1Z0-1127-25 OCI Generative AI Service Practice Question
During fine-tuning a model using T-Few in OCI Generative AI, the job fails with a 'dataset format error'. The training dataset is a JSONL file. Which of the following is the MOST likely cause?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Some lines have an extra 'metadata' key
Each JSONL line must contain exactly 'prompt' and 'completion' keys. Extra keys or missing keys cause format errors.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The file contains more than 1000 lines
Why it's wrong here
There is no line count limit causing format errors.
- ✓
Some lines have an extra 'metadata' key
Why this is correct
The dataset format expects only 'prompt' and 'completion'. Extra keys like 'metadata' are not allowed and cause validation errors.
- ✗
The completion field contains more than 1024 tokens
Why it's wrong here
While long completions may cause truncation, they do not produce a format error.
- ✗
The file uses Unix line endings
Why it's wrong here
Unix line endings are standard and acceptable.
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