internal CountTargetEncodingEstimator(IHostEnvironment env, Options options)
{
Contracts.CheckValue(env, nameof(env));
_host = env.Register(nameof(CountTargetEncodingEstimator));
_host.CheckValue(options, nameof(options));
_host.CheckUserArg(Utils.Size(options.Columns) > 0, nameof(options.Columns), "Columns must be specified");
_host.CheckUserArg(!string.IsNullOrWhiteSpace(options.LabelColumn), nameof(options.LabelColumn), "Must specify the label column name");
if (!string.IsNullOrEmpty(options.InitialCountsModel))
{
_countTableEstimator = LoadFromFile(env, options.InitialCountsModel, options.LabelColumn,
options.Columns.Select(col => new InputOutputColumnPair(col.Name)).ToArray());
if (_countTableEstimator == null)
{
throw env.Except($"The file {options.InitialCountsModel} does not contain a CountTableTransformer");
}
}
else if (options.SharedTable)
{
var columns = new CountTableEstimator.SharedColumnOptions[options.Columns.Length];
for (int i = 0; i < options.Columns.Length; i++)
{
var column = options.Columns[i];
columns[i] = new CountTableEstimator.SharedColumnOptions(
column.Name,
column.Name,
column.PriorCoefficient ?? options.PriorCoefficient,
column.LaplaceScale ?? options.LaplaceScale,
column.Seed ?? options.Seed);
}
var builder = options.CountTable;
_host.CheckValue(builder, nameof(options.CountTable));
_countTableEstimator = new CountTableEstimator(_host, options.LabelColumn, builder.CreateComponent(_host), columns);
}
else
{
var columns = new CountTableEstimator.ColumnOptions[options.Columns.Length];
for (int i = 0; i < options.Columns.Length; i++)
{
var column = options.Columns[i];
var builder = column.CountTable ?? options.CountTable;
_host.CheckValue(builder, nameof(options.CountTable));
columns[i] = new CountTableEstimator.ColumnOptions(
column.Name,
column.Name,
builder.CreateComponent(_host),
column.PriorCoefficient ?? options.PriorCoefficient,
column.LaplaceScale ?? options.LaplaceScale,
column.Seed ?? options.Seed);
}
_countTableEstimator = new CountTableEstimator(_host, options.LabelColumn, columns);
}
_hashingColumns = InitializeHashingColumnOptions(options);
_hashingEstimator = new HashingEstimator(_host, _hashingColumns);
}
private CountTargetEncodingEstimator(IHostEnvironment env, CountTableEstimator estimator, CountTableEstimator.ColumnOptionsBase[] columns,
int numberOfBits, bool combine, uint hashingSeed)
{
Contracts.CheckValue(env, nameof(env));
_host = env.Register(nameof(CountTargetEncodingEstimator));
_hashingColumns = InitializeHashingColumnOptions(columns, numberOfBits, combine, hashingSeed);
_hashingEstimator = new HashingEstimator(_host, _hashingColumns);
_countTableEstimator = estimator;
}
internal CountTargetEncodingEstimator(IHostEnvironment env, string labelColumnName, CountTargetEncodingTransformer initialCounts, params InputOutputColumnPair[] columns)
{
Contracts.CheckValue(env, nameof(env));
_host = env.Register(nameof(CountTargetEncodingEstimator));
_host.CheckValue(initialCounts, nameof(initialCounts));
_host.CheckNonEmpty(columns, nameof(columns));
_host.Check(initialCounts.VerifyColumns(columns), nameof(columns));
_hashingEstimator = new HashingEstimator(_host, initialCounts.HashingTransformer.Columns.ToArray());
_countTableEstimator = new CountTableEstimator(_host, labelColumnName, initialCounts.CountTable,
columns.Select(c => new InputOutputColumnPair(c.OutputColumnName, c.OutputColumnName)).ToArray());
}