Function LGBM_DatasetCreateFromSampledColumn 

pub unsafe extern "C" fn LGBM_DatasetCreateFromSampledColumn(
    sample_data: *mut *mut f64,
    sample_indices: *mut *mut c_int,
    ncol: i32,
    num_per_col: *const c_int,
    num_sample_row: i32,
    num_local_row: i32,
    num_dist_row: i64,
    parameters: *const c_char,
    out: *mut DatasetHandle,
) -> c_int

Allocate the space for dataset and bucket feature bins according to sampled data.

Arguments

• sample_data - Sampled data, grouped by the column
• sample_indices - Indices of sampled data
• ncol - Number of columns
• num_per_col - Size of each sampling column
• num_sample_row - Number of sampled rows
• num_local_row - Total number of rows local to machine
• num_dist_row - Number of total distributed rows
• parameters - Additional parameters
• out (direction out) - Created dataset

Returns

0 when succeed, -1 when failure happens