[Fix] Update gather model script

[ZCMax]

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Motivation

Please describe the motivation of this PR and the goal you want to achieve through this PR.

Modification

Update gather model script to keep in line with mmdetection

BC-breaking (Optional)

Does the modification introduce changes that break the back-compatibility of the downstream repos?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[codecov]

Codecov Report

Base: 49.96% // Head: 49.56% // Decreases project coverage by -0.40% ⚠️

Coverage data is based on head (064c4f3) compared to base (56acaf3).
Patch has no changes to coverable lines.

❗ Current head 064c4f3 differs from pull request most recent head 4a72d1f. Consider uploading reports for the commit 4a72d1f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1917      +/-   ##
==========================================
- Coverage   49.96%   49.56%   -0.41%     
==========================================
  Files         228      227       -1     
  Lines       19916    19708     -208     
  Branches     3187     3160      -27     
==========================================
- Hits         9952     9769     -183     
+ Misses       9374     9352      -22     
+ Partials      590      587       -3     

Flag	Coverage Δ
unittests	49.56% <ø> (-0.41%)	⬇️

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

Impacted Files	Coverage Δ
...3d/core/bbox/samplers/iou_neg_piecewise_sampler.py	20.25% <0.00%> (-1.00%)	⬇️
mmdet3d/models/roi_heads/point_rcnn_roi_head.py	25.96% <0.00%> (-0.71%)	⬇️
...odels/roi_heads/bbox_heads/point_rcnn_bbox_head.py	30.18% <0.00%> (-0.14%)	⬇️
mmdet3d/apis/inference.py	41.34% <0.00%> (ø)
mmdet3d/datasets/__init__.py	100.00% <0.00%> (ø)
mmdet3d/models/necks/__init__.py	100.00% <0.00%> (ø)
mmdet3d/datasets/pipelines/__init__.py	100.00% <0.00%> (ø)
mmdet3d/models/necks/view_transformer.py
mmdet3d/datasets/pipelines/transforms_3d.py	87.39% <0.00%> (+1.31%)	⬆️

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