fix: cast dtype for fp16

[codecov[bot]]

Codecov Report

Merging #801 (a72b3fd) into main (65032f0) will increase coverage by 2.31%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #801      +/-   ##
==========================================
+ Coverage   81.50%   83.81%   +2.31%     
==========================================
  Files          21       21              
  Lines        1438     1440       +2     
==========================================
+ Hits         1172     1207      +35     
+ Misses        266      233      -33     

Flag	Coverage Δ
cas	83.81% <100.00%> (+2.31%)	:arrow_up:

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Impacted Files	Coverage Δ
client/clip_client/__init__.py	100.00% <100.00%> (ø)
server/clip_server/__init__.py	100.00% <100.00%> (ø)
server/clip_server/model/model.py	78.92% <100.00%> (+0.09%)	:arrow_up:
server/clip_server/model/clip_trt.py	85.71% <0.00%> (+16.32%)	:arrow_up:
server/clip_server/model/trt_utils.py	83.51% <0.00%> (+27.47%)	:arrow_up:

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