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input.go
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input.go
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package evaluation
import (
"fmt"
"github.com/pkg/errors"
"strconv"
"github.com/flukeish/pmml/models"
)
func handleConstantExpression(constExpr *models.Constant) (Value, error) {
if constExpr.DataType == models.DataTypeDouble {
v, err := strconv.ParseFloat(constExpr.Value, 64)
if err != nil {
return NewValue(nil), err
}
return NewValue(v), nil
}
return NewValue(nil), fmt.Errorf("unsupported data type: %s", constExpr.DataType)
}
func handleApplyExpression(apply *models.Apply, in DataRow, dd *models.DataDictionary, td *models.TransformationDictionary, lt *models.LocalTransformations, ms *models.MiningSchema) (Value, error) {
if apply.Function == "sum" {
s := 0.0
for _, child := range apply.Expressions {
child_val, err := HandleExpression(child, in, dd, td, lt, ms)
if err != nil {
return child_val, err
}
s += child_val.Float64()
}
return NewValue(s), nil
}
if apply.Function == "*" || apply.Function == "+" || apply.Function == "-" || apply.Function == "/" {
if len(apply.Expressions) != 2 {
return NewValue(nil), fmt.Errorf("function %s expects 2 arguments, found %d", apply.Function, len(apply.Expressions))
}
val1, err := HandleExpression(apply.Expressions[0], in, dd, td, lt, ms)
if err != nil {
return NewValue(nil), err
}
val2, err := HandleExpression(apply.Expressions[1], in, dd, td, lt, ms)
if err != nil {
return NewValue(nil), err
}
if apply.Function == "*" {
return NewValue(val1.Float64() * val2.Float64()), nil
}
if apply.Function == "+" {
return NewValue(val1.Float64() + val2.Float64()), nil
}
if apply.Function == "-" {
return NewValue(val1.Float64() - val2.Float64()), nil
}
if apply.Function == "/" {
return NewValue(val1.Float64() / val2.Float64()), nil
}
}
if apply.Function == "isMissing" {
if len(apply.Expressions) != 1 {
return NewValue(nil), fmt.Errorf("function %s expects 1 argument, found %d", apply.Function, len(apply.Expressions))
}
missing, err := isMissing(apply, in, dd, td, lt, ms)
if err != nil {
return NewValue(false), err
}
return NewValue(missing), nil
}
if apply.Function == "isNotMissing" {
if len(apply.Expressions) != 1 {
return NewValue(nil), fmt.Errorf("function %s expects 1 argument, found %d", apply.Function, len(apply.Expressions))
}
missing, err := isMissing(apply, in, dd, td, lt, ms)
if err != nil {
return NewValue(false), err
}
return NewValue(!missing), nil
}
if apply.Function == "if" {
if len(apply.Expressions) != 3 {
return NewValue(nil), fmt.Errorf("function %s expects 1 argument, found %d", apply.Function, len(apply.Expressions))
}
condition, err := HandleExpression(apply.Expressions[0], in, dd, td, lt, ms)
if err != nil {
return NewValue(nil), err
}
if condition.Bool() {
return HandleExpression(apply.Expressions[1], in, dd, td, lt, ms)
} else {
return HandleExpression(apply.Expressions[2], in, dd, td, lt, ms)
}
}
return NewValue(nil), fmt.Errorf("unsupported apply function: %s", apply.Function)
}
func isMissing(apply *models.Apply, in DataRow, dd *models.DataDictionary, td *models.TransformationDictionary, lt *models.LocalTransformations, ms *models.MiningSchema) (bool, error) {
if len(apply.Expressions) != 1 {
return true, fmt.Errorf("function %s expects 1 argument, found %d", apply.Function, len(apply.Expressions))
}
out, err := HandleExpression(apply.Expressions[0], in, dd, td, lt, ms)
if err != nil {
return true, err
}
if out.Raw() == nil {
return true, nil
}
return false, nil
}
func handleMapValuesExpression(expr *models.MapValues, in DataRow, dd *models.DataDictionary, td *models.TransformationDictionary, lt *models.LocalTransformations, ms *models.MiningSchema) (Value, error) {
columns := make(map[string]Value)
for _, pair := range expr.FieldColumnPairs {
data, ok := in[pair.Field]
if ok {
columns[pair.Column] = data
}
}
for _, mapping := range expr.InlineTables {
for _, row := range mapping.Rows {
if row["input"] == columns["data:input"].String() {
columns["data:output"] = NewValue(row["output"])
}
}
}
output, ok := columns["data:output"]
if ok {
return output, nil
}
if expr.DefaultValue != nil {
defaultValue, err := getRawValue(expr.DataType, *expr.DefaultValue)
if err != nil {
return NewValue(nil), err
}
return NewValue(defaultValue), nil
}
input, ok := columns["data:input"]
if ok {
return input, nil
}
return NewValue(nil), errors.New("unexpected expression")
}
func HandleExpression(expr models.Expression, in DataRow, dd *models.DataDictionary, td *models.TransformationDictionary, lt *models.LocalTransformations, ms *models.MiningSchema) (Value, error) {
fieldRef, ok := expr.(*models.FieldRef)
if ok {
return in[string(fieldRef.Field)], nil
}
constExpr, ok := expr.(*models.Constant)
if ok {
return handleConstantExpression(constExpr)
}
apply, ok := expr.(*models.Apply)
if ok {
return handleApplyExpression(apply, in, dd, td, lt, ms)
}
mapExpr, ok := expr.(*models.MapValues)
if ok {
return handleMapValuesExpression(mapExpr, in, dd, td, lt, ms)
}
return NewValue(nil), fmt.Errorf("unsupported transformation: %T", expr)
}
func HandleInput(in DataRow, dd *models.DataDictionary, td *models.TransformationDictionary, lt *models.LocalTransformations, ms *models.MiningSchema) (DataRow, error) {
for _, df := range lt.DerivedFields {
expr_val, err := HandleExpression(df.Expression, in, dd, td, lt, ms)
if err != nil {
return nil, err
}
if df.OpType == models.OpTypeContinuous {
in[df.Name] = NewValue(expr_val.Float64())
} else {
in[df.Name] = expr_val
}
}
err := validate(in, ms)
if err != nil {
return nil, err
}
return in, nil
}
func validate(in DataRow, ms *models.MiningSchema) error {
if ms == nil {
return nil
}
return nil
}