Class: Weka::Core::Instances

Inherits:
Object
  • Object
show all
Defined in:
lib/weka/core/instances.rb

Constant Summary collapse

DEFAULT_RELATION_NAME = 
'Instances'

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(relation_name: DEFAULT_RELATION_NAME, attributes: [], &block) ⇒ Instances

Returns a new instance of Instances.



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# File 'lib/weka/core/instances.rb', line 29

def initialize(relation_name: DEFAULT_RELATION_NAME, attributes: [], &block)
  attribute_list = FastVector.new
  attributes.each { |attribute| attribute_list.add_element(attribute) }

  super(relation_name.to_s, attribute_list, 0)
end

Class Method Details

.from_arff(file) ⇒ Object 



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# File 'lib/weka/core/instances.rb', line 16

def from_arff(file)
  Loader.load_arff(file)
end

.from_csv(file) ⇒ Object 



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# File 'lib/weka/core/instances.rb', line 20

def from_csv(file)
  Loader.load_csv(file)
end

.from_json(file) ⇒ Object 



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# File 'lib/weka/core/instances.rb', line 24

def from_json(file)
  Loader.load_json(file)
end

Instance Method Details

#add_attributes(&block) ⇒ Object Also known as: with_attributes 



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# File 'lib/weka/core/instances.rb', line 48

def add_attributes(&block)
  self.instance_eval(&block) if block
  self
end

#add_instance(instance_or_values, weight: 1.0) ⇒ Object 



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# File 'lib/weka/core/instances.rb', line 147

def add_instance(instance_or_values, weight: 1.0)
  instance = instance_from(instance_or_values, weight: weight)
  add(instance)
end

#add_instances(data, weight: 1.0) ⇒ Object 



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# File 'lib/weka/core/instances.rb', line 152

def add_instances(data, weight: 1.0)
  data.each { |values| add_instance(values, weight: weight) }
end

#apply_filter(filter) ⇒ Object 



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# File 'lib/weka/core/instances.rb', line 162

def apply_filter(filter)
  filter.filter(self)
end

#attribute_names ⇒ Object 



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# File 'lib/weka/core/instances.rb', line 44

def attribute_names
  attributes.map(&:name)
end

#attributes ⇒ Object 



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# File 'lib/weka/core/instances.rb', line 40

def attributes
  enumerate_attributes.to_a
end

#class_attribute ⇒ Object 



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# File 'lib/weka/core/instances.rb', line 135

def class_attribute
  classAttribute if class_attribute_defined?
end

#class_attribute=(name) ⇒ Object 



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# File 'lib/weka/core/instances.rb', line 121

def class_attribute=(name)
  if name.nil?
    reset_class_attribute
  else
    ensure_attribute_defined!(name)
    setClass(attribute_with_name(name))
  end
end

#class_attribute_defined? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/weka/core/instances.rb', line 143

def class_attribute_defined?
  class_index >= 0
end

#date(name, format: 'yyyy-MM-dd HH:mm', class_attribute: false) ⇒ Object Also known as: add_date_attribute 



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# File 'lib/weka/core/instances.rb', line 115

def date(name, format: 'yyyy-MM-dd HH:mm', class_attribute: false)
  attribute = Attribute.new(name.to_s, format)
  add_attribute(attribute)
  self.class_attribute = name if class_attribute
end

#each ⇒ Object 



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# File 'lib/weka/core/instances.rb', line 57

def each
  if block_given?
    enumerate_instances.each { |instance| yield(instance) }
  else
    enumerate_instances
  end
end

#each_attribute ⇒ Object 



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# File 'lib/weka/core/instances.rb', line 71

def each_attribute
  if block_given?
    enumerate_attributes.each { |attribute| yield(attribute) }
  else
    enumerate_attributes
  end
end

#each_attribute_with_index ⇒ Object 



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# File 'lib/weka/core/instances.rb', line 79

def each_attribute_with_index
  enumerate_attributes.each_with_index do |attribute, index|
    yield(attribute, index) if block_given?
  end
end

#each_with_index ⇒ Object 



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# File 'lib/weka/core/instances.rb', line 65

def each_with_index
  enumerate_instances.each_with_index do |instance, index|
    yield(instance, index) if block_given?
  end
end

#instances ⇒ Object 



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# File 'lib/weka/core/instances.rb', line 36

def instances
  enumerate_instances.to_a
end

#internal_values_of(values) ⇒ Object 



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# File 'lib/weka/core/instances.rb', line 156

def internal_values_of(values)
  values.each_with_index.map do |value, index|
    attribute(index).internal_value_of(value)
  end
end

#nominal(name, values:, class_attribute: false) ⇒ Object Also known as: add_nominal_attribute 



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# File 'lib/weka/core/instances.rb', line 103

def nominal(name, values:, class_attribute: false)
  attribute = Attribute.new(name.to_s, Array(values).map(&:to_s))
  add_attribute(attribute)
  self.class_attribute = name if class_attribute
end

#numeric(name, class_attribute: false) ⇒ Object Also known as: add_numeric_attribute 



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# File 'lib/weka/core/instances.rb', line 97

def numeric(name, class_attribute: false)
  attribute = Attribute.new(name.to_s)
  add_attribute(attribute)
  self.class_attribute = name if class_attribute
end

#reset_class_attribute ⇒ Object 



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# File 'lib/weka/core/instances.rb', line 139

def reset_class_attribute
  set_class_index(-1)
end

#string(name, class_attribute: false) ⇒ Object Also known as: add_string_attribute 



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# File 'lib/weka/core/instances.rb', line 109

def string(name, class_attribute: false)
  attribute = Attribute.new(name.to_s, [])
  add_attribute(attribute)
  self.class_attribute = name if class_attribute
end

#to_arff(file) ⇒ Object 



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# File 'lib/weka/core/instances.rb', line 85

def to_arff(file)
  Saver.save_arff(file: file, instances: self)
end

#to_csv(file) ⇒ Object 



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# File 'lib/weka/core/instances.rb', line 89

def to_csv(file)
  Saver.save_csv(file: file, instances: self)
end

#to_json(file) ⇒ Object 



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# File 'lib/weka/core/instances.rb', line 93

def to_json(file)
  Saver.save_json(file: file, instances: self)
end