Corrected utilities.py

[chufangao]

In order to have the right model for pretrain.
This got changed in a previous commit, and should be changed back.

[codecov-io]

Codecov Report

Merging #44 (95adf6a) into master (e88c885) will decrease coverage by 0.84%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
- Coverage   53.18%   52.34%   -0.85%     
==========================================
  Files           7        7              
  Lines         831      831              
==========================================
- Hits          442      435       -7     
- Misses        389      396       +7     

Impacted Files	Coverage Δ
dsm/utilities.py	77.47% <100.00%> (-6.31%)	⬇️

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