Update statement for loading checkpoint from ultralytics

[zhiqwang]

This is a subsequent PR of #167 .

[codecov]

Codecov Report

Merging #169 (8b578bd) into master (410f862) will not change coverage.
The diff coverage is n/a.

❗ Current head 8b578bd differs from pull request most recent head 9943a57. Consider uploading reports for the commit 9943a57 to get more accurate results

@@           Coverage Diff           @@
##           master     #169   +/-   ##
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  Coverage   96.16%   96.16%           
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  Files          10       10           
  Lines         600      600           
=======================================
  Hits          577      577           
  Misses         23       23           

Flag	Coverage Δ
unittests	96.16% <ø> (ø)

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