with INPUT_PATH.open(newline="") as handle:
    reader = csv.DictReader(handle)
    expected_columns = [ID_COLUMN, *FEATURE_COLUMNS]
    if reader.fieldnames != expected_columns:
        raise ValueError(f"Expected CSV columns: {expected_columns}")
    input_rows = list(reader)

if not input_rows:
    raise ValueError("The input CSV has no data rows")