137 lines
4.1 KiB
Go
137 lines
4.1 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"fmt"
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"log"
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"net/http"
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"os"
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"path/filepath"
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"strings"
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"google.golang.org/api/googleapi"
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prediction "google.golang.org/api/prediction/v1.6"
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)
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func init() {
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scopes := []string{
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prediction.DevstorageFullControlScope,
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prediction.DevstorageReadOnlyScope,
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prediction.DevstorageReadWriteScope,
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prediction.PredictionScope,
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}
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registerDemo("prediction", strings.Join(scopes, " "), predictionMain)
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}
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type predictionType struct {
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api *prediction.Service
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projectNumber string
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bucketName string
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trainingFileName string
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modelName string
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}
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// This example demonstrates calling the Prediction API.
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// Training data is uploaded to a pre-created Google Cloud Storage Bucket and
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// then the Prediction API is called to train a model based on that data.
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// After a few minutes, the model should be completely trained and ready
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// for prediction. At that point, text is sent to the model and the Prediction
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// API attempts to classify the data, and the results are printed out.
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//
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// To get started, follow the instructions found in the "Hello Prediction!"
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// Getting Started Guide located here:
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// https://developers.google.com/prediction/docs/hello_world
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//
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// Example usage:
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// go-api-demo -clientid="my-clientid" -secret="my-secret" prediction
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// my-project-number my-bucket-name my-training-filename my-model-name
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//
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// Example output:
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// Predict result: language=Spanish
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// English Score: 0.000000
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// French Score: 0.000000
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// Spanish Score: 1.000000
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// analyze: output feature text=&{157 English}
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// analyze: output feature text=&{149 French}
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// analyze: output feature text=&{100 Spanish}
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// feature text count=406
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func predictionMain(client *http.Client, argv []string) {
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if len(argv) != 4 {
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fmt.Fprintln(os.Stderr,
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"Usage: prediction project_number bucket training_data model_name")
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return
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}
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api, err := prediction.New(client)
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if err != nil {
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log.Fatalf("unable to create prediction API client: %v", err)
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}
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t := &predictionType{
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api: api,
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projectNumber: argv[0],
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bucketName: argv[1],
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trainingFileName: argv[2],
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modelName: argv[3],
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}
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t.trainModel()
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t.predictModel()
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}
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func (t *predictionType) trainModel() {
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// First, check to see if our trained model already exists.
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res, err := t.api.Trainedmodels.Get(t.projectNumber, t.modelName).Do()
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if err != nil {
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if ae, ok := err.(*googleapi.Error); ok && ae.Code != http.StatusNotFound {
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log.Fatalf("error getting trained model: %v", err)
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}
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log.Printf("Training model not found, creating new model.")
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res, err = t.api.Trainedmodels.Insert(t.projectNumber, &prediction.Insert{
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Id: t.modelName,
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StorageDataLocation: filepath.Join(t.bucketName, t.trainingFileName),
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}).Do()
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if err != nil {
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log.Fatalf("unable to create trained model: %v", err)
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}
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}
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if res.TrainingStatus != "DONE" {
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// Wait for the trained model to finish training.
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fmt.Printf("Training model. Please wait and re-run program after a few minutes.")
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os.Exit(0)
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}
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}
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func (t *predictionType) predictModel() {
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// Model has now been trained. Predict with it.
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input := &prediction.Input{
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Input: &prediction.InputInput{
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CsvInstance: []interface{}{
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"Hola, con quien hablo",
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},
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},
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}
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res, err := t.api.Trainedmodels.Predict(t.projectNumber, t.modelName, input).Do()
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if err != nil {
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log.Fatalf("unable to get trained prediction: %v", err)
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}
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fmt.Printf("Predict result: language=%v\n", res.OutputLabel)
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for _, m := range res.OutputMulti {
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fmt.Printf("%v Score: %v\n", m.Label, m.Score)
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}
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// Now analyze the model.
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an, err := t.api.Trainedmodels.Analyze(t.projectNumber, t.modelName).Do()
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if err != nil {
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log.Fatalf("unable to analyze trained model: %v", err)
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}
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for _, f := range an.DataDescription.OutputFeature.Text {
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fmt.Printf("analyze: output feature text=%v\n", f)
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}
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for _, f := range an.DataDescription.Features {
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fmt.Printf("feature text count=%v\n", f.Text.Count)
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}
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}
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