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# = Reports::XMLReportUtil
#
# Utilities for XMLReport
#
module Reports
class XMLReportUtil
include REXML
# creates a confusion matrix as array (to be used as input for Reports::XMLReport::add_table)
# input is confusion matrix as returned by Lib::Predictions.confusion_matrix
#
# call-seq:
# create_confusion_matrix( confusion_matrix ) => array
#
def self.create_confusion_matrix( confusion_matrix )
raise "confusion matrix is null" unless confusion_matrix
num_classes = Math.sqrt(confusion_matrix.size)
class_values = []
confusion_matrix.each{ |key_map,value| class_values.push(key_map[:confusion_matrix_actual]) if class_values.index(key_map[:confusion_matrix_actual])==nil }
raise "confusion matrix invalid "+confusion_matrix.inspect unless num_classes.to_i == num_classes and class_values.size == num_classes
sum_predicted = {}
sum_actual = {}
class_values.each do |class_value|
sum_pred = 0
sum_act = 0
confusion_matrix.each do |key_map,value|
sum_pred += value if key_map[:confusion_matrix_predicted]==class_value
sum_act += value if key_map[:confusion_matrix_actual]==class_value
end
sum_predicted[class_value] = sum_pred
sum_actual[class_value] = sum_act
end
confusion = []
confusion.push( [ " ", " ", "actual" ] + [" "] * num_classes )
confusion.push( [ " ", " " ] + class_values + [ "total"])
class_values.each do |predicted|
row = [ (confusion.size==2 ? "predicted" : " "), predicted ]
class_values.each do |actual|
row.push( confusion_matrix[{:confusion_matrix_actual => actual, :confusion_matrix_predicted => predicted}].to_nice_s )
end
row.push( sum_predicted[predicted].to_nice_s )
confusion.push( row )
end
last_row = [ " ", "total" ]
class_values.each do |actual|
last_row.push( sum_actual[actual].to_nice_s )
end
last_row.push(" ")
confusion.push( last_row )
return confusion
end
def self.text_element(name, text)
node = Element.new(name)
node.text = text
return node
end
def self.url_element(url, description=url )
ulink = Element.new("ulink")
ulink.add_attributes({"url" => url})
ulink.text = description
return ulink
end
def self.attribute_element(name, attributes)
node = Element.new(name)
node.add_attributes(attributes)
return node
end
end
end
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