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Fix perplexity calculation and resulting overcompression #208

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Fix perplexity calculation and resulting overcompression #208

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9 changes: 7 additions & 2 deletions llmlingua/prompt_compressor.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1702,14 +1702,19 @@ def iterative_compress_prompt(

for delta_end, ratio in iterative_ratios[idx]:
loss = past_loss
seg_end = end - iterative_size + delta_end + 1
if seg_end < iterative_size:
seg_end = iterative_size
seg_start = seg_end - iterative_size
if condition_compare:
self_loss = self_past_loss
self_seg_start, self_seg_end = seg_start - start, seg_end - start
threshold = self.get_estimate_threshold_base_distribution(
self_loss[: loss[start:].shape[0]] - loss[start:], ratio, False
self_loss[self_seg_start:self_seg_end] - loss[seg_start:seg_end], ratio, False
)
else:
threshold = self.get_estimate_threshold_base_distribution(
loss, ratio, False
loss[seg_start:seg_end], ratio, False
)

(
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