remove the type of initalgraph

[YichengDWu]

Closes #36

[codecov]

Codecov Report

Merging #42 (c03f0e1) into main (57d4993) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #42   +/-   ##
=======================================
  Coverage   87.80%   87.80%           
=======================================
  Files           2        2           
  Lines         164      164           
=======================================
  Hits          144      144           
  Misses         20       20           

Impacted Files	Coverage Δ
src/layers.jl	87.50% <100.00%> (ø)

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