feat(helper): add batch_size to embed fn

[hanxiao]

No description provided.

[codecov]

Codecov Report

Merging #183 (7af5cd8) into main (7e9c04f) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #183   +/-   ##
=======================================
  Coverage   86.45%   86.45%           
=======================================
  Files          25       25           
  Lines        1211     1211           
=======================================
  Hits         1047     1047           
  Misses        164      164           

Flag	Coverage Δ
finetuner	86.45% <100.00%> (ø)

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Impacted Files	Coverage Δ
finetuner/embedding.py	100.00% <100.00%> (ø)

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