acc 一直为0

[morganxxy]

[2022/02/01 02:44:47] root INFO: Initialize indexs of datasets:['./train_data/icdar2015/rec/rec_gt_train.txt'] [2022/02/01 02:45:27] root INFO: epoch: [72/72], iter: 1210, lr: 0.000500, loss: 12.991964, acc: 0.000000, norm_edit_dis: 0.191179, reader_cost: 0.01108 s, batch_cost: 3.96660 s, samples: 1024, ips: 25.81553 [2022/02/01 02:47:05] root INFO: epoch: [72/72], iter: 1220, lr: 0.000500, loss: 12.832106, acc: 0.000000, norm_edit_dis: 0.191746, reader_cost: 0.00008 s, batch_cost: 9.80384 s, samples: 2560, ips: 26.11220 [2022/02/01 02:47:34] root INFO: epoch: [72/72], iter: 1223, lr: 0.000500, loss: 12.811464, acc: 0.000000, norm_edit_dis: 0.192953, reader_cost: 0.00002 s, batch_cost: 2.93707 s, samples: 768, ips: 26.14855

环境:mac
系统:12.0.1
命令: python3 tools/train.py -c configs/rec/rec_icdar15_train.yml

看到有人提了类似的问题但是没有给出解决方案