vaeac_preprocess_data function

Preprocess Data for the vaeac approach

vaeac only supports numerical values. This function converts categorical features to numerics with class labels 1,2,...,K, and keeps track of the map between the original and new class labels. It also computes the one_hot_max_sizes.

vaeac_preprocess_data(
  data,
  log_exp_cont_feat = FALSE,
  normalize = TRUE,
  norm_mean = NULL,
  norm_std = NULL
)

Arguments

• data: matrix/data.frame/data.table containing the training data. Only the features and not the response.
• log_exp_cont_feat: Boolean. If we are to log transform all continuous features before sending the data to vaeac. vaeac creates unbounded values, so if the continuous features are strictly positive, as for Burr and Abalone data, it can be advantageous to log-transform the data to unbounded form before using vaeac. If TRUE, then vaeac_postprocess_data will take the exp of the results to get back to strictly positive values.
• norm_mean: Torch tensor (optional). A 1D array containing the means of the columns of x_torch.
• norm_std: Torch tensor (optional). A 1D array containing the stds of the columns of x_torch.

Returns

list containing data which can be used in vaeac, maps between original and new class names for categorical features, one_hot_max_sizes, and list of information about the data.

Author(s)

Lars Henry Berge Olsen