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Truncate LLM output to exactly N sentences and fall back to a known-good baseline string when output is empty or too short
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| name | llm-sentence-truncation-fallback |
| description | Truncate LLM output to exactly N sentences and fall back to a known-good baseline string when output is empty or too short |
LLM outputs for structured tasks (prompt recovery, classification rationale, single-line answers) often include unwanted preamble, repetition, or rambling. Truncate to the first N sentences, then check length — if the result is too short or empty, substitute a well-scoring baseline string. This two-step post-processing ensures consistent submission quality.
import re
BASELINE = "Improve the following text using a more formal and academic tone while maintaining the original meaning"
def truncate_sentences(text, max_sentences=1):
sentences = re.split(r'(?<=[.!?])\s+', text.strip())
result = ' '.join(sentences[:max_sentences])
return result
def postprocess(raw_output, min_length=15):
cleaned = truncate_sentences(raw_output, max_sentences=1)
cleaned = cleaned.strip().strip('"').strip("'")
if len(cleaned) < min_length:
return BASELINE
return cleaned
predictions = [postprocess(output) for output in raw_outputs]