[Fix]fix browse dataset and mmcv max version

[VVsssssk]

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Motivation

fix browse dataset and mmcv max version.Refer to pr#1277..

Modification

fix browse dataset script and mmcv max version.

[codecov]

Codecov Report

Merging #1376 (bf049a0) into dev (f747daa) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev    #1376      +/-   ##
==========================================
+ Coverage   51.19%   51.21%   +0.02%     
==========================================
  Files         212      212              
  Lines       18391    18276     -115     
  Branches     3008     2977      -31     
==========================================
- Hits         9415     9360      -55     
+ Misses       8420     8359      -61     
- Partials      556      557       +1     

Flag	Coverage Δ
unittests	51.21% <100.00%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmdet3d/__init__.py	81.48% <100.00%> (ø)
mmdet3d/apis/inference.py	41.66% <0.00%> (-2.23%)	⬇️

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