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modspec.go
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modspec.go
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package seafan
// modspec.go handles specifying the model
import (
"bufio"
"fmt"
"io"
"os"
"reflect"
"strconv"
"strings"
)
// Layer types
type Layer int
const (
Input Layer = 0 + iota
FC
DropOut
Target
)
//go:generate stringer -type=Layer
// Activation types
type Activation int
const (
Linear Activation = 0 + iota
Relu
LeakyRelu
Sigmoid
SoftMax
)
//go:generate stringer -type=Activation
// FCLayer has details of a fully connected layer
type FCLayer struct {
Size int
Bias bool
Act Activation
ActParm float64
// position int
}
// DOLayer specifies a dropout layer. It occurs in the graph after dense layer AfterLayer (the input layer is layer 0).
type DOLayer struct {
// position int // insert dropout after layer AfterLayer
DropProb float64 // dropout probability
}
// ModSpec holds layers--each slice element is a layer
type ModSpec []string
// Args map holds layer arguments in key/val style
type Args map[string]string
// MakeArgs takes an argument string of the form "arg1:val1, arg2:val2, ...." and returns entries in key/val format
func MakeArgs(s string) (keyval Args, err error) {
s = strings.ReplaceAll(strings.ReplaceAll(s, " ", ""), "\n", "")
err = nil
keyval = make(map[string]string)
if !strings.Contains(s, ":") {
return
}
entries := strings.Split(s, ",")
for _, entry := range entries {
if !strings.Contains(entry, ":") {
err = Wrapper(ErrModSpec, fmt.Sprintf("MakeArgs: bad keyval: %s", entry))
return
}
kv := strings.Split(entry, ":")
if len(kv) != 2 {
err = Wrapper(ErrModSpec, fmt.Sprintf("MakeArgs: bad keyval: %s", entry))
}
keyval[kv[0]] = kv[1]
}
return
}
// Get returns a val from Args coercing to type kind. Nil if fails.
func (kv Args) Get(key string, kind reflect.Kind) (val any) {
val = nil
valStr, ok := kv[key]
if !ok {
return nil
}
switch kind {
case reflect.Float64:
f, err := strconv.ParseFloat(valStr, 64)
if err != nil {
return
}
val = f
case reflect.Int:
i, err := strconv.ParseInt(valStr, 10, 32)
if err != nil {
return
}
val = int(i)
case reflect.String:
val = valStr
case reflect.Bool:
b, err := strconv.ParseBool(valStr)
if err != nil {
return
}
val = b
}
return val
}
// StrAct takes a string and returns corresponding Activation and any parameter. Nil if fails.
func StrAct(s string) (*Activation, float64) {
parm := float64(0)
// takes a parameter?
if strings.Contains(s, "(") {
l, parmStr, e := Strip(s)
if e != nil {
return nil, 0.0
}
var err error
parm, err = strconv.ParseFloat(parmStr, 64)
if err != nil {
return nil, 0.0
}
s = l
}
if i := strings.Index(strings.ToLower(_Activation_name), strings.ToLower(s)); i >= 0 {
for ind, ix := range _Activation_index {
if i == int(ix) {
act := Activation(ind)
return &act, parm
}
}
}
return nil, 0.0
}
// FCParse parses the arguments to an FC layer
func FCParse(s string) (fc *FCLayer, err error) {
fc = nil
kval, err := MakeArgs(strings.ToLower(s[3 : len(s)-1]))
if err != nil {
return
}
fc = &FCLayer{Act: Linear, Bias: true}
if val := kval.Get("size", reflect.Int); val != nil {
fc.Size = val.(int)
if fc.Size < 1 {
err = Wrapper(ErrModSpec, "FC: illegal size")
return
}
}
if val := kval.Get("activation", reflect.String); val != nil {
if a, p := StrAct(val.(string)); a != nil {
fc.Act = *a
fc.ActParm = p
}
}
if val := kval.Get("bias", reflect.Bool); val != nil {
fc.Bias = val.(bool)
}
return fc, err
}
// DropOutParse parses the arguments to a drop out layer
func DropOutParse(s string) (*DOLayer, error) {
_, args, err := Strip(s)
if err != nil {
return nil, err
}
p, err := strconv.ParseFloat(args, 64)
if err != nil {
return nil, err
}
if p <= 0.0 || p >= 1.0 {
return nil, Wrapper(ErrModSpec, "DropOut: bad dropout probability <=0, >=1")
}
do := &DOLayer{DropProb: p}
return do, nil
}
// Check checks that the layer name is valid
func (m ModSpec) Check() error {
for _, ms := range m {
l, _, e := Strip(ms)
if e != nil {
return e
}
if !strings.Contains(strings.ToLower(_Layer_name), strings.ToLower(l)) {
return Wrapper(ErrModSpec, fmt.Sprintf("unknown layer: %s", l))
}
}
return nil
}
// LType returns the layer type of layer i
func (m ModSpec) LType(i int) (*Layer, error) {
if e := m.Check(); e != nil {
return nil, e
}
if i < 0 || i >= len(m) {
return nil, Wrapper(ErrModSpec, "layer name error")
}
l, _, e := Strip(m[i])
if e != nil {
return nil, e
}
if i := strings.Index(strings.ToLower(_Layer_name), strings.ToLower(l)); i >= 0 {
for ind, ix := range _Layer_index {
if i == int(ix) {
lay := Layer(ind)
return &lay, nil
}
}
}
return nil, Wrapper(ErrModSpec, "layer error")
}
// DropOut returns the *DoLayer for layer i, if it is of type DropOut. Returns nil o.w.
func (m ModSpec) DropOut(loc int) *DOLayer {
l, e := m.LType(loc)
if e != nil {
return nil
}
if *l != DropOut {
return nil
}
do, err := DropOutParse(m[loc])
if err != nil {
return nil
}
return do
}
// FC returns the *FCLayer for layer i, if it is of type FC. Returns nil o.w.
func (m ModSpec) FC(loc int) *FCLayer {
l, e := m.LType(loc)
if e != nil {
return nil
}
if *l != FC {
return nil
}
fc, err := FCParse(m[loc])
if err != nil {
return nil
}
return fc
}
// Inputs returns the FTypes of the input features
func (m ModSpec) Inputs(p Pipeline) (FTypes, error) {
var err error
modSpec := make([]*FType, 0)
l, e := m.LType(0)
if e != nil {
return nil, e
}
if *l != Input {
return nil, Wrapper(ErrModSpec, "first layer is not Input")
}
_, inStr, e := Strip(m[0])
if e != nil {
return nil, e
}
var feat *FType
fs := strings.Split(inStr, "+")
for _, f := range fs {
ft := f
embCols := 0
if strings.Contains(f, "E(") || strings.Contains(f, "e(") {
l := strings.Split(ft, ",")
if len(l) != 2 {
return nil, Wrapper(ErrModSpec, "Inputs: parse error")
}
ft = l[0][2:]
var em int64
em, err = strconv.ParseInt(l[1][0:len(l[1])-1], 10, 32)
if err != nil {
return nil, err
}
if em <= 1 {
return nil, Wrapper(ErrModSpec, "embedding columns must be at least 2")
}
embCols = int(em)
}
feat = p.GetFType(ft)
if feat == nil {
return nil, Wrapper(ErrModSpec, fmt.Sprintf("Inputs: feature %s not found", f))
}
if feat.Role == FRCat {
return nil, Wrapper(ErrModSpec, fmt.Sprintf("feature %s is categorical--must convert to one-hot", feat.Name))
}
feat.EmbCols = embCols
if embCols > 0 {
if feat.Role != FROneHot && feat.Role != FREmbed {
return nil, Wrapper(ErrModSpec, fmt.Sprintf("feature %s can't be continuous/categorical", ft))
}
feat.Role = FREmbed
}
modSpec = append(modSpec, feat)
}
return modSpec, nil
}
func (m ModSpec) TargetName() string {
l, e := m.LType(len(m) - 1)
if e != nil {
return ""
}
if *l != Target {
return ""
}
_, arg, e := Strip(m[len(m)-1])
if e != nil {
return ""
}
return arg
}
// Target returns the *FType of the target
func (m ModSpec) Target(p Pipeline) (*FType, error) {
targetName := m.TargetName()
if targetName == "" {
return nil, fmt.Errorf("no target has been specified")
}
feat := p.GetFType(targetName)
if feat == nil {
return nil, Wrapper(ErrModSpec, fmt.Sprintf("feature %s not found", targetName))
}
return feat, nil
}
// Save ModSpec
func (m ModSpec) Save(fileName string) (err error) {
if err = m.Check(); err != nil {
return
}
f, err := os.Create(fileName)
if err != nil {
return
}
defer func() { _ = f.Close() }()
for ind := 0; ind < len(m); ind++ {
line := strings.ReplaceAll(strings.ReplaceAll(m[ind], " ", ""), "\n", "")
if _, err = f.WriteString(line + "\n"); err != nil {
return
}
}
return
}
// LoadModSpec loads a ModSpec from file
func LoadModSpec(fileName string) (ms ModSpec, err error) {
ms = make(ModSpec, 0)
f, err := os.Open(fileName)
if err != nil {
return
}
defer func() { _ = f.Close() }()
buf := bufio.NewReader(f)
for err != io.EOF {
var l []byte
l, err = buf.ReadBytes('\n')
if err != nil && err != io.EOF {
return nil, err
}
line := strings.ReplaceAll(string(l), "\n", "")
if line != "" {
ms = append(ms, line)
}
}
err = ms.Check()
return
}
// Strip is a utility that takes a string of the form "Func(args)" and returns "Func" and "args"
func Strip(s string) (left, inner string, err error) {
s = strings.ReplaceAll(strings.ReplaceAll(s, " ", ""), "\n", "")
il := strings.Index(s, "(")
if il <= 0 {
return "", "", Wrapper(ErrModSpec, "bad (")
}
if s[len(s)-1:] != ")" {
return "", "", Wrapper(ErrModSpec, "bad )")
}
left = s[0:il]
inner = s[il+1 : len(s)-1]
return
}