Some questions about python train.py CornerNet

[realNjupt]

When run python train.py CornerNet, it's wrong：

loading all datasets...
using 4 threads
loading from cache file: ./cache/coco_trainval2014.pkl
No cache file found...
loading annotations into memory...
Done (t=11.66s)
creating index...
index created!
118287it [00:47, 2514.57it/s]
loading annotations into memory...
Done (t=12.07s)
creating index...
index created!
loading from cache file: ./cache/coco_trainval2014.pkl
loading annotations into memory...
Done (t=17.86s)
creating index...
index created!
loading from cache file: ./cache/coco_trainval2014.pkl
loading annotations into memory...
Done (t=50.14s)
creating index...
index created!
Traceback (most recent call last):
File "train.py", line 185, in
training_dbs = [datasets[dataset](configs["db"], train_split) for _ in range(threads)]
File "train.py", line 185, in
training_dbs = [datasets[dataset](configs["db"], train_split) for _ in range(threads)]
File "/home/xsc/CornerNet/db/coco.py", line 69, in init
self._load_coco_data()
File "/home/xsc/CornerNet/db/coco.py", line 85, in _load_coco_data
data = json.load(f)
File "/home/xsc/anaconda3/envs/CornerNet/lib/python3.6/json/init.py", line 296, in load
return loads(fp.read(),
File "/home/xsc/anaconda3/envs/CornerNet/lib/python3.6/codecs.py", line 321, in decode
(result, consumed) = self._buffer_decode(data, self.errors, final)
MemoryError
Does anyone know what's going on？