internal void WrapTermWithDelegate(Action <ValueToKeyMappingTransformer> onFit)
{
_term = (ValueToKeyMappingEstimator)_term.WithOnFitDelegate(onFit);
}
internal OneHotEncodingEstimator(IHostEnvironment env, ColumnOptions[] columns, IDataView keyData = null)
{
Contracts.CheckValue(env, nameof(env));
_host = env.Register(nameof(OneHotEncodingEstimator));
_term = new ValueToKeyMappingEstimator(_host, columns, keyData);
var binaryCols = new List <(string outputColumnName, string inputColumnName)>();
var cols = new List <(string outputColumnName, string inputColumnName, bool bag)>();
for (int i = 0; i < columns.Length; i++)
{
var column = columns[i];
OneHotEncodingTransformer.OutputKind kind = columns[i].OutputKind;
switch (kind)
{
default:
throw _host.ExceptUserArg(nameof(column.OutputKind));
case OneHotEncodingTransformer.OutputKind.Key:
continue;
case OneHotEncodingTransformer.OutputKind.Bin:
binaryCols.Add((column.OutputColumnName, column.OutputColumnName));
break;
case OneHotEncodingTransformer.OutputKind.Ind:
cols.Add((column.OutputColumnName, column.OutputColumnName, false));
break;
case OneHotEncodingTransformer.OutputKind.Bag:
cols.Add((column.OutputColumnName, column.OutputColumnName, true));
break;
}
}
IEstimator <ITransformer> toBinVector = null;
IEstimator <ITransformer> toVector = null;
if (binaryCols.Count > 0)
{
toBinVector = new KeyToBinaryVectorMappingEstimator(_host, binaryCols.Select(x => (x.outputColumnName, x.inputColumnName)).ToArray());
}
if (cols.Count > 0)
{
toVector = new KeyToVectorMappingEstimator(_host, cols.Select(x => new KeyToVectorMappingEstimator.ColumnOptions(x.outputColumnName, x.inputColumnName, x.bag)).ToArray());
}
if (toBinVector != null && toVector != null)
{
_toSomething = toVector.Append(toBinVector);
}
else
{
if (toBinVector != null)
{
_toSomething = toBinVector;
}
else
{
_toSomething = toVector;
}
}
}