AttributeError: module 'numpy' has no attribute 'int64'

[wwcc1107]

No description provided.

[wwcc1107]

python /home/mmdetection/tools/featuremap_analyze.py /home/mmdetection/configs/yolo/yolov3_mobilenetv2_320_300e_coco.py /home/mmdetection/mmdetection/checkpoints/retinanet_r50_fpn_1x_coco_20200130-c2398f9e.pth --img_dir /home/mmdetection/demo/demo --output_dir /home/mmdetection/Dataset/dir

when i want to use it in mmdetection ,there is an error.

Error:
Traceback (most recent call last):
File "/home/wangchang2/mmdetection/mmdetection/tools/featuremap_analyze.py", line 5, in
import cv2
File "/home/wangchang2/anaconda3/envs/mmdeploy/lib/python3.7/site-packages/cv2/init.py", line 11, in
import numpy
File "/home/wangchang2/anaconda3/envs/mmdeploy/lib/python3.7/site-packages/numpy/init.py", line 138, in
from ._version import get_versions
File "/home/wangchang2/anaconda3/envs/mmdeploy/lib/python3.7/site-packages/numpy/_version.py", line 7, in
import json
File "/home/wangchang2/mmdetection/mmdetection/tools/json.py", line 5, in
import mmcv
File "/home/wangchang2/anaconda3/envs/mmdeploy/lib/python3.7/site-packages/mmcv/init.py", line 3, in
from .arraymisc import *
File "/home/wangchang2/anaconda3/envs/mmdeploy/lib/python3.7/site-packages/mmcv/arraymisc/init.py", line 2, in
from .quantization import dequantize, quantize
File "/home/wangchang2/anaconda3/envs/mmdeploy/lib/python3.7/site-packages/mmcv/arraymisc/quantization.py", line 5, in
def quantize(arr, min_val, max_val, levels, dtype=np.int64):
AttributeError: module 'numpy' has no attribute 'int64'

[wwcc1107]

just lower numpy to 1.19.0,it works