[🐛BUG] 有个空指针异常能帮忙看看吗？

[alittlebitcool]

总是报错这个问题：
Traceback (most recent call last):
File "/home/izuna/zyx/RecBole-GNN-main/run_recbole_gnn.py", line 19, in
run_recbole_gnn(model=args.model, dataset=args.dataset, config_file_list=config_file_list)
File "/home/izuna/zyx/RecBole-GNN-main/recbole_gnn/quick_start.py", line 48, in run_recbole_gnn
best_valid_score, best_valid_result = trainer.fit(
File "/home/izuna/zyx/rec/recbole/trainer/trainer.py", line 466, in fit
valid_score, valid_result = self._valid_epoch(
File "/home/izuna/zyx/rec/recbole/trainer/trainer.py", line 285, in _valid_epoch
valid_result = self.evaluate(
File "/opt/miniconda/envs/bole/lib/python3.10/site-packages/torch/autograd/grad_mode.py", line 27, in decorate_context
return func(*args, **kwargs)
File "/home/izuna/zyx/rec/recbole/trainer/trainer.py", line 618, in evaluate
interaction, scores, positive_u, positive_i = eval_func(batched_data)
File "/home/izuna/zyx/rec/recbole/trainer/trainer.py", line 556, in _neg_sample_batch_eval
batch_user_num = positive_u[-1] + 1
TypeError: 'NoneType' object is not subscriptable

我的配置文件如下：
embedding_size: 64
leakyrelu_alpha: 0.2
dropout_local: 0.
dropout_global: 0.5
dropout_gcn: 0.
loss_type: CE
gnn_transform: sess_graph

global

build_global_graph: True
sample_num: 12
hop: 1
field: ~

topk: [10, 20, 30, 40, 50, 60, 70, 80, 90, 100]
use_gpu: True
gpu_id: 0 # 根据实际情况设置 GPU 设备编号
seed: 2

dataset config

field_separator: " " #指定数据集field的分隔符
seq_separator: " " #指定数据集中token_seq或者float_seq域里的分隔符
USER_ID_FIELD: user_id #指定用户id域
ITEM_ID_FIELD: item_id #指定物品id域
RATING_FIELD: rating #指定打分rating域
#指定从什么文件里读什么列，这里就是从ml-1m.inter里面读取user_id, item_id, rating, timestamp这四列
load_col:
inter: [user_id, item_id, timestamp, rating]
TIME_FIELD: timestamp

training settings

#epochs: 2000 #训练的最大轮数
epochs: 2000 #训练的最大轮数
train_batch_size: 2048
learner: adam #使用的pytorch内置优化器
learning_rate: 0.01 #学习率
training_neg_sample_num: 0 #负采样数目
LABEL_FIELD: label #指定标签域
eval_type: 2

[konglongbaka]

我最近也是遇到了这个问题，请问你解决了吗，我是在复现SRGNN和LESSR时会有