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📝 CodeRabbit Chat: Update dataset blend preparation example #1929

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Merged
kevalmorabia97 merged 1 commit into from
Jul 6, 2026
Merged

📝 CodeRabbit Chat: Update dataset blend preparation example #1929

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4 changes: 3 additions & 1 deletion examples/dataset/prepare_data_blend.py
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Original file line number Diff line number Diff line change
Expand Up @@ -84,6 +84,8 @@ def _prepare_sources(
workers = min(32, os.cpu_count() or 1)
blend: list[tuple[float, str]] = [] # (weight, shared .bin/.idx path without extension)
allocated_tokens = 0
# Weights are relative, not required to sum to 100 (matching data_blend.txt semantics).
weight_sum = sum(float(source["weight"]) for source in sources)

for index, source in enumerate(sources):
weight = float(source["weight"])
Expand All @@ -92,7 +94,7 @@ def _prepare_sources(
elif index == len(sources) - 1:
source_tokens = total_tokens - allocated_tokens
else:
source_tokens = round(total_tokens * weight / 100)
source_tokens = round(total_tokens * weight / weight_sum)
allocated_tokens += source_tokens

dataset = source["hf_dataset"]
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