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import json, re, argparse, statistics
def approx_token_count(text: str) -> int:
if not text:
return 0
return len(re.findall(r"\w+|\S", text, flags=re.UNICODE))
def detect_text_field(obj):
for k in ["text", "function", "code", "content", "body"]:
if k in obj and isinstance(obj[k], str):
return k
str_fields = [(k, len(v)) for k, v in obj.items() if isinstance(v, str)]
if str_fields:
return max(str_fields, key=lambda x: x[1])[0]
return None
def main():
ap = argparse.ArgumentParser()
ap.add_argument("--input", required=True, help="input JSONL path")
ap.add_argument("--short_out", default="short.jsonl", help="output short JSONL")
ap.add_argument("--long_out", default="long.jsonl", help="output long JSONL")
args = ap.parse_args()
# First pass: detect field and collect lengths
detected_field = None
lengths = []
total = decode_errors = 0
with open(args.input, "r", encoding="utf-8") as f:
for line in f:
total += 1
line = line.strip()
if not line:
continue
try:
obj = json.loads(line)
except json.JSONDecodeError:
decode_errors += 1
continue
if detected_field is None:
detected_field = detect_text_field(obj) or "text"
lengths.append(approx_token_count(obj.get(detected_field, "")))
if not lengths:
raise SystemExit("No valid samples parsed from input.")
# Use median as threshold
threshold = int(statistics.median(lengths))
# Second pass: split
short_cnt = long_cnt = 0
with open(args.input, "r", encoding="utf-8") as f_in, \
open(args.short_out, "w", encoding="utf-8") as f_s, \
open(args.long_out, "w", encoding="utf-8") as f_l:
for line in f_in:
line = line.strip()
if not line:
continue
obj = json.loads(line)
L = approx_token_count(obj.get(detected_field, ""))
if L <= threshold:
f_s.write(json.dumps(obj, ensure_ascii=False) + "\n")
short_cnt += 1
else:
f_l.write(json.dumps(obj, ensure_ascii=False) + "\n")
long_cnt += 1
# Report
total_valid = short_cnt + long_cnt
print("==== Split Done ====")
print(f"Input: {args.input}")
print(f"Detected text field: {detected_field}")
print(f"Threshold (median approx tokens): {threshold}")
print(f"Counts: short={short_cnt}, long={long_cnt}, long_ratio={(long_cnt/total_valid if total_valid else 0):.2%}")
if __name__ == "__main__":
main()
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