lgb.dump {lightgbm}

Dump LightGBM model to json

Description

Dump LightGBM model to json

Usage

lgb.dump(booster, num_iteration = NULL, start_iteration = 1L)

Arguments

booster

Object of class lgb.Booster

num_iteration

Number of iterations to be dumped. NULL or <= 0 means use best iteration

start_iteration

Index (1-based) of the first boosting round to dump. For example, passing start_iteration=5, num_iteration=3 for a regression model means "dump the fifth, sixth, and seventh tree"

New in version 4.4.0

Value

json format of model

Examples

library(lightgbm)


data(agaricus.train, package = "lightgbm")
train <- agaricus.train
dtrain <- lgb.Dataset(train$data, label = train$label)
data(agaricus.test, package = "lightgbm")
test <- agaricus.test
dtest <- lgb.Dataset.create.valid(dtrain, test$data, label = test$label)
params <- list(
  objective = "regression"
  , metric = "l2"
  , min_data = 1L
  , learning_rate = 1.0
  , num_threads = 2L
)
valids <- list(test = dtest)
model <- lgb.train(
  params = params
  , data = dtrain
  , nrounds = 10L
  , valids = valids
  , early_stopping_rounds = 5L
)
json_model <- lgb.dump(model)