transaction data from DFETC

All historical buyer purchase information is completely stored in the database at the DFETC. We extract the transaction data for June–October 2019 from the database for model training and evaluation.所有历史买方采购信息均完整存储于DFETC的数据库中。我们从该数据库中提取2019年6月至10月的交易数据，用于模型训练与评估。