Validate inputs for data splitting proportions

Checks whether data splitting proportion are valid (i.e., are non-negative, less than 1, and sum to 1).

validate_data_split(train_prop, valid_prop, test_prop)

Arguments

train_prop

Proportion of data to put in training set

valid_prop

Proportion of data to put in validation set

test_prop

Proportion of data to put in test set