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vec.go
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vec.go
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package seafan
import (
"fmt"
"reflect"
G "gorgonia.org/gorgonia"
"gorgonia.org/tensor"
)
type VecData struct {
bs int // batch size
cbRow int // current batch starting row
nRow int // # rows in dataset
data *GData // processed data
epochCount int // current epoch
ftypes FTypes // user input selections
callback Opts // user callbacks executed at the start of Init()
keepRaw bool // if true, *Raw data is retained
name string // pipeline name
}
func NewVecData(name string, data *GData, opts ...Opts) *VecData {
vec := &VecData{bs: 1, data: data, name: name}
vec.nRow = vec.data.data[0].Summary.NRows
for _, gd := range vec.data.data {
vec.ftypes = append(vec.ftypes, gd.FT)
}
for _, o := range opts {
o(vec)
}
return vec
}
// VecFromAny builds a pipeline for a slice of vectors ([]any). The first dimension is the field.
func VecFromAny(data [][]any, fields []string, ftypes FTypes) (pipe Pipeline, err error) {
gd := NewGData()
for ind, field := range fields {
raw := NewRaw(data[ind], nil)
role := FRCts
if raw.Kind == reflect.String || raw.Kind == reflect.Struct {
role = FRCat
}
if ft := ftypes.Get(field); ft != nil {
if role != FRCat && role != FRCts {
return nil, fmt.Errorf("must be FRCat or FRCts, field %s is not VecFromAny", field)
}
role = ft.Role
}
if role == FRCat {
if e := gd.AppendD(raw, field, nil, true); e != nil {
return nil, e
}
continue
}
if e := gd.AppendC(raw, field, false, nil, true); e != nil {
return nil, e
}
}
pipe = NewVecData("values", gd)
return pipe, nil
}
func (vec *VecData) GetKeepRaw() bool {
return vec.keepRaw
}
func (vec *VecData) Slice(sl Slicer) (Pipeline, error) {
gOut, e := vec.data.Slice(sl)
if e != nil {
return nil, Wrapper(e, "*VecData.Slice")
}
name := fmt.Sprintf("sliced from %s", vec.name)
outPipe := NewVecData(name, gOut)
WithKeepRaw(vec.keepRaw)(outPipe)
return outPipe, nil
}
func (vec *VecData) Init() error {
vec.cbRow = 0
if vec.bs == 0 {
vec.bs = vec.Rows()
}
return nil
}
func (vec *VecData) Batch(inputs G.Nodes) bool {
// out of data? if NRows % bsize !=0, rows after the last full batvec are unused.
if vec.cbRow+vec.bs > vec.nRow {
vec.cbRow = 0
// user callbacks
if vec.callback != nil {
vec.callback(vec)
}
return false
}
startRow := vec.cbRow
endRow := startRow + vec.bs
for _, nd := range inputs {
var t tensor.Tensor
d := vec.data.Get(nd.Name())
if d == nil {
panic(Wrapper(ErrVecData, fmt.Sprintf("feature %s not in dataset", nd.Name())))
}
switch d.FT.Role {
case FRCts:
t = tensor.New(tensor.WithBacking(d.Data.([]float64)[startRow:endRow]), tensor.WithShape(vec.bs, 1))
case FRCat:
t = tensor.New(tensor.WithBacking(d.Data.([]int32)[startRow:endRow]), tensor.WithShape(vec.bs, 1))
case FROneHot, FREmbed:
sr := startRow * d.FT.Cats
er := endRow * d.FT.Cats
t = tensor.New(tensor.WithBacking(d.Data.([]float64)[sr:er]), tensor.WithShape(vec.bs, d.FT.Cats))
}
if e := G.Let(nd, t); e != nil {
panic(e)
}
}
vec.cbRow = endRow
return true
}
// Rows is # of rows of data in the Pipeline
func (vec *VecData) Rows() int {
return vec.nRow
}
// GetFTypes returns FTypes for vec Pipeline.
func (vec *VecData) GetFTypes() FTypes {
if vec.data == nil {
return nil
}
return vec.data.GetFTypes()
}
// SaveFTypes saves the FTypes for the Pipeline.
func (vec *VecData) SaveFTypes(fileName string) error {
return Wrapper(vec.GetFTypes().Save(fileName), "(*VecData).SaveFTypes")
}
// IsNormalized returns true if the field is normalized.
func (vec *VecData) IsNormalized(field string) bool {
if ft := vec.Get(field); ft != nil {
return ft.FT.Normalized
}
return false
}
// IsCts returns true if the field has role FRCts.
func (vec *VecData) IsCts(field string) bool {
if ft := vec.Get(field); ft != nil {
return ft.FT.Role == FRCat
}
return false
}
// IsCat returns true if field has role FRCat.
func (vec *VecData) IsCat(field string) bool {
if ft := vec.Get(field); ft != nil {
return ft.FT.Role == FRCat
}
return false
}
// GData returns the Pipelines' GData
func (vec *VecData) GData() *GData {
d := vec.data
return d
}
// Get returns a fields's GDatum
func (vec *VecData) Get(field string) *GDatum {
return vec.data.Get(field)
}
// Cols returns the # of columns in the field
func (vec *VecData) Cols(field string) int {
d := vec.Get(field)
if d == nil {
return 0
}
switch d.FT.Role {
case FRCts:
return 1
case FRCat:
return 1
case FROneHot, FREmbed:
return d.FT.Cats
}
return 0
}
// Epoch sets the epoch to setTo if setTo >=0 and returns epoch #.
func (vec *VecData) Epoch(setTo int) int {
if setTo >= 0 {
vec.epochCount = setTo
}
return vec.epochCount
}
// FieldList returns a slice of field names in the Pipeline
func (vec *VecData) FieldList() []string {
fl := make([]string, 0)
for _, ft := range vec.data.data {
fl = append(fl, ft.FT.Name)
}
return fl
}
// GetFType returns the fields FType
func (vec *VecData) GetFType(field string) *FType {
if vec.data == nil {
return nil
}
return vec.data.GetFType(field)
}
// Name returns Pipeline name
func (vec *VecData) Name() string {
return vec.name
}
// BatchSize returns Pipeline batch size
func (vec *VecData) BatchSize() int {
return vec.bs
}
// Describe describes a field. If the field has role FRCat, the top k values (by frequency) are returned.
func (vec *VecData) Describe(field string, topK int) string {
d := vec.Get(field)
if d == nil {
return ""
}
return d.Describe(topK)
}
func (vec *VecData) String() string {
const numCats = 5
str := fmt.Sprintf("Summary for pipeline %s\n", vec.Name())
fl := vec.FieldList()
str = fmt.Sprintf("%s%d fields\n", str, len(fl))
for _, f := range fl {
ff := vec.Describe(f, numCats)
str += ff
}
return str
}
// Shuffle shuffles the data.
func (vec *VecData) Shuffle() {
vec.data.Shuffle()
}
// Sort sorts the data on "field".
func (vec *VecData) Sort(field string, ascending bool) error {
e := vec.data.Sort(field, ascending)
if e != nil {
return Wrapper(e, "(*ChData) Sort")
}
return nil
}
// IsSorted returns true if the data has been sorted.
func (vec *VecData) IsSorted() bool {
return vec.data.IsSorted()
}
// SortField returns the name of the sort field.
func (vec *VecData) SortField() string {
return vec.data.SortField()
}
// Row creates a new pipeline with only the row, take
func (vec *VecData) Row(take int) (newPipe Pipeline, err error) {
var gdNew *GData
if gdNew, err = vec.GData().Row(take); err != nil {
return nil, err
}
newPipe = NewVecData("new pipe", gdNew)
WithKeepRaw(vec.keepRaw)(newPipe)
return newPipe, nil
}
// FieldCount returns the number of fields in the pipeline
func (vec *VecData) FieldCount() int {
return vec.data.FieldCount()
}
// Subset creates a new pipeline with only the rows, rows
func (vec *VecData) Subset(rows []int) (newPipe Pipeline, err error) {
var gdNew *GData
if gdNew, err = vec.GData().Subset(rows); err != nil {
return nil, err
}
newPipe = NewVecData("new pipe", gdNew)
WithKeepRaw(vec.keepRaw)(newPipe)
return newPipe, nil
}
// Where creates a new pipeline with rows where field is in equalTo. The comparison uses the *Raw data.
func (vec *VecData) Where(field string, equalTo []any) (newPipe Pipeline, err error) {
var gdNew *GData
if gdNew, err = vec.GData().Where(field, equalTo); err != nil {
return nil, err
}
newPipe = NewVecData("new pipe", gdNew)
WithKeepRaw(vec.keepRaw)(newPipe)
return newPipe, nil
}
// Keep keeps only the listed fields in the pipeline
func (vec *VecData) Keep(fields []string) error {
return vec.GData().Keep(fields)
}
// Drop drops the listed field from the pipeline
func (vec *VecData) Drop(field string) error {
return vec.GData().Drop(field)
}
// AppendRows appends rows to the existing GData and then re-initializes each GDatum, using the fTypes, if provided.
func (vec *VecData) AppendRows(gd *GData, fTypes FTypes) (pipeOut Pipeline, err error) {
gdOut, e := vec.GData().AppendRows(gd, fTypes)
if e != nil {
return nil, e
}
pipeOut = NewVecData("out", gdOut)
WithKeepRaw(vec.keepRaw)(pipeOut)
return pipeOut, nil
}
// AppendRowsRaw simply appends rows, in place, to the existing GData. Only the *Raw data is updated.
// The .Data field is set to nil.
func (vec *VecData) AppendRowsRaw(gd *GData) error {
vec.nRow += gd.rows
return vec.GData().AppendRowsRaw(gd)
}
// ReInit re-initializes the Data field from Raw for each GDatum. If ftypes is not nil, these values
// are used, otherwise the FParam values are re-derived from the data. A new pipeline is returned.
func (vec *VecData) ReInit(ftypes *FTypes) (pipeOut Pipeline, err error) {
var gdNew *GData
if gdNew, err = vec.GData().ReInit(ftypes); err != nil {
return nil, err
}
pipeOut = NewVecData("new", gdNew)
WithKeepRaw(vec.keepRaw)(pipeOut)
return pipeOut, nil
}
func (vec *VecData) Join(right Pipeline, onField string, joinType JoinType) (result Pipeline, err error) {
gdResult, e := vec.data.Join(right.GData(), onField, joinType)
if e != nil {
return nil, e
}
result = NewVecData("joined", gdResult)
WithKeepRaw(vec.keepRaw)(result)
return result, nil
}