base

package
Version: v0.0.1 Latest Latest
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Published: Jun 12, 2019 License: MIT Imports: 25 Imported by: 0

Documentation

Overview

Package base provides base interfaces for GoLearn objects to implement. It also provides a raw base for those objects.

Index

Constants

View Source
const (
	// CategoricalType is for Attributes which represent values distinctly.
	CategoricalType = iota
	// Float64Type should be replaced with a FractionalNumeric type [DEPRECATED].
	Float64Type
	BinaryType
)
View Source
const (
	SerializationFormatVersion = "golearn 1.0"
)

Variables

View Source
var Logger *log.Logger = log.New(os.Stdout, "", 0)

Logger is the default logger for the entire golearn package. It writes to stdout and has no prefix and no flags.

Functions

func CheckStrictlyCompatible

func CheckStrictlyCompatible(s1 FixedDataGrid, s2 FixedDataGrid) bool

CheckStrictlyCompatible checks whether two DenseInstances have AttributeGroups with the same Attributes, in the same order, enabling optimisations.

func ConvertAllRowsToMat64

func ConvertAllRowsToMat64(attrs []Attribute, f FixedDataGrid) ([]*mat.Dense, error)

ConvertAllRowsToMat64 takes a list of Attributes and returns a vector of all rows in a mat.Dense format.

func ConvertRowToMat64

func ConvertRowToMat64(attrs []Attribute, f FixedDataGrid, r int) (*mat.Dense, error)

ConvertRowToMat64 takes a list of Attributes, a FixedDataGrid and a row number, and returns the float values of that row in a mat.Dense format.

func DecomposeOnAttributeValues

func DecomposeOnAttributeValues(inst FixedDataGrid, at Attribute) map[string]FixedDataGrid

DecomposeOnAttributeValues divides the instance set depending on the value of a given Attribute, constructs child instances, and returns them in a map keyed on the string value of that Attribute.

IMPORTANT: calls panic() if the AttributeSpec of at cannot be determined.

func DecomposeOnNumericAttributeThreshold

func DecomposeOnNumericAttributeThreshold(inst FixedDataGrid, at Attribute, val float64) map[string]FixedDataGrid

DecomposeOnNumericAttributeThreshold divides the instance set depending on the value of a given numeric Attribute, constructs child instances, and returns them in a map keyed on whether that row had a higher value than the threshold or not.

IMPORTANT: calls panic() if the AttributeSpec of at cannot be determined, or if the Attribute is not numeric.

func DescribeError

func DescribeError(description string, err error) error

func FormatError

func FormatError(err error, format string, args ...interface{}) error

func GetClass

func GetClass(from DataGrid, row int) string

GetClass is a shortcut for returning the string value of the current class on a given row.

IMPORTANT: GetClass will panic if the number of ClassAttributes is set to anything other than one.

func GetClassDistribution

func GetClassDistribution(inst FixedDataGrid) map[string]int

GetClassDistribution returns a map containing the count of each class type (indexed by the class' string representation).

func GetClassDistributionAfterSplit

func GetClassDistributionAfterSplit(inst FixedDataGrid, at Attribute) map[string]map[string]int

GetClassDistributionAfterSplit returns the class distribution after a speculative split on a given Attribute.

func GetClassDistributionAfterThreshold

func GetClassDistributionAfterThreshold(inst FixedDataGrid, at Attribute, val float64) map[string]map[string]int

GetClassDistributionAfterThreshold returns the class distribution after a speculative split on a given Attribute using a threshold.

func GetClassDistributionByBinaryFloatValue

func GetClassDistributionByBinaryFloatValue(inst FixedDataGrid) []int

GetClassDistributionByBinaryFloatValue returns the count of each row which has a float value close to 0.0 or 1.0.

func GetClassDistributionByCategoricalValue

func GetClassDistributionByCategoricalValue(inst FixedDataGrid) []int

GetClassDistributionByIntegerVal returns a vector containing the count of each class vector (indexed by the class' system integer representation)

func InstancesAreEqual

func InstancesAreEqual(inst, other FixedDataGrid) bool

InstancesAreEqual checks whether a given Instance set is exactly the same as another (i.e. has the same size and values).

func InstancesTrainTestSplit

func InstancesTrainTestSplit(src FixedDataGrid, prop float64) (FixedDataGrid, FixedDataGrid)

InstancesTrainTestSplit takes a given Instances (src) and a train-test fraction (prop) and returns an array of two new Instances, one containing approximately that fraction and the other containing what's left.

IMPORTANT: this function is only meaningful when prop is between 0.0 and 1.0. Using any other values may result in odd behaviour.

func MarshalAttribute

func MarshalAttribute(a Attribute) (map[string]interface{}, error)

MarshalAttribute converts an Attribute to a JSON map.

func PackFloatToBytes

func PackFloatToBytes(val float64) []byte

PackFloatToBytes returns a 8-byte slice containing the byte values of a float64.

func PackFloatToBytesInline

func PackFloatToBytesInline(val float64, ret []byte)

PackFloatToBytesInline fills ret with the byte values of the float64 argument. ret must be at least 8 bytes in size.

func PackU64ToBytes

func PackU64ToBytes(val uint64) []byte

PackU64ToBytes allocates a return value of appropriate length and fills it with the values of val.

func PackU64ToBytesInline

func PackU64ToBytesInline(val uint64, ret []byte)

PackU64ToBytesInline fills ret with the byte values of val. Ret must have length at least 8.

func ParseARFFGetRows

func ParseARFFGetRows(filepath string) (int, error)

ParseARFFGetRows returns the number of data rows in an ARFF file.

func ParseCSVBuildInstancesFromReader

func ParseCSVBuildInstancesFromReader(r io.ReadSeeker, attrs []Attribute, hasHeader bool, u UpdatableDataGrid) (err error)

ParseCSVBuildInstancesFromReader updates an [[#UpdatableDataGrid]] from a io.Reader

func ParseCSVEstimateFilePrecision

func ParseCSVEstimateFilePrecision(filepath string) (int, error)

ParseCSVEstimateFilePrecision determines what the maximum number of digits occuring anywhere after the decimal point within the file.

func ParseCSVEstimateFilePrecisionFromReader

func ParseCSVEstimateFilePrecisionFromReader(r io.ReadSeeker) (int, error)

ParseCSVEstimateFilePrecisionFromReader determines what the maximum number of digits occuring anywhere after the decimal point within the reader.

func ParseCSVGetRows

func ParseCSVGetRows(filepath string) (int, error)

ParseCSVGetRows returns the number of rows in a given file.

func ParseCSVGetRowsFromReader

func ParseCSVGetRowsFromReader(r io.ReadSeeker) (int, error)

ParseCSVGetRowsFromReader returns the number of rows in a given reader.

func ParseCSVSniffAttributeNames

func ParseCSVSniffAttributeNames(filepath string, hasHeaders bool) []string

ParseCSVSniffAttributeNames returns a slice containing the top row of a given CSV file, or placeholders if hasHeaders is false.

func ParseCSVSniffAttributeNamesFromReader

func ParseCSVSniffAttributeNamesFromReader(r io.ReadSeeker, hasHeaders bool) []string

ParseCSVSniffAttributeNamesFromReader returns a slice containing the top row of a given reader with CSV-contents, or placeholders if hasHeaders is false.

func ParseDenseARFFBuildInstancesFromReader

func ParseDenseARFFBuildInstancesFromReader(r io.Reader, attrs []Attribute, u UpdatableDataGrid) (err error)

ParseDenseARFFBuildInstancesFromReader updates an [[#UpdatableDataGrid]] from a io.Reader

func ParseMatchAttributes

func ParseMatchAttributes(attrs, templateAttrs []Attribute)

ParseUtilsMatchAttrs tries to match the set of Attributes read from one file with those read from another, and writes the matching Attributes back to the original set.

func SaveEstimatorToGob

func SaveEstimatorToGob(path string, e *Estimator)

SaveEstimatorToGob serialises an estimator to a provided filepath, in gob format. See http://golang.org/pkg/encoding/gob for further details.

func SerializeAttribute

func SerializeAttribute(attr Attribute) ([]byte, error)

func SerializeInstances

func SerializeInstances(inst FixedDataGrid, f io.Writer) error

SerializeInstances stores a FixedDataGrid into an efficient format to the given io.Writer stream.

func SerializeInstancesToCSV

func SerializeInstancesToCSV(inst FixedDataGrid, path string) error

SerializesInstancesToCSV converts a FixedDataGrid into a CSV file format.

func SerializeInstancesToCSVStream

func SerializeInstancesToCSVStream(inst FixedDataGrid, f io.Writer) error

SerializeInstancesToCSVStream outputs a FixedDataGrid into a CSV file format, via the io.Writer stream.

func SerializeInstancesToDenseARFF

func SerializeInstancesToDenseARFF(inst FixedDataGrid, path, relation string) error

SerializeInstancesToDenseARFF writes the given FixedDataGrid to a densely-formatted ARFF file.

func SerializeInstancesToDenseARFFWithAttributes

func SerializeInstancesToDenseARFFWithAttributes(inst FixedDataGrid, rawAttrs []Attribute, path, relation string) error

SerializeInstancesToDenseARFFWithAttributes writes the given FixedDataGrid to a densely-formatted ARFF file with the header Attributes in the order given.

func SerializeInstancesToFile

func SerializeInstancesToFile(inst FixedDataGrid, path string) error

func SerializeInstancesToTarWriter

func SerializeInstancesToTarWriter(inst FixedDataGrid, tw *tar.Writer, prefix string, includeData bool) error

SerializeInstancesToTarWriter stores a FixedDataGrid into an efficient form given a tar.Writer.

func SerializeInstancesToWriterDenseARFFWithAttributes

func SerializeInstancesToWriterDenseARFFWithAttributes(w io.Writer, inst FixedDataGrid, rawAttrs []Attribute, relation string) error

func SetClass

func SetClass(at UpdatableDataGrid, row int, class string)

SetClass is a shortcut for updating the given class of a row.

IMPORTANT: SetClass will panic if the number of class Attributes is anything other than one.

func SetLogger

func SetLogger(logger *log.Logger)

SetLogger sets the base logger for the entire golearn package.

func SetLoggerOut

func SetLoggerOut(out io.Writer)

SetLoggerOut creates a new base logger for the entire golearn package using the given out instead of the default, os.Stdout. The other log options are set to the default, i.e. no prefix and no flags.

func Silent

func Silent()

Silent turns off logging throughout the golearn package by setting the logger to write to dev/null.

func UnpackBytesToFloat

func UnpackBytesToFloat(val []byte) float64

UnpackBytesToFloat converts a given byte slice into an equivalent float64.

func UnpackBytesToU64

func UnpackBytesToU64(val []byte) uint64

UnpackBytesToU64 converst a given byte slice into a uint64 value.

func WrapError

func WrapError(err error) error

Types

type Attribute

type Attribute interface {
	json.Unmarshaler
	json.Marshaler
	// Returns the general characterstics of this Attribute .
	// to avoid the overhead of casting
	GetType() int
	// Returns the human-readable name of this Attribute.
	GetName() string
	// Sets the human-readable name of this Attribute.
	SetName(string)
	// Gets a human-readable overview of this Attribute for debugging.
	String() string
	// Converts a value given from a human-readable string into a system
	// representation. For example, a CategoricalAttribute with values
	// ["iris-setosa", "iris-virginica"] would return the float64
	// representation of 0 when given "iris-setosa".
	GetSysValFromString(string) []byte
	// Converts a given value from a system representation into a human
	// representation. For example, a CategoricalAttribute with values
	// ["iris-setosa", "iris-viriginica"] might return "iris-setosa"
	// when given 0.0 as the argument.
	GetStringFromSysVal([]byte) string
	// Tests for equality with another Attribute. Other Attributes are
	// considered equal if:
	// * They have the same type (i.e. FloatAttribute <> CategoricalAttribute)
	// * They have the same name
	// * If applicable, they have the same categorical values (though not
	//   necessarily in the same order).
	Equals(Attribute) bool
	// Tests whether two Attributes can be represented in the same pond
	// i.e. they're the same size, and their byte order makes them meaningful
	// when considered together
	Compatible(Attribute) bool
}

Attributes disambiguate columns of the feature matrix and declare their types.

func AttributeDifference

func AttributeDifference(a1, a2 []Attribute) []Attribute

AttributeDifference returns the difference between two Attribute slices: i.e. all the values in a1 which do not occur in a2.

IMPORTANT: result is ordered the same as a1.

IMPORTANT: result only contains values from a1.

func AttributeDifferenceReferences

func AttributeDifferenceReferences(a1, a2 []Attribute) []Attribute

AttributeDifferenceReferences returns the difference between two Attribute slices: i.e. all the values in a1 which do not occur in a2.

IMPORTANT: result is not guaranteed to be ordered.

IMPORTANT: done using pointers for speed, use AttributeDifference if the Attributes originate from different DataGrids.

func AttributeIntersect

func AttributeIntersect(a1, a2 []Attribute) []Attribute

AttributeIntersect returns the intersection of two Attribute slices.

IMPORTANT: result is ordered in order of the first []Attribute argument.

IMPORTANT: result contains only Attributes from a1.

func AttributeIntersectReferences

func AttributeIntersectReferences(a1, a2 []Attribute) []Attribute

AttributeIntersectReferences returns the intersection of two Attribute slices.

IMPORTANT: result is not guaranteed to be ordered.

IMPORTANT: done using pointers for speed, use AttributeDifference if the Attributes originate from different DataGrids.

func CheckCompatible

func CheckCompatible(s1 FixedDataGrid, s2 FixedDataGrid) []Attribute

CheckCompatible checks whether two DataGrids have the same Attributes and if they do, it returns them.

func DeserializeAttribute

func DeserializeAttribute(data []byte) (Attribute, error)

func DeserializeAttributes

func DeserializeAttributes(data []byte) ([]Attribute, error)

DeserializeAttributes constructs a ve

func GetAttributeByName

func GetAttributeByName(inst FixedDataGrid, name string) Attribute

GetAttributeByName returns an Attribute matching a given name. Returns nil if one doesn't exist.

func NonClassAttributes

func NonClassAttributes(d DataGrid) []Attribute

NonClassAttrs returns all Attributes which aren't designated as a class Attribute.

func NonClassFloatAttributes

func NonClassFloatAttributes(d DataGrid) []Attribute

NonClassFloatAttributes returns all FloatAttributes which aren't designated as a class Attribute.

func ParseARFFGetAttributes

func ParseARFFGetAttributes(filepath string) []Attribute

ParseARFFGetAttributes returns the set of Attributes represented in this ARFF

func ParseCSVGetAttributes

func ParseCSVGetAttributes(filepath string, hasHeaders bool) []Attribute

ParseCSVGetAttributes returns an ordered slice of appropriate-ly typed and named Attributes.

func ParseCSVGetAttributesFromReader

func ParseCSVGetAttributesFromReader(r io.ReadSeeker, hasHeaders bool) []Attribute

ParseCSVGetAttributesFromReader returns an ordered slice of appropriate-ly typed and named Attributes.

func ParseCSVSniffAttributeTypes

func ParseCSVSniffAttributeTypes(filepath string, hasHeaders bool) []Attribute

ParseCSVSniffAttributeTypes returns a slice of appropriately-typed Attributes.

The type of a given attribute is determined by looking at the first data row of the CSV.

func ParseCSVSniffAttributeTypesFromReader

func ParseCSVSniffAttributeTypesFromReader(r io.ReadSeeker, hasHeaders bool) []Attribute

ParseCSVSniffAttributeTypesFromReader returns a slice of appropriately-typed Attributes.

The type of a given attribute is determined by looking at the first data row of the CSV.

func ReplaceDeserializedAttributeWithVersionFromInstances

func ReplaceDeserializedAttributeWithVersionFromInstances(deserialized Attribute, matchingWith FixedDataGrid) (Attribute, error)

ReplaceDeserializedAttributeWithVersionFromInstances takes an independently deserialized Attribute and matches it if possible with one from a candidate FixedDataGrid.

func ReplaceDeserializedAttributesWithVersionsFromInstances

func ReplaceDeserializedAttributesWithVersionsFromInstances(deserialized []Attribute, matchingWith FixedDataGrid) ([]Attribute, error)

ReplaceDeserializedAttributesWithVersionsFromInstances takes some independently loaded Attributes and matches them up with a candidate FixedDataGrid.

type AttributeGroup

type AttributeGroup interface {

	// Adds a new Attribute
	AddAttribute(Attribute) error
	// Returns all Attributes
	Attributes() []Attribute

	// Gets the size of each row in bytes (rounded up)
	RowSizeInBytes() int

	// Gets a reference to underlying memory
	Storage() []byte
	// Returns a human-readable summary
	String() string
	// contains filtered or unexported methods
}

AttributeGroups store related sequences of system values in memory for the DenseInstances structure.

type AttributeSpec

type AttributeSpec struct {
	// contains filtered or unexported fields
}

AttributeSpec is a pointer to a particular Attribute within a particular Instance structure and encodes position and storage information associated with that Attribute.

func ResolveAllAttributes

func ResolveAllAttributes(d DataGrid) []AttributeSpec

ResolveAllAttributes returns every AttributeSpec

func ResolveAttributes

func ResolveAttributes(d DataGrid, attrs []Attribute) []AttributeSpec

ResolveAttributes returns AttributeSpecs describing all of the Attributes.

func (*AttributeSpec) GetAttribute

func (a *AttributeSpec) GetAttribute() Attribute

GetAttribute returns an AttributeSpec which matches a given Attribute.

func (*AttributeSpec) String

func (a *AttributeSpec) String() string

String returns a human-readable description of this AttributeSpec.

type BaseClassifier

type BaseClassifier struct {
	TrainingData *DataGrid
}

BaseClassifier stores options common to every classifier.

type BaseEstimator

type BaseEstimator struct {
	Data *mat.Dense
}

type BaseRegressor

type BaseRegressor struct {
	Data   mat.Dense
	Name   string
	Labels []float64
}

type BinaryAttribute

type BinaryAttribute struct {
	Name string
}

BinaryAttributes can only represent 1 or 0.

func NewBinaryAttribute

func NewBinaryAttribute(name string) *BinaryAttribute

NewBinaryAttribute creates a BinaryAttribute with the given name

func (*BinaryAttribute) Compatible

func (b *BinaryAttribute) Compatible(other Attribute) bool

Compatible checks whether this Attribute can be represented in the same pond as another.

func (*BinaryAttribute) Equals

func (b *BinaryAttribute) Equals(other Attribute) bool

Equals checks for equality with another BinaryAttribute.

func (*BinaryAttribute) GetName

func (b *BinaryAttribute) GetName() string

GetName returns the name of this Attribute.

func (*BinaryAttribute) GetStringFromSysVal

func (b *BinaryAttribute) GetStringFromSysVal(val []byte) string

GetStringFromSysVal returns either 1 or 0.

func (*BinaryAttribute) GetSysValFromString

func (b *BinaryAttribute) GetSysValFromString(userVal string) []byte

GetSysValFromString returns either 1 or 0 in a single byte.

func (*BinaryAttribute) GetType

func (b *BinaryAttribute) GetType() int

GetType returns BinaryType.

func (*BinaryAttribute) MarshalJSON

func (b *BinaryAttribute) MarshalJSON() ([]byte, error)

MarshalJSON returns a JSON version of this BinaryAttribute for serialisation.

func (*BinaryAttribute) SetName

func (b *BinaryAttribute) SetName(name string)

SetName sets the name of this Attribute.

func (*BinaryAttribute) String

func (b *BinaryAttribute) String() string

String returns a human-redable representation.

func (*BinaryAttribute) UnmarshalJSON

func (b *BinaryAttribute) UnmarshalJSON(data []byte) error

UnmarshalJSON unpacks a BinaryAttribute from serialisation. Usually, there's nothing to deserialize.

type BinaryAttributeGroup

type BinaryAttributeGroup struct {
	// contains filtered or unexported fields
}

BinaryAttributeGroups contain only BinaryAttributes Compact each Attribute to a bit for better storage

func (*BinaryAttributeGroup) AddAttribute

func (b *BinaryAttributeGroup) AddAttribute(a Attribute) error

AddAttribute adds an Attribute to this BinaryAttributeGroup

func (*BinaryAttributeGroup) Attributes

func (b *BinaryAttributeGroup) Attributes() []Attribute

Attributes returns a slice of Attributes in this BinaryAttributeGroup.

func (*BinaryAttributeGroup) RowSizeInBytes

func (b *BinaryAttributeGroup) RowSizeInBytes() int

RowSizeInBytes returns the size of each row in bytes (rounded up to nearest byte).

func (*BinaryAttributeGroup) Storage

func (b *BinaryAttributeGroup) Storage() []byte

Storage returns a reference to the underlying storage.

IMPORTANT: don't modify

func (*BinaryAttributeGroup) String

func (b *BinaryAttributeGroup) String() string

String returns a human-readable summary.

type CategoricalAttribute

type CategoricalAttribute struct {
	Name string
	// contains filtered or unexported fields
}

CategoricalAttribute is an Attribute implementation which stores discrete string values - useful for representing classes.

func NewCategoricalAttribute

func NewCategoricalAttribute() *CategoricalAttribute

NewCategoricalAttribute creates a blank CategoricalAttribute.

func (*CategoricalAttribute) Compatible

func (Attr *CategoricalAttribute) Compatible(other Attribute) bool

Compatible checks that this CategoricalAttribute has the same values as another, in the same order.

func (*CategoricalAttribute) Equals

func (Attr *CategoricalAttribute) Equals(other Attribute) bool

Equals checks equality against another Attribute.

Two CategoricalAttributes are considered equal if they contain the same values and have the same name. Otherwise, this function returns false.

func (*CategoricalAttribute) GetName

func (Attr *CategoricalAttribute) GetName() string

GetName returns the human-readable name assigned to this attribute.

func (*CategoricalAttribute) GetStringFromSysVal

func (Attr *CategoricalAttribute) GetStringFromSysVal(rawVal []byte) string

GetStringFromSysVal returns a human-readable value from the given system-representation value val.

IMPORTANT: This function calls panic() if the value is greater than the length of the array. TODO: Return a user-configurable default instead.

func (*CategoricalAttribute) GetSysVal

func (Attr *CategoricalAttribute) GetSysVal(userVal string) []byte

GetSysVal returns the system representation of userVal as an index into the Values slice If the userVal can't be found, it returns nothing.

func (*CategoricalAttribute) GetSysValFromString

func (Attr *CategoricalAttribute) GetSysValFromString(rawVal string) []byte

GetSysValFromString returns the system representation of rawVal as an index into the Values slice. If rawVal is not inside the Values slice, it is appended.

IMPORTANT: If no system representation yet exists, this functions adds it. If you need to determine whether rawVal exists: use GetSysVal and check for a zero-length return value.

Example: if the CategoricalAttribute contains the values ["iris-setosa", "iris-virginica"] and "iris-versicolor" is provided as the argument, the Values slide becomes ["iris-setosa", "iris-virginica", "iris-versicolor"] and 2.00 is returned as the system representation.

func (*CategoricalAttribute) GetType

func (Attr *CategoricalAttribute) GetType() int

GetType returns CategoricalType to avoid casting overhead.

func (*CategoricalAttribute) GetUsrVal

func (Attr *CategoricalAttribute) GetUsrVal(sysVal []byte) string

GetUsrVal returns a human-readable representation of the given sysVal.

IMPORTANT: this function doesn't check the boundaries of the array.

func (*CategoricalAttribute) GetValues

func (Attr *CategoricalAttribute) GetValues() []string

GetValues returns all the values currently defined

func (*CategoricalAttribute) MarshalJSON

func (Attr *CategoricalAttribute) MarshalJSON() ([]byte, error)

MarshalJSON returns a JSON version of this Attribute.

func (*CategoricalAttribute) SetName

func (Attr *CategoricalAttribute) SetName(name string)

SetName sets the human-readable name on this attribute.

func (*CategoricalAttribute) String

func (Attr *CategoricalAttribute) String() string

String returns a human-readable summary of this Attribute.

Returns a string containing the list of human-readable values this CategoricalAttribute can take.

func (*CategoricalAttribute) UnmarshalJSON

func (Attr *CategoricalAttribute) UnmarshalJSON(data []byte) error

UnmarshalJSON returns a JSON version of this Attribute.

type Classifier

type Classifier interface {
	// Takes a set of Instances, copies the class Attribute
	// and constructs a new set of Instances of equivalent
	// length with only the class Attribute and fills it in
	// with predictions.
	Predict(FixedDataGrid) (FixedDataGrid, error)
	// Takes a set of instances and updates the Classifier's
	// internal structures to enable prediction
	Fit(FixedDataGrid) error
	// Why not make every classifier return a nice-looking string?
	String() string

	// Save the classifier to a file
	Save(string) error
	// Read recreates the classifier from a file
	Load(string) error

	// Retrieves the metadata associated with this classifer
	// (required for Ensembles)
	GetMetadata() ClassifierMetadataV1

	// Used when something is saved as part of an ensemble
	SaveWithPrefix(*ClassifierSerializer, string) error
	LoadWithPrefix(*ClassifierDeserializer, string) error
}

Classifier implementations predict categorical class labels.

type ClassifierDeserializer

type ClassifierDeserializer struct {
	Metadata *ClassifierMetadataV1
	// contains filtered or unexported fields
}

ClassifierDeserializer attaches helper functions useful for reading classificatiers. (UNSTABLE).

func ReadSerializedClassifierStub

func ReadSerializedClassifierStub(filePath string) (*ClassifierDeserializer, error)

ReadSerializedClassifierStub is the counterpart of CreateSerializedClassifierStub. It's used inside SaveableClassifiers to read information from a perviously saved model file.

func (*ClassifierDeserializer) Close

func (c *ClassifierDeserializer) Close()

Close cleans up everything.

func (*ClassifierDeserializer) GetAttributeForKey

func (c *ClassifierDeserializer) GetAttributeForKey(key string) (Attribute, error)

GetAttributeForKey returns an Attribute stored at a given key

func (*ClassifierDeserializer) GetAttributesForKey

func (c *ClassifierDeserializer) GetAttributesForKey(key string) ([]Attribute, error)

GetAttributesForKey returns an Attribute list stored at a given key

func (*ClassifierDeserializer) GetBytesForKey

func (c *ClassifierDeserializer) GetBytesForKey(key string) ([]byte, error)

GetBytesForKey returns the bytes at a given location in the output.

func (*ClassifierDeserializer) GetInstancesForKey

func (c *ClassifierDeserializer) GetInstancesForKey(key string) (FixedDataGrid, error)

GetInstancesForKey deserializes some instances stored in a classifier output file

func (*ClassifierDeserializer) GetJSONForKey

func (c *ClassifierDeserializer) GetJSONForKey(key string, v interface{}) error

GetJSONForKey deserializes a JSON key in the output file.

func (*ClassifierDeserializer) GetStringForKey

func (c *ClassifierDeserializer) GetStringForKey(key string) (string, error)

func (*ClassifierDeserializer) GetU64ForKey

func (c *ClassifierDeserializer) GetU64ForKey(key string) (uint64, error)

GetUInt64ForKey returns a int64 stored at a given key

func (*ClassifierDeserializer) Prefix

func (c *ClassifierDeserializer) Prefix(prefix string, suffix string) string

Prefix outputs a string in the right format for TAR

func (*ClassifierDeserializer) ReadMetadataAtPrefix

func (c *ClassifierDeserializer) ReadMetadataAtPrefix(prefix string) (ClassifierMetadataV1, error)

ReadMetadataAtPrefix reads the METADATA file after prefix. If an error is returned, the first value is undefined.

type ClassifierMetadataV1

type ClassifierMetadataV1 struct {
	// FormatVersion should always be 1 for this structure
	FormatVersion int `json:"format_version"`
	// Uses the classifier name (provided by the classifier)
	ClassifierName string `json:"classifier"`
	// ClassifierVersion is also provided by the classifier
	// and checks whether this version of GoLearn can read what's
	// be written.
	ClassifierVersion string `json"classifier_version"`
	// This is a custom metadata field, provided by the classifier
	ClassifierMetadata map[string]interface{} `json:"classifier_metadata"`
}

ClassifierMetadataV1 is what gets written into METADATA in a classification file format.

type ClassifierSerializer

type ClassifierSerializer struct {
	// contains filtered or unexported fields
}

ClassifierSerializer is an object used by SaveableClassifiers.

func CreateSerializedClassifierStub

func CreateSerializedClassifierStub(filePath string, metadata ClassifierMetadataV1) (*ClassifierSerializer, error)

CreateSerializedClassifierStub generates a file to serialize into and writes the METADATA header.

func (*ClassifierSerializer) Close

func (c *ClassifierSerializer) Close() error

Close finalizes the Classifier serialization session.

func (*ClassifierSerializer) Prefix

func (c *ClassifierSerializer) Prefix(prefix string, suffix string) string

Prefix outputs a string in the right format for TAR

func (*ClassifierSerializer) WriteAttributeForKey

func (c *ClassifierSerializer) WriteAttributeForKey(key string, a Attribute) error

WriteAttributeForKey creates a new entry in the file containing a serialized representation of Attribute

func (*ClassifierSerializer) WriteAttributesForKey

func (c *ClassifierSerializer) WriteAttributesForKey(key string, attrs []Attribute) error

WriteAttributesForKey does the same as WriteAttributeForKey, just with more than one Attribute.

func (*ClassifierSerializer) WriteBytesForKey

func (c *ClassifierSerializer) WriteBytesForKey(key string, b []byte) error

WriteBytesForKey creates a new entry in the serializer file with some user-defined bytes.

func (*ClassifierSerializer) WriteInstancesForKey

func (c *ClassifierSerializer) WriteInstancesForKey(key string, g FixedDataGrid, includeData bool) error

WriteInstances for key creates a new entry in the file containing some training instances

func (*ClassifierSerializer) WriteJSONForKey

func (c *ClassifierSerializer) WriteJSONForKey(key string, v interface{}) error

WriteJSONForKey creates a new entry in the file with an interface serialized as JSON.

func (*ClassifierSerializer) WriteMetadataAtPrefix

func (c *ClassifierSerializer) WriteMetadataAtPrefix(prefix string, metadata ClassifierMetadataV1) error

WriteMetadataAtPrefix outputs a METADATA entry in the right place

func (*ClassifierSerializer) WriteU64ForKey

func (c *ClassifierSerializer) WriteU64ForKey(key string, v uint64) error

WriteU64ForKey creates a new entry in the serializer file with the bytes of a uint64

type DataGrid

type DataGrid interface {
	// Retrieves a given Attribute's specification
	GetAttribute(Attribute) (AttributeSpec, error)
	// Retrieves details of every Attribute
	AllAttributes() []Attribute
	// Marks an Attribute as a class Attribute
	AddClassAttribute(Attribute) error
	// Unmarks an Attribute as a class Attribute
	RemoveClassAttribute(Attribute) error
	// Returns details of all class Attributes
	AllClassAttributes() []Attribute
	// Gets the bytes at a given position or nil
	Get(AttributeSpec, int) []byte
	// Convenience function for iteration.
	MapOverRows([]AttributeSpec, func([][]byte, int) (bool, error)) error
}

DataGrid implementations represent data addressable by rows and columns.

type DenseInstances

type DenseInstances struct {
	// contains filtered or unexported fields
}

DenseInstances stores each Attribute value explicitly in a large grid.

func CopyDenseInstances

func CopyDenseInstances(template *DenseInstances, templateAttrs []Attribute) *DenseInstances

CopyDenseInstancesStructure returns a new DenseInstances with identical structure (layout, Attributes) to the original

func DeserializeInstances

func DeserializeInstances(f io.ReadSeeker) (ret *DenseInstances, err error)

DeserializeInstances returns a DenseInstances using a given io.Reader.

func DeserializeInstancesFromTarReader

func DeserializeInstancesFromTarReader(tr *FunctionalTarReader, prefix string) (ret *DenseInstances, err error)

DeserializeInstancesFromTarReader returns DenseInstances from a FunctionalTarReader with the name prefix.

func NewDenseCopy

func NewDenseCopy(of FixedDataGrid) *DenseInstances

NewDenseCopy generates a new DenseInstances set from an existing FixedDataGrid.

func NewDenseInstances

func NewDenseInstances() *DenseInstances

NewDenseInstances generates a new DenseInstances set with an anonymous EDF mapping and default settings.

func NewStructuralCopy

func NewStructuralCopy(of FixedDataGrid) *DenseInstances

NewStructuralCopy generates an empty DenseInstances with the same layout as an existing FixedDataGrid, but with no data.

func ParseCSVToInstances

func ParseCSVToInstances(filepath string, hasHeaders bool) (instances *DenseInstances, err error)

ParseCSVToInstances reads the CSV file given by filepath and returns the read Instances.

func ParseCSVToInstancesFromReader

func ParseCSVToInstancesFromReader(r io.ReadSeeker, hasHeaders bool) (instances *DenseInstances, err error)

ParseCSVToInstancesFromReader reads the reader containing CSV and returns the read Instances.

func ParseCSVToInstancesWithAttributeGroups

func ParseCSVToInstancesWithAttributeGroups(filepath string, attrGroups, classAttrGroups map[string]string, attrOverrides map[int]Attribute, hasHeaders bool) (instances *DenseInstances, err error)

ParseCSVToInstancesWithAttributeGroups reads the CSV file given by filepath, and returns the read DenseInstances, but also makes sure to group any Attributes specified in the first argument and also any class Attributes specified in the second

func ParseCSVToInstancesWithAttributeGroupsFromReader

func ParseCSVToInstancesWithAttributeGroupsFromReader(r io.ReadSeeker, attrGroups, classAttrGroups map[string]string, attrOverrides map[int]Attribute, hasHeaders bool) (instances *DenseInstances, err error)

ParseCSVToInstancesWithAttributeGroupsFromReader reads the CSV file given by filepath, and returns the read DenseInstances, but also makes sure to group any Attributes specified in the first argument and also any class Attributes specified in the second

func ParseCSVToTemplatedInstances

func ParseCSVToTemplatedInstances(filepath string, hasHeaders bool, template *DenseInstances) (instances *DenseInstances, err error)

ParseCSVToInstancesTemplated reads the CSV file given by filepath and returns the read Instances, using another already read DenseInstances as a template.

func ParseCSVToTemplatedInstancesFromReader

func ParseCSVToTemplatedInstancesFromReader(r io.ReadSeeker, hasHeaders bool, template *DenseInstances) (instances *DenseInstances, err error)

ParseCSVToTemplatedInstancesFromReader reads the reader containing CSV and returns the read Instances, using another already read DenseInstances as a template.

func ParseDenseARFFToInstances

func ParseDenseARFFToInstances(filepath string) (ret *DenseInstances, err error)

ParseDenseARFFToInstances parses the dense ARFF File into a FixedDataGrid

func (*DenseInstances) AddAttribute

func (inst *DenseInstances) AddAttribute(a Attribute) AttributeSpec

AddAttribute adds an Attribute to this set of DenseInstances Creates a default AttributeGroup for it if a suitable one doesn't exist. Returns an AttributeSpec for subsequent Set() calls.

IMPORTANT: will panic if storage has been allocated via Extend.

func (*DenseInstances) AddAttributeToAttributeGroup

func (inst *DenseInstances) AddAttributeToAttributeGroup(newAttribute Attribute, ag string) (AttributeSpec, error)

AddAttributeToAttributeGroup adds an Attribute to a given ag

func (*DenseInstances) AddClassAttribute

func (inst *DenseInstances) AddClassAttribute(a Attribute) error

AddClassAttribute sets an Attribute to be a class Attribute.

func (*DenseInstances) AllAttributeGroups

func (inst *DenseInstances) AllAttributeGroups() map[string]AttributeGroup

AllAttributeGroups returns a copy of the available AttributeGroups

func (*DenseInstances) AllAttributes

func (inst *DenseInstances) AllAttributes() []Attribute

AllAttributes returns a slice of all Attributes.

func (*DenseInstances) AllClassAttributes

func (inst *DenseInstances) AllClassAttributes() []Attribute

AllClassAttributes returns a slice of Attributes which have been designated class Attributes.

func (*DenseInstances) CreateAttributeGroup

func (inst *DenseInstances) CreateAttributeGroup(name string, size int) (err error)

CreateAttributeGroup adds a new AttributeGroup to this set of instances with a given name. If the size is 0, a bit-ag is added if the size of not 0, then the size of each ag attribute is set to that number of bytes.

func (*DenseInstances) Extend

func (inst *DenseInstances) Extend(rows int) error

Extend extends this set of Instances to store rows additional rows. It's recommended to set rows to something quite large.

IMPORTANT: panics if the allocation fails

func (*DenseInstances) Get

func (inst *DenseInstances) Get(a AttributeSpec, row int) []byte

Get gets a particular Attribute (given as an AttributeSpec) on a particular row. AttributeSpecs can be obtained using GetAttribute() or AddAttribute()

func (*DenseInstances) GetAttribute

func (inst *DenseInstances) GetAttribute(get Attribute) (AttributeSpec, error)

GetAttribute returns an Attribute equal to the argument.

TODO: Write a function to pre-compute this once we've allocated TODO: Write a utility function which retrieves all AttributeSpecs for a given instance set.

func (*DenseInstances) GetAttributeGroup

func (inst *DenseInstances) GetAttributeGroup(name string) (AttributeGroup, error)

GetAttributeGroup returns a reference to a AttributeGroup of a given name /

func (*DenseInstances) MapOverRows

func (inst *DenseInstances) MapOverRows(asv []AttributeSpec, mapFunc func([][]byte, int) (bool, error)) error

MapOverRows passes each row map into a function. First argument is a list of AttributeSpec in the order they're needed in for the function. The second is the function to call on each row.

func (*DenseInstances) RemoveClassAttribute

func (inst *DenseInstances) RemoveClassAttribute(a Attribute) error

RemoveClassAttribute removes an Attribute from the set of class Attributes.

func (*DenseInstances) RowString

func (inst *DenseInstances) RowString(row int) string

RowString returns a string representation of a given row.

func (*DenseInstances) Set

func (inst *DenseInstances) Set(a AttributeSpec, row int, val []byte)

Set sets a particular Attribute (given as an AttributeSpec) on a particular row to a particular value.

AttributeSpecs can be obtained using GetAttribute() or AddAttribute().

IMPORTANT: Will panic() if the AttributeSpec isn't valid

IMPORTANT: Will panic() if the row is too large

IMPORTANT: Will panic() if the val is not the right length

func (*DenseInstances) Size

func (inst *DenseInstances) Size() (int, int)

Size returns the number of Attributes as the first return value and the maximum allocated row as the second value.

func (*DenseInstances) String

func (inst *DenseInstances) String() string

String returns a human-readable summary of this dataset.

type Estimator

type Estimator interface {
	Fit()
}

An Estimator is object that can ingest some data and train on it.

type Filter

type Filter interface {
	// Adds an Attribute to the filter
	AddAttribute(Attribute) error
	// Allows mapping old to new Attributes
	GetAttributesAfterFiltering() []FilteredAttribute
	// Gets a string for printing
	String() string
	// Accepts an old Attribute, the new one and returns a sequence
	Transform(Attribute, Attribute, []byte) []byte
	// Builds the filter
	Train() error
}

Filters transform the byte sequences stored in DataGrid implementations.

type FilteredAttribute

type FilteredAttribute struct {
	Old Attribute
	New Attribute
}

FilteredAttributes represent a mapping from the output generated by a filter to the original value.

type FixedAttributeGroup

type FixedAttributeGroup struct {
	// contains filtered or unexported fields
}

FixedAttributeGroups contain a particular number of rows of a particular number of Attributes, all of a given type.

func (*FixedAttributeGroup) AddAttribute

func (f *FixedAttributeGroup) AddAttribute(a Attribute) error

AddAttribute adds an attribute to this FixedAttributeGroup

func (*FixedAttributeGroup) Attributes

func (f *FixedAttributeGroup) Attributes() []Attribute

Attributes returns a slice of Attributes in this FixedAttributeGroup

func (*FixedAttributeGroup) RowSizeInBytes

func (f *FixedAttributeGroup) RowSizeInBytes() int

RowSizeInBytes returns the size of each row in bytes

func (*FixedAttributeGroup) Storage

func (f *FixedAttributeGroup) Storage() []byte

Storage returns a slice of FixedAttributeGroupStorageRefs which can be used to access the memory in this pond.

func (*FixedAttributeGroup) String

func (f *FixedAttributeGroup) String() string

String gets a human-readable summary

type FixedDataGrid

type FixedDataGrid interface {
	DataGrid
	// Returns a string representation of a given row
	RowString(int) string
	// Returns the number of Attributes and rows currently allocated
	Size() (int, int)
}

FixedDataGrid implementations have a size known in advance and implement all of the functionality offered by DataGrid implementations.

func LazyShuffle

func LazyShuffle(from FixedDataGrid) FixedDataGrid

LazyShuffle randomizes the row order without re-ordering the rows via an InstancesView.

func LazySort

func LazySort(inst FixedDataGrid, direction SortDirection, attrs []AttributeSpec) (FixedDataGrid, error)

LazySort also does a sort, but returns an InstanceView and doesn't actually reorder the rows, just makes it look like they've been reordered See also: Sort

func SampleWithReplacement

func SampleWithReplacement(from FixedDataGrid, size int) FixedDataGrid

SampleWithReplacement returns a new FixedDataGrid containing an equal number of random rows drawn from the original FixedDataGrid

IMPORTANT: There's a high chance of seeing duplicate rows whenever size is close to the row count.

func Shuffle

func Shuffle(from FixedDataGrid) FixedDataGrid

Shuffle randomizes the row order either in place (if DenseInstances) or using LazyShuffle.

func Sort

func Sort(inst FixedDataGrid, direction SortDirection, attrs []AttributeSpec) (FixedDataGrid, error)

Sort does a radix sort of DenseInstances, using SortDirection direction (Ascending or Descending) with attrs as a slice of Attribute indices that you want to sort by.

IMPORTANT: Radix sort is not stable, so ordering outside the attributes used for sorting is arbitrary.

type FloatAttribute

type FloatAttribute struct {
	Name      string
	Precision int
}

FloatAttribute is an implementation which stores floating point representations of numbers.

func NewFloatAttribute

func NewFloatAttribute(name string) *FloatAttribute

NewFloatAttribute returns a new FloatAttribute with a default precision of 2 decimal places

func (*FloatAttribute) CheckSysValFromString

func (Attr *FloatAttribute) CheckSysValFromString(rawVal string) ([]byte, error)

CheckSysValFromString confirms whether a given rawVal can be converted into a valid system representation. If it can't, the returned value is nil.

func (*FloatAttribute) Compatible

func (Attr *FloatAttribute) Compatible(other Attribute) bool

Compatible checks whether this FloatAttribute can be ponded with another Attribute (checks if they're both FloatAttributes)

func (*FloatAttribute) Equals

func (Attr *FloatAttribute) Equals(other Attribute) bool

Equals tests a FloatAttribute for equality with another Attribute.

Returns false if the other Attribute has a different name or if the other Attribute is not a FloatAttribute.

func (*FloatAttribute) GetFloatFromSysVal

func (Attr *FloatAttribute) GetFloatFromSysVal(rawVal []byte) float64

GetFloatFromSysVal converts a given system value to a float

func (*FloatAttribute) GetName

func (Attr *FloatAttribute) GetName() string

GetName returns this FloatAttribute's human-readable name.

func (*FloatAttribute) GetStringFromSysVal

func (Attr *FloatAttribute) GetStringFromSysVal(rawVal []byte) string

GetStringFromSysVal converts a given system value to to a string with two decimal places of precision.

func (*FloatAttribute) GetSysValFromString

func (Attr *FloatAttribute) GetSysValFromString(rawVal string) []byte

GetSysValFromString parses the given rawVal string to a float64 and returns it.

float64 happens to be a 1-to-1 mapping to the system representation. IMPORTANT: This function panic()s if rawVal is not a valid float. Use CheckSysValFromString to confirm.

func (*FloatAttribute) GetType

func (Attr *FloatAttribute) GetType() int

GetType returns Float64Type.

func (*FloatAttribute) MarshalJSON

func (f *FloatAttribute) MarshalJSON() ([]byte, error)

MarshalJSON returns a JSON representation of this Attribute for serialisation.

func (*FloatAttribute) SetName

func (Attr *FloatAttribute) SetName(name string)

SetName sets this FloatAttribute's human-readable name.

func (*FloatAttribute) String

func (Attr *FloatAttribute) String() string

String returns a human-readable summary of this Attribute. e.g. "FloatAttribute(Sepal Width)"

func (*FloatAttribute) UnmarshalJSON

func (f *FloatAttribute) UnmarshalJSON(data []byte) error

UnmarshalJSON reads a JSON representation of this Attribute.

type FunctionalTarReader

type FunctionalTarReader struct {
	Regenerate func() *tar.Reader
}

FunctionalTarReader allows you to read anything in a tar file in any order, rather than just sequentially.

func NewFunctionalTarReader

func NewFunctionalTarReader(regenFunc func() *tar.Reader) *FunctionalTarReader

NewFunctionalTarReader creates a new FunctionalTarReader using a function that it can call to get a tar.Reader at the beginning of the file.

func (*FunctionalTarReader) GetNamedFile

func (f *FunctionalTarReader) GetNamedFile(name string) ([]byte, error)

GetNamedFile returns a file named a given thing from the tar file. If there's more than one entry, the most recent is returned.

type GoLearnError

type GoLearnError struct {
	WrappedError error
	CurrentStack string
	Description  string
}

func (*GoLearnError) Error

func (g *GoLearnError) Error() string

type InstancesView

type InstancesView struct {
	// contains filtered or unexported fields
}

InstancesViews hide or re-order Attributes and rows from a given DataGrid to make it appear that they've been deleted.

func NewInstancesViewFromAttrs

func NewInstancesViewFromAttrs(src FixedDataGrid, attrs []Attribute) *InstancesView

NewInstancesViewFromAttrs creates a new InstancesView from a source FixedDataGrid and a slice of Attributes.

Only the Attributes specified will appear in this InstancesView.

func NewInstancesViewFromRows

func NewInstancesViewFromRows(src FixedDataGrid, rows map[int]int) *InstancesView

NewInstancesViewFromRows creates a new InstancesView from a source FixedDataGrid and row -> row mapping. The key of the rows map is the row as it exists within this mapping: for example an entry like 5 -> 1 means that row 1 in src will appear at row 5 in the Instancesview.

Rows are not masked in this implementation, meaning that all rows which are left unspecified appear as normal.

func NewInstancesViewFromVisible

func NewInstancesViewFromVisible(src FixedDataGrid, rows []int, attrs []Attribute) *InstancesView

NewInstancesViewFromVisible creates a new InstancesView from a source FixedDataGrid, a slice of row numbers and a slice of Attributes.

Only the rows specified will appear in this InstancesView, and they will appear in the same order they appear within the rows array.

Only the Attributes specified will appear in this InstancesView. Retrieving Attribute specifications from this InstancesView will maintain their order.

func (*InstancesView) AddClassAttribute

func (v *InstancesView) AddClassAttribute(a Attribute) error

AddClassAttribute adds the given Attribute to the set of defined class Attributes, if it hasn't been filtered.

func (*InstancesView) AllAttributes

func (v *InstancesView) AllAttributes() []Attribute

AllAttributes returns every Attribute which hasn't been filtered.

func (*InstancesView) AllClassAttributes

func (v *InstancesView) AllClassAttributes() []Attribute

AllClassAttributes returns all the Attributes currently defined as being class Attributes.

func (*InstancesView) Get

func (v *InstancesView) Get(as AttributeSpec, row int) []byte

Get returns a sequence of bytes stored under a given Attribute on a given row.

IMPORTANT: The AttributeSpec is unverified, meaning it's possible to return values from Attributes filtered by this InstancesView if the underlying AttributeSpec is known.

func (*InstancesView) GetAttribute

func (v *InstancesView) GetAttribute(a Attribute) (AttributeSpec, error)

GetAttribute returns an Attribute specification matching an Attribute if it has not been filtered.

The AttributeSpecs returned are the same as those returned by the source FixedDataGrid.

func (*InstancesView) MapOverRows

func (v *InstancesView) MapOverRows(as []AttributeSpec, rowFunc func([][]byte, int) (bool, error)) error

MapOverRows, see DenseInstances.MapOverRows.

IMPORTANT: MapOverRows is not guaranteed to be ordered, but this one especially so.

func (*InstancesView) RemoveClassAttribute

func (v *InstancesView) RemoveClassAttribute(a Attribute) error

RemoveClassAttribute removes the given Attribute from the set of class Attributes.

func (*InstancesView) RowString

func (v *InstancesView) RowString(row int) string

RowString returns a string representation of a given row.

func (*InstancesView) Size

func (v *InstancesView) Size() (int, int)

Size Returns the number of Attributes and rows this InstancesView contains.

func (*InstancesView) String

func (v *InstancesView) String() string

String returns a human-readable summary of this InstancesView.

type LazilyFilteredInstances

type LazilyFilteredInstances struct {
	// contains filtered or unexported fields
}

LazilyFilteredInstances map a Filter over an underlying FixedDataGrid and are a memory-efficient way of applying them.

func NewLazilyFilteredInstances

func NewLazilyFilteredInstances(src FixedDataGrid, f Filter) *LazilyFilteredInstances

NewLazilyFitleredInstances returns a new FixedDataGrid after applying the given Filter to the Attributes it includes. Unfiltered Attributes are passed through without modification.

func (*LazilyFilteredInstances) AddClassAttribute

func (l *LazilyFilteredInstances) AddClassAttribute(cls Attribute) error

AddClassAttribute adds a given Attribute (either before or after filtering) to the set of defined class Attributes.

func (*LazilyFilteredInstances) AllAttributes

func (l *LazilyFilteredInstances) AllAttributes() []Attribute

AllAttributes returns every Attribute defined in the source datagrid, in addition to the revised Attributes created by the filter.

func (*LazilyFilteredInstances) AllClassAttributes

func (l *LazilyFilteredInstances) AllClassAttributes() []Attribute

AllClassAttributes returns details of all Attributes currently specified as being class Attributes.

If applicable, the Attributes returned are those after modification by the Filter.

func (*LazilyFilteredInstances) Get

func (l *LazilyFilteredInstances) Get(as AttributeSpec, row int) []byte

Get returns a transformed byte slice stored at a given AttributeSpec and row.

func (*LazilyFilteredInstances) GetAttribute

func (l *LazilyFilteredInstances) GetAttribute(target Attribute) (AttributeSpec, error)

GetAttribute returns an AttributeSpecification for a given Attribute

func (*LazilyFilteredInstances) MapOverRows

func (l *LazilyFilteredInstances) MapOverRows(asv []AttributeSpec, mapFunc func([][]byte, int) (bool, error)) error

MapOverRows maps an iteration mapFunc over the bytes contained in the source FixedDataGrid, after modification by the filter.

func (*LazilyFilteredInstances) RemoveClassAttribute

func (l *LazilyFilteredInstances) RemoveClassAttribute(cls Attribute) error

RemoveClassAttribute removes a given Attribute (either before or after filtering) from the set of defined class Attributes.

func (*LazilyFilteredInstances) RowString

func (l *LazilyFilteredInstances) RowString(row int) string

RowString returns a string representation of a given row after filtering.

func (*LazilyFilteredInstances) Size

func (l *LazilyFilteredInstances) Size() (int, int)

Size returns the number of Attributes and rows of the underlying FixedDataGrid.

func (*LazilyFilteredInstances) String

func (l *LazilyFilteredInstances) String() string

String returns a human-readable summary of this FixedDataGrid after filtering.

type Mat64Instances

type Mat64Instances struct {
	Data *mat.Dense
	// contains filtered or unexported fields
}

func InstancesFromMat64

func InstancesFromMat64(rows, cols int, data *mat.Dense) *Mat64Instances

InstancesFromMat64 returns a new Mat64Instances from a literal provided.

func (*Mat64Instances) AddClassAttribute

func (m *Mat64Instances) AddClassAttribute(a Attribute) error

AddClassAttribute adds an attribute to the class set.

func (*Mat64Instances) AllAttributes

func (m *Mat64Instances) AllAttributes() []Attribute

AllAttributes returns every defined Attribute.

func (*Mat64Instances) AllClassAttributes

func (m *Mat64Instances) AllClassAttributes() []Attribute

AllClassAttributes returns every class attribute.

func (*Mat64Instances) Get

func (m *Mat64Instances) Get(as AttributeSpec, row int) []byte

Get returns the bytes at a given position

func (*Mat64Instances) GetAttribute

func (m *Mat64Instances) GetAttribute(a Attribute) (AttributeSpec, error)

GetAttribute returns an AttributeSpec from an Attribute field.

func (*Mat64Instances) MapOverRows

func (m *Mat64Instances) MapOverRows(as []AttributeSpec, f func([][]byte, int) (bool, error)) error

MapOverRows is a convenience function for iteration

func (*Mat64Instances) RemoveClassAttribute

func (m *Mat64Instances) RemoveClassAttribute(a Attribute) error

RemoveClassAttribute removes an attribute to the class set.

func (*Mat64Instances) RowString

func (m *Mat64Instances) RowString(row int) string

RowString: should print the values of a row TODO: make this less half-assed

func (*Mat64Instances) Size

func (m *Mat64Instances) Size() (int, int)

Size returns the number of Attributes, then the number of rows

func (*Mat64Instances) String

func (m *Mat64Instances) String() string

String returns a human-readable summary of this dataset.

type Model

type Model interface {
	Score()
}

A Model is a supervised learning object, that is possible of scoring accuracy against a test set.

type Predictor

type Predictor interface {
	Predict()
}

A Predictor is an object that provides predictions.

type SortDirection

type SortDirection int

SortDirection specifies sorting direction...

const (
	// Descending says that Instances should be sorted high to low...
	Descending SortDirection = 1
	// Ascending states that Instances should be sorted low to high...
	Ascending SortDirection = 2
)

type UpdatableDataGrid

type UpdatableDataGrid interface {
	FixedDataGrid
	// Sets a given Attribute and row to a byte sequence.
	Set(AttributeSpec, int, []byte)
	// Adds an Attribute to the grid.
	AddAttribute(Attribute) AttributeSpec
	// Allocates additional room to hold a number of rows
	Extend(int) error
}

UpdatableDataGrid implementations can be changed in addition to implementing all of the functionality offered by FixedDataGrid implementations.

func GeneratePredictionVector

func GeneratePredictionVector(from FixedDataGrid) UpdatableDataGrid

GeneratePredictionVector selects the class Attributes from a given FixedDataGrid and returns something which can hold the predictions.

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