Is loss the same as accuracy?
No. Accuracy counts correct decisions, while a loss can measure confidence and error size. Two models with equal accuracy can have different losses.
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More FAQs in How does a loss function measure the quality of a model’s prediction?
Some objectives can produce negative numerical values, depending on their definition. Common squared-error and standard cross-entropy losses are nonnegative under their usual assumptions.
Validation loss measures fit on examples excluded from training updates. A growing gap between training and validation performance can indicate overfitting or distribution differences.
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