/// <summary>
/// Creates columns based of the columns properties argument
/// </summary>
/// <param name="colProp"></param>
/// <returns></returns>
private ColumnData CreateColumn(MetaColumn colProp)
{
//determine column type
ColumnType colType;
if (colProp.Type.Equals(ColumnType.Numeric.Description(), StringComparison.OrdinalIgnoreCase))
{
colType = ColumnType.Numeric;
}
else if (colProp.Type.Equals(ColumnType.Binary.Description(), StringComparison.OrdinalIgnoreCase))
{
colType = ColumnType.Binary;
}
else if (colProp.Type.Equals(ColumnType.Category.Description(), StringComparison.OrdinalIgnoreCase))
{
colType = ColumnType.Category;
}
else
{
colType = ColumnType.Unknown;
}
//determine encoding for category column type
CategoryEncoding colEncoding;
if (colProp.Encoding.Equals(CategoryEncoding.Level.Description(), StringComparison.OrdinalIgnoreCase))
{
colEncoding = CategoryEncoding.Level;
}
else if (colProp.Encoding.Equals(CategoryEncoding.OneHot.Description(), StringComparison.OrdinalIgnoreCase))
{
colEncoding = CategoryEncoding.OneHot;
}
else if (colProp.Encoding.Equals(CategoryEncoding.Dummy1.Description(), StringComparison.OrdinalIgnoreCase))
{
colEncoding = CategoryEncoding.Dummy1;
}
else if (colProp.Encoding.Equals(CategoryEncoding.Dummy2.Description(), StringComparison.OrdinalIgnoreCase))
{
colEncoding = CategoryEncoding.Dummy2;
}
else if (colProp.Encoding.Equals(CategoryEncoding.Binary1.Description(), StringComparison.OrdinalIgnoreCase))
{
colEncoding = CategoryEncoding.Binary1;
}
else if (colProp.Encoding.Equals(CategoryEncoding.Binary2.Description(), StringComparison.OrdinalIgnoreCase))
{
colEncoding = CategoryEncoding.Binary2;
}
else if (colProp.Encoding.Equals(CategoryEncoding.None.Description(), StringComparison.OrdinalIgnoreCase))
{
colEncoding = CategoryEncoding.None;
}
else
{
throw new Exception($"Unknown encoding !");
}
//create column data type
var isOutput = colProp.Param.Equals(ParameterType.Output.Description(), StringComparison.OrdinalIgnoreCase);
ColumnData col = new ColumnData(isOutput, colEncoding);
if (colProp.Scale.Equals(Scaling.MinMax.Description(), StringComparison.OrdinalIgnoreCase))
{
col.SetNormalization(Scaling.MinMax);
}
else if (colProp.Scale.Equals(Scaling.Gauss.Description(), StringComparison.OrdinalIgnoreCase))
{
col.SetNormalization(Scaling.Gauss);
}
else if (colProp.Scale.Equals(Scaling.None.Description(), StringComparison.OrdinalIgnoreCase))
{
col.SetNormalization(Scaling.None);
}
else
{
throw new Exception($"Unknown scaling for column '{col.Name}'");
}
//set missing value action
if (colProp.MissingValue.Equals(MissingValue.Ignore.Description(), StringComparison.OrdinalIgnoreCase))
{
col.MissingValue = MissingValue.Ignore;
}
else if (colProp.MissingValue.Equals(MissingValue.Average.Description(), StringComparison.OrdinalIgnoreCase))
{
col.MissingValue = MissingValue.Average;
}
else if (colProp.MissingValue.Equals(MissingValue.Random.Description(), StringComparison.OrdinalIgnoreCase))
{
col.MissingValue = MissingValue.Random;
}
else if (colProp.MissingValue.Equals(MissingValue.Mode.Description(), StringComparison.OrdinalIgnoreCase))
{
col.MissingValue = MissingValue.Mode;
}
else if (colProp.MissingValue.Equals(MissingValue.Max.Description(), StringComparison.OrdinalIgnoreCase))
{
col.MissingValue = MissingValue.Max;
}
else if (colProp.MissingValue.Equals(MissingValue.Min.Description(), StringComparison.OrdinalIgnoreCase))
{
col.MissingValue = MissingValue.Min;
}
else
{
throw new Exception($"Unknown missing value for column '{col.Name}'");
}
//set column name and type
col.Name = colProp.Name;
col.ColumnDataType = colType;
col.Encoding = colEncoding;
col.Id = colProp.Id;
col.Index = colProp.Index;
return(col);
}
