How do I specify a test dataset for gpt-3.5-turbo fine tuning?

The docs mention that it’s possible to input a test dataset, but there is not guidance on syntax.

Train and test splits
After collecting the initial dataset, we recommend splitting it into a training and test portion. When submitting a fine-tuning job with both training and test files, we will provide statistics on both during the course of training. These statistics will be your initial signal of how much the model is improving. Additionally, constructing a test set early on will be useful in making sure you are able to evaluate the model after training, by generating samples on the test set.

oops, it’s here: OpenAI Platform

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