify max_depth >0 

Problem 2:

Syntax errors won't run.

Steps taken to verify documentation is incorrect

Problem 1:

Run Time Error occurs.

Problem 2:

Syntax Error will not run

*Suggested fix for documentation

Problem 1:

Update documentation to denote that there exists no unlimited depth option

Problem 2:

Update documentation to have no syntax errors.

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Report needed documentation

Report needed documentation
I think the documentation ought to match the implementation.

Describe the documentation you'd like
Updated documentation that matches the implementation

Steps taken to search for needed documentation
N/A

[divyegala]

@vinaydes @venkywonka could I ask one of you to check this out?

[venkywonka]

Thank you @LaneMatthewJ for the issue! Apologies for the delay and the improper documentation, have fixed it in the above linked PR 😄

[LaneMatthewJ]

Awesome! Thank you so much!

[LaneMatthewJ]

Hey @venkywonka! Out of curiosity does the documentation on the site only get built during the pushing of a new version? (also - thank you again!)

https://docs.rapids.ai/api/cuml/stable/api.html?highlight=random%20forest%20regressor#cuml.dask.ensemble.RandomForestRegressor

[venkywonka]

Hi, so sorry for the delay in response! If I understand correctly, every merge to the main branch is updated in the nightly docs but the URL you posted above is that of the stable docs that usually corresponds to one version previous to the default branch (ie, 22.06 as current default branch is 22.08).