ImageClassificationTrainer.EarlyStoppingMetric.Loss must have _bestMetricValue equal to Single.MaxValue in case of Loss metric

[MiroslavKabat]

System Information:

• Windows 10
• ML.NET v1.6.0
• .NET 5.0

Bug
ImageClassificationTrainer.EarlyStopping doesn't work with ImageClassificationTrainer.EarlyStoppingMetric.Loss

It stops training immediately after epoch is reaching patience.

I expect reason of that bug in line 250 in ImageClassificationTrainer.cs

_bestMetricValue = 0.0f; must be equal to Single.MaxValue in case of Loss metric and 0.0f for Accuracy metric.