public double getAttributeValueAsDouble(String attributeName)
{
LearningAttribute attribute = attributes[attributeName];
if (attribute == null || !(attribute is NumericAttribute))
{
throw new ApplicationException(
"cannot return numerical value for non numeric attribute");
}
return(((NumericAttribute)attribute).valueAsDouble());
}
public static Example exampleFromString(String data,
DataSetSpecification dataSetSpec, Char separator)
{
Dictionary <String, LearningAttribute> attributes = new Dictionary <String, LearningAttribute>();
List <String> attributeValues = new List <String>();
string [] vals = data.Split(new char[] { ' ', '\t', ',' });
foreach (string v in vals)
{
if (!String.IsNullOrWhiteSpace(v))
{
attributeValues.Add(v);
}
}
if (dataSetSpec.isValid(attributeValues))
{
List <String> names = dataSetSpec.getAttributeNames();
List <String> .Enumerator nameiter = names.GetEnumerator();
List <String> .Enumerator valueiter = attributeValues.GetEnumerator();
while (nameiter.MoveNext() && valueiter.MoveNext())
{
String name = nameiter.Current;
AttributeSpecification attributeSpec = dataSetSpec
.getAttributeSpecFor(name);
LearningAttribute attribute = attributeSpec.createAttribute(valueiter.Current);
attributes.Add(name, attribute);
}
String targetAttributeName = dataSetSpec.getTarget();
return(new Example(attributes, attributes[targetAttributeName]));
}
else
{
throw new ApplicationException("Unable to construct Example from "
+ data);
}
}
public Example numerize(
Dictionary <String, Dictionary <String, int> > attrValueToNumber)
{
Dictionary <String, LearningAttribute> numerizedExampleData = new Dictionary <String, LearningAttribute>();
foreach (String key in attributes.Keys)
{
LearningAttribute attribute = attributes[key];
if (attribute is StringAttribute)
{
int correspondingNumber = attrValueToNumber[key][
attribute.valueAsString()];
NumericAttributeSpecification spec = new NumericAttributeSpecification(
key);
numerizedExampleData.Add(key, new NumericAttribute(
correspondingNumber, spec));
}
else // Numeric Attribute
{
numerizedExampleData.Add(key, attribute);
}
}
return(new Example(numerizedExampleData, numerizedExampleData[targetAttribute.name()]));
}
public Example(Dictionary<String, LearningAttribute> attributes,
LearningAttribute targetAttribute)
{
this.attributes = attributes;
this.targetAttribute = targetAttribute;
}
public Example(Dictionary <String, LearningAttribute> attributes,
LearningAttribute targetAttribute)
{
this.attributes = attributes;
this.targetAttribute = targetAttribute;
}
