segmentation faults when splitratio = 0.5

[colleenchan]

When tuning a random forest using the caret package, segmentation faults occur often when splitratio = 0.5.

For a reproducible example, see: https://github.com/forestry-labs/GI-Collaboration/blob/main/code/3-Modeling/3.2-runPipeline.R

A segfault will occur with the parameters that are currently set:

dataset = "ehrbase"
estimator = "randomforest"
predictor = estimator
seed = 101
force = 0
embedding_dict = NULL
vi = 0

When running in a bash script, the error message would look something like:

• Fold7.Rep1: mtry=12, nodesizeStrictSpl=2, ntree=500, splitratio=0.5521

• Fold7.Rep1: mtry=12, nodesizeStrictSpl=4, ntree=500, splitratio=0.5000
  mtry nodesizeStrictSpl ntree splitratio
  4 12 4 500 0.5

*** caught segfault ***
address (nil), cause 'memory not mapped'

*** caught segfault ***
address 0x8e0, cause 'memory not mapped'

*** caught segfault ***
address (nil), cause 'memory not mapped'

*** caught segfault ***
address (nil), cause 'unknown'

*** caught segfault ***

*** caught segfault ***
address (nil), cause 'memory not mapped'

*** caught segfault ***
address (nil), cause 'memory not mapped'

*** caught segfault ***
address 0x448, cause 'memory not mapped'

*** caught segfault ***
address (nil), cause 'memory not mapped'

*** caught segfault ***
address (nil), cause 'memory not mapped'

*** caught segfault ***
address 0x88f, cause 'memory not mapped'

*** caught segfault ***
address (nil), cause 'memory not mapped'
Error: no more error handlers available (recursive errors?); invoking 'abort' restart

*** caught segfault ***
address (nil), cause 'memory not mapped'

*** caught segfault ***
address (nil), cause 'unknown'
An irrecoverable exception occurred. R is aborting now ...
An irrecoverable exception occurred. R is aborting now ...