dotnet / dotnet/machinelearning-samples

Missing initializer member in generated code

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Descrizione

Problem encountered on https://dotnet.microsoft.com/learn/machinelearning-ai/ml-dotnet-get-started-tutorial/generate-code
Operating System: windows

Provide details about the problem you are experiencing. Include your operating system version, exact error message, code sample, and anything else that is relevant.

In ModelBuilder.cs the function

> public static IEstimator BuildTrainingPipeline(MLContext mlContext)

the trining algorithm is missing a initializer member.
The code looks like this generated:

```
public static IEstimator BuildTrainingPipeline(MLContext mlContext)
{
// Data process configuration with pipeline data transformations
var dataProcessPipeline = mlContext.Transforms.Text.FeaturizeText("SentimentText_tf", "SentimentText")
.Append(mlContext.Transforms.CopyColumns("Features", "SentimentText_tf"))
.Append(mlContext.Transforms.NormalizeMinMax("Features", "Features"))
.AppendCacheCheckpoint(mlContext);

// Set the training algorithm
var trainer = mlContext.BinaryClassification.Trainers.SgdCalibrated(new SgdCalibratedTrainer.Options() {
L2Regularization = 5E-06f,
ConvergenceTolerance = 0,
0.01f, // < ----- LOOK HERE
NumberOfIterations = 10,
Shuffle = true,
LabelColumnName = "Sentiment",
FeatureColumnName = "Features" });
var trainingPipeline = dataProcessPipeline.Append(trainer);

return trainingPipeline;
}
```

I had a look at the documentation and figured that what was missing was this

```
public static IEstimator BuildTrainingPipeline(MLContext mlContext)
{
// Data process configuration with pipeline data transformations
var dataProcessPipeline = mlContext.Transforms.Text.FeaturizeText("SentimentText_tf", "SentimentText")
.Append(mlContext.Transforms.CopyColumns("Features", "SentimentText_tf"))
.Append(mlContext.Transforms.NormalizeMinMax("Features", "Features"))
.AppendCacheCheckpoint(mlContext);

// Set the training algorithm
var trainer = mlContext.BinaryClassification.Trainers.SgdCalibrated(new SgdCalibratedTrainer.Options() {
L2Regularization = 5E-06f,
ConvergenceTolerance = 0,
PositiveInstanceWeight = 0.01f, // <--- SEEMED TO DO THE TRICK
NumberOfIterations = 10,
Shuffle = true,
LabelColumnName = "Sentiment",
FeatureColumnName = "Features" });
var trainingPipeline = dataProcessPipeline.Append(trainer);

return trainingPipeline;
}
```

Also worth noting was that when the code was generated the value "0.01f" actually said "001f". I imagine it can have something to do with language setting on the computer perhaps.

EDIT: Similar problem as #444

Guida per i contributori

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Direzione di ricerca

Inizia dal punto di ingresso del tutorial di ML.NET e dal file ModelBuilder.cs generato, concentrandoti su BuildTrainingPipeline e sull'inizializzatore delle opzioni SgdCalibrated. Riproduci il codice generato su Windows, inclusa l'uscita segnalata 0.01f rispetto a 001f, e confrontalo con l'issue correlata #444. Il lavoro è completato quando l'inizializzatore generato è valido e il valore numerico viene emesso correttamente.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Valutazione

Stack tecnologico
csharp, machine-learning
Ambito
machine-learning
Tipo di issue
Bug
Difficoltà
3/5
Tempo stimato
1-2 giorni
Stato di attività
Ferma
Chiarezza
Abbastanza chiara
Idoneità per principianti
35/100

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