# SFTTrainer Data collators

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**Category:** Beginners\
**Created:** [April 28, 2024, 1:17pm UTC](/static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Ft%2Fsfttrainer-data-collators%2F84180 "2024-04-28T13:17:47Z")\
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**Author:** ![ZeyadMahmoud](https://avatars.discourse-cdn.com/v4/letter/z/4bbf92/32.png) [@ZeyadMahmoud](/static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Fu%2FZeyadMahmoud)%5C
**Post date:** [April 28, 2024, 1:17pm UTC](/static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Ft%2Fsfttrainer-data-collators%2F84180%2F1 "2024-04-28T13:17:47Z")

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I have a task in which I am using SFTTrainer for and I want to test performance using different data collators. I have a couple of questions:

1. What is the default data collator used by SFTTrainer when not using collator parameter.
2. I found in the documentation that DataCollatorForCompletionsOnly compute loss on response only, how I make sure if the other collators do the same.